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, interest-only with balloon final payment.The Texas Real Estate Lien Note is a oneway agreement in which the signer makes a promise to pay someone a specific sum of money at a specific time. If interest is charged, the rate should be included with a repayment schedule. Promissory notes are written agreements where one party promises to pay another party a specific sum of money at a future date or ondemand.