The Auto Loan Calculator computes monthly car loan payments from vehicle price, down payment, trade-in value, interest rate, term, and sales tax. Returns monthly payment, total interest paid, total cost, and amortization summary — essential before negotiating at any dealership.
$32,100.00
$619.09
$37,145.48
$5,045.48
$42,145.48
$32,100.00
$619.09
$37,145.48
$5,045.48
$42,145.48
Dealerships love to negotiate on monthly payment — because it obscures the total cost of the car. Knowing exactly what your monthly payment should be before you walk in changes the conversation entirely. The calculator for auto loans computes your monthly payment from the actual loan parameters and shows the total interest cost that makes a long term far more expensive than it appears from the monthly payment alone.
Monthly payment for a standard amortizing auto loan:
PMT = P × [r(1+r)^n] / [(1+r)^n − 1]
where P = loan amount (vehicle price + taxes + fees − down payment − trade-in), r = monthly interest rate (annual rate / 12), and n = number of monthly payments. The loan amount calculation: P = (Vehicle price × (1 + sales tax rate)) − Down payment − Trade-in value + Documentation fees. For a USD 30,000 car at 6.5% APR for 60 months with USD 5,000 down and no trade-in at 6% tax: P = (30,000 × 1.06) − 5,000 = USD 26,800; r = 0.065/12 = 0.005417; PMT = USD 522.23/month; total interest = (522.23 × 60) − 26,800 = USD 4,534. Use this online calculator for any auto loan scenario. The auto lease calculator provides the leasing alternative comparison.
Extending the loan term reduces monthly payments but dramatically increases total interest cost:
An 84-month loan on a 7-year-old car at the end of the term will likely have repair costs exceeding the remaining payment savings. Financial advisors generally recommend auto loans no longer than 60 months; the Consumer Financial Protection Bureau warns that 84-month loans often create negative equity situations ("underwater" loans).
Dealers typically offer financing through captive lenders (manufacturer's finance arm) or third-party banks, and commonly mark up the interest rate above the "buy rate" they receive — keeping the difference as profit. This dealer reserve can add 1–2% to your rate without your knowledge. Strategies to avoid overpaying on financing:
The auto refinance calculator and loan calculators provide the complete vehicle financing toolkit.
Every dollar of down payment or trade-in value reduces the loan principal dollar-for-dollar, saving interest over the entire loan term. A USD 2,000 larger down payment on a 60-month 6.5% loan saves approximately USD 340 in interest. However, putting cash into a depreciating asset is not always the optimal financial decision — if you can earn more than 6.5% on invested capital, the math may favor a smaller down payment. The personal finance trade-off between minimizing loan interest and maintaining liquid savings depends on your emergency fund status and investment opportunities.
Loan Amount = Vehicle Price + Sales Tax − Down Payment − Trade-In. Sales tax is computed on (Vehicle Price − Trade-In) in most states.
Monthly Payment = Loan × r × (1+r)^n / ((1+r)^n − 1), where r = annual rate / 12 / 100, n = term in months.
Total Interest = (Monthly Payment × n) − Loan Amount. Total Vehicle Cost = Total Payment + Down Payment + Trade-In.
Compare the total cost (not just monthly payment) across different terms. A 72-month loan has lower payments but can cost $2,000-$5,000 more in interest than a 48-month loan. Also consider that longer loans increase the risk of being 'underwater' — owing more than the vehicle is worth.
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Results
$35,000 car with $5K down, $3K trade-in, 5.9% rate for 60 months. Monthly payment: $558.
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Results
$18,000 used car with $2K down, 7.5% rate for 48 months. Total interest: $2,718.
Monthly Payment = Loan Amount × r × (1+r)^n / ((1+r)^n − 1), where Loan Amount = Vehicle Price + Tax − Down Payment − Trade-In, r is the monthly rate, and n is the number of payments.
As of 2025-2026, good rates are 4-6% for new cars (excellent credit) and 5-9% for used cars. Rates above 10% are considered high. Credit unions often offer the best auto loan rates.
A 60-month loan costs less in total interest and builds equity faster. A 72-month loan has lower monthly payments but costs $1,000-$5,000 more in interest and increases the risk of negative equity.
Financial experts recommend 20% for a new car and 10% for a used car. A larger down payment reduces your loan amount, monthly payment, total interest, and risk of being underwater.
In most US states, yes — sales tax is calculated on the vehicle price minus trade-in value, saving you tax. However, a few states (California, Hawaii, etc.) tax the full purchase price regardless of trade-in.
Get pre-approved by your bank or credit union first, then compare the dealer's offer. Dealer financing sometimes offers promotional rates (0-2.9%) on new cars but may charge more on used vehicles.
Negative equity means you owe more on the loan than the car is worth. This commonly happens with small down payments and long loan terms because cars depreciate 15-25% in the first year.
Yes, auto loan refinancing can lower your rate if your credit has improved or rates have dropped. Typically, you need at least 6 months of payment history and the car must meet age/mileage requirements.
Yes. Common additional fees include documentation fees ($100-$700), registration/title fees, and dealer add-ons. These may or may not be included in your financed amount.
Credit scores above 750 get the best rates (often under 5%). Scores of 650-749 may see 6-9%. Below 650, expect 10-20%+. The rate difference on a $30,000 loan can mean $3,000-$8,000 in extra interest.
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