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Introduction to Calculating the Loan Level Issue Date Unpaid Principal Balance and User Scenarios

The Issue Date Unpaid Principal Balance is the scheduled unpaid principal balance (UPB) of the mortgage as of the loan acquisition date or the issue date of the associated security. 

Lenders have several options for populating the loan level Issue Date UPB:

  1. Include the LoanAcquisitionScheduledUPBAmount in your MISMO file
  2. Leave the LoanAcquisitionScheduledUPBAmount field in your MISMO file blank and have Loan Delivery perform the calculation for you. The calculated value will be displayed on the Loan Detail page.
  3. Manually enter the Issue Date UPB value on the Loan Detail page.

This job aid provides an overview of the different methods for calculating the Issue Date UPB based on the following payment scenarios.
For detailed instructions on how to perform other tasks, see the Loan Delivery User Guide, eLearning tutorials, or other job aids. If you do not have access to the Loan Delivery application and require it, contact your Fannie Mae Technology Manager.

Scenarios

NOTE: The same loan and pool information will be used for all scenarios.

Scenario 1: No Payments Made
    1a First Payment Date = Pool Issue Date
    1b First Payment Date 1 Month > Pool Issue Date 
    1c Same Month Pooling* 
Scenario 2: One Payment Made
    2a First Payment Date = Pool Issue Date 
    2b First Payment Date 1 Month > Pool Issue Date 
    2c Same Month Pooling* 
Scenario 3: Paid in Advance
    3a First Payment Date = Pool Issue Date
    3b First Payment Date 1 Month > Pool Issue Date 
    3c Same Month Pooling*
Scenario 4: No Payment – Curtailment
    4a First Payment Date = Pool Issue Date 
    4b First Payment Date 1 Month > Pool Issue Date
    4c Same-Month Pooling*
Scenario 5: One Payment, Curtailment
    5a First Payment Date = Pool Issue Date
    5b First Payment Date 1 Month > Pool Issue Date
    5c Same Month Pooling*
Scenario 6: Curtailment, Paid in Advance
    6a First Payment Date = Pool Issue Date
    6b First Payment Date 1 Month > Pool Issue Date
    6c Same Month Pooling*

*Same Month Pooling is an option for creating MBS pools that allows a lender to include in a pool mortgages that closes in the same month that the related MBS is issued (which means that the pools will have their first payment due two months after the MBS issue date).