Auto Loan Calculator - Payment and Total Cost

An auto loan calculator estimates the monthly principal-and-interest payment and the broader cost of financing a vehicle. Enter a negotiated vehicle price, trade-in value, cash down payment, sales tax rate, financed fees, annual interest rate, and loan term to see the amount financed, total interest, total vehicle cost, and down-payment percentage. Use it before visiting a dealer, comparing a bank or credit-union offer, checking a used-car budget, or deciding whether a longer term fits your cash flow.

• • Plan a purchase budget: Test a realistic vehicle price and upfront cash amount before a salesperson frames the discussion around a monthly payment.
• • Compare loan offers: Hold the vehicle assumptions constant while changing rate or term so the interest and total-cost difference is visible.
• • Value a trade-in: See how a trade-in credit changes the taxable amount and the principal you need to finance.
• • Check taxes and fees: Add purchase costs to avoid comparing a headline vehicle price with a lender's amount-financed figure.

This page models a fully amortizing loan with a fixed nominal annual rate and monthly payments. It is a planning estimate, not a lender quote; a contract may use different tax, interest, rebate, or fee treatment.

Use this auto loan calculator when the deal includes a trade-in, sales tax, and financed fees. For a simpler principal-and-interest comparison, the related car loan payment calculator removes those vehicle-specific assumptions.

For a simpler principal-and-interest view without vehicle-specific tax assumptions, the Car Loan EMI Calculator is a useful comparison.

The calculator first builds the financed amount, then converts the annual rate and term into monthly assumptions. It applies a fixed-payment amortization formula, with a separate zero-rate branch so a promotional 0% scenario does not divide by zero.

• P: Amount financed after the trade-in and cash down payment, plus the sales tax and fees entered.
• r: Monthly decimal rate, equal to the annual interest rate divided by 100 and then by 12.
• n: Number of scheduled monthly payments, equal to loan-term years multiplied by 12.
• M: Fixed monthly principal-and-interest payment before any costs not included in the model.

The sales-tax assumption is vehicle price less trade-in value, clamped at zero. Tax rules differ by state, so replace the default rate with the basis on your purchase worksheet. Fees are separate because title, registration, documentation, and dealer charges vary.

Total vehicle cost adds price, tax, fees, and modeled interest, then subtracts the trade-in credit. Cash down reduces the financed balance and scheduled payments, so it is not added twice. Results are rounded only after calculation.

According to OpenStax Principles of Finance, OpenStax shows that a fixed-rate auto loan uses the present-value-of-an-annuity formula, divides the annual rate by 12, multiplies years by 12, and illustrates a $32,000 three-year loan at 6% with an approximately $973.50 monthly payment.

When you need payment-by-payment principal and interest detail, the Amortization Calculator extends this monthly estimate into a full schedule.

Four terms explain why two offers with the same vehicle price can produce different payments. Read the amount financed and total interest together instead of treating the monthly figure as the whole deal.

A down payment and trade-in are not interchangeable in every contract. Both can reduce principal, but trade-in tax treatment depends on jurisdiction and an existing lien may be handled separately. Ask for the itemized out-the-door price and amount financed.

The calculator uses your entered rate, not a live rate table. Credit history, vehicle age, lender, incentives, collateral, and market conditions can change the offered rate.

The Loan Payment Calculator helps isolate the fixed-rate payment formula when you want to compare the vehicle loan with another installment debt.

Use this auto loan calculator with figures from a written buyer's order or lender quote when possible. Change one assumption at a time so you can identify what moved the payment.

1. 1 Enter the vehicle price: Start with the negotiated purchase price, not the monthly payment advertised in a promotion.
2. 2 Add trade-in and cash down: Enter the trade-in credit and the cash you will pay at signing. If an existing lien creates negative equity, verify the resulting amount financed before entering it.
3. 3 Enter tax and fees: Use the applicable sales-tax rate and add documentation, title, registration, or other charges that will be financed.
4. 4 Set rate and term: Enter the fixed annual interest rate and the term in years from the lender's offer. Try a shorter term as a comparison.
5. 5 Review every result: Check the amount financed, monthly payment, sales tax, total interest, total vehicle cost, and down-payment percentage before deciding which scenario fits.

Suppose a dealer quotes a $28,000 used car, a $4,000 trade-in, $2,000 down, 6.5% interest, $700 fees, 7% tax, and 60 months. Enter each figure, note the baseline payment, then rerun with 48 months. The shorter term may raise the monthly payment, but the total-interest line shows the cost of borrowing less time.

If you are still choosing a vehicle price, the Car Affordability Calculator can frame a purchase budget before you test financing terms.

A useful financing comparison shows both the payment due each month and the dollars committed over the full schedule. These outputs support a conversation with a lender without pretending to replace the contract.

• • See the out-the-door impact: Taxes and financed fees are visible instead of disappearing behind a vehicle sticker price.
• • Separate principal from interest: The amount-financed and total-interest lines show how much is borrowed versus paid for borrowing.
• • Test cash-down choices: Change the down payment to weigh a lower balance against the cash you want to keep available.
• • Compare term tradeoffs: Run 48, 60, and 72 months to see whether a lower payment is worth a higher scheduled interest cost.
• • Prepare negotiation questions: Use the itemized assumptions to ask why a quote's rate, fees, or amount financed differs from the written offer.
• • Budget beyond the payment: Keep room for insurance, fuel, maintenance, parking, and other ownership costs that this loan model does not finance.

Keep vehicle and tax assumptions fixed while changing only the financing choice. If payment and total interest both matter, record each scenario rather than selecting the smallest monthly number.

A lease has depreciation, residual value, mileage, rent charge, and end-of-term conditions, so it requires a different model.

The Lease Calculator provides a different cost model when leasing is an alternative to buying the vehicle with an auto loan.

The result changes when either the vehicle deal or the financing contract changes. The following factors are the levers to test first when a lender's quote does not match your budget.

• • The model assumes one fixed nominal rate, monthly payments, and a fully amortizing balance. It does not model variable rates, skipped payments, late charges, daily simple interest, balloon balances, or lender-specific rounding.
• • The sales-tax base and trade-in treatment vary by state and contract. The estimate does not include insurance, fuel, maintenance, warranties, GAP coverage, registration renewals, or depreciation.
• • Use the final Truth in Lending disclosure and lender payoff figure for a binding decision. The APR may include eligible finance charges that are not represented by the rate and fees entered here.

Consumer guidance emphasizes comparing total paid, not only the monthly payment. A 72-month offer can look easier while costing more interest and extending the period in which the vehicle secures the debt.

If your trade-in is not paid off, ask for payoff, trade value, negative equity, and new amount financed as separate lines.

According to Consumer Financial Protection Bureau, The Consumer Financial Protection Bureau explains that a down payment reduces the amount borrowed, a longer term can lower the monthly payment but increase lifetime interest, and APR includes loan fees while an interest rate does not.

For an existing balance or trade-in payoff question, the Car Loan Payoff Calculator helps estimate what remains before you replace the vehicle.