Use the balloon payment calculator to estimate the monthly payment and the final lump sum of a given balloon loan construction. Balloon mortgages generally have lower interest rates.A balloon payment is a large one-time amount due at the end of a loan. Mortgages, auto loans, and business loans have been structured for balloon payments. A balloon payment is a large payment due at the end of a mortgage. Edit, sign, and share balloon mortgage note online. No need to install software, just go to DocHub, and sign up instantly and for free. 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.