A Promissory Note with Balloon Payments is a loan contract that enables a lender set loan terms with one or more larger payments at the end. Borrower promises to make a single, final payment for the entire balance owed to the Payee on or before.Here's the information you'll need to have handy to complete your secured promissory note, installment with balloon final payment. All prepayments shall first be applied to outstanding late fees, then to accrued interest and thereafter to the principal loan amount. This Agreement also will secure payment of these amounts. A City Loan Agreement includes: Loan Agreement, Promissory Note, Deed of Trust, UCC Financing.