Car Loan Balloon Payment Calculator NZ 2026
This calculator works out your car loan repayments when the loan includes a balloon payment, sometimes called a residual, and shows you exactly what that balloon costs. A balloon is a large lump sum that is parked at the end of the loan term rather than paid off along the way. Because part of the loan is deferred to the end, your monthly repayments drop, which is why dealers and lenders often promote balloon finance to make a car look more affordable. The catch is that you keep paying interest on the deferred amount for the whole term, and the balloon is still due in full when the term ends, so a balloon almost always increases the total amount you pay. This tool makes the trade-off clear. You enter the vehicle price, your deposit, the interest rate, the loan term, and the balloon amount you are considering, and it returns your monthly repayment, the balloon due at the end, the total interest, and the total cost over the life of the loan. Crucially, it also shows what the monthly repayment and total interest would be on a standard loan with no balloon, so you can see in dollars how much lower the monthly payment is and how much extra interest you pay for that convenience. A sensible rule of thumb is to keep the balloon below what you expect the car to be worth at the end of the term, so you can clear it by selling or trading the vehicle rather than being caught with negative equity. Figures are an estimate for comparison; your lender's quote and fees will be the final word.
Total cost includes your deposit, all repayments and the balloon. A balloon lowers monthly payments but raises total interest. An estimate; lender fees not included.
How it works
The amount financed is the price less your deposit. The monthly rate is the annual rate divided by 12, and the number of payments is the term in years times 12. The repayment is set so that the loan, less the present value of the balloon, is paid off over the term, which keeps the balloon owing at the end. Total interest is all repayments plus the balloon, less the amount financed. The no-balloon figure recalculates the same loan with the balloon set to zero, for comparison.
Worked example
A $35,000 car with a $5,000 deposit means $30,000 financed at 9.95 percent over 4 years, with a $10,000 balloon. The repayment is about $590 a month, with $10,000 due at the end. Total interest is about $8,305 and the total cost about $43,305. Without the balloon the repayment would be about $760 a month, so the balloon saves roughly $170 a month but adds to the interest and leaves a $10,000 lump sum to settle.
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