A 10day payoff refers to the time it takes for your new lender to pay off your old loans during a refinance. The new interest calculation applies when an FHA loan with a Note date of January 21, 2015 or after, is paid in full.Mail or place completed forms in the court dropbox located at the. Family Court at 3341 Power Inn Road, Sacramento, CA 95826. It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. You may calculate a loan payoff under My Account, or feel free to give us a call at (916) 732-5081 to find out your payoff balance. This amount does change each. This amount does change each day since the loan accrues interest on a per diem. Per Diem Interest; Payoff Amount.