Here's the information you'll need to have handy to complete your unsecured promissory note, interest-only with balloon final payment. The Texas Promissory Note Installment is a contract between the Lender and the Borrower.Set loan terms with larger payments at the end. If interest is charged, the rate should be included with a repayment schedule. Learn everything you need to know about balloon notes in mortgage loans. Find out how they work and how they can affect your finances. Promissory Note with Balloon Payments - Read online for free. This document is used to loan or borrow money. Here's the information you'll need to have handy to complete your secured promissory note, interest-only with balloon final payment.