Auto Loan Extra Principal Payment Calculator

Paying extra principal on your auto loan can significantly reduce your interest costs and pay off your loan faster. This calculator helps you determine how much you'll save by making additional payments and shows you the amortization schedule.

How to Use This Calculator

Enter your loan details and the amount of extra principal you want to pay each month. The calculator will show you:

Total interest saved
Loan payoff date
Amortization schedule
Interest vs. principal breakdown

Use this information to decide if extra principal payments make sense for your financial situation.

How Extra Principal Payments Work

When you make extra principal payments on your auto loan, you're paying down the principal balance faster than the minimum required payment. This reduces the total interest you'll pay over the life of the loan.

Formula Used

The calculator uses the following formula to determine the new loan payoff date:

New Payoff Date = Original Payoff Date - (Extra Principal / Monthly Payment)

For example, if your original loan payoff date is 60 months and you make $200 extra principal payments each month, you'll pay off the loan in:

60 - (200 / $500) = 56 months

The calculator also shows you the amortization schedule, which breaks down how much of each payment goes toward principal and how much goes toward interest.

Worked Example

Let's say you have a $20,000 auto loan with a 5% APR and a 60-month term. Your minimum monthly payment is $427.33. If you make $200 extra principal payments each month:

Metric	Original Loan	With Extra Payments
Total Interest Paid	$3,820	$1,820
Interest Saved	-	$2,000
Payoff Date	5 years	4 years, 8 months

By making $200 extra principal payments each month, you'll save $2,000 in interest and pay off your loan 10 months earlier.

Frequently Asked Questions

Can I make extra principal payments on any auto loan?: Most auto loans allow extra principal payments, but check your loan agreement to confirm. Some loans may have restrictions on extra payments.
Will making extra principal payments hurt my credit score?: No, making extra principal payments will not hurt your credit score. In fact, it can help improve your credit utilization ratio.
How often can I make extra principal payments?: You can make extra principal payments as often as you want, but they must be in addition to your regular monthly payment.
Can I make extra principal payments online?: Yes, most lenders allow you to make extra principal payments online through your loan account.
What happens if I miss a payment with extra principal?: If you miss a payment, you'll owe the full amount plus any late fees. Your lender may also charge you a prepayment penalty.