UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 10-K

(Mark One)
|X| ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT
OF 1934 For the fiscal year ended: December 31, 2006
                                       or
|_| TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
  SECURITIES EXCHANGE ACT OF 1934
For Transition period ______________________________


             Commission File Number of issuing entity: 333-126732-22
                           RALI SERIES 2006-QS1 TRUST
           (Exact name of issuing entity as specified in its charter)

                        RESIDENTIAL ACCREDIT LOANS, INC.
              (Exact name of depositor as specified in its charter)

                        RESIDENTIAL FUNDING COMPANY, LLC
               (Exact name of sponsor as specified in its charter)

                                    New York
        (State or other jurisdiction of incorporation or organization of
                               the issuing entity)

            c/o Residential Funding Company, LLC, as Master Servicer
                         8400 Normandale Lake Boulevard
                          Minneapolis, Minnesota 55437
           (Address of principal executive offices of issuing entity)

             (952) 857-7000 (Telephone number, including area code)

                                      None
                      (I.R.S. Employer Identification No.)

                                       N/A
           (Former name, former address, if changed since last report)

Securities  registered  pursuant to Section  12(b) of the Act:  None  Securities
Registered  pursuant to Section 12(g) of the Act: None Indicate by check mark if
the registrant is a well-known  seasoned  issuer,  as defined in Rule 405 of the
Securities Act.
Yes |_|  No  |X|
Indicate  by  check  mark if the  registrant  is not  required  to file  reports
pursuant to Section 13 or Section 15(d) of the Act.

<PAGE>

Yes |X|  No  |_|
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.
|X| Yes         |_| No
Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K 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 II of the Form 10-K or any  amendment to this
Form 10-K. |X| [Item 405 of Regulation S-K is not applicable.] 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.  (Check  one):  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 Act). Yes |_| No |X| Registrant has no voting or non-voting  common
equity outstanding held by non-affiliates.


<PAGE>


                                     PART I

THE FOLLOWING ITEMS HAVE BEEN OMITTED IN ACCORDANCE  WITH GENERAL  INSTRUCTION J
TO FORM 10-K:

Item 1: Business.
Item 1A: Risk Factors.
Item 2: Properties.
Item 3: Legal Proceedings.
Item 4: Submission of Matters to a Vote of Security Holders.

ITEM 1B. UNRESOLVED STAFF COMMENTS.

Not Applicable.

SUBSTITUTE INFORMATION PROVIDED IN ACCORDANCE WITH GENERAL INSTRUCTION J TO FORM
10-K:

ITEM 1112(B) OF REGULATION AB. SIGNIFICANT OBLIGORS OF POOL
ASSETS (FINANCIAL INFORMATION).

None.

ITEM 1114(B)(2) OF REGULATION AB: CREDIT ENHANCEMENT AND OTHER
SUPPORT, EXCEPT FOR CERTAIN DERIVATIVES INSTRUMENTS (FINANCIAL
INFORMATION).

None.

ITEM 1115(B) OF REGULATION AB: CERTAIN DERIVATIVES INSTRUMENTS
(FINANCIAL INFORMATION).

Based  on the  standards  set  forth  in  Item  1115(b)  of  Regulation  AB,  no
information is required in response to this Item.

ITEM 1117 OF REGULATION AB: LEGAL PROCEEDINGS.

There are no material pending legal or other proceedings  involving the mortgage
loans or Residential Funding Company,  LLC ("Residential  Funding"),  as sponsor
and master servicer, Residential Accredit Loans, Inc., as depositor, RALI Series
2006-QS1   Trust,   as  the   issuing   entity,   Homecomings   Financial,   LLC
("Homecomings")  and GMAC Mortgage,  LLC ("GMACM"),  as  subservicers,  or other
parties  described in Item 1117 of  Regulation AB that,  individually  or in the
aggregate,  would have a material  adverse impact on investors in the securities
(the "Securities") to which this report relates.


<PAGE>

Residential  Funding,  Homecomings  and GMACM are  currently  parties to various
legal  proceedings  arising  from time to time in the  ordinary  course of their
businesses,  some of which  purport to be class  actions.  Based on  information
currently available,  it is the opinion of Residential Funding,  Homecomings and
GMACM that the  eventual  outcome of any  currently  pending  legal  proceeding,
individually  or in the  aggregate,  will not have a material  adverse effect on
their ability to perform their obligations in relation to the mortgage loans. No
assurance,  however,  can be  given  that  the  final  outcome  of  these  legal
proceedings, if unfavorable,  either individually or in the aggregate, would not
have a material adverse impact on Residential Funding, Homecomings or GMACM. Any
such  unfavorable  outcome  could  adversely  affect the ability of  Residential
Funding,  Homecomings  or GMACM to perform its servicing  duties with respect to
the  mortgage  loans and  potentially  lead to the  replacement  of  Residential
Funding, Homecomings or GMACM with a successor servicer.


                                     PART II

THE FOLLOWING ITEMS HAVE BEEN OMITTED IN ACCORDANCE  WITH GENERAL  INSTRUCTION J
TO FORM 10-K:

Item 5: Market for Registrant's Common Equity, Related
        Stockholder Matters and Issuer Purchases of Equity
        Securities.
Item 6: Selected Financial Data.
Item 7: Management's Discussion and Analysis of Financial
        Condition and Results of Operations.
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
        Accounting and Financial Disclosure.
Item 9A:   Controls and Procedures.

ITEM 9B: OTHER INFORMATION.

None.

                                    PART III

THE FOLLOWING ITEMS HAVE BEEN OMITTED IN ACCORDANCE  WITH GENERAL  INSTRUCTION J
TO FORM 10-K:

Item 10: Directors and Executive Officers of the Registrant.
Item 11: Executive Compensation.
Item 12: Security Ownership of Certain Beneficial Owners and
         Management and Related Stockholder Matters.
Item 13: Certain Relationships and Related Transactions.
Item 14: Principal Accountant Fees and Services.


<PAGE>

SUBSTITUTE INFORMATION PROVIDED IN ACCORDANCE WITH GENERAL INSTRUCTION J TO FORM
10-K:

ITEM 1119 OF REGULATION AB:  AFFILIATIONS AND CERTAIN
RELATIONSHIPS AND RELATED TRANSACTIONS.

Information  contemplated  by Item 1119 of  Regulation  AB has been omitted from
this report in reliance on the Instruction to Item 1119.

ITEM 1122 OF REGULATION AB: COMPLIANCE WITH APPLICABLE SERVICING
CRITERIA.

Each of Residential  Funding  Company,  LLC,  Homecomings  Financial,  LLC, HSBC
Mortgage Corporation (USA), First American Real Estate Solutions of Texas, L.P.,
National  City  Mortgage  Co.,  Regulus  Group LLC,  Deutsche Bank Trust Company
Americas  and  Wells  Fargo  Bank,  National  Association  (each,  a  "Servicing
Participant") has been identified by the registrant as a party  participating in
the  servicing  function  with  respect to the pool  assets  held by the Issuing
Entity.  Each Servicing  Participant  has completed a report on an assessment of
compliance with the servicing criteria applicable to such Servicing  Participant
(each,  a "Report on  Assessment")  as of  December  31, 2006 and for the period
covered by this Form 10-K,  which Reports on Assessment are attached as exhibits
to this Form 10-K.  In  addition,  each  Servicing  Participant  has provided an
attestation report (each, an "Attestation  Report") by a registered  independent
public  accounting  firm  regarding  its  related  Report  on  Assessment.  Each
Attestation Report is attached as an exhibit to this Form 10-K.

A Servicing  Participant may engage one or more vendors to perform  specific and
limited,  or scripted  activities  that  address all or a portion of one or more
servicing criteria applicable to such Servicing Participant. In general in these
cases,  the Servicing  Participant  has  instituted  policies and  procedures to
monitor whether such vendors'  activities  comply in all material  respects with
such  servicing  criteria,  and may elect to take  responsibility  for assessing
compliance with the servicing criteria applicable to such vendors' activities in
such  Servicing   Participant's  Report  on  Assessment.   Where  the  Servicing
Participant  has not  instituted  such  policies  and  procedures,  or where the
Servicing  Participant  does  not  otherwise  elect to take  responsibility  for
assessing its vendors'  activities,  the vendor is itself treated as a Servicing
Participant  and is required to provide its own Report on Assessment and related
Attestation Report.

Except as disclosed below, no Report on Assessment or related Attestation Report
has identified  (i) any material  instance of  noncompliance  with the servicing
criteria  identified  in such Report on  Assessment as applicable to the related
Servicing  Participant  or  (ii)  any  material  deficiency  in  such  Servicing
Participant's policies and procedures to monitor vendor compliance.

Exceptions:

Residential  Funding  Company,   LLC:  The  Report  on  Assessment  prepared  by
Residential  Funding  Company,  LLC  and the  related  Attestation  Report  have
identified material noncompliance with one servicing criterion applicable to it.
Specifically,   with  regard  to  servicing  criterion  1122(d)(3)(i)(B)  (which
contemplates  that  reports  to  investors  provide  information  calculated  in
accordance with the terms specified in the transaction agreements),  information
required  by the  transaction  agreements  was  excluded  from,  or  incorrectly
reported in, certain of the investor  reports.  The registrant  does not believe
these  reporting  errors had any material  impacts or effects on  investors  and
corrective action was completed to address ongoing compliance.


<PAGE>

First  American Real Estate  Solutions of Texas,  L.P.: The Report on Assessment
prepared  by First  American  Real  Estate  Solutions  of  Texas,  L.P.  ("First
American") and the related Attestation Report have identified material instances
of noncompliance with one servicing  criterion  applicable to it.  Specifically,
with regard to servicing criterion  1122(d)(2)(vii)(B),  which contemplates that
reconciliations are prepared on a monthly basis for all asset-backed  securities
related bank  accounts,  First  American  did not prepare  such  reconciliations
within 30  calendar  days after the bank  statement  cut-off  date or such other
number of days specified in the related transaction agreements.

National City  Mortgage Co.: The Report on Assessment  prepared by National City
Mortgage Co. ("NCM") and the related Attestation Report have identified material
instances  of  noncompliance  with  one  servicing  criteria  applicable  to it.
Specifically,   with  regard  to  servicing  criterion  1122(d)(3)(i)(A)  (which
contemplates   that  reports  to  investors  are  prepared  in  accordance  with
timeframes and other terms set forth in the transaction  agreements),  instances
were noted (NCM indicates 29 possible  instances) in which NCM failed to provide
the  master  servicer  with  delinquency/default  loan data  reports  within the
timeframes or otherwise as set forth in the transaction agreements.

Platform-Level Reports:

Regulations of the Securities and Exchange  Commission  (the "SEC") require that
each  Servicing  Participant  complete a Report on  Assessment  at a  "platform"
level,  meaning that the transactions covered by the Report on Assessment should
include  all  asset-backed  securities  transactions  involving  such  Servicing
Participant  that are backed by the same asset type.  More recent  guidance from
the SEC staff identifies additional parameters which a Servicing Participant may
apply to define  and  further  limit its  platform.  For  example,  a  Servicing
Participant  may define its  platform  to include  only  transactions  that were
completed  on or after  January  1, 2006 and that were  registered  with the SEC
pursuant  to  the  Securities  Act  of  1933.  Each  Servicing   Participant  is
responsible  for defining its own platform,  and each  platform  will  naturally
differ based on various factors,  including the Servicing Participant's business
model and the transactions in which it is involved.

Based on our understanding of their platforms and the guidance that is available
at this time, we believe that the parameters by which the Servicing Participants
have defined their platforms should be permissible.  However,  because the SEC's
regulations  are new and the guidance  that is available at this time is subject
to clarification or change, we cannot assure you that the SEC and its staff will
necessarily agree.

ITEM 1123 OF REGULATION AB: SERVICER COMPLIANCE STATEMENT.

Each of  Residential  Funding  Company,  LLC, GMAC  Mortgage,  LLC,  Homecomings
Financial,  LLC and National  City Mortgage Co.  (each,  a "Servicer")  has been
identified by the  registrant as a servicer with respect to the pool assets held
by the Issuing Entity. Each Servicer has provided a statement of compliance with
its  obligations  under  servicing  agreement  applicable  to such  Servicer  (a
"Compliance  Statement")  for the period covered by this Form 10-K, in each case
signed  by an  authorized  officer  of the  related  servicer.  Each  Compliance
Statement  is attached as an exhibit to this Form 10-K.  None of the  Compliance
Statements has identified any instance where the related  Servicer has failed to
fulfill its obligations under the applicable servicing agreement in any material
respects.


                                     PART IV

ITEM 15.   EXHIBITS, FINANCIAL STATEMENT SCHEDULES.

      (a)(1) Not Applicable.

      (a)(2) Not Applicable.

      (a)(3) Not Applicable.

      (b) Exhibits.


<PAGE>

EXHIBIT
NUMBER                           DESCRIPTION
---------  ---------------------------------------------------------
3.1        Certificate of  Incorporation  of  Residential  Accredit  Loans,  Inc
           (incorporated  by reference to the Annual Report on Form 10-K for the
           period ended December 31, 2006,  filed by RALI Series  2006-QA1 Trust
           with the Securities and Exchange Commission).
3.2        Bylaws of Residential  Accredit Loans, Inc (incorporated by reference
           to the Annual  Report on Form 10-K for the period ended  December 31,
           2006,  filed by RALI Series  2006-QA1  Trust with the  Securities and
           Exchange Commission).
10.1       Series Supplement, dated as of  January 1, 2006, and
           the Standard Terms of Pooling and Servicing Agreement,
           dated as of January 1, 2006, among Residential Accredit
           Loans, Inc., as company, Residential Funding Company,
           LLC (formerly Residential Funding Corporation), as
           master servicer, and Deutsche Bank Trust Company
           Americas, as trustee (incorporated by reference to the
           Report on Form 8-K filed by the Issuing Entity with the
           Securities and Exchange Commission on February 14,
           2006).
10.2       Assignment  and Assumption  Agreement,  dated as of January 30, 2006,
           between  Residential  Funding  Company,  LLC  (formerly   Residential
           Funding   Corporation)   and   Residential   Accredit   Loans,   Inc.
           (incorporated  by  reference  to the  Report on Form 8-K filed by the
           Issuing  Entity  with  the  Securities  and  Exchange  Commission  on
           February 14, 2006).
31.1       Certification of Residential  Funding  Company,  LLC pursuant to Rule
           13a-14(d)/15d-14(d) under the Securities Exchange Act of 1934.
33.1       Report  on  Assessment  of  Compliance  with  Servicing  Criteria  of
           Residential Funding Company,  LLC as of December 31, 2006 and for the
           period covered by this Form 10-K.
33.2       Report  on  Assessment  of  Compliance  with  Servicing  Criteria  of
           Homecomings Financial, LLC as of December 31, 2006 and for the period
           covered by this Form 10-K.
33.3.1     Report on Assessment of Compliance  with  Servicing  Criteria of HSBC
           Mortgage Corporation (USA) as of December 31, 2006 and for the period
           covered by this Form 10-K.
33.3.2     Report on Assessment of Compliance  with Servicing  Criteria of First
           American Real Estate Solutions of Texas, L.P. as of December 31, 2006
           and for the period covered by this Form 10-K.
33.4.1     Report on Assessment of Compliance with Servicing
           Criteria of National City Mortgage Co. as of December
           31, 2006 and for the period covered by this Form 10-K.
33.4.2     Report on Assessment of Compliance with Servicing Criteria of Regulus
           Group LLC as of December 31, 2006 and for the period  covered by this
           Form 10-K.
33.5       Report  on  Assessment  of  Compliance  with  Servicing  Criteria  of
           Deutsche Bank Trust Company  Americas as of December 31, 2006 and for
           the period covered by this Form 10-K.
33.6       Report on Assessment of Compliance  with Servicing  Criteria of Wells
           Fargo Bank, National  Association as of December 31, 2006 and for the
           period covered by this Form 10-K.
34.1       Attestation  Report of  PricewaterhouseCoopers  LLP on  Assessment of
           Compliance with Servicing  Criteria  relating to Residential  Funding
           Company, LLC.
34.2       Attestation  Report of  PricewaterhouseCoopers  LLP on  Assessment of
           Compliance with Servicing Criteria relating to Homecomings Financial,
           LLC.
34.3.1     Attestation  Report  of KPMG LLP on  Assessment  of  Compliance  with
           Servicing Criteria relating to HSBC Mortgage Corporation (USA).
34.3.2     Attestation Report of PricewaterhouseCoopers LLP on
           Assessment of Compliance with Servicing Criteria
           relating to First American Real Estate Solutions of
           Texas, L.P.
34.4.1     Attestation Report of Ernst & Young, LLP on Assessment
           of Compliance with Servicing Criteria relating to
           National City Mortgage Co.
34.4.2     Attestation  Report  of KPMG LLP on  Assessment  of  Compliance  with
           Servicing Criteria relating to Regulus Group LLC.
34.5       Attestation Report of KPMG LLP on Assessment of
           Compliance with Servicing Criteria relating to Deutsche
           Bank Trust Company Americas.
34.6       Attestation Report of KPMG LLP on Assessment of
           Compliance with Servicing Criteria relating to Wells
           Fargo Bank, National Association.
35.1       Servicer Compliance Statement of Residential Funding
           Company, LLC.
35.2       Servicer Compliance Statement of GMAC Mortgage, LLC.
35.3       Servicer Compliance Statement of Homecomings Financial,
           LLC.
35.4       Servicer Compliance Statement of National City Mortgage
           Co.


      (c) Not Applicable.



<PAGE>



                                   SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) 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.

Date:  March 26, 2007
                                   RALI SERIES 2006-QS1 TRUST

                                   By:  Residential Funding
                                      Company, LLC,
                                        as Master Servicer

                                        By:  /s/ Anthony N. Renzi
                                           Name: Anthony N. Renzi
                                           Title:   Managing Director



<PAGE>


                                INDEX TO EXHIBITS
EXHIBIT
NUMBER                           DESCRIPTION
---------  ---------------------------------------------------------
3.1        Certificate of  Incorporation  of  Residential  Accredit  Loans,  Inc
           (incorporated  by reference to the Annual Report on Form 10-K for the
           period ended December 31, 2006,  filed by RALI Series  2006-QA1 Trust
           with the Securities and Exchange Commission).
3.2        Bylaws of Residential  Accredit Loans, Inc (incorporated by reference
           to the Annual  Report on Form 10-K for the period ended  December 31,
           2006,  filed by RALI Series  2006-QA1  Trust with the  Securities and
           Exchange Commission).
10.1       Series Supplement, dated as of  January 1, 2006, and
           the Standard Terms of Pooling and Servicing Agreement,
           dated as of January 1, 2006, among Residential Accredit
           Loans, Inc., as company, Residential Funding Company,
           LLC (formerly Residential Funding Corporation), as
           master servicer, and Deutsche Bank Trust Company
           Americas, as trustee (incorporated by reference to the
           Report on Form 8-K filed by the Issuing Entity with the
           Securities and Exchange Commission on February 14,
           2006).
10.2       Assignment  and Assumption  Agreement,  dated as of January 30, 2006,
           between  Residential  Funding  Company,  LLC  (formerly   Residential
           Funding   Corporation)   and   Residential   Accredit   Loans,   Inc.
           (incorporated  by  reference  to the  Report on Form 8-K filed by the
           Issuing  Entity  with  the  Securities  and  Exchange  Commission  on
           February 14, 2006).
31.1       Certification of Residential  Funding  Company,  LLC pursuant to Rule
           13a-14(d)/15d-14(d) under the Securities Exchange Act of 1934.
33.1       Report  on  Assessment  of  Compliance  with  Servicing  Criteria  of
           Residential Funding Company,  LLC as of December 31, 2006 and for the
           period covered by this Form 10-K.
33.2       Report  on  Assessment  of  Compliance  with  Servicing  Criteria  of
           Homecomings Financial, LLC as of December 31, 2006 and for the period
           covered by this Form 10-K.
33.3.1     Report on Assessment of Compliance  with  Servicing  Criteria of HSBC
           Mortgage Corporation (USA) as of December 31, 2006 and for the period
           covered by this Form 10-K.
33.3.2     Report on Assessment of Compliance  with Servicing  Criteria of First
           American Real Estate Solutions of Texas, L.P. as of December 31, 2006
           and for the period covered by this Form 10-K.
33.4.1     Report on Assessment of Compliance with Servicing
           Criteria of National City Mortgage Co. as of December
           31, 2006 and for the period covered by this Form 10-K.
33.4.2     Report on Assessment of Compliance with Servicing Criteria of Regulus
           Group LLC as of December 31, 2006 and for the period  covered by this
           Form 10-K.
33.5       Report  on  Assessment  of  Compliance  with  Servicing  Criteria  of
           Deutsche Bank Trust Company  Americas as of December 31, 2006 and for
           the period covered by this Form 10-K.
33.6       Report on Assessment of Compliance  with Servicing  Criteria of Wells
           Fargo Bank, National  Association as of December 31, 2006 and for the
           period covered by this Form 10-K.
34.1       Attestation  Report of  PricewaterhouseCoopers  LLP on  Assessment of
           Compliance with Servicing  Criteria  relating to Residential  Funding
           Company, LLC.
34.2       Attestation  Report of  PricewaterhouseCoopers  LLP on  Assessment of
           Compliance with Servicing Criteria relating to Homecomings Financial,
           LLC.
34.3.1     Attestation  Report  of KPMG LLP on  Assessment  of  Compliance  with
           Servicing Criteria relating to HSBC Mortgage Corporation (USA).
34.3.2     Attestation Report of PricewaterhouseCoopers LLP on
           Assessment of Compliance with Servicing Criteria
           relating to First American Real Estate Solutions of
           Texas, L.P.
34.4.1     Attestation Report of Ernst & Young, LLP on Assessment
           of Compliance with Servicing Criteria relating to
           National City Mortgage Co.
34.4.2     Attestation  Report  of KPMG LLP on  Assessment  of  Compliance  with
           Servicing Criteria relating to Regulus Group LLC.
34.5       Attestation Report of KPMG LLP on Assessment of
           Compliance with Servicing Criteria relating to Deutsche
           Bank Trust Company Americas.
34.6       Attestation Report of KPMG LLP on Assessment of
           Compliance with Servicing Criteria relating to Wells
           Fargo Bank, National Association.
35.1       Servicer Compliance Statement of Residential Funding
           Company, LLC.
35.2       Servicer Compliance Statement of GMAC Mortgage, LLC.
35.3       Servicer Compliance Statement of Homecomings Financial,
           LLC.
35.4       Servicer Compliance Statement of National City Mortgage
           Co.