How the auto loan calculator works
Enter the car's price, sales tax rate, down payment or trade-in value, APR, and term. The calculator adds tax to the price, subtracts your down payment to find the amount financed, then estimates the monthly payment with standard amortization. Adjust any input to see how each choice changes the cost.
Worked example: a $32,000 car at 7% APR
Take a $32,000 car with 6% sales tax and a $4,000 down payment. Tax adds $1,920, so after the down payment you finance $29,920. At 7% APR over 60 months, the calculator gives a monthly payment of $592.45. A bigger down payment or a shorter term would shrink the payment and the total interest.
Auto loan costs to watch out for
Dealer financing can bundle warranties and add-ons into the loan without itemizing them. A low payment on a 72- or 84-month term can mean thousands more in interest and owing more than the car is worth. Get preapproved first, then compare against the dealer's offer. Estimates only — not financial advice.
How much car can you afford
Many buyers use the 20/4/10 rule: at least 20% down, a term no longer than 4 years, and car costs under 10% of gross income. Plug a payment target into the calculator and work backward to the price that fits, instead of a salesperson stretching the term.
Frequently asked questions
Does the calculator include sales tax?
Yes. Enter your local tax rate and the calculator adds it to the purchase price before subtracting your down payment. Tax rates differ by state and sometimes by city or county, so confirm your local rate for the most realistic estimate. Title and registration fees are not included.
Should I get preapproved before visiting a dealer?
Usually yes. A preapproval from a bank or credit union gives you a baseline rate to beat and turns you into a cash-equivalent buyer. Dealers can sometimes beat your rate through their lending partners, so bring the preapproval and let them compete. Either way, compare total cost, not just the monthly payment.
Is a longer auto loan term ever a good idea?
Longer terms lower the payment but raise total interest and keep you underwater longer, meaning you owe more than the car's resale value. A shorter term usually costs less overall. Only stretch the term if a shorter payment genuinely breaks your budget, and avoid rolling negative equity from a trade-in into the new loan.
What credit score gets the best auto loan rates?
The lowest advertised rates typically go to scores of 720 and above, with rates rising as scores fall. Subprime borrowers can face rates several times higher. Your actual offer depends on the lender, loan length, and vehicle age too. Entering your real quoted rate keeps the calculator's estimate honest.