How a balloon loan is structured

FeatureBalloon loanStandard 30-year fixed
Payment based onLong schedule (e.g. 30 years)30 years
Loan actually lasts3 to 10 years30 years
Final paymentLarge lump sumLast regular payment
Main riskNot able to refinanceNone at maturity

The low monthly payment comes from spreading repayment over a long schedule, but the lump sum arrives early. If you expect to sell, pay from a known source, or refinance on solid footing, a balloon loan can work. Otherwise a fixed-rate loan is safer. See the ARM vs fixed calculator to compare other structures.