Set loan terms with larger payments at the end. Here's the information you'll need to have handy to complete your secured promissory note, installment with balloon final payment.If interest is charged, the rate should be included with a repayment schedule. The Texas Secured Promissory Note Template is available for download via the links on this page (in two forms – . Our Texas Promissory Note sample is a legally binding document that you can download and edit to protect your legal rights in the loan relationship.