A 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish.The dealer must, within 7 days, notify the lien holder in writing that the vehicle has been traded in. Print a "UCCU Authorization for Payoff form" and have the seller fill it out and sign it. If you want to get a payoff letter for the car loan, simply contact your lender. The Vehicle Payoff Sample Letter form is a crucial document for individuals aiming to transfer their vehicle loan to the State Department Federal Credit Union. Your account number is at the top of your monthly statement and on the payment coupon at the bottom of the statement. Online. The Vehicle Payoff Sample Letter form is a crucial document for individuals aiming to transfer their vehicle loan to the State Department Federal Credit Union. Loan Payoff Request correspondence on SSFCU letterhead. Instructions. Fill out online and submit.