A monthly interest rate can be included on the promissory note. The payment will be applied on the interest due first and the principal after.Here's the information you'll need to have handy to complete your unsecured promissory note, interest-only with balloon final payment. Set loan terms with larger payments at the end. Typically, an owner finance transaction is set up using three documents. They can be structured with fixed, variable, or balloon payment schedules, adapting to the financial capabilities of the borrower. Get a non-bank loan that's paid back in installments with a secured promissory note. Create and download a promissory note for free! Payments are sent in installments or divided up in batches. Installment Payments with a Final Balloon Payment : These are used mostly in mortgage loans.