How is a car loan payment calculated?

A car loan payment is calculated using the formula: M = P[r(1+r)^n] / [(1+r)^n - 1], where P is the loan amount (vehicle price minus down payment and trade-in), r is the monthly interest rate, and n is the number of monthly payments. Sales tax is typically added to the vehicle price before calculating the loan amount.

How long should a car loan be?

Financial experts recommend car loan terms of 48 to 60 months (4-5 years) maximum. Longer terms like 72 or 84 months lower your monthly payment but significantly increase total interest paid and risk being underwater on the loan. The 20/4/10 rule suggests 20% down, 4-year maximum term, and payments under 10% of income.

Should I make a down payment on a car?

Yes, making a down payment of at least 20% is recommended. A larger down payment reduces your loan amount, lowers monthly payments, reduces total interest paid, and helps prevent being upside-down on the loan. It also often qualifies you for better interest rates.

Auto Loan Calculator

Calculate car loan payments and total cost

Vehicle Price ($)

Down Payment ($)

Trade-In Value ($)

Sales Tax (%)

Interest Rate (APR %)

Loan Term

Monthly Payment

Loan Amount

Vehicle Price
Sales Tax
Down Payment
Trade-In Value
Total Loan Amount
Total Interest Paid
Total Cost of Car

Payoff Timeline

Your car will be paid off in

Auto Loan Tips

20/4/10 Rule: 20% down, 4-year loan max, 10% of income for payments
Shorter terms save money: Higher payments but less interest overall
Check your credit score: Better scores get lower interest rates
Compare offers: Get quotes from multiple lenders
Consider total cost: Factor in insurance, fuel, and maintenance

Financial Disclaimer

This calculator provides estimates for informational purposes only. Actual auto loan terms, rates, and payments may vary based on creditworthiness, vehicle type, and lender policies. For accurate loan information, please consult with qualified financial advisors or loan officers. TopCalculatorOnline is not responsible for any financial decisions made based on these calculations.

How This Auto Loan Calculator Works

Our free Auto Loan Calculator helps you estimate your monthly car payment before you visit the dealership. Enter your vehicle price, down payment, trade-in value, sales tax rate, interest rate, and loan term to see your exact monthly payment, total interest cost, and payoff date.

The calculator accounts for all the factors that affect your car loan: the sticker price, sales tax (which is often financed), your down payment and trade-in value, the APR from your lender, and your chosen loan length. This gives you a realistic picture of what you will actually pay each month.

Auto Loan Formula

The monthly car payment formula is the same as any amortizing loan:

Payment = Loan × r × (1 + r)ⁿ / ((1 + r)ⁿ − 1)

Where Loan = (Vehicle Price + Sales Tax) − Down Payment − Trade-In Value, r = monthly interest rate (APR ÷ 12 ÷ 100), and n = number of monthly payments.

Example: $35,000 Car Loan

Parameter	Value
Vehicle Price	$35,000
Sales Tax (7%)	$2,450
Down Payment	$5,000
Loan Amount	$32,450
Interest Rate (APR)	6.5%
Loan Term	60 months (5 years)
Monthly Payment	$634.79
Total Interest Paid	$5,637.40
Total Cost of Car	$43,087.40

Frequently Asked Questions

A car loan payment is calculated by taking the total loan amount (vehicle price plus sales tax, minus down payment and trade-in), applying the monthly interest rate, and spreading it over the number of monthly payments using the standard amortization formula. Our calculator does all this math instantly.

Good car loan interest rates depend on your credit score and whether the car is new or used. For new cars, excellent credit may qualify for 3-5% APR, while used cars typically have rates 1-2% higher. Always compare offers from banks, credit unions, and dealer financing to find the best rate.

While longer terms (72-84 months) lower your monthly payment, they significantly increase total interest paid and risk being "underwater" on your loan (owing more than the car is worth). Financial experts recommend 48-60 month terms. Use this calculator to compare different term lengths and see the interest difference.

A trade-in reduces your loan amount just like a down payment. The value of your trade-in vehicle is subtracted from the purchase price, which lowers your monthly payment and total interest paid. Get your trade-in appraised independently before visiting the dealership for the best deal.

Related tools: Loan EMI Calculator for general loans, Mortgage Calculator for home loans, or Budget Planner to manage your finances.

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