Set loan terms with larger payments at the end. What will be the principal amortization schedule?Such table should also clearly indicate any balloon payments as well, with any required Civil Code language if it is related to a residential loan. All you need to know about promissory notes. Use our builder or a free customizable template for home, car, or business Loan. Balloon Loan Payment Calculator. An unsecured promissory note with amortized payments is a promise to pay back a loan when there's no collateral, and it'll be repaid in equal installments. It gets confusing when interest is involved. Amortization schedules can be calculated online.