Auto Loan Overpayment Calculator

Use this calculator to determine how much you can save by making extra payments on your auto loan. By overpaying your loan, you can reduce the total interest paid and shorten the loan term.

How to Use This Calculator

To calculate your potential savings from overpaying your auto loan:

Enter your current loan balance in the "Loan Balance" field.
Input your current monthly payment in the "Monthly Payment" field.
Specify your current annual interest rate in the "Interest Rate" field.
Enter the number of months remaining on your loan in the "Remaining Term" field.
Input the amount you plan to overpay each month in the "Overpayment Amount" field.
Click the "Calculate" button to see your results.

The calculator will display the total interest saved, reduced loan term, and a comparison chart showing your original vs. overpaid payment schedule.

Formula Used

The calculator uses the following formulas to determine your savings:

// Original loan calculations originalTerm = remainingTerm; originalInterest = (loanBalance * (interestRate/100/12) * originalTerm) - (monthlyPayment * originalTerm); // Overpaid loan calculations overpaidTerm = Math.ceil((Math.log(monthlyPayment) - Math.log(monthlyPayment + (overpayment * (interestRate/100/12)))) / Math.log(1 + (interestRate/100/12))); overpaidInterest = (loanBalance * (interestRate/100/12) * overpaidTerm) - (monthlyPayment * overpaidTerm); // Savings calculations interestSaved = originalInterest - overpaidInterest; termSaved = originalTerm - overpaidTerm;

Where:

Loan Balance - The current amount owed on your auto loan
Monthly Payment - Your current regular monthly payment
Interest Rate - The annual interest rate on your loan
Remaining Term - The number of months remaining on your loan
Overpayment Amount - The additional amount you plan to pay each month

Worked Example

Let's say you have a $20,000 auto loan with a 5% annual interest rate. Your current monthly payment is $350, and you have 60 months remaining on your loan. If you decide to overpay $100 each month:

With the overpayment, you would pay off your loan in 48 months instead of 60, saving $450 in interest and $1,200 in total payments.

This example shows how even small overpayments can significantly reduce your loan term and interest costs.

Overpayment Strategies

There are several strategies you can use to overpay your auto loan:

Bi-weekly payments: Pay every two weeks instead of monthly. This effectively gives you 26 payments per year instead of 12.
Extra payments: Make additional payments when you receive a refund, tax return, or bonus.
Lump sum payments: Pay off a portion of your loan in a single lump sum payment.
Refinance: Consider refinancing your auto loan for a lower interest rate if rates have dropped significantly.

Each strategy has its own benefits and considerations, so choose the one that best fits your financial situation.

Frequently Asked Questions

How much can I save by overpaying my auto loan?

The amount you can save depends on your current loan balance, interest rate, remaining term, and the amount of your overpayment. Use this calculator to determine your specific savings potential.

Is it better to overpay my auto loan or refinance?

Overpaying your auto loan is generally more beneficial than refinancing if your current interest rate is low. However, if interest rates have dropped significantly, refinancing might be a better option to save more money in the long run.

Can I overpay my auto loan early?

Yes, you can make extra payments at any time. However, be aware that making large lump sum payments may result in a higher interest charge for the period during which the extra payment is applied.