A balloon payment moves part of the capital to the end of the agreement. That can reduce the contractual monthly instalment, but it does not make the deferred amount disappear.
Test two moments, not one
First test whether the instalment fits after existing debt, insurance, fuel, maintenance and ordinary living costs. Then ask what must happen when the balloon falls due. Paying cash, refinancing or selling the vehicle each carries a different risk, and future resale value is not guaranteed.
An affordability audit records the balloon separately instead of letting it blend into the monthly figure. It also compares a proposal with and without the deferred amount where the quotation permits that comparison.
Questions to take back
Ask for the total cost of credit, the exact balloon amount, any mileage or condition assumptions behind a future trade-in discussion, and what happens if refinancing is unavailable. A manageable agreement should remain understandable after the attractive headline instalment is removed.