e424b2
 

             
Pricing Supplement Dated  July 10, 2007   Filed pursuant to Rule 424(b)(2)
(To Prospectus dated February 16, 2006, and
  Registration Statement Nos.   333-129763 and
Prospectus Supplement dated February 16, 2006)
      333-129763-01
 
           
      CUSIP: 74254PSX1

(PRINCIPAL FINANCIAL GROUP LOGO)

Principal Life Insurance Company
Secured Medium-Term Notes (that are also Asset-Backed Securities)
Issued Through and Obligations of
Principal Life Income Fundings Trust 31 (the “Trust” and the “Issuing Entity”)

     The description of this pricing supplement of the particular terms of the Secured Medium-Term Notes offered hereby, and the Funding Agreement (specified below) issued by Principal Life Insurance Company (“Principal Life”) to the Trust, the payment obligations of which are fully and unconditionally guaranteed by the Guarantee (specified below) issued by Principal Financial Group, Inc. to the Trust, supplements the description of the general terms and provisions of the notes, the funding agreements and the guarantees set forth in the accompanying prospectus and prospectus supplement, to which reference is hereby made.

1. The Notes


                     
Principal Amount:
  $ 250,000,000     Purchasing Agent(s) Discount:   0%    
 
                   
Issue Price:
    100%     Original Issue Date:   July 17, 2007
 
                   
Net Proceeds to the Trust:
  $ 250,000,000     Stated Maturity Date:   July 17, 2009
 
                   

                     
Specified Currency:
  U.S. Dollars
 
                   
Interest Payment Dates:
  January 17, April 17, July 17 and October 17 of each year
 
                   
Initial Interest Payment Date:
  October 17, 2007
 
                   
Regular Record Date:
  15 calendar days prior to the Interest Payment Date
 
                   
Type of Interest Rate:
  o Fixed Rate   x Floating Rate    
 
                   
Fixed Rate Notes:
  o Yes x No.   If, Yes,
 
                   
Interest Rate:
                   
 
                   
Floating Rate Notes:
  x Yes o No.   If, Yes,
 
                   
Regular Floating Rate Notes:
  x Yes   o No.   If, Yes,
Interest Rate:
  3-Month LIBOR - .015%
Interest Rate Basis(es):
  See below
 
                   
Floating Rate/Fixed Rate Note:
  o Yes   x No.   If, Yes,
Floating Interest Rate:
   
Interest Rate Basis(es):
   
Fixed Interest Rate:
   
Fixed Rate Commencement Date:
   

 


 

             
Inverse Floating Rate Note:
  o Yes   x No.   If, Yes,
Fixed Interest Rate:
   
Floating Interest Rate:
   
Interest Rate Basis(es):
   
 
                   
Initial Interest Rate, if any:
  3-Month LIBOR - .015% determined on the second business day preceding the Original Issue Date.
 
                   
Initial Interest Reset Date:
  October 17, 2007
 
                   
Interest Rate Basis(es). Check all that apply:
       
 
  o CD Rate   o Commercial Paper Rate
 
  o CMT Rate   o Eleventh District Cost of Funds Rate
 
  o Constant Maturity Swap Rate   o Federal Fund Open Rate
 
  x LIBOR   o Federal Funds Rate
 
  o EURIBOR   o Treasury Rate
 
  o Prime Rate   o Other (See Attached)
 
           
If LIBOR:
  x LIBOR Reuters Screen LIBOR01 Page   o LIBOR Moneyline Telerate Page 3750
 
       LIBOR Currency: U.S. Dollars    
 
           
If CMT Rate:
           
Designated CMT Telerate Page:
       
If 7052:
  o Weekly Average   o Monthly Average
Designated CMT Maturity Index:
       
 
           
Index Maturity:
  3-Month
 
           
Spread (+/-):
  - .015%
 
           
Spread Multiplier:
  Not Applicable
 
           
Interest Reset Date(s):
  Each Interest Payment Date
 
           
Interest Rate Determination Date(s):
  The second business day preceding the Interest Reset Date
 
           
Maximum Interest Rate, if any:
  Not Applicable
 
           
Minimum Interest Rate, if any:
  Not Applicable
             
Calculation Agent:
  Citibank, N.A.    
 
           
Exchange Rate Agent:
  Not applicable    
 
           
Computation of Interest (not applicable unless different than as specified in the prospectus and prospectus supplement):
 
Day Count Convention (not applicable unless different than as specified in the prospectus and prospectus supplement):
 
           
Amortizing Notes:
  o Yes   x No.   If, Yes,
Amortizing Schedule:
   
Additional/Other Terms:
   
 
           
Discount Note:
  o Yes   x No.   If, Yes,
Total Amount of Discount:
   
Initial Accrual Period of Discount:
   
Additional/Other Terms:
   
 
           
Redemption Provisions:
  o Yes   x No.   If, Yes,
Initial Redemption Date:
   
Initial Redemption Percentage:
   
Annual Redemption Percentage Reduction (if any):
   
Redemption:
  o In whole only and not in part    
  o May be in whole or in part    
Additional/Other Terms:
   

 


 

             
Repayment:
  o Yes   x No.   If, Yes,
Repayment Date(s):
   
Repayment Price:
   
Repayment:
  o In whole only and not in part    
  o May be in whole or in part    
Additional/Other Terms:
   
 
           
Sinking Fund (not applicable unless specified):
 
 
           
Additional Amounts to be Paid for Withholding Tax (not applicable unless specified):
 
           
Securities Exchange Listing:
  o Yes   x No.   If, Yes, Name of Exchange:
 
           
Authorized Denominations:
  $1,000        
Ratings: The Notes issued under the Program are rated AA by Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc. (“S&P”). Principal Life expects the Notes to be rated Aa2 by Moody’s Investors Service, Inc. (“Moody’s”).
             
Purchasing Agent(s) Purchasing Notes as Principal:
  x Yes   o No.   If, Yes,
         
Purchasing Agent(s)
  Principal Amount
 
       
Barclays Capital Inc.
  $ 250,000,000  
 
       

 
Total:
  $ 250,000,000  
             
Purchasing Agent(s) Acting as Agent:
  o Yes   x No.   If, Yes,
         
Purchasing Agent(s)
  Principal Amount
 
       
 
                                         
 
       

 
Total:
       
                 
State of Organization of the Trust:
New York            
 
               
Additional/Other Terms:
           
 
               
Special Tax Considerations:
           
 
               
2. The Funding Agreement
             
 
               
Funding Agreement Issuer:
Principal Life Insurance Company
 
               
Funding Agreement No.:
8-04134            
 
               
Deposit Amount:
  $250,000,015        
 
               
Net Deposit:
$250,000,000        
 
               
Effective Date:
July 17, 2007        
 
               
Stated Maturity Date:
July 17, 2009        
 
               
Specified Currency:
  U.S. Dollars
 
               
Interest Payment Dates:
  January 17, April 17, July 17 and October 17 of each year  
 
               
Initial Interest Payment Date:
  October 17, 2007
 
               
Type of Interest Rate:
  o Fixed Rate   x Floating Rate    
 
               
Fixed Rate Funding Agreement:
  o Yes x No.   If, Yes,

 


 

             
Interest Rate:
               
 
               
Floating Rate Funding Agreement:
  x Yes o No.   If, Yes,
 
               
Regular Floating Rate Funding Agreement:
  x Yes   o No.   If, Yes,
Interest Rate:
  3-Month LIBOR - .015%            
Interest Rate Basis(es):
  See below            
 
               
Floating Rate/Fixed Rate Funding Agreement:
  o Yes   x No.   If, Yes,
Floating Interest Rate:
   
Interest Rate Basis(es):
   
Fixed Interest Rate:
   
Fixed Rate Commencement Date:
   
 
               
Inverse Floating Rate Funding Agreement:
  o Yes   x No.   If, Yes,
Fixed Interest Rate:
   
Floating Interest Rate:
   
Interest Rate Basis(es):
   
 
               
Initial Interest Rate, if any:
  3-Month LIBOR - .015% determined on the second business day preceding the Original Issue Date.
 
               
Initial Interest Reset Date:
  October 17, 2007
             
Interest Rate Basis(es). Check all that apply:
       
 
  o CD Rate   o Commercial Paper Rate
 
  o CMT Rate   o Eleventh District Cost of Funds Rate
 
  o Constant Maturity Swap Rate   o Federal Funds Open Rate
 
  x LIBOR   o Federal Funds Rate
 
  o EURIBOR   o Treasury Rate
 
  o Prime Rate   o Other (See Attached)
 
           
If LIBOR:
  x LIBOR Reuters Screen LIBOR01 Page   o LIBOR Moneyline Telerate Page 3750
 
       LIBOR Currency: U.S. Dollars    
 
           
If CMT Rate:
   
Designated CMT Telerate Page:
       
If 7052:
  o Weekly Average   o Monthly Average
Designated CMT Maturity Index:
       
             
Index Maturity:
  3-Month        
 
           
Spread (+/-):
  - .015%        
 
           
Spread Multiplier:
  Not Applicable        
 
           
Interest Reset Date(s):
  Each Interest Payment Date        
 
           
Interest Rate Determination Date(s):
  The second business day preceding the related Interest Reset Date
 
           
Maximum Interest Rate, if any:
  Not Applicable        
 
           
Minimum Interest Rate, if any:
  Not Applicable        
 
           
Calculation of Interest (not applicable unless different than as specified in the prospectus and prospectus supplement):
 
Day Count Convention (not applicable unless different than as specified in the prospectus and prospectus supplement):
 
           
Amortizing Funding Agreement:
  o Yes   x No.   If, Yes,
Amortizing Schedule:
           
Additional/Other Terms:
   
 
           
Discount Funding Agreement:
  o Yes   x No.   If, Yes,
Total Amount of Discount:
           
Initial Accrual Period of Discount:
           
Additional/Other Terms:
   

 


 

             
Redemption Provisions:
  o Yes   x No.   If, Yes,
Initial Redemption Date:
   
Initial Redemption Percentage:
   
Annual Redemption Percentage Reduction (if any):
Redemption:
  o In whole only and not in part    
 
  o May be in whole or in part    
Additional/Other Terms:
   
 
           
Repayment:
  o Yes   x No.   If, Yes,
Repayment Date(s):
           
Repayment Price:
           
Repayment:
  o In whole only and not in part    
 
  o May be in whole or in part    
Additional/Other Terms:
           
 
           
Sinking Fund (not applicable unless specified):
           
 
           
Additional Amounts to be Paid For Withholding Tax (not applicable unless specified):

Ratings: The Funding Agreement issued under the Program is rated AA by S&P. Principal Life expects the Funding Agreement to be rated Aa2 by Moody’s.

     
Additional/Other Terms if any:
   
 
   
Special Tax Considerations:
   
 
   
3. The Guarantee
   
 
   
Guarantee Issuer:
  Principal Financial Group, Inc.
 
   
Effective Date:
  July 17, 2007
 
   
Additional/Other Terms if any: