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  4. Car Payment Calculator

Car Payment Calculator

Last updated: March 30, 2026

Calculate your monthly auto loan payment including sales tax, down payment, and trade-in value.

Results

Enter your details and click Calculate to see results.

Saved Presets is a Supporter feature.

Tool History is a Supporter feature.

Tool Notes is a Supporter feature.

Features

  • ▶Monthly payment calculation with standard formula
  • ▶Sales tax and fees included
  • ▶Trade-in value deduction
  • ▶Total interest and total cost breakdown
  • ▶Supports all loan terms from 12 to 84 months

How to Use This Tool

1

Enter Vehicle Price

Input the negotiated purchase price of the vehicle.

2

Add Down Payment

Enter how much cash you are putting down.

3

Enter Trade-In Value

Add your trade-in vehicle value if applicable.

4

Set Loan Terms

Choose interest rate, loan term, and local sales tax rate.

5

View Monthly Payment

See your estimated monthly payment and total cost.

Auto Loan Payment Formula

Monthly Payment = Loan Amount × [r(1+r)^n] / [(1+r)^n - 1], where r is the monthly interest rate and n is the number of payments. The loan amount is the vehicle price plus tax minus down payment and trade-in.

Sales Tax Impact

Sales tax is added to the vehicle price before calculating the loan amount. Tax rates vary by state and locality, typically ranging from 0% to 10%.

Total Cost vs Monthly Payment

While a longer loan term reduces monthly payments, it increases total interest paid. Compare both figures to find the best balance for your budget.

Frequently Asked Questions

A common guideline is to keep your monthly car payment under 15% of your gross monthly income. For a ,000 salary, that is about /month maximum.