Auto Loan Calculator with Interest and Taxes

This auto loan calculator estimates your monthly payments including both interest and taxes. Simply enter your loan amount, interest rate, loan term, and sales tax rate to get an accurate estimate of your total monthly payment and the total cost of your loan.

How to Use This Calculator

Using this auto loan calculator is simple:

Enter the loan amount (the total amount you're borrowing)
Enter the interest rate (annual percentage rate)
Enter the loan term (how many years you'll repay the loan)
Enter the sales tax rate (if applicable)
Click the Calculate button

The calculator will display your estimated monthly payment and the total amount you'll pay over the life of the loan.

Formula Used

The calculator uses the standard auto loan payment formula:

Monthly Payment = P * (r(1+r)^n) / ((1+r)^n - 1) Where: P = Principal loan amount r = Monthly interest rate (annual rate / 12) n = Number of payments (loan term in years * 12)

Taxes are calculated separately and added to the monthly payment.

Worked Example

Let's calculate a loan with these parameters:

Loan amount: $25,000
Interest rate: 5% APR
Loan term: 5 years
Sales tax: 8%

The calculator would:

Calculate the monthly interest rate: 5% / 12 = 0.4167%
Calculate the number of payments: 5 years * 12 = 60 months
Calculate the base monthly payment: $25,000 * (0.004167*(1+0.004167)^60) / ((1+0.004167)^60 - 1) ≈ $450.34
Calculate the tax amount: $25,000 * 0.08 = $2,000
Add the tax to the base payment: $450.34 + $2,000 = $2,450.34

This example shows that the total monthly payment would be approximately $2,450.34, with $2,000 going to taxes and $450.34 going to principal and interest.

Interpreting Results

When you get your results, pay attention to these key points:

Monthly Payment: This is what you'll pay each month
Total Interest: The total amount paid in interest over the life of the loan
Total Cost: The sum of the loan amount and total interest

Remember that these are estimates. Actual payments may vary based on your lender's specific terms and any additional fees.

Comparing different loan options can help you find the best deal. You might want to try different interest rates, loan terms, or down payments to see how they affect your monthly payments.

FAQ

How accurate is this auto loan calculator?

This calculator provides an estimate based on standard loan formulas. For precise figures, consult with your lender or use their official loan calculator.

Does this calculator include all fees?

No, this calculator only includes the principal, interest, and taxes. It doesn't account for origination fees, closing costs, or other fees that may apply.

How does sales tax affect my loan?

Sales tax is typically paid upfront and is added to the total loan amount. This calculator shows how much your monthly payment increases due to the tax.

Can I use this calculator for refinancing?

Yes, you can use this calculator to estimate your new payments if you're considering refinancing your auto loan.