Calculating Actual UPB
The actual UPB of a mortgage loan in a given month is calculated the same way for all remittance or delivery types except actual/actual biweekly. To determine the current month's actual UPB of a mortgage loan except actual/actual biweekly, the servicer must use the following calculation:
To determine the current actual UPB of an actual/actual biweekly mortgage loan, the servicer must use this calculation:
This current UPB must equal the UPB on the servicer's trial balance at the end of the activity month.
For more information see Investor Reporting Manual Chapter 2-04, Reporting Specific Payment Transactions to Fannie Mae (02/14/2018).