Paying a little extra each month can cut years from a loan. That works because interest is charged on the balance you still owe, so every dollar of extra principal stops generating interest from that day on. This guide shows how a regular loan payment is split, how much different extra amounts save on a mortgage and a car loan, and what to check before you start. You can test your own numbers in our payment calculator.
On a $250,000 loan at 6.5% over 30 years, adding $200 a month pays the loan off in about 22 years instead of 30 and saves roughly $97,600 in interest. The standard payment is $1,580.17 a month.
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How each payment is split
On a fixed-rate loan the monthly payment stays the same, but the split between interest and principal changes. Early on most of it is interest. For a $250,000 loan at 6.5% over 30 years, the payment is $1,580.17:
Principal = $1,580.17 − $1,354.17 = $226.00
Only about 14% of the first payment reduces the balance. As the balance falls, the interest part shrinks and more of each payment goes to principal. An extra payment skips ahead in that schedule, because it removes principal that would otherwise have been paid, with interest, years later.
Example: extra payments on a mortgage
Same loan: $250,000, 6.5%, 30 years, payment $1,580.17. Here is what a fixed extra amount each month does (extra applied to principal):
| Extra per month | Time to pay off | Total interest | Interest saved |
|---|---|---|---|
| $0 | 30 years | $318,861 | none |
| $100 | 25 years 4 months | $260,001 | $58,860 |
| $200 | 22 years 1 month | $221,243 | $97,618 |
| $500 | 16 years 3 months | $155,345 | $163,516 |
Even $100 a month, which is about 6% more than the regular payment, takes more than four and a half years off the loan. The savings are large because each extra dollar removes interest that would have been charged for years.
Example: a car loan
Shorter loans benefit too, though the dollar savings are smaller. For a $20,000 loan at 8% over 5 years, the payment is $405.53 and total interest is $4,332.
| Extra per month | Time to pay off | Total interest |
|---|---|---|
| $0 | 5 years (60 payments) | $4,332 |
| $100 | 3 years 11 months (47 payments) | $3,295 |
An extra $100 a month saves about $1,036 in interest and finishes the loan 13 months early.
Ways to pay a loan faster
- Add a fixed amount each month. The simplest method, and easy to fit in a budget. Even a small number helps.
- Make one extra payment a year. Putting a tax refund or bonus toward principal has a similar effect. One extra payment a year is about the same as adding $132 a month to this mortgage ($1,580.17 ÷ 12).
- Pay every two weeks. Half the payment every two weeks adds up to 26 half payments, which equals 13 full payments a year. It works like the extra payment above, but only if your lender applies each half payment right away and does not hold it until the full amount arrives.
- Round up your payment. Paying $1,600 instead of $1,580.17 is easy to automate.
- Make lump-sum payments. A one-time payment early in the loan saves more than the same amount paid late.
- Refinance to a shorter term or lower rate. This can cut interest, but refinancing has fees, so compare the total cost first.
Check these before you start
- Make sure the extra goes to principal. Some lenders apply an extra amount to the next payment unless you mark it as "principal only".
- Look for a prepayment penalty. Some loans charge a fee for paying early. Your loan paperwork will say.
- Keep an emergency fund. Money paid into a loan is hard to get back quickly.
- Pay higher-rate debt first. Extra payments save more on a 22% credit card than on a 5% mortgage.
Extra payments or something else?
Paying down a loan gives a certain result: you save the interest at the loan's rate. Investing the same money might earn more or less, and the outcome is uncertain. A rough rule: when the loan rate is high, paying it down is usually attractive; when it is low, other goals may come first. The right answer depends on your rate, your savings and your comfort with risk. You can see how invested money grows in our compound interest guide, since paying off a loan is the same effect working in your favor.
How to use the calculator
Enter the loan details
Type the loan amount, interest rate and term in years.
Add an extra payment
Enter the extra monthly amount you are thinking about.
Compare results
Check the payoff time and total interest, then change the extra amount and compare.
See what an extra payment saves you
Enter your loan and try different extra amounts.
Open the Payment CalculatorFrequently Asked Questions
Conclusion
Extra payments work because they cut the balance that interest is charged on. On a $250,000 mortgage, $100 a month saves nearly $59,000 in interest and $200 saves about $98,000. Try your own loan in the payment calculator, or see the full monthly cost of a home in the mortgage calculator.
This guide is general education, not financial advice. Examples assume a fixed-rate loan, monthly payments, and extra amounts applied to principal. Check your loan terms for fees and prepayment rules.