Auto Loan Calculator

How to Use This Auto Loan Calculator

Enter the vehicle price (the agreed purchase price before taxes), your planned down payment, the value of any trade-in vehicle (enter 0 if you don't have one), the loan term in months, and the annual interest rate (APR) your lender has quoted. If your state collects sales tax on vehicle purchases, enter that rate too. Click Calculate Auto Loan Payment and your monthly payment, total cost, and a full year-by-year breakdown appear instantly — free, with no account required.

What Determines Your Monthly Car Payment

Your monthly auto loan payment is driven by four factors: the loan amount (vehicle price minus down payment and trade-in, plus any financed sales tax), the interest rate, the loan term, and the standard amortization formula. Understanding how each variable moves your payment gives you real negotiating power:

• Larger down payment: Directly reduces the loan amount — every extra $1,000 down typically lowers the monthly payment by $15–25 depending on your rate and term.
• Shorter loan term: Higher monthly payment but dramatically less total interest paid. A 48-month loan at 7% costs significantly less than 72 months at the same rate, even though the monthly payment is higher.
• Lower interest rate: Half a point difference on a $30,000 loan over 60 months saves roughly $400 in total interest. Shopping rates aggressively pays off.
• Trade-in value: Reduces your loan amount just like a down payment. Knowing your trade-in's fair market value before negotiating gives you leverage.

What Is a Good Interest Rate for an Auto Loan?

Auto loan rates vary widely based on your credit score, loan term, vehicle age, and lender. As a reference for 2024:

• Excellent credit (750+): New car rates typically 5–7%; used car rates 7–10%.
• Good credit (700–749): New car rates 7–9%; used car rates 9–12%.
• Fair credit (600–699): New car rates 10–14%; used car rates 12–18%.
• Poor credit (below 600): Rates can exceed 18–25%. Improving your credit score before applying or saving a larger down payment can significantly reduce costs.

Credit unions typically offer rates 1–3% lower than traditional banks or dealer financing. Getting pre-approved from your bank or credit union before visiting a dealership gives you a baseline rate to negotiate against. Dealer financing can be competitive, but it's rarely the best rate available.

Loan Term: The Hidden Cost of Long-Term Loans

The most common mistake car buyers make is optimizing for the monthly payment rather than total cost. Long loan terms (72 or 84 months) produce lower monthly payments but cost far more in total interest and create significant negative equity risk.

Consider a $30,000 loan at 7% APR:

• 48 months: ~$718/month — Total interest: ~$4,464
• 60 months: ~$594/month — Total interest: ~$5,640
• 72 months: ~$511/month — Total interest: ~$6,792
• 84 months: ~$452/month — Total interest: ~$7,968

The 84-month loan costs over $3,500 more in interest than the 48-month loan and leaves you making payments on a vehicle that may be worth significantly less than what you owe. Financial advisors generally recommend keeping auto loan terms at 48–60 months maximum.

Understanding Loan-to-Value (LTV)

Loan-to-value is the ratio of your loan amount to the vehicle's purchase price. A higher LTV means you're financing more of the car's value, which increases risk for both you and the lender. Most lenders prefer an LTV below 100% — meaning you owe less than the car is worth.

New cars depreciate 15–25% in the first year. If you finance 90–100% of the purchase price with a long loan term, you're likely "underwater" (owing more than the car's value) for the first 2–3 years. A meaningful down payment and a shorter loan term minimize this risk. If your car is totaled while you're underwater, gap insurance covers the difference between what you owe and what insurance pays out.

Should You Finance or Pay Cash?

If you have the cash available and the loan rate is higher than what you'd earn investing that money, paying cash is mathematically superior. However, low auto loan rates (under 5%) often make financing attractive even when you have cash, since that money may earn more invested elsewhere. The decision depends on your current interest rate environment, your investment returns, and how much you value liquidity. Use this calculator to understand the true cost of financing, then compare it against your alternatives.