Set loan terms with larger payments at the end. 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.Here's the information you'll need to have handy to complete your secured promissory note, installment with balloon final payment. These allow for smaller installment payments for a period of time but then require a large balloon payment at the end of the loan term. Typically, an owner finance transaction is set up using three documents. Payments are sent in installments or divided up in batches. Installment Payments with a Final Balloon Payment : These are used mostly in mortgage loans. Promissory notes are written agreements where one party promises to pay another party a specific sum of money at a future date or ondemand. Loan Agreements in Texas are typically comprised of two documents.