This car loan payoff calculator takes the auto loan you already have — remaining balance, rate, and current monthly payment — and shows how much faster it disappears when you add an extra monthly payment or a one-time lump sum. You'll see the new payoff date, the months you saved, and the interest you avoided, with a year-by-year chart comparing your current plan to the accelerated one.

Auto loans are a strong candidate for early payoff because the rates are high and the asset is depreciating. Experian's State of the Automotive Finance Market puts average used-car APRs above 11% in recent years, and Federal Reserve G.19 consumer credit data shows auto loan rates at multi-decade highs. Unlike a house, a car loses value every year — the sooner the loan is gone, the sooner you stop paying double-digit interest on a shrinking asset.

Note this tool is for a loan you're already paying. If you're still shopping and want to model price, down payment, and trade-in, use the Car Loan Calculator. For payoff planning across multiple debts at once — cards, car, personal loans — the Debt Payoff Optimizer compares snowball and avalanche strategies.

The calculator simulates your amortization month by month, twice — with and without the extra money — then compares:

Worked example — $18,000 remaining at 9% APR, $420/month: the baseline payoff takes about 50 months with roughly $3,500 in total interest. Add $75/month and you're done in about 43 months, saving around $600. Add a $2,000 tax-refund lump sum on top and payoff drops to roughly 37 months with over $1,000 of interest avoided. Every figure updates live as you drag the sliders.

Nearly all auto loans made today use simple interest, so this math applies directly. The exception worth checking: some subprime contracts use precomputed interest (including the Rule of 78s), where the interest charge is fixed up front and early payoff saves less. The CFPB explains the difference — your loan contract states which type you have.

The most common way drivers lose the benefit of extra payments is letting the lender treat them as an advance on next month's bill instead of a principal reduction. An "advance" just pre-pays your regular payment — interest keeps accruing on the full balance, and you save nothing.

• In your lender's app or portal, look for a "principal only" payment option and use it for every extra dollar.
• If paying by check or phone, state in writing that the payment is to be applied to principal.
• Check your next statement: the balance should drop by the full extra amount, and your due date should not jump forward a month.

Also confirm there's no prepayment penalty — they're uncommon on auto loans and prohibited or capped in many states, but the contract governs. If your APR is painfully high, compare a payoff sprint against refinancing with the Loan Refinance Calculator: dropping from 14% to 8% and keeping your old payment amount is the fastest exit of all.

If you owe more than the car is worth (negative equity), extra principal payments are how you climb out. Compare your payoff quote to the vehicle's value on a pricing guide; the gap is your negative equity. Extra payments close that gap from the loan side while depreciation slows on the vehicle side — most borrowers who accelerate cross back into positive equity within a year or two, which restores your ability to sell or trade without rolling debt into the next loan. Rolling negative equity forward is precisely how car payments spiral, and it's the pattern the CFPB has repeatedly warned about in auto lending reports.