Step 1: Enter the remaining balance
Use the principal balance still owed today, not the original amount financed.
Auto loan early payoff calculator
2026 auto loan early payoff calculator.
See how extra monthly payments or a lump sum can shorten your car loan and reduce remaining interest.
Formula shown
Front-end only
No prepayment penalty modeled
Updated August 2, 2026
Amortization preview
Your accelerated payoff, month by month.
Preview the first year or expand the schedule to see how extra principal changes interest and remaining balance.
First payment
$0
Principal in first payment
$0
Interest in first payment
$0
Payoff
48 months
On small screens, swipe the table sideways to see every column.
| Month | Payment | Principal | Interest | Balance |
|---|
Direct answer
How an auto loan early payoff calculator works.
An early payoff calculator compares the scheduled remaining loan with a faster schedule that applies extra monthly payments and any lump sum to principal.
The monthly payment stays based on the original amortization unless your lender re-amortizes the loan. Extra amounts shorten the number of months and usually reduce total interest because less principal remains to accrue interest later.
Calculation steps
Early payoff estimate, step by step.
Step 2: Calculate the scheduled payment
The calculator uses your APR and remaining term to estimate the fixed monthly payment.
Step 3: Apply a lump sum first
Any one-time lump sum reduces the starting balance before the monthly schedule begins.
Step 4: Add extra monthly principal
Each month, the schedule applies the scheduled payment plus the extra amount toward interest and principal.
Step 5: Compare months and interest
Months saved and interest saved show the difference between the original schedule and the accelerated schedule.
Key definitions
Terms used in the early payoff estimate.
- Current loan balance:
- The principal amount still owed on the existing auto loan.
- Remaining term:
- The number of scheduled payments left if you make only the required payment.
- Extra monthly payment:
- An additional amount applied to principal with each scheduled payment.
- Lump sum:
- A one-time principal payment applied before the monthly schedule starts.
- Interest saved:
- Estimated remaining interest on the original schedule minus interest on the accelerated schedule.
Formula source
Why the payoff estimate is transparent.
M = P x r(1+r)n / ((1+r)n - 1)
M is the scheduled monthly payment, P is the loan balance, r is the monthly interest rate, and n is the remaining number of payments.
After the scheduled payment is calculated, each month accrues interest on the remaining balance. Extra principal reduces that balance sooner, so later interest charges fall and the loan can reach zero before the original term ends. The model assumes fixed APR, on-time payments, and that extras are applied to principal.
Worked example
What the default early payoff estimate means.
With a $20,000 balance, 7.5% APR, and 48 months remaining, the scheduled payment is about $484 per month.
Adding $100 extra each month shortens the loan to about 39 months and reduces remaining interest by roughly $634.
| Scheduled payment | $484/mo |
|---|---|
| Total monthly payment | $584/mo |
| Original payoff | 48 months |
| Early payoff | 39 months |
| Months saved | 9 months |
| Interest saved | ~$634 |
This example is illustrative. Actual payoff timing depends on how your lender posts extra principal, any fees, and the exact payoff quote.
Methodology
What this estimate includes.
Scheduled loan baseline
The original payment, remaining interest, and payoff length are estimated from the balance, APR, and remaining term you enter.
Accelerated schedule
A lump sum reduces the starting balance. Each month then applies the scheduled payment plus any extra monthly amount until the balance reaches zero.
What is not included
Prepayment penalties, lender processing delays, biweekly conversion quirks, skipped payments, variable rates, insurance, taxes, and any costs not entered by you.
How to use the result
Ask the lender to confirm that extras go to principal and request an official payoff quote before sending a large lump sum. Compare early payoff with refinancing if your goal is a lower rate instead of a shorter term.
FAQ
Auto loan early payoff questions.
How does an auto loan early payoff calculator work?
It builds the scheduled payment from your remaining balance, APR, and term, then rebuilds the amortization with extra monthly payments and any lump sum applied to principal. The comparison shows months saved and interest saved.
Do extra payments reduce interest on a car loan?
Yes, when the extra amount is applied to principal. A lower balance accrues less interest in later months, so total interest usually falls and the loan can end earlier.
Is it better to make a lump sum or extra monthly payments?
A lump sum applied early usually saves more interest than spreading the same cash later. Extra monthly payments are useful when you want a smaller recurring commitment. Try both inputs before deciding.
Should I pay off my car loan early?
It can help when the APR is high or you want the car paid off sooner. It may be less useful if the rate is low, a prepayment penalty applies, or the cash is needed elsewhere. This tool estimates the loan math only.
Does this calculator include prepayment penalties?
No. Check your contract or ask the lender whether early payoff fees apply before sending extra principal.
Will paying off my car loan early hurt my credit?
Closing an installment loan can change credit mix and account age, but the effect depends on your full credit profile. AutoLoanLabs does not estimate credit score changes.