Add an extra amount to your monthly payment and see how much sooner your loan ends. Even $25 extra a month can shave months off your payoff date.
How much you still owe
Yearly cost of your loan as a percentage
Your required payment each month
Additional amount to pay each month
Compare your current plan with the extra-payment plan.
Interest Saved
$701.94
13 months sooner
Without Extra Payments
With Extra Payments
Savings
Impact of Extra Payments
Saves $701.94 and 13 months.
This calculator shows what happens when you add extra money to your monthly car payment. Enter your current balance, interest rate, and regular payment, then an extra amount — it rebuilds the payoff schedule and shows how many months earlier the loan ends and how much interest you avoid.
Extra payments punch above their weight because every extra dollar goes straight to principal. Interest is charged on your remaining balance, so shrinking the balance early means every future month charges you less interest. On a $20,000 balance at 6% with a $400 payment, an extra $100 a month pays the loan off about a year sooner and saves several hundred dollars in interest.
Two practical notes: confirm your lender applies extra amounts to principal (not "next month's payment") — sometimes this requires checking a box or calling — and make sure your loan has no prepayment penalty, though most auto loans today do not. If you have higher-interest debt like credit cards, paying that down first usually saves more.
Interest accrues on your remaining balance each month. Extra payments reduce the balance immediately, so every subsequent month charges less interest — and the savings compound over the remaining life of the loan.
Mathematically, money applied sooner saves more, so a consistent monthly extra usually beats saving up for an annual lump sum. The best plan is whichever one you will actually stick to — even $25 extra per month moves the payoff date.
Not always. Some lenders treat extra amounts as an early payment of next month's bill, which saves you nothing in interest. Check your loan portal for a "principal only" option, or contact the lender to confirm.
Compare rates. If your loan APR is higher than what savings earn, paying it down gives a guaranteed return. But keep a small emergency fund first — paying the loan to zero while having no cash cushion can backfire if a surprise expense hits.