Auto Loan Calculator

Estimate your real monthly car payment. Start from the vehicle price and subtract your down payment and trade-in, add sales tax, then see the payment, total interest, and total cost over the loan term.

Your details

Vehicle price$Sticker/negotiated price before tax.Down payment$Cash you pay up front.Trade-in value$Credit for your old vehicle. In most states it also lowers the taxable amount.Sales tax%State/local sales tax on the price net of trade-in.APR%Loan term

Monthly payment

$635.62

Amount financed: $32,100.00
Sales tax: $2,100.00
Total interest: $6,037.11
Total cost (with down payment): $43,137.11

Financed amount vs interest vs tax

Amount financed: $32,100.0080%
Interest: $6,037.1115%
Sales tax: $2,100.005%

Monthly payment$635.62

Formula

Sales tax = (price − trade-in) × tax rate. Amount financed = price − down payment − trade-in + sales tax. The monthly payment then amortizes that amount at the APR over the term: M = P·r(1+r)^n / ((1+r)^n − 1).

Frequently asked questions

Does a trade-in reduce my sales tax?⌄

In most US states, yes — sales tax applies to the price after the trade-in credit. A few states tax the full price; check your state's rules.

Should I choose a longer term?⌄

A longer term lowers the monthly payment but increases total interest, and can leave you owing more than the car is worth. Compare the total cost across terms.

Sources & methodology

Sales tax is applied to the price net of trade-in (typical US rule). Estimates only — dealer fees and registration are not included.

•Consumer Financial Protection Bureau — auto loans — CFPB

Last updated: 2026-07-20

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By state

State-specific versions with local tax rates prefilled.

Learn more

APR vs Interest Rate: What's the Difference?APR vs interest rate explained: what each measures, why APR is usually higher, and how to compare loan offers correctly.Auto Loans: How to Get the Best DealHow to finance a car smartly: price vs payment, down payment, trade-in, sales tax, term length, and credit score.How Car Lease Payments Work (Money Factor Explained)Car lease payments explained: depreciation, finance charge and tax, how the money factor converts to APR, and what residual value means.

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