Assuming all extra payments reduce principal
Some servicers require explicit instructions. Verify how extra funds are applied on each payment.
Extra Payment Payoff Calculator
Discover how additional monthly payments can reduce interest and pay off your loan faster.
Popular Extra Payment Scenarios
$200,000.00
5% · 15 years +$100/mo
$200,000.00
5% · 15 years +$200/mo
$200,000.00
5% · 30 years +$100/mo
$200,000.00
5% · 30 years +$200/mo
$200,000.00
6% · 15 years +$100/mo
$200,000.00
6% · 15 years +$200/mo
$200,000.00
6% · 30 years +$100/mo
$200,000.00
6% · 30 years +$200/mo
$200,000.00
7% · 15 years +$100/mo
$200,000.00
7% · 15 years +$200/mo
$200,000.00
7% · 30 years +$100/mo
$200,000.00
7% · 30 years +$200/mo
$250,000.00
5% · 15 years +$100/mo
$250,000.00
5% · 15 years +$200/mo
$250,000.00
5% · 30 years +$100/mo
$250,000.00
5% · 30 years +$200/mo
$250,000.00
6% · 15 years +$100/mo
$250,000.00
6% · 15 years +$200/mo
About Extra Payments
Making extra payments on your loan is one of the most effective ways to save money on interest and become debt-free faster. Every dollar of extra payment goes directly toward reducing your principal balance, which in turn reduces the interest charged on future payments — creating a compounding savings effect.
The impact of extra payments is most dramatic early in the loan term, when interest charges are highest. An extra $100 per month in the first year of a 30-year mortgage can save thousands in interest over the life of the loan. The earlier and more consistently you make extra payments, the greater the cumulative benefit.
Before committing to extra payments, check that your loan has no prepayment penalties. Most modern loans allow extra payments without fees. Also consider whether the money might earn a higher return elsewhere — if your loan rate is 4% but you could earn 7% investing, the math may favor investing. However, the guaranteed "return" of paying off debt makes extra payments attractive for risk-averse borrowers.
How Extra Payments Work
Extra Amount
The additional amount you pay each month beyond the required payment. Even small amounts ($50-$100) can save thousands in interest over time.
Timing
Extra payments made early in the loan have the greatest impact because they reduce the balance when interest charges are highest.
Interest Saved
Extra payments create a compounding savings effect — each dollar of principal reduction means less interest in every future month.
Time Saved
Regular extra payments can shorten a 30-year mortgage by 5-10 years depending on the amount, freeing you from debt significantly sooner.
Frequently Asked Questions
The savings depend on your loan amount, rate, term, and extra payment amount. As a rule of thumb, adding 10% to your monthly payment on a 30-year mortgage can reduce the term by 5-7 years and save 15-25% in total interest. Our calculator shows exact savings for your specific scenario.
Extra Payment Strategy Checklist
- Confirm your lender applies extra amounts to principal, not future scheduled payments.
- Check for prepayment penalties before committing to an acceleration plan.
- Compare extra-payment savings with other uses of cash (emergency fund, high-rate debt).
- Use consistent recurring extra payments to maximize compounding savings.
Common Mistakes To Avoid
Skipping emergency reserves
Sending too much cash to principal can reduce liquidity, forcing expensive borrowing later if expenses arise.
Questions To Ask Before You Borrow
- What fees are included in APR versus charged separately?
- Is there any prepayment penalty or restriction on extra principal payments?
- What assumptions could change the final payment before closing/funding?
Sources & Consumer Resources
LLM JSON API feed documentation
Machine-readable scenario feed and contract documentation.
CFPB: Consumer finance guidance
General borrower education and consumer protections.
Our methodology and editorial standards
Explains assumptions, scope, and review process for these calculators.
Editorial Review
Reviewed by: PayCalc Editorial Team
Last reviewed: 2026-02-20
Review cadence: Quarterly review or when assumptions change
About This Calculator
Our extra payment calculator shows exactly how additional monthly payments accelerate your loan payoff. Enter your loan details plus an extra payment amount to see the months saved, interest saved, and a side-by-side comparison of your original vs. accelerated schedule.
Results are for informational purposes only. Check your loan agreement for any prepayment penalties before starting an extra payment strategy.