Balloon mortgages generally have lower interest rates. A balloon payment is a large payment due at the end of a mortgage.Balloon mortgages usually have terms ranging between five and seven years and lower interest rates than traditional fixed-rate mortgages. 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 loan is usually rather short, with a term of three to five years, but the payment is based on a term of up to 15 years. Balloon Mortgages typically offer lower interest rates and payments, but they may be too risky for some homebuyers. Call Scott D. Rogoff at (847) 768-2194. A balloon mortgage has an interest rate that is fixed for an initial amount of time. At the end of the term, the remaining principal balance is due.