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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 10-K
 ANNUAL REPORT
PURSUANT TO SECTIONS 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
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    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
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    TRANSITION REPORT PURSUANT TO SECTION 13
OR 15(d) OF THESECURITIES EXCHANGE ACT
OF 1934
 For the transition period from to
 Commission file number 333-110499-139
 Principal Life Income Fundings Trust 2005-45
 (by Principal Life Insurance Company as depositor)
  Iowa
(State or other jurisdiction of
incorporation or organization)
    
    42-0127290
(I.R.S. Employer Identification No.)
 Principal Life Income Fundings Trust 2005-45
c/o Principal Life Insurance Company, as depositor
711 High Street
Des Moines, Iowa 50392-0001
(515) 247-5111
 (515) 247-5111
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##### Table of Contents



PART I
 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 and Issuer Purchases of
Equity Securities.
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PART III
 Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder
Matters.
  Item 13. Certain Relationships and Related Transactions.
  PART IV
 Item 15. Exhibits, Financial Statement Schedules, and Reports on Form 8-K.
 Exhibit 31.1
    
    Section 302 Certification.Exhibit 99.1
    
    Indenture Trustee Reports of the Trust  Incorporated herein by
reference to Exhibit 99.1 to the Current Report(s) on Form 8-K filed
by Principal Life Insurance Company on behalf of Principal Life
Income Fundings Trust 2005-45 on June 29, 2005, and to the Current
Report(s) on Form 8-K filed by Principal Life Insurance Company on
behalf of Principal Life Income Fundings Trust 2005-45 on July 27,
2005, and to the Current Report(s) on Form 8-K filed by Principal
Life Insurance Company on behalf of Principal Life Income Fundings
Trust 2005-45 on August 26, 2005, and to the Current Report(s) on
Form 8-K filed by Principal Life Insurance Company on behalf of
Principal Life Income Fundings Trust 2005-45 on September 28, 2005,
and to the Current Report(s) on Form 8-K filed by Principal Life
Insurance Company on behalf of Principal Life Income Fundings Trust
2005-45 on October 24, 2005, and to the Current Report(s) on Form 8-K
filed by Principal Life Insurance Company on behalf of Principal Life
Income Fundings Trust 2005-45 on December 27, 2005.Exhibit 99.2
    
    Annual Statement of Compliance by Citibank, N.A.Exhibit 99.3
    
    Report of Independent Registered Public Accounting Firm on Compliance.Section 302 CertificationAnnual Statement of ComplianceReport of Independent Registered Public Accounting Firm
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##### Table of Contents



SIGNATURES
  PRINCIPAL LIFE INSURANCE COMPANY
(Registrant)Date: March 24, 2006
    By:
    /s/ Karen A. PearstonName:
    Karen A. PearstonTitle:
    Second Vice President and Counsel 4




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##### Table of Contents



EXHIBIT INDEX
 ExhibitNumber
    
    DescriptionExhibit 31.1
    
    Section 302 Certification.Exhibit 99.1
    
    Indenture Trustee Reports of the Trust  Incorporated herein by
reference to Exhibit 99.1 to the Current Report(s) on Form 8-K filed
by Principal Life Insurance Company on behalf of Principal Life
Income Fundings Trust 2005-45 on June 29, 2005, and to the Current
Report(s) on Form 8-K filed by Principal Life Insurance Company on
behalf of Principal Life Income Fundings Trust 2005-45 on July 27,
2005, and to the Current Report(s) on Form 8-K filed by Principal
Life Insurance Company on behalf of Principal Life Income Fundings
Trust 2005-45 on August 26, 2005, and to the Current Report(s) on
Form 8-K filed by Principal Life Insurance Company on behalf of
Principal Life Income Fundings Trust 2005-45 on September 28, 2005,
and to the Current Report(s) on Form 8-K filed by Principal Life
Insurance Company on behalf of Principal Life Income Fundings Trust
2005-45 on October 24, 2005, and to the Current Report(s) on Form 8-K
filed by Principal Life Insurance Company on behalf of Principal Life
Income Fundings Trust 2005-45 on December 27, 2005.Exhibit 99.2
    
    Annual Statement of Compliance by Citibank, N.A.Exhibit 99.3
    
    Report of Independent Registered Public Accounting Firm on Compliance.
 5