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. Here's the information you'll need to have handy to complete your unsecured promissory note, interest-only with balloon final payment.Here's the information you'll need to have handy to complete your secured promissory note, interest-only with balloon final payment. All payments shall first be applied to outstanding late fees, then to interest and the balance to the Principal amount. A monthly interest rate can be included on the promissory note.