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Extra Payment Savings Calculator
See how much interest you save and how many years you cut off your loan by paying a little extra toward principal each month. Enter your numbers and press Calculate.
Written by TopicDrill Editorial Team·Updated June 2026
Remaining balance over time
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How extra payments work
The calculator amortizes your loan twice. The first run uses only the scheduled payment. The second adds your extra amount to principal every month. The difference in total interest is your savings, and the difference in payoff dates is the time you cut off. The chart shows both balances, and the orange line, with the extra payment, reaches zero noticeably sooner.
Because interest is charged on the outstanding balance, attacking principal early has an outsized effect. The same extra dollar saves far more interest in year one than it would in the final year of the loan.
A quick example
On a $280,000 loan at 6.5% over 30 years, the payment is about $1,770 a month. Adding just $200 extra to principal each month can save tens of thousands in interest and pay the loan off years ahead of schedule. Larger extras compress the timeline even further.
Things to keep in mind
Make sure you have an emergency fund and no higher rate debt before committing extra cash to a low rate loan. Confirm there is no prepayment penalty in your loan terms. For guidance on paying down debt, the Consumer Financial Protection Bureau is a reliable source. You can also compare full payments with our mortgage calculator.
Frequently asked questions
How does paying extra each month save money?
Every extra dollar goes straight to the loan principal, not interest. A smaller principal means the lender charges interest on less money in every future month, so the savings compound. This both lowers total interest and shortens the loan.
Is it better to pay extra monthly or one lump sum?
Both help. Consistent monthly extras start reducing principal right away, which usually saves the most over a long loan. A single lump sum early in the loan is also powerful because it removes principal before years of interest can accrue on it.
Should I tell my lender the extra goes to principal?
Yes. Many servicers apply unmarked extra money to the next month's payment instead of the principal balance. Note that the extra amount is for principal only, and check your statement to confirm it was applied correctly.
Should I pay off the loan early or invest instead?
It depends on your interest rate and goals. If the loan rate is higher than what you could reliably earn investing, paying it down is a guaranteed return. If the rate is low, investing the extra may build more wealth, though it carries market risk.
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