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Auto Loan Early Payoff Calculator

Use this auto loan early payoff calculator to see exactly how much interest and time extra payments or a one-time lump sum save, find your loan balance today, and check whether refinancing beats paying early. Enter your original loan details and how many payments you have made; the calculator rebuilds the schedule from there.

Updated October 8, 2026. Every formula on this page is published below and tested against an independent implementation. Embed on your site

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How the auto loan early payoff calculator works

Most auto loans are fixed-rate installment loans, so they amortize the same way a mortgage does. Your scheduled payment comes from the standard formula:

M=P r (1+r)n(1+r)n−1M = P\,\frac{r\,(1+r)^{n}}{(1+r)^{n}-1}
Scheduled monthly payment

To work out what you owe today, you need the balance after the payments you have already made. Rather than replaying every month, you can jump straight there:

Bk=P (1+r)k−M (1+r)k−1rB_k = P\,(1+r)^{k} - M\,\frac{(1+r)^{k}-1}{r}
Balance remaining after k payments
P
Amount financed: the price plus taxes and fees, minus your down payment and trade-in
r
Monthly rate: the APR divided by 12
n
Term in months (60 for a five-year loan)
k
Payments already made
M
Scheduled monthly payment

The first term is what the original loan would have grown to with no payments; the second is what your k payments are worth at the same rate. The difference is your balance. For a $30,000 loan at 6% over 60 months, M is $579.98 and the formula gives $24,695.95 after 12 payments. The calculator's month-by-month schedule shows $24,695.96; the one-cent difference comes from lenders rounding interest every month, which the schedule reproduces.

What happens when you pay extra

An extra payment marked principal only lowers the balance immediately. Every later month then charges interest on a smaller balance, so more of your regular payment repays principal and the loan ends early. The calculator applies your extra monthly amount with each scheduled payment and a one-time payment with the next one, then rebuilds the rest of the schedule.

Simple-interest loans and the Rule of 78s

Most car loans today are simple-interest loans: interest accrues daily on the outstanding principal, so paying early or paying more saves interest. Our monthly model matches that closely for on-time payments. A few loans use precomputed interest, where the full finance charge is set at signing. If such a loan uses the Rule of 78s to calculate your refund when you pay early, you get back less interest than you would on a simple-interest loan. Federal law bars the Rule of 78s on precomputed consumer loans longer than 61 months, but it can still appear on shorter ones, so check your contract's "prepayment" section before you send extra money.

Worked example: paying off a $30,000 car loan early

Take a $30,000 loan at 6% APR for 60 months. The payment is $579.98, and after a year of payments the balance is $24,695.96 with $3,143.37 of interest still to come over 48 payments. Here are four ways forward:

Remaining 48 months of a $30,000, 6% auto loan
StrategyPayments leftInterest still to paySaved
Keep the schedule48$3,143.37—
Add $100 every month41$2,625.45$517.92
Pay $2,000 once, now44$2,636.25$507.12
Refinance at 4.5% for 48 months, $300 fees48$2,335.47$507.90

The $100 a month clears the loan 7 months early and saves $517.92, but it takes $4,000.00 of extra payments to get there. The single $2,000 payment saves almost as much, $507.12, because it starts cutting interest on day one. Timing matters as much as the amount: a dollar of principal paid now avoids interest for every remaining month.

Refinancing to 4.5% for the same 48 months lowers the payment to $563.15 and saves $507.90 after $300 of fees, which the lower payment earns back in 1 year 6 months. Stretch the new loan to 72 months instead and the payment drops to $392.02, but you would pay $686.49 more in total because interest runs for two extra years. A lower payment is not the same thing as a cheaper loan.

Should you pay off your car loan early?

Paying a car loan early is a guaranteed return equal to its APR. Whether that is your best move depends on what else your money could do and on the fine print of your contract.

When early payoff usually makes sense
SituationUsually the better move
APR above about 7% and an emergency fund in placePay extra; few safe options earn more.
Credit card balances at 20%+ APRClear the cards first, then the car.
Promotional 0% to 3% APRKeep the schedule; your cash likely earns more in savings.
You owe more than the car is worthPay down principal to get out of negative equity before you sell.
Precomputed loan using the Rule of 78sRead the refund terms; early payoff saves less.
Rates have dropped or your credit has improvedGet refinance quotes and compare total cost.

A refinance checklist

  • Compare total cost, not the payment. Use the refinance check above with a term no longer than what you have left. Extending the term can turn a lower rate into a more expensive loan.
  • Count every fee. Lender origination fees, title transfer and state registration fees all count. Rolling them into the loan means paying interest on them too.
  • Check the break-even. If you plan to sell or trade in before the lower payment repays the fees, refinancing loses money.
  • Mind add-ons. GAP coverage or service contracts bought with the original loan may need to be cancelled for a partial refund or repurchased with the new one.

Before paying extra, ask your lender how to mark a payment as principal-only and request a payoff quote when you are close to the end; it includes interest up to the payoff date. If your car loan is one of several debts, the debt snowball vs. avalanche calculator shows which balance to attack first.

Is car loan interest tax deductible in 2026?

For many new-car loans, yes. For tax years 2025 through 2028, section 163(h)(4) of the Internal Revenue Code lets you deduct interest on a loan used to buy a qualifying vehicle for personal use, whether or not you itemize. Before 2025, interest on a personal car loan wasn't deductible, and it won't be again after 2028 unless the law changes. The loan and the vehicle both have to qualify:

  • A new vehicle. Its original use has to start with you; used vehicles don't qualify. It must be a car, minivan, van, SUV, pickup truck or motorcycle with a gross vehicle weight rating under 14,000 pounds.
  • Final assembly in the United States. The vehicle information label on the dealer's lot shows where it was assembled, or you can look up the plant of manufacture from the VIN with NHTSA's VIN decoder.
  • A loan taken out after December 31, 2024, to buy the vehicle and secured by a first lien on it, for personal use. Leases, fleet and commercial-vehicle loans, loans on salvage-title vehicles or vehicles bought for scrap or parts, and loans from a related person don't qualify. A refinance of a qualifying loan does, up to the amount refinanced.
  • The VIN on your return for every year you claim the deduction.

The deduction is capped at $10,000 of interest a year and shrinks by $200 for each $1,000 (or part of $1,000) of modified adjusted gross income above $100,000, or $200,000 on a joint return. The example loan pays $1,655.72 of interest in 2026. A single filer with $85,000 of modified AGI can deduct all $1,655.72; at $110,000 the deduction falls by $2,000.00 to $0.00.

A deduction lowers taxable income, not the tax itself, so it is worth the interest times your tax rate. That makes paying the loan off early a little less valuable while the deduction lasts. Turn on the calculator's car loan interest deduction to see the 2026 figure for your loan; whether your car and loan qualify is yours to check against the rules above.

The bottom line

Paying an auto loan early saves interest in proportion to how much principal you clear and how soon. On the example $30,000 loan at 6%, $100 extra a month saves $517.92 and finishes 7 months early, while a single $2,000 payment now saves $507.12.

Pay off higher-rate debt and keep an emergency fund first. Then use the auto loan early payoff calculator to compare your rate with what your cash earns elsewhere and with a refinance.

Frequently asked questions

How do I calculate my car loan payoff amount?

Your balance after k payments is B = P(1 + r)^k − M((1 + r)^k − 1) ÷ r, where P is the amount financed, r is the APR divided by 12 and M is your monthly payment. For a $30,000 loan at 6% over 60 months, that is about $24,695.96 after 12 payments, and this car loan payoff calculator works it out from your original loan details. The exact payoff figure from your lender also includes interest accrued since your last payment, so request a payoff quote that is good through the day you plan to pay.

Does paying extra on a car loan reduce interest?

Yes, on a simple-interest loan, which covers most auto loans. Interest is charged on the outstanding principal, so extra car payments applied to principal lower every future interest charge and shorten the loan. Tell your lender the extra amount is a principal-only payment; otherwise it may be held and applied to your next scheduled payment instead.

Is there a penalty for paying off a car loan early?

Many auto loans have no prepayment penalty, but some contracts include one and state rules vary, so check the prepayment section of your contract. Loans with precomputed interest can also reduce your savings: if the refund of unearned interest uses the Rule of 78s, you get back less than on a simple-interest loan. Federal law prohibits the Rule of 78s on precomputed consumer loans with terms longer than 61 months.

Is it better to pay a lump sum or extra every month?

Money paid sooner saves more interest, so a lump sum today beats the same total spread over later months. In our example, a single $2,000 payment on a $30,000, 6% loan saves $507.12, nearly the $517.92 saved by paying $100 extra every month, which adds up to $4,000.00 in extra payments. Monthly extra payments are still a good habit if you don't have a lump sum available.

When does refinancing a car loan make sense?

Whether to pay off a car early or refinance depends mostly on the rates. Refinancing tends to pay off when you can get a meaningfully lower APR, the fees are small, you keep the term the same or shorter, and you will keep the car long enough for the monthly savings to cover the fees. Compare the total of all remaining payments on your current loan with the total cost of the new loan including fees; a lower monthly payment alone can hide a more expensive loan.

Is car loan interest tax deductible?

For tax years 2025 through 2028, yes, if the loan was taken out after 2024 to buy a new car, SUV, van, pickup or motorcycle assembled in the United States for personal use, and secured by the vehicle. Leases and used cars don't qualify. You can claim it whether or not you itemize, and you must put the vehicle's VIN on your return.

How much is the car loan interest deduction?

The car loan interest deduction covers up to $10,000 of qualifying interest a year. It is reduced by $200 for each $1,000 (or part of $1,000) of modified adjusted gross income over $100,000, or $200,000 on a joint return. On the example loan, $1,655.72 of 2026 interest is fully deductible at $85,000 of income.

Will paying off my car loan early hurt my credit?

Paying off an installment loan can cause a small, usually temporary change in your credit score, because the account closes and your mix of open credit changes. The account stays on your report as paid as agreed, which is a positive record. For most people the interest saved outweighs a minor score fluctuation, unless you are about to apply for a mortgage or other major credit.

Sources and further reading

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