Mortgage Payoff Calculator With Extra Payments and Amortization Schedule

An extra $200 a month on a $300,000, 30-year mortgage at 6.5% pays it off 6 years and 11 months early and saves $103,450 of interest. The calculator below runs the same math on your own loan: a monthly extra, a yearly extra, a one-time lump sum or biweekly payments. Switch it to the second mode to see the extra payment it takes to be done by a date you pick. It also shows when you can ask to drop PMI, and prints a full amortization schedule.

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Mortgage Payoff Calculator

Enter the balance and time left from your latest mortgage statement, not the amount you first borrowed. Leave taxes and insurance out: extra payments only change principal and interest.

The Short Answer

Every extra dollar of principal is a guaranteed return at your mortgage rate. It is interest you never pay.
Small amounts go a long way early in the loan. On a new $300,000 loan at 6.5%, $100 a month extra cuts 4 years and saves about $61,000.
Biweekly payments work because they add a 13th payment each year, not because of the timing. You can get the same result by adding 1/12 of a payment each month.
A lump sum shortens the loan; a recast lowers the payment instead. Recasting is up to your lender.
Check for a prepayment penalty first. Federal rules allow one only on certain fixed-rate loans and only in the first 3 years. Your Loan Estimate and Closing Disclosure state whether your loan has one.

What Each Extra Payment Saves

A $300,000 loan at 6.5% for 30 years has a principal and interest payment of $1,896.20. Paid on schedule, it costs $382,637 in interest. Here is what common extra payments do from the first month:

Extra payment	Paid off in	Time saved	Interest saved
None	30 years	none	$0
$50 a month	27 years 10 months	2 years 2 months	$33,583
$100 a month	26 years	4 years	$60,996
$200 a month	23 years 1 month	6 years 11 months	$103,450
$500 a month	17 years 6 months	12 years 6 months	$179,762
$1,000 a month	12 years 9 months	17 years 3 months	$241,165
Biweekly (13 payments a year)	24 years 2 months	5 years 10 months	$87,259
$2,000 once a year	24 years 1 month	5 years 11 months	$87,373
$10,000 once, at the start	27 years 3 months	2 years 9 months	$53,603

Hypothetical example: interest figured monthly and rounded to the cent, extra payments applied to principal. If you are years into your loan, the savings are smaller because less interest is left to save. Enter your current balance and remaining term above to see your own numbers.

Why Extra Principal Saves So Much

Each month your lender charges interest on the balance you still owe: the annual rate divided by 12. On $300,000 at 6.5%, the first month's interest is $1,625, so only $271.20 of the $1,896.20 payment reduces the balance. That split is why the early years of a mortgage feel like they go nowhere.

An extra $200 of principal does two things. It lowers the balance right away, and from then on every payment carries a little less interest and a little more principal. The effect compounds in your favor, the same way interest compounds against you. Open the amortization schedule in the calculator and compare the two balance columns to watch the gap grow.

The flip side: once you are deep into a loan, most of each payment is already principal, so the same extra dollar saves less. If you have 8 years left, extra payments still save interest, but far less than in year one.

Paying It Off by a Date

Many people work backward from a goal: mortgage-free by retirement, or before a child starts college. Pick "What it takes to pay it off by a date" in the calculator. For the $300,000 example:

Done in 20 years: $340.52 a month extra. Total interest $236,812, about $145,800 less.
Done in 15 years: $717.13 a month extra. Total interest $170,397, about $212,200 less.

Paying extra on a 30-year loan keeps the lower required payment as a safety net: in a tight month you can skip the extra. A 15-year mortgage usually has a lower rate, so it saves more, but the higher payment is required every month.

Biweekly Payments

On a biweekly plan you pay half your monthly payment every two weeks. A year has 52 weeks, so you make 26 half-payments, which equals 13 full payments instead of 12. That 13th payment is where the savings come from: about 5 years and 10 months and $87,000 on the example loan.

Paying sooner does not add much on its own. Under the federal servicing rules, a payment smaller than a full monthly payment can be held in a suspense account until enough arrives to make a full payment (Regulation Z, 12 CFR 1026.36(c)). So a half-payment may simply wait two weeks.

You can get the same result without signing up for anything. Add 1/12 of your payment to each monthly payment ($158.02 on the example loan), or make one extra payment a year. If a company offers to set up biweekly payments for a fee, compare the fee with doing it yourself.

Lump Sums and Recasting

A bonus, tax refund or inheritance can go straight to principal. By default the required payment stays the same and the loan ends sooner: $10,000 at the start of the example loan cuts 2 years and 9 months and saves $53,603.

A recast (also called re-amortization) works the other way. After a large principal payment, the lender recalculates your payment over the time left, so the payment drops and the end date stays put. After a $50,000 payment at the start of the example loan, a recast would lower the payment from $1,896.20 to about $1,580.17. Lenders are not required to offer recasts and terms vary, so ask your servicer about any minimum payment and fee. The calculator shows the recast payment whenever you enter a lump sum.

Which is better? A shorter loan saves more interest. A recast frees up monthly cash flow, which can matter if your income is about to drop.

Extra Payments Can End PMI Sooner

If you put down less than 20% on a conventional loan, you probably pay private mortgage insurance (PMI). The Homeowners Protection Act gives you two exits on a fixed-rate loan for your main home:

Cancel at 80%. You can ask in writing to cancel PMI once the balance reaches 80% of the home's original value, either on the original schedule or "based solely on actual payments" (12 U.S.C. 4901(2)). Extra payments get you there sooner. You need a good payment history, must be current, and the lender can ask you to show the home has not lost value and has no second lien.
Automatic at 78%. PMI ends on its own when the balance is scheduled to reach 78% of the original value on the original amortization schedule, if you are current. Extra payments do not move this date.

"Original value" is the lower of the purchase price and the appraisal at closing. Example: on a $330,000 home with a $300,000 loan at 6.5%, the balance reaches $264,000 (80%) at payment 101 on schedule, but at payment 65 with $200 a month extra, about three years sooner. Enter your original home value and PMI premium in the calculator to see your dates.

These rules cover loans closed on or after July 29, 1999. They do not apply to FHA, VA or USDA mortgage insurance, and some higher-risk loans have different terms (12 U.S.C. 4902(g)).

Check These Before You Pay Extra

Prepayment penalty. Federal rules define it as a charge for paying "all or part" of the principal early (12 CFR 1026.32(b)(6)). Under the ability-to-repay rule, a mortgage can have one only if it is a fixed-rate or step-rate qualified mortgage that is not higher-priced. It can apply only in the first 3 years: at most 2% of the amount prepaid in years one and two, and 1% in year three (12 CFR 1026.43(g)). Your Loan Estimate and Closing Disclosure answer "Prepayment Penalty" yes or no in the Loan Terms table.
Mark it as principal. Use your servicer's "additional principal" option or note it on the payment. Then check the next statement to see that the balance dropped by the extra amount.
Emergency fund first. Money paid into the house is hard to get back without a loan or a sale. Keep an emergency fund before sending extra.
Higher-rate debt first. A credit card at 20% costs far more than a 6.5% mortgage. Pay off credit card debt before extra mortgage payments.
Do not skip a 401(k) match. An employer match is an instant return no mortgage rate can beat.

Should You Pay Off the Mortgage Early?

The extra payment earns exactly your mortgage rate, with no risk. Investing the same money could earn more over long periods, or less, and the result is not guaranteed. A 3% mortgage and a 7% mortgage are very different decisions. Our pay off the mortgage or invest calculator compares the two paths side by side.

Taxes change the math less than many people think. You can deduct mortgage interest only if you itemize, and the 2026 standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly. If your mortgage interest and other itemized deductions come in below that, the deduction saves you nothing. For those who do itemize, interest is deductible on up to $750,000 of home acquisition debt ($375,000 if married filing separately), or $1 million for debt taken on before December 16, 2017 (IRS Publication 936).

The case for paying off early is also about cash flow. A paid-off house lowers the income you need in retirement. Our retirement calculator shows how much that helps.

Sources & Methodology

12 CFR 1026.43(g): when a prepayment penalty is allowed and its limits. Definition in 1026.32(b)(6); disclosure in 1026.37(b)(4).
12 CFR 1026.36(c): crediting payments and holding partial payments.
12 U.S.C. 4901 and 4902: Homeowners Protection Act PMI cancellation and termination.
IRS Publication 936: home mortgage interest deduction limits.

Method notes. The calculator builds a fixed-rate amortization schedule month by month. Interest each month is the balance times the annual rate divided by 12, rounded to the cent. Extra money goes to principal after the regular payment. Biweekly is modelled as 13 payments a year, spread as 1/12 of a payment extra each month. The yearly extra is paid with every 12th payment. The PMI dates compare your balance with 80% of the original value, using the schedule from your current balance; the official 80% schedule date runs from the loan's original terms, so ask your servicer for it. Adjustable-rate loans, escrow, and daily-interest loans are not modelled. Dates count from your next payment.

This article is educational and is not financial advice. Examples are hypothetical. Rules were checked against federal regulations and IRS publications on 2026-10-13.

FAQ

How much faster will I pay off my mortgage with $100 extra a month?
On a new $300,000 loan at 6.5% for 30 years, $100 a month extra pays it off 4 years early and saves about $61,000 of interest. Enter your own balance, rate and remaining term in the calculator for your loan.

Is it better to pay extra monthly or one lump sum a year?
Paying the same total monthly saves slightly more, because each extra dollar starts cutting interest sooner. On the example loan, $2,000 once a year saves $87,373, while $166.67 a month (the same $2,000 a year) saves $90,767 and finishes 2 months earlier. The difference is small; pick what fits your budget.

Do extra payments lower my monthly payment?
No. On a standard fixed-rate loan the required payment stays the same and the loan ends sooner. To lower the payment you would need a recast or a refinance.

Can my lender charge me for paying extra?
Only if your loan has a prepayment penalty. Federal rules allow one only on certain fixed-rate qualified mortgages, for the first 3 years, capped at 2% of the amount prepaid in years one and two and 1% in year three. Your Closing Disclosure says whether your loan has one.

What is an amortization schedule?
A table of every payment over the life of the loan, showing how much goes to interest, how much to principal, and the balance left after each one. The calculator above shows it by year or by month.

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"Mortgage Payoff Calculator: How Much Faster Do Extra Payments Pay Off Your Loan?" Wealthy Pot, 2026. https://wealthypot.com/mortgage-payoff-calculator/