Auto Loan Payoff Calculator
See how much sooner you'd be debt-free and how much interest you'd save by paying extra on your car loan. Enter your balance, payment, and APR, then add an extra monthly amount or a one-time lump sum.
Already have a car loan? See how much sooner you'd be debt-free — and how much interest you'd save — by adding a little to each payment or putting a one-time lump sum toward the balance.
Current loan balance
What you still owe on the loan right now — the payoff balance from your latest statement, not the original loan amount.
Current monthly payment
The regular payment you make each month now. Use the principal-and-interest amount, not any escrow or add-ons.
Interest rate (APR)
The annual percentage rate on your loan, from your statement or loan agreement.
Extra monthly payment
An additional amount you'd add to every monthly payment. This goes straight to principal and is the biggest lever for paying off early.
One-time extra payment
A single lump sum you'd put toward the balance now — a tax refund, bonus, or windfall. Leave at 0 if none.
Interest You'd Save
$548
and you'd be debt-free 1 yr sooner
What your extra payments buy
By paying extra, you'd clear the loan in 3 yr 4 mo instead of 4 yr 4 mo, and keep $548 in interest in your pocket. Every extra dollar goes straight to principal, so the sooner you start, the more you save.
Assumes a standard fixed-rate, fully amortizing loan with interest charged monthly on the remaining balance, and that extra payments are applied to principal. Confirm your lender has no prepayment penalty and applies extra payments to principal — some apply them to future interest unless you ask.
💡About this calculator▼
If you already have a car loan, the fastest way to spend less on it is to pay it down faster — but it's hard to know whether throwing an extra $50 or $100 at it each month is actually worth it. This calculator answers that directly: it shows how many months sooner you'd be debt-free and exactly how much interest you'd keep in your pocket.
Enter what you owe right now, your current monthly payment, and your APR. Then add the two levers that pay a loan off early: an extra amount on every monthly payment, a one-time lump sum from a tax refund or bonus, or both. The tool re-runs your loan's amortization with those extra payments and compares it against your current schedule.
Because every extra dollar goes straight to principal, the savings compound — you stop paying interest on money you've already paid back. Seeing that trade-off in real numbers makes it easy to decide how aggressively to attack the loan, and whether a windfall is better spent here than elsewhere.
The calculator amortizes your loan month by month — the same way your lender does — and then runs a second amortization with your extra payments added, so it can compare the two side by side.
Each month, interest is charged on your remaining balance (your APR divided by twelve), and the rest of your payment goes to principal. As the balance falls, the interest portion shrinks and more of each payment chips away at what you owe. That's the schedule you're on now, and it sets your baseline payoff time and total remaining interest.
To model paying early, the tool first subtracts any one-time lump sum from your balance right away, then adds your extra monthly amount to every payment. It re-runs the same month-by-month math on that smaller balance with the bigger payment, which pays the loan off in fewer months and accrues less interest along the way.
The difference between the two runs is what you save: the months you shave off the end of the loan, and the interest you never have to pay because the balance is gone sooner. The exact formula and a worked example are below.
📐How it's calculated▼
The loan is amortized one month at a time, and the calculation is run twice — once on your current plan, once with extra payments.
Each month: Interest this month = Balance × (APR ÷ 12 ÷ 100) Principal this month = Payment − Interest this month New balance = Balance − Principal this month
The loop repeats until the balance reaches zero. The number of months it takes is your payoff time, and the interest charges added up are your total remaining interest.
With extra payments: Starting balance = Current balance − One-time lump sum Payment = Current payment + Extra monthly
The same month-by-month loop runs on this smaller balance with the larger payment.
Your savings: Months saved = Baseline months − New months Interest saved = Baseline interest − New interest
Example: $18,000 balance, $400/month, 6% APR, adding $100/month
→ On the current plan, it takes about 52 months to pay off, with roughly $2,442 in remaining interest.
→ Adding $100/month, the $500 payment clears the loan in about 40 months, with roughly $1,895 in interest.
→ That's about 12 months sooner and around $548 less interest — just from one extra $100 a month.
📎Source: Consumer Financial Protection Bureau — Auto Loans
🔍Finding your inputs▼
Current loan balance: What you still owe right now — the payoff balance, which you can find on your latest statement or by asking your lender. This is not the original loan amount; if you've been paying for a while, your balance is lower than what you started with. The payoff quote may be a few dollars higher than the statement balance because of accrued interest, but the statement balance is close enough for planning.
Current monthly payment: The regular payment you make each month. Use the principal-and-interest amount from your loan, not any extra you're already adding and not optional add-ons. If your statement bundles in things like gap insurance, use just the loan payment itself for the most accurate result.
Interest rate (APR): The annual percentage rate on your loan, listed on your statement or original loan agreement. This drives how much of each payment goes to interest versus principal. If your loan is at 0%, enter 0 — the tool will show time saved rather than interest saved.
Extra monthly payment: The additional amount you'd add to every monthly payment, on top of your current one. This is the most powerful lever for early payoff because it repeats every month and goes entirely to principal. Try a few amounts to see how sensitive your payoff date is — often even a modest $50–$100 makes a surprising difference.
One-time extra payment: A single lump sum you'd apply to the balance now — a tax refund, work bonus, or other windfall. It comes straight off your principal immediately, so you stop paying interest on it right away. Leave it at zero if you're only modeling recurring extra payments.
⚠️Special situations▼
My lender charges a prepayment penalty
Most auto loans have no prepayment penalty, but a few do — especially some subprime or older loans. A prepayment penalty is a fee for paying off early, which can eat into or even erase the interest you'd save. Check your loan agreement for a 'prepayment' clause before paying extra. If there is a penalty, compare its cost against the interest savings this tool shows; if the penalty is larger, paying early may not be worth it.
Extra payments are being applied to interest, not principal
This calculator assumes every extra dollar reduces your principal — that's what makes early payoff save money. But some lenders apply extra payments to 'next month's payment' or to future interest instead, which doesn't shorten the loan. When you make an extra payment, specify that it goes to principal (many lenders have a checkbox or a separate field online), and verify on your next statement that the balance dropped by the full amount.
I have negative equity (owe more than the car is worth)
If you owe more than the car would sell for, paying the loan down faster is one of the best uses of extra cash — it gets you back to positive equity sooner and reduces your risk if the car is totaled or you need to sell. This tool models the payoff regardless of the car's value, so the interest and time savings still apply. Just weigh it against keeping an emergency fund, since being underwater is riskier without cash reserves.
Should I pay off the car or invest the money instead?
This tool shows the guaranteed return from paying off the loan: your APR is effectively the rate of return on every extra dollar, since that's the interest you avoid. Compare that to what you'd reasonably expect elsewhere. Paying off a 7–9% car loan is a strong, risk-free return; if your rate is very low (say a 0–2% promotional loan), investing or keeping cash may make more sense. Also pay off higher-interest debt, like credit cards, before accelerating a lower-rate car loan.
The tool says my payment won't pay off the loan
If you see a warning that the loan won't amortize, it means the monthly payment you entered is smaller than the interest charged each month, so the balance would never go down. This usually means a typo — double-check the payment amount and the APR. A real auto loan payment is always larger than the monthly interest; if it weren't, the lender's own loan would never be repaid either.
❓Common questions▼
Does paying extra on my car loan really save money?
Yes — as long as the extra goes to principal and there's no prepayment penalty. Every extra dollar permanently removes that dollar from the balance, so you stop paying interest on it for the rest of the loan. The earlier in the loan you pay extra, the more you save, because that's when the balance (and the interest on it) is highest. This calculator shows exactly how much, based on your balance, rate, and how much extra you add.
Is it better to make extra monthly payments or one big lump sum?
Both reduce principal and save interest; the best choice depends on your cash flow. A lump sum from a refund or bonus takes a big bite out of the balance immediately, which maximizes savings if you can spare the cash. Extra monthly payments are easier to budget and add up steadily over time. The tool lets you model either or both at once, so you can see which combination fits your situation and how the savings compare.
Will paying off my car loan early hurt my credit score?
Paying off an auto loan early generally has little lasting effect, and any small dip is usually temporary. An installment loan in good standing helps your credit mix, so closing it can cause a minor, short-term drop — but you also save real interest money, which almost always outweighs a few points that recover over time. Don't carry debt you could pay off just to protect your score; the interest savings are the bigger financial win.
How do I make sure my extra payment goes to principal?
When you pay extra, tell your lender to apply it to principal — most online payment portals have a separate 'additional principal' field or a checkbox, and you can specify it on a check's memo line too. Then check your next statement: the balance should drop by your regular principal plus the full extra amount. If it instead just advanced your due date or sat as a credit toward next month, call the lender and ask them to reapply it to principal.
Should I pay off my car loan or save the money?
Paying off the loan gives you a guaranteed return equal to your APR — that's the interest you avoid, risk-free. If your rate is moderate or high (around 6% and up), that's a strong return and paying extra makes sense, provided you keep an emergency fund intact. If your loan is at a very low promotional rate, keeping the cash or investing it may come out ahead. And always clear higher-interest debt, like credit card balances, before accelerating a lower-rate car loan.