Contact

Auto Loan Calculator

Payment, total interest and state sales tax.

🚗 Auto Loan Calculator
Estimated monthly payment
Amount financed
Total interest
Total of payments

How to Use

  1. Enter the vehicle price.
  2. Add your down payment and any trade-in value.
  3. Enter your state sales tax rate and the APR your lender quoted.
  4. Choose a loan term. Your monthly payment updates instantly.

Calculation Method

We use the standard amortized loan payment formula:

M = P · [ r(1+r)^n ] / [ (1+r)^n − 1 ]

where P = amount financed (price − down − trade-in + sales tax), r = APR ÷ 12, n = term in months. Sales tax is applied to price minus trade-in (typical in most states).

Examples

$35,000 car, $5,000 down, 7.5% APR, 5 years

Financing about $32,250 (incl. sales tax) results in roughly $646/month and about $6,500 in total interest.

Frequently Asked Questions

In most states you can roll sales tax into the loan. This calculator adds sales tax (on price minus trade-in) to the financed amount.
Yes. A larger down payment reduces the amount financed, which lowers both your monthly payment and total interest.
Rates depend heavily on your credit score and whether the car is new or used. Borrowers with excellent credit see the lowest APRs.
A longer term lowers the monthly payment but increases total interest paid. Pick the shortest term you can comfortably afford.

Related Tools

💵

Personal Loan Calculator

Monthly payment and total cost.
🏢

Business Loan Calculator

SBA, term loans and cash-flow impact.
🎓

Student Loan Repayment Calculator

Standard, income-driven and forgiveness.
🔄

Student Loan Refinance Calculator

Savings and break-even point.

Related Guides

Disclaimer

Calculations are estimates based on the information you provide. Actual loan terms, rates, and payments vary by lender, credit score, and other factors. SmartLoanCalcs is not a lender and this is not a loan offer. We are not responsible for decisions made based on these calculations — consider consulting a licensed lender or financial advisor.

Last updated: May 24, 2026