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Mortgage Payoff Calculator
Find out how much interest you save — and how many years you shave off — by making extra principal payments each month. Free, instant, no account required.
Any amount above your required monthly payment
Monthly Payment
$1,896
Principal + interest only
Time Saved
6 yr 11 mo
Interest Saved
$103,449
How Extra Mortgage Payments Work
Every mortgage payment is split between interest and principal. Early in your loan, most of your payment goes to interest — which is why the first few years feel like you are barely denting the balance.
Extra principal payments short-circuit this cycle. When you pay down principal faster, the interest calculation in every subsequent month is based on a lower balance. That compounding effect is why even a small extra amount like $100/month makes such a dramatic difference over the life of a 30-year loan.
Example: $300K Mortgage at 6.5%
Strategies to Pay Off Your Mortgage Early
Bi-weekly payments
Pay half your monthly amount every two weeks. You end up making 13 full payments per year instead of 12, cutting years off a 30-year loan with no budget change.
Lump sum payments
Apply tax refunds, bonuses, or any windfall directly to principal. Even one $2,000 extra payment early in the loan can eliminate months of future payments.
Round up your payment
If your payment is $1,847, pay $2,000. The extra $153/month is painless and eliminates years of payments. Ask your servicer to apply the overage to principal.
Refinance to 15 years
Rates on 15-year mortgages are typically 0.5–1% lower. You will pay more monthly but half the total interest vs. a 30-year. Best when you can handle the higher payment.
Want to track all your debts — including your mortgage — in one place? DebtClear lets you see your payoff timeline, set reminders, and celebrate each milestone.
Frequently Asked Questions
How much do I save by paying extra on my mortgage?
Even $100–$200 extra per month on a 30-year mortgage can save tens of thousands in interest and shave 4–7 years off your loan. On a $300,000 mortgage at 6.5%, paying an extra $200/month saves roughly $57,000 in interest and pays off 6 years early. Use the calculator above for your exact numbers.
Does paying extra on a mortgage go to principal?
Yes — as long as you specify it is an extra principal payment and your loan has no prepayment penalty. Extra payments reduce your principal balance directly, which lowers the interest charged in every future month. This is why early extra payments have the largest impact.
Is it better to pay off a mortgage early or invest?
It depends on your mortgage rate vs. expected investment returns. If your mortgage rate is 7%+ and you are risk-averse, paying it down is often the better guaranteed return. If your rate is below 5%, investing in a diversified index fund has historically outperformed. Many people do both — extra payments for peace of mind plus consistent investing.
What is the fastest way to pay off a mortgage?
The fastest methods are: (1) Bi-weekly payments — making half your payment every two weeks results in one extra full payment per year. (2) Lump sum payments — applying bonuses, tax refunds, or windfalls directly to principal. (3) Refinancing to a shorter term (15 vs 30 year). (4) Simply increasing your monthly payment consistently. Any combination of these dramatically accelerates payoff.
What happens if I pay an extra $500 a month on my mortgage?
On a $300,000, 30-year mortgage at 6.5%, paying an extra $500/month reduces your payoff time by about 11 years and saves over $116,000 in interest. The exact savings depend on your loan balance, rate, and remaining term — the calculator above shows your personalized numbers instantly.
Track Your Payoff in the Free App
Use the DebtClear app to log payments, track your real balance, and get monthly reminders. Track your mortgage alongside other debts as extra principal payments add up.