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Calculate your car loan payment with sales tax, trade-in, fees, and total interest.
See your monthly car payment with sales tax, trade-in value, fees, and total interest cost.
Monthly Payment
$656.74
60 months at 7.5% APR
Amount Financed
$32,775
Total Interest
$6,630
Sales Tax
$2,275
Total Out-of-Pocket
$44,405
Lender tip
The auto-industry "20/4/10" rule: put 20% down, finance for no more than 4 years, and keep total transportation under 10% of gross income. A 72-month loan can lower the payment but doubles interest cost vs 48 months.
Auto Loan Calculator computes your monthly car payment using the standard PMT formula, including sales tax rolled into principal, trade-in value, and total interest over the loan term.
See your real monthly car payment with sales tax, trade-in value, registration fees, and total interest over the loan term.
Enter the vehicle price and your down payment.
Add trade-in value, sales tax %, and fees.
Pick a loan term to see monthly payment and total cost.
Monthly payment uses the standard PMT annuity formula: P × r × (1+r)^n / ((1+r)^n − 1), where r = monthly rate and n = term months. Sales tax is added to the vehicle price before subtracting down payment and trade-in. Total interest = (monthly payment × months) − principal financed.
A 72-month loan lowers monthly payments but dramatically increases interest. The 20/4/10 rule suggests no more than 48 months to avoid being upside down (owing more than the car's value).
In most US states, yes — sales tax can be rolled into the loan amount. This calculator includes the tax in the financed principal by default.
Trade-in value reduces the financed principal dollar-for-dollar, and in most states also reduces the sales tax basis (you only pay tax on the difference).
As of mid-2026, new car loan APRs average ~7.0–8.0% for prime credit, with subprime borrowers seeing 12–18%. Used car APRs run 1–2 percentage points higher.
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