SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K

[X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
	SECURITIES EXCHANGE ACT OF 1934 
	For the fiscal year ended December 31, 2005 or
( )   TRANSITION REPORT PERSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______ to _______

Commission file number        333-104061-01

BCTC IV ASSIGNOR CORP.(Exact name of registrant as specified in its charter)



|Delaware                          | _04-3208532____    
|--------------------------------- | -------------------
|(State or other jurisdiction      | (I.R.S. Employer   
|of incorporation or organization) | Identification No.)



One Boston Place, Suite 2100, Boston, Massachusetts  02108(Address of principal executive offices)           (Zip Code)

Registrant's telephone number, including area code (617)624-8900Securities registered pursuant to Section 12(b) of the Act:

| |                     | Name of each exchange
| | ------------------- | ---------------------
| | Title of each class | on which registered  
| |                     |                      
| | None                | None                 

Securities registered pursuant to Section 12(g) of the Act:

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.



|YES | X | NO | 
|--- | - | -- | 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer.  See definition of "accelerated filer and large accelerated filer" in Rule 12b-2 of the Exchange Act.

Large accelerated filer[  ]  Accelerated filer[  ]  Non-accelerated filer[ X ]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).



|YES | X | NO | 
|--- | - | -- | 



Indicate by check mark if disclosure of delinquent filers pursuant to 
Item 405 of Regulation S-K (229.405 of this chapter) is not contained 
herein, and will not be contained, to the best of registrant's knowledge, 
in definitive proxy or information statements incorporated by reference in 
Part III of this Form 10-K or any amendment to this Form 10-K.

__
|XX|

DOCUMENTS INCORPORATED BY REFERENCE

The following documents of the Fund are incorporated by reference:





|Form 10-K    |                                                                                                                                            
|------------ | -------------------------------------------------------------------------------------------------------------------------------------------
|Parts        | Document                                                                                                                                   
|             |                                                                                                                                            
|Parts I, III | Portions of the prospectus filed as a part of Registration Statement on Form S-11 which became effective December 16, 1993, as supplemented





BCTC IV ASSIGNOR CORP.

Form 10-K ANNUAL REPORT FOR THE YEAR ENDED DECEMBER 31, 2005



TABLE OF CONTENTS



PART I



|Item 1. | Business                                           
|------- | ---------------------------------------------------
|Item 2. | Properties                                         
|Item 3. | Legal Proceedings                                  
|Item 4. | Submission of Matters to a Vote of Security Holders
|        |                                                    



PART II

|Item 5.  | Market for Registrant's Common Equity, Related Stockholder Matters
|-------- | ------------------------------------------------------------------
|         |                                                                   
|Item 6.  | Selected Financial Data                                           
|Item 7.  | Management's Discussion and Analysis of Financial                 
|         |                                                                   
|Item 7A. | Quantitative and Qualitative Disclosures About Market Risk        
|Item 8.  | Financial Statements and Supplementary Data                       
|Item 9.  | Changes in and Disagreements with Accountants on                  
|         |                                                                   
|Item 9A. |                                                                   

PART III

|Item 10. | Directors and Executive Officers of the Assignor Limited Partner
|-------- | ----------------------------------------------------------------
|Item 11. | Executive Compensation                                          
|Item 12. | Security Ownership of Certain Beneficial Owners                 
|         |                                                                 
|Item 13. | Certain Relationships and Related Transactions                  
|Item 14. | Principal Accountant Fees and Services                          





PART IV

|Item 15. | Exhibits, Financial Statement Schedules,
|-------- | ----------------------------------------
|         |                                         
|         |                                         
|         | Signatures                              





PART I

Item 1.	Business

Organization

BCTC IV Assignor Corp,

Description of Business

The Assignor Limited Partner's sole purpose is to act as a conduit through which all of the economic and tax benefits of an investment in the Fund are passed along to the investor BAC Holders.  The Assignor Limited Partner does not charge any fees for its services and has no income.The Fund's principal business is to invest as a limited partner in other limited partnerships (the "Operating Partnerships") each of which will own or lease and will operate an Apartment Complex exclusively or partially for low- and moderate-income tenants.  Each Operating Partnership in which the Fund will invest will own Apartment Complexes which are completed, newly-constructed, under construction or rehabilitation, or to-be constructed or rehabilitated, and which are expected to receive Government Assistance.  Each Apartment Complex is expected to qualify for the low-income housing tax credit under Section 42 of the Code (the "Federal Housing Tax Credit"), thereby providing tax benefits over a period of ten to twelve years in the form of tax credits which investors may use to offset income, subject to certain strict limitations, from other sources.  Certain Apartment Complexes may also qualify for the historic rehabilitation tax credit under Section 47 of the Code (the "Rehabilitation Tax Credit").  The Federal Housing Tax Credit and the Government Assistance programs are described on pages 64 to 88 of the Prospectus, as supplemented, under the captions "Tax Credit Programs" and "Government Assistance Programs," which is incorporated herein by reference.  Section 236 (f) (ii) of the National Housing Act, as amended, in Section 101 of the Housing and Urban Development Act of 1965, as amended, each provide for the making by HUD of rent supplement payments to low income tenants in properties which receive other forms of federal assistance such as Tax Credits.  The payments for each tenant, which are made directly to the owner of their property, generally are in such amounts as to enable the tenant to pay rent equal to 30% of the adjusted family income.  Some of the Apartment Complexes in which the Partnership has invested are receiving such rent supplements from HUD.  HUD has been in the process of converting rent supplement assistance to assistance paid not to the owner of the Apartment Complex, but directly to the individuals.  At this time, the Partnership is unable to predict whether Congress will continue rent supplement programs payable directly to owners of the Apartment Complex.  
As of December 31, 2005, the Fund had invested in 23 Operating Partnerships on behalf of Series 20, 14 Operating Partnership on behalf of Series 21, 29 Operating Partnerships on behalf of Series 22, 22 Operating Partnerships on behalf of Series 23, 24 Operating Partnerships on behalf of Series 24, 22 Operating Partnerships on behalf of Series 25, 45 Operating Partnerships on behalf of Series 26, 16 Operating Partnerships on behalf of Series 27, 26 Operating Partnerships on behalf of Series 28, 22 Operating Partnerships on behalf of Series 29, 20 Operating Partnerships on behalf of Series 30, 27 Operating Partnerships on behalf of Series 31, 17 Operating Partnerships on behalf of Series 32, 10 Operating Partnerships on behalf of Series 33, 14 Operating Partnerships on behalf of Series 34, 11 Operating Partnerships on behalf of Series 35, 11 Operating Partnerships on behalf of Series 36, 7 Operating Partnerships on behalf of Series 37, 10 Operating Partnerships on behalf of Series 38, 9 Operating Partnerships on behalf of Series 39, 16 Operating Partnerships on behalf of Series 40, 23 Operating Partnerships on behalf of Series 41, 22 Operating Partnerships on behalf of Series 42, 22 Operating Partnerships on behalf of Series 43, 10 Operating Partnerships on behalf of Series 44, 31 Operating Partnerships on behalf of Series 45 and 14 Operating Partnerships on behalf of Series 46.

|The business objectives of the Fund are to:
|-------------------------------------------
|(1)                                        
|(2)                                        
|(3)                                        
|(4)                                        



The business objectives and investment policies of the Fund are described more fully on pages 49 to 61 of the Prospectus, as supplemented, under the caption "Investment Objectives and Acquisition Policies," which is incorporated herein by reference.

EmployeesThe Assignor Limited Partner does not have any employees and does not perform any services.

Item 2.	Properties

The Assignor Limited Partner has no properties.
Item 3.	Legal Proceedings



None

Item 4.	Submission of Matters to a Vote of Security Holders



None

PART II

|Item | 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
|---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                             
|     | (a)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Market Information                                                                                          
|     | The Assignor Limited Partner is a corporation with 1000 shares of common stock, all of which are owned by John Manning.  There will not be any established public trading market for the shares as they have not been registered under the Securities Act of 1933.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                             
|     | (b)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Approximate number of security holders                                                                      
|     | As of December 31, 2005, the Assignor Limited Partner has 43,274 BAC holders for an aggregate of 83,651,080 BACs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|     | The BACs were issued in series.  Series 20 consists of 2,341
investors holding 3,866,700 BACs, Series 21 consists of 1,181
investors holding 1,892,700 BACs, Series 22 consists of 1,633
investors holding 2,564,400 BACs, Series 23 consists of 2,101
investors holding 3,336,727 BACs, Series 24 consists of 1,297
investors holding 2,169,878 BACs, Series 25 consists of 1,784
investors holding 3,026,109 BACs, Series 26 consists of 2,307
investors holding 3,995,900 BACs, Series 27 consists of 1,335
investors holding 2,460,700 BACs, Series 28 consists of 2,045
investors holding 4,000,738 BACs, Series 29 consists of 2,236
investors holding 3,991,800 BACs, Series 30 consists of 1,358
investors holding 2,651,000 BACs, Series 31 consists of 2,110
investors holding 4,417,857 BACs, Series 32 consists of 2,323
investors holding 4,754,198 BACs, Series 33 consists of 1,276
investors holding 2,636,533 BACs, Series 34 consists of 1,723
investors holding 3,529,319 BACs, Series 35 consists of 1,687
investors holding 3,300,463 BACs, Series 36 consists of 1,013
investors holding 2,106,837 BACs, Series 37 consists of 1,142
investors holding 2,512,500 BACs, Series 38 consists of 1,214
investors holding 2,543,100 BACs, Series 39 consists of 1,001
investors holding 2,292,152 BACs, Series 40 consists of 1,116
investors holding 2,630,256 BACs, Series 41 consists of 1,448
investors holding 2,891,626 BACs, Series 42 consists of 1,283
investors holding 2,744,262 BACs, Series 43 consists of 1,708
investors holding 3,637,987 BACs, Series 44 consists of 1,317
investors holding 2,701,973 BACs, Series 45 consists of 1,851 investors holding 4,014,367 BACs and Series 46 consists of 1,444 investors holding 2,980,998 BACS at December 31, 2005.
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                             
|     | (c)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Dividend history and restriction                                                                            
|     | The Assignor Limited Partner has no revenues and there will be no distributions of dividends.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

Item 6.	Selected Financial Data

The Assignor Limited Partner has no operational history.



|Item 7. | Management's Discussion and Analysis of Financial
|------- | -------------------------------------------------
|        | Condition and Results of Operations              

The Assignor Limited Partner has no operational history and capital needs.

|Item 7A. | Quantitative and Qualitative Disclosure About Market Risk                                                 
|-------- | ----------------------------------------------------------------------------------------------------------
|         |                                                                                                           
|         | Not Applicable                                                                                            
|         |                                                                                                           
|Item 8.  | Financial Statements and Supplementary Data                                                               
|         |                                                                                                           
|         | The information required by this item is contained in Part IV, Item 15 of this Annual Report on Form 10-K.
|         |                                                                                                           
|Item 9.  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure                      
|         |                                                                                                           
|         | None                                                                                                      
|         |                                                                                                           
|Item 9A. | Controls and Procedures                                                                                   
|         |                                                                                                           
|         | (a)  Evaluation of Disclosure Controls and Procedures                                                     
|         |                                                                                                           
|         | None                                                                                                      
|         |                                                                                                           
|         | (b)  Changes in Internal Controls                                                                         
|         |                                                                                                           
|         | None                                                                                                      

PART III

|Item 10. | Directors and Executive Officers of the Registrant
|-------- | --------------------------------------------------
|         |                                                   
|         | (a), (b), (c), (d) and (e)                        

The Assignor Limited Partner's sole shareholder and director is:

John P. Manning, age 57, is co-founder, and since 1974 has been the President and Chief Executive Officer of Boston Capital Corporation, the general partner of Boston Capital Holdings Limited Partnership (''Boston Capital'') which owns 100% of our advisor and 66.66% of the dealer-manager. As founding CEO of Boston Capital Corporation, Mr. Manning's primary responsibilities include strategic planning, business development and the continued oversight of new opportunities. In addition to his responsibilities at Boston Capital, Mr. Manning is a proactive leader in the multifamily real estate industry. He served in 1989 as a member of the Mitchell-Danforth Task Force, which reviewed and suggested reforms to the Low Income Housing Tax Credit program. He was the founding President of the Affordable Housing Tax Credit Coalition and is a former member of the board of the National Leased Housing Association. From 1992-1993 he served as a member of the Massachusetts Housing Policy Committee as an appointee of the Governor of Massachusetts. In addition, Mr. Manning has testified before the U.S. House Ways and Means Committee and the U.S. Senate Finance Committee on the critical role of the private sector in the success of the Low Income Housing Tax Credit. In 1994, President Clinton appointed him to the President's Advisory Committee on the Arts at the John F. Kennedy Center for the Performing Arts. In 1998, President Clinton appointed Mr. Manning to the President's Export Council, the premier committee comprised of major corporate CEOs that advise the President in matters of foreign trade and commerce. In 2003, Mr. Manning was appointed by Boston Mayor Tom Menino to the Mayor's Advisory Panel on Housing. Mr. Manning sits on the Board of Directors of the John F. Kennedy Presidential Library in Boston, where he serves as Chairman of the Distinguished Visitors Program. He also serves on the Board of Directors of the Beth Israel Deaconess Medical Center in Boston. Mr. Manning is a graduate of Boston College.

Marc N. Teal, age 42, has been Senior Vice President and Chief Financial Officer of Boston Capital Corporation since May 2003. Mr. Teal previously served as Senior Vice President and Director of Accounting and prior to that served as Vice President of Partnership Accounting. In his current role as Chief Financial Officer, he oversees all of the accounting, financial reporting, SEC reporting, budgeting, audit, tax and compliance for Boston Capital, its affiliated entities and all Boston Capital sponsored programs. Additionally, Mr. Teal is responsible for maintaining all banking and borrowing relationships of Boston Capital Corporation and treasury management of all working capital reserves.  He also oversees Boston Capital's information and technology areas, including the strategic planning.  Mr. Teal has more than 18 years of finance and accounting experience. Prior to joining Boston Capital in 1990, Mr. Teal was a Senior Accountant for Cabot, Cabot & Forbes, a multifaceted real estate company, and prior to that was a Senior Accountant for Liberty Real Estate Corp. He received a Bachelor of Science in Accountancy from Bentley College and received a Masters in Finance from Suffolk University.



|(f)         | Involvement in certain legal proceedings.                                                                                                                                                                                                                                                                                                                            
|----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|            |                                                                                                                                                                                                                                                                                                                                                                      
|            | None                                                                                                                                                                                                                                                                                                                                                                 
|            |                                                                                                                                                                                                                                                                                                                                                                      
|(g)         | Promoters and control persons.                                                                                                                                                                                                                                                                                                                                       
|            |                                                                                                                                                                                                                                                                                                                                                                      
|            | None                                                                                                                                                                                                                                                                                                                                                                 
|            |                                                                                                                                                                                                                                                                                                                                                                      
|(h) and (i) | John P. Manning is the registrant's sole shareholder, principal executive officer and director and accordingly the registrant has no audit committee or audit committee financial committee expert and has not adopted a code of ethics.  The registrant is not a listed issuer as defined in Regulation 10A-3 promulgated under the Securities Exchange Act of 1934.
|            |                                                                                                                                                                                                                                                                                                                                                                      
|Item 11.    | Executive Compensation                                                                                                                                                                                                                                                                                                                                               
|            | (a), (b), (c), (d) and (e)
None                                                                                                                                                                                                                                                                                                                                      

|Item 12. | Security Ownership of Certain Beneficial Owners and Management                                                                                                                                                                                                                                                                                                                                        
|-------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|(a)      | Security ownership of certain beneficial owners.                                                                                                                                                                                                                                                                                                                                                      
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | As of December 31, 2005, 83,651,080 BACs had been issued.  The following series are known to have one investor with holdings in excess of 5% of the total outstanding BACs in the series:

Series 20  6.88%
Series 21  5.37%
Series 22  8.24%
Series 23  6.50%
Series 24  6.54%
Series 25  5.84%
Series 26  7.46%
Series 27  8.31%
Series 28  6.98%
Series 29  5.87%
Series 30  6.20%
Series 32  5.54%
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | (b)                                                                                                                                                                                                                                                                                                                                                                                                   
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | (c)                                                                                                                                                                                                                                                                                                                                                                                                   
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|Item 13. |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | (a)                                                                                                                                                                                                                                                                                                                                                                                                   
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | (b)                                                                                                                                                                                                                                                                                                                                                                                                   
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | (c)                                                                                                                                                                                                                                                                                                                                                                                                   
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         | (d)                                                                                                                                                                                                                                                                                                                                                                                                   
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|Item 14. |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       
|         |                                                                                                                                                                                                                                                                                                                                                                                                       





























PART IV

|Item 15.  | Exhibits, Financial Statement Schedules, and Reports on Form 8-K                                                                                                                                
|--------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|          |                                                                                                                                                                                                 
|(a) 1 & 2 | Financial Statements and Financial Statement Schedules; Filed herein as Exhibits 13                                                                                                             
|          |                                                                                                                                                                                                 
|          | BCTC IV Assignor Corp.; filed herein as Exhibit 13                                                                                                                                              
|          | Report of Independent Registered Public Accounting Firm                                                                                                                                         
|          |                                                                                                                                                                                                 
|          | Balance Sheet, December 31, 2005                                                                                                                                                                
|          |                                                                                                                                                                                                 
|          | Notes to Balance Sheet, December 31, 2005                                                                                                                                                       
|          |                                                                                                                                                                                                 
|          | Schedules not listed are omitted because of the absence of the conditions under which they are required or because the information is included in the financial statements or the notes thereto.
|          |                                                                                                                                                                                                 
|(b) 1     | Reports on Form 8-K                                                                                                                                                                             
|          |                                                                                                                                                                                                 
|          | None                                                                                                                                                                                            

|(c) 1 | Exhibits (listed according to the number assigned in the table in Item 601 of Regulation S-K)
|----- | ---------------------------------------------------------------------------------------------

Exhibit No. 3 - Organization Documents.  
	a.	Articles of Incorporation of BCTC IV Assignor Corp.
		 (Incorporated by reference from Exhibit 3 to the 
		Fund's Registration Statement No. 33-70564 on Form S-11 as 
		filed with the Securities and Exchange Commission on October 19,
		1993.)  
	Exhibit No. 10 - Material contracts.  
	a.	Beneficial Assignee Certificate.  (Incorporated by reference from
		Exhibit 10A to the Fund's Registration Statement No. 33-70564 on
		Form S-11 as filed with the Securities and Exchange Commission on
		October 19, 1993)
	Exhibit No. 13 - Financial Statements.

a.	Audited Financial Statement of BCTC IV Assignor Corp. filed herein.
	Exhibit No. 28 - Additional exhibits.
	None



















|Exhibit No. 31 Certification 302                                                                                         
|-------------------------------------------------------------------------------------------------------------------------
|                                                                                                                         
|Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herein                                    
|                                                                                                                         
|Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herein                                    
|                                                                                                                         
|Exhibit No. 32 Certification 906                                                                                         
|Certification pursuant to 18 U.S.C. Section 1350, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herein
|                                                                                                                         
|Certification pursuant to 18 U.S.C. Section 1350, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herein

SIGNATURES

Pursuant to the requirements of Section 13 of the Securities Exchange
Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

|                      |  | BCTC IV Assignor Corp.
|--------------------- |  | ----------------------
|                      |  |                       
|Date:  March 31, 2006 |  | By:                   
|                      |  |                       
|                      |  |                       

Pursuant to the requirements of the Securities Exchange Act of 1934,
this report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated:

|DATE:          | SIGNATURE:          | TITLE:                                                                   
|-------------- | ------------------- | -------------------------------------------------------------------------
|               |                     |                                                                          
|March 31, 2006 | /s/ John P. Manning | Director, President (Principal Executive Officer), BCTC IV Assignor Corp.
|               | John P. Manning    
|               |                    
|               |                    
|               |                    



|DATE:          | SIGNATURE:       | TITLE:                                               
|-------------- | ---------------- | -----------------------------------------------------
|               |                  |                                                      
|March 31, 2006 | /s/ Marc N. Teal | (Principal Financial Officer), BCTC IV Assignor Corp.
|               | Marc N. Teal    
|               |                 
|               |                 
|               |