Use this unsecured promissory note (installment with balloon final payment) to make your loan official. Create and download a promissory note for free!The Application Process: 1. Apply for and have your eligibility determined for other sources of financial aid, including federal and state grants. A balloon payment is a type of payment schedule. You make lower monthly payments and one final, large payment to pay off the rest of the loan. A balloon payment is similar to installments, except the monthly installments are the same. Basic Parts of the Loan Agreement: Commitment letters, promissory notes, credit agreements, mortgages, assignments and guarantees. The Minnesota Secured Promissory Note Template is a legal document used to detail the principal sum, interest rate, payment method, and other facets of a loan. Promissory Note With Balloon Payment Template Fill Online Printable Fillable Blank pdfFiller.