Balloon Promissory Note: The borrower makes smaller payments initially, with a large "balloon" payment at the end of the loan term. Use this unsecured promissory note (installment with balloon final payment) to make your loan official.Create and download a promissory note for free! Hillsborough County Promissory Note Form. An unsecured promissory note with a balloon payment can be a great way to obtain financing for your business. The note doesn't require collateral. Lender shall provide Borrower with a final written statement of monies due prior to the due date of the balloon payment. Set loan terms with larger payments at the end. How to fill out the Unsecured Promissory Note Template? 1. Enter the borrower's and lender's information. 2.