Auto Loan Calculator
Estimate your monthly car payment, total interest, and the real cost after tax and fees.
Your numbers
Monthly payment
- Loan amount
- $25,000.00
- Sales tax (financed)
- $0.00
- Total interest
- $3,999.20
- Total of payments
- $28,999.20
A car loan turns a big one-time price into a manageable monthly payment — but the way it's structured determines how much that convenience costs. Understanding the moving parts helps you negotiate a better deal and avoid the most common trap: chasing a low payment into a much bigger total cost.
What you're actually financing
The amount you borrow isn't just the sticker price. It's:
Loan amount = vehicle price + sales tax + fees − down payment − trade-in
Sales tax is usually charged on the price net of your trade-in in most US states, which is one reason a trade-in can save you more than its face value. Title, registration, and dealer fees are typically rolled into the loan too.
What sets your monthly payment
Four levers move your payment:
- Loan amount — a bigger down payment or trade-in shrinks it directly.
- Interest rate (APR) — driven by your credit score and the lender.
- Term — how many months you spread it over.
- The math — the loan is amortized, so early payments are mostly interest and later ones mostly principal.
Take a $25,000 loan at 6% APR over 60 months: the payment is about $483/month, and you'll pay roughly $4,000 in interest over the life of the loan. The Auto Loan Calculator shows this for your exact price, rate, and term.
The long-term trap
Stretching a loan to 72 or 84 months lowers the monthly payment — which is exactly why dealers offer it. But a longer term means:
- More total interest, because you owe the balance for longer.
- Negative equity ("underwater") risk — the car depreciates faster than you pay down the loan, so you owe more than it's worth.
A lower payment can hide a worse deal. Always compare the total interest, not just the monthly number — the calculator shows both.
How to pay less for your car
- Put more down to shrink the loan and the interest on it.
- Choose the shortest term you can afford — the payment is higher but the total cost is far lower.
- Improve your rate by checking your credit and getting pre-approved by a bank or credit union before visiting the dealer.
- Skip financed add-ons (extended warranties, paint protection) that inflate the loan and accrue interest.
- Negotiate the price, not the payment — dealers can hit a target monthly payment by lengthening the term while keeping the price high.
The bottom line
Your car payment is set by the loan amount, rate, and term — and the term is where buyers lose the most money. Put more down, keep the term short, secure your own financing, and compare total interest across scenarios in the Auto Loan Calculator before you sign. Rates and tax rules vary, so confirm the specifics for your state and lender.
Frequently asked questions
How is a car loan payment calculated?
It’s an amortized loan: the financed amount (price + tax + fees − down − trade-in) is spread over the term using the interest rate. A $25,000 loan at 6% over 60 months works out to about $483/month.
Does a longer loan term mean a lower payment?
Yes — but it also means more total interest and a higher risk of owing more than the car is worth. A 72- or 84-month loan lowers the monthly payment while raising the total cost. Compare total interest, not just the monthly number.
Is sales tax included in a car loan?
Usually yes — sales tax and registration fees are typically financed into the loan. In most US states the tax is calculated on the price after your trade-in is deducted, which can save you a meaningful amount.
How much should I put down on a car?
A common guideline is 20% down on a new car (less on used), but more is better: a larger down payment shrinks the loan, lowers your payment and interest, and reduces the chance of going underwater as the car depreciates.
Does my credit score affect my car loan?
Significantly. Your credit score is the main driver of your APR, and the rate gap between excellent and poor credit can be several percentage points — translating to thousands of dollars over the loan. Check your score and get pre-approved before shopping.
Should I get financing from the dealer or a bank?
Get pre-approved by your bank or credit union first, then let the dealer try to beat it. Having an outside offer gives you leverage and protects you from being steered into a higher rate or a longer term than you need.
What does being "underwater" on a car loan mean?
It means you owe more on the loan than the car is currently worth — common early in long loans because cars depreciate fast. A bigger down payment and a shorter term are the best ways to avoid it.
How can I lower my car payment?
Put more down, choose a shorter term (the payment is higher but total cost is lower), improve your rate with better credit or outside financing, skip financed add-ons, and negotiate the vehicle price rather than the monthly payment.