Auto Loan Payoff Calculator
Last updated: October 15, 2026
Estimate how quickly an auto loan can be paid off and how much interest may be saved by adding an extra monthly payment.
Estimated payoff time with extra payment
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- Estimated months to payoff: —
- Estimated interest with extra payment: —
- Estimated interest without extra payment: —
- Estimated interest saved: —
On this page
Quick summary: Estimate how quickly an auto loan can be paid off and how much interest may be saved by adding an extra monthly payment.
Read the method, example and limitations
Updated reference sections in this guide are in English.
Guide language: English. Updated October 15, 2026.
What this calculator estimates
Estimate how quickly an auto loan can be paid off and how much interest may be saved by adding an extra monthly payment.
Inputs and units
Enter Current auto-loan balance ($), Annual interest rate (%), Current monthly payment ($), Extra monthly payment ($). Use the units shown. Required fields cannot be blank. Use zero only where that field and the model allow it. Select Calculate after changing the values.
Method and assumptions
Each monthly step adds balance x APR / 1200 in interest, then subtracts the entered payment plus extra, capped at the amount owed. The final payment can be smaller. The original-payment schedule is simulated separately for comparison.
Worked example
A 1,000 balance at 0% with 100 monthly is repaid in 10 months with no interest. If a 5 payment on a 1,000 balance at 12% cannot amortize the loan, adding 100 can still produce an 11-month payoff; original-plan savings are then unavailable.
Limitations
Payments are assumed monthly after interest accrual, with no new charges or fees. Unfinished schedules are explicitly reported after the 1,200-month simulation limit; the limit is not a payoff date.