How to Use This Calculator

Step 1: Enter your current loan balance. This is the amount you still owe, not the original loan amount. Check your latest statement or your lender’s app for the exact number.

Step 2: Enter the annual interest rate on your loan. This is the APR, not the monthly rate. You’ll find it on your loan agreement or any recent statement.

Step 3: Enter your current monthly payment. This is the amount you’re paying each month right now.

Step 4: Try adding an extra monthly payment amount. Start with $50 or $100 and see what happens to your payoff date and total interest. The results often shock people.

Why Extra Payments Make Such a Huge Difference

When you make your regular monthly payment, a chunk goes to interest and the rest goes to principal. Early in the loan, most of your payment is interest. That’s how amortization works and it’s designed to benefit the lender.

Extra payments go entirely toward principal. Every extra dollar you pay reduces the balance that interest is calculated on. So next month, a slightly larger portion of your regular payment goes to principal too. This creates a snowball effect that accelerates over time.

On a $25,000 car loan at 6.5% with a $450 monthly payment, adding just $100 extra per month pays off the loan about 14 months earlier and saves you over $900 in interest. Run your own numbers above and see what’s possible.

When It Makes Sense to Pay Extra on Your Loan

Paying extra on a loan makes the most sense when your interest rate is relatively high, say 5% or above. The higher the rate, the more interest you save by paying down principal early.

If your loan has a very low rate, like 2% or 3%, you might actually be better off investing the extra money instead. Historically, the stock market has returned around 7% after inflation. Putting money into investments earning 7% while carrying a 3% loan is a net positive mathematically. But there’s real psychological value in being debt free that numbers don’t capture.

One thing to check before making extra payments: make sure your loan doesn’t have a prepayment penalty. Most auto and student loans don’t, but some personal loans do. Read your loan agreement or call your lender to confirm.

Smart Ways to Find Extra Money for Loan Payments

Round up your payment. If your payment is $387, pay $400. You won’t miss the extra $13, but over years it shaves months off the loan.

Use the biweekly payment trick. Instead of 12 monthly payments, pay half the amount every two weeks. Because there are 52 weeks in a year, you end up making 26 half payments, which equals 13 full payments. One extra payment per year with zero extra effort.

Direct one-time windfalls at the loan. Tax refunds, work bonuses, cash gifts, selling old stuff. Any lump sum applied to principal moves your payoff date forward.

Refinance if rates drop. If current rates are significantly lower than what you’re paying, refinancing can lower your monthly payment or let you keep the same payment and pay off faster. Just make sure closing costs don’t eat up the savings.