Writing a promissory note should be tailored to your specifications of that particular loan. Check out a free preview of a promissory note at 12Law.Promissory Installment Note (with Balloon Payment) - North Carolina - Business Document Form - Download Online. A balloon note is a type of loan where the borrower is required to make regular payments, called interestonly payments, for a specified period. Balloon maturity refers to a scenario when the final payment to repay a debt is significantly larger than the previous payments. A balloon payment is a lump sum payment that is significantly larger than the monthly payments and paid at the end of a loan's term. For purposes of this subdivision, a balloon payment means any scheduled payment that is more than twice as large as the average of earlier scheduled payments. Click Calculate and lower half of the screen will populate with the entered Term and Balloon Contract APR,.