Car Loan Calculator

Before you sign at the dealership, know your real monthly payment. Factor in trade-in value, sales tax, and fees to see the full amortization schedule — no surprises at signing.

What is Car Loan Calculator?

A car loan calculator is an essential tool for anyone planning to finance a vehicle purchase. It helps you understand the true cost of your auto loan by factoring in the car price, down payment, trade-in value, interest rate, loan term, sales tax, and dealer fees.

Buying a car is one of the largest purchases most people make, and financing it properly can save you thousands of dollars. Many buyers focus only on the monthly payment without considering how the loan term, interest rate, and additional costs affect the total price. This calculator reveals the complete financial picture, helping you compare different financing options and negotiate better deals.

Formula

Monthly Payment = P × [r(1+r)^n] / [(1+r)^n - 1]

Where: P = Loan amount (car price + sales tax + fees - down payment - trade-in), r = Monthly interest rate (annual rate ÷ 12), n = Total number of payments (loan term in months)

Sales Tax = (Car Price - Trade-In Value) × Sales Tax Rate

How to Calculate

Enter the car's purchase price.
Input your planned down payment and trade-in value.
Add any dealer fees and your local sales tax rate.
Specify the loan term and interest rate.
Review your monthly payment, total interest, and overall cost.

Example

You want to buy a car priced at $30,000 with a $5,000 down payment and a $3,000 trade-in. With 7% sales tax, $500 in fees, and a 6.5% interest rate over 5 years: taxable amount is $27,000, sales tax is $1,890, loan amount is $24,390. Your monthly payment would be $478, total interest $4,290, and total cost $34,390.

Key Benefits

Know exact monthly payment before stepping into dealership
See total interest cost over full loan term
Compare financing from banks credit unions and dealers
Factor trade-in and down payment for true loan amount

Common Mistakes to Avoid

Focusing on monthly payment instead of total price
Negotiating payment rather than out-the-door price
Not checking credit score determining your rate

Pro Tips

Get pre-approved from credit union before dealer
Keep auto loans to 48 months or less
Put 20 percent down to avoid upside-down loan

Key Terms Explained

APR: True yearly cost including fees
Down Payment: Upfront cash reducing loan
Loan Term: Repayment period 36-72 months
Negative Equity: Owing more than vehicle value

Common Use Cases

Comparing auto loan offers from banks, credit unions, and dealerships
Determining how much car you can afford within your budget
Evaluating the impact of different down payment and trade-in scenarios
Understanding the true cost of dealer financing vs. external financing

Frequently Asked Questions

What is a good interest rate for a car loan?

For new cars, rates typically range from 5% to 7% for borrowers with good credit. Used car loans usually have slightly higher rates, around 6% to 10%. Your rate depends on your credit score, loan term, and whether the car is new or used.

How much should I put down on a car?

Financial experts recommend putting down at least 20% for a new car and 10% for a used car. A larger down payment reduces your loan amount, monthly payments, and total interest paid over the life of the loan.

Should I include trade-in value in my down payment?

Yes. Your trade-in value reduces the amount you need to finance. In many states, you only pay sales tax on the difference between the car price and trade-in value, which can save you significant money.

What fees are included in a car loan?

Common fees include title and registration fees, documentation fees, dealer preparation fees, and destination charges. These typically range from $500 to $1,500 and can be rolled into your loan amount.

Is it better to choose a shorter or longer loan term?

A shorter term (36-48 months) means higher monthly payments but significantly less total interest. A longer term (60-72 months) lowers monthly payments but costs more overall. Choose the shortest term you can comfortably afford.