How the auto loan calculator works
Your monthly car payment depends on four things: how much you finance, your interest rate (APR), the length of the loan, and any tax and fees rolled in. This calculator brings them together. Enter the vehicle price, your down payment and trade-in, your state sales tax, and the loan term — it returns your monthly payment, the total interest, and the full amount you'll pay over the life of the loan.
The amount you actually finance is the sticker price minus your down payment and trade-in, plus sales tax and dealer fees. That financed amount is then amortized across your term at your APR.
What affects your car payment most
- Loan term: A longer term lowers the monthly payment but increases total interest. A 72- or 84-month loan can cost thousands more than a 48- or 60-month loan.
- APR: Your rate is driven by your credit score. Shopping lenders (banks, credit unions) before visiting the dealer often beats dealer financing.
- Down payment & trade-in: More money down means a smaller loan and less interest — and helps you avoid being "upside down" (owing more than the car is worth).
Tips before you sign
- Get pre-approved for a rate so you can negotiate the car price separately from financing.
- Focus on the total cost, not just the monthly payment — dealers can lower the payment by stretching the term.
- Aim to keep the loan term at 60 months or less when you can.
- Check whether your state taxes the price after the trade-in credit — it can reduce the tax you finance.