The calculation
How the car loan payoff calculator works
The calculator starts with your current principal balance, then applies one month of interest at APR divided by 12. Your monthly payment covers that interest first; the rest reduces principal. It repeats the calculation until the balance reaches zero, once with your regular payment and once with the extra amount added.
This is a planning estimate for a fixed-rate amortizing loan. Many auto loans accrue simple interest daily, so exact interest and payoff dates can differ with payment timing, lender rules, fees and rounding.
Worked example
Adding $100 to a $22,000 car loan
With a $22,000 balance at 7.2% APR and a $450 monthly payment, the regular payoff takes about 59 months and costs roughly $4,100 in remaining interest. Paying $550 instead shortens the estimate to about 46 months and reduces remaining interest by roughly $900.
These rounded example figures are illustrative. Use the calculator above for the full unrounded schedule.
Before paying extra
Make sure the extra payment reduces principal
Some lenders may hold an overpayment for a future bill instead of applying it to principal immediately. Check the payment instructions or contact the lender and specify that the extra amount should reduce principal. Then review the next statement to confirm the balance changed as expected.
- Ask whether the loan has any prepayment penalty or early-payoff fee.
- Keep making the required monthly payment until the lender confirms the loan is closed.
- Request an official payoff quote before the final payment; it may include interest through a specific date.
- Confirm that automatic payments stop after the account is paid and closed.
Choosing an amount
How much extra should you pay each month?
Choose an amount you can sustain without missing required payments or draining money needed for essential expenses. Even a modest recurring extra payment reduces principal earlier, which generally lowers later interest. Compare several amounts in the calculator and look at both months saved and interest saved.
Paying off a low-rate auto loan early is not always the only priority. The right choice depends on your cash needs, other debts, emergency savings and loan terms. This page provides calculation help, not individualized financial advice.