With this type of loan, you must pay off the remaining balance, or a "balloon payment," at the end of the loan term. Balloon mortgages offer low monthly payments at first, and can be used as a financing option for some homebuyers.Here's what REALTORS® need to know. This tool figures a loan's monthly and balloon payments, based on the amount borrowed, the loan term and the annual interest rate. A balloon mortgage is one of many loan types you can get to buy a home. Balloon loans are short-term loans that provide the benefit of low monthly payments.