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Mortgage Payoff Calculator 2026

See how much interest you save and how many years you cut off your loan by adding extra monthly or one-time principal payments — with a side-by-side payoff comparison.

Interest & Time Saved
Payoff Comparison Chart
Export to CSV
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How the Mortgage Payoff Calculator Works

This calculator takes your current loan balance, interest rate, and the years remaining, then runs two amortization schedules side by side. The first is your baseline — what happens if you keep making only the scheduled monthly payment until the loan ends. The second applies the extra principal you choose: a fixed amount added every month, plus an optional one-time lump sum applied today. It then loops month by month, charging interest on the falling balance and pushing every extra dollar straight to principal, until the balance reaches zero.

The two headline numbers — interest saved and time saved — come from comparing the two scenarios. Because early payments on any mortgage are dominated by interest, extra principal paid now removes a disproportionate amount of future interest, which is why even modest extra payments produce outsized savings. The chart visualizes how much faster your balance falls with extra payments, and the CSV export lets you keep the full comparison. Defaults reflect a typical 2026 scenario, so the page is useful the moment it loads.

Who Benefits Most From This Calculator

  • Homeowners with a higher-rate mortgage (say 6% or more) where prepaying is a strong guaranteed return.
  • People early in their loan, when extra principal eliminates the most future interest.
  • Anyone with a windfall — a bonus, tax refund, or inheritance — deciding whether a lump sum toward the mortgage is worthwhile.
  • Borrowers paying PMI who want to reach 20% equity and cancel it sooner.
  • Those nearing retirement who want to be mortgage-free and lower fixed expenses before their income drops.

Who Should Look Elsewhere

Prepaying isn't the right move for everyone. If you have a very low fixed rate (a 3% loan locked in years ago), the guaranteed return from prepaying is small and investing the difference will likely win over time. If you carry high-interest debt like credit cards, pay that off first — the math is overwhelmingly better. If you're not yet capturing your full employer 401(k) match or lack a 3–6 month emergency fund, prioritize those before locking cash into home equity, which is illiquid and slow to access. And if you have an adjustable-rate or interest-only loan, this fixed-rate model won't capture your changing payment. Want to model a brand-new loan's full payment with taxes and PMI instead? Start with the mortgage calculator.

Tax Implications of Paying Off Early

Paying down your mortgage faster means you pay less interest — and therefore have a smaller potential mortgage interest deduction. For most households this is a non-issue, because the 2026 standard deduction of $15,000 (single) or $30,000 (married filing jointly) already exceeds their itemizable deductions, so they claim no mortgage interest benefit at all. If you don't itemize, prepaying costs you nothing in lost deductions.

Even if you do itemize, the deduction only refunds a fraction of the interest at your marginal tax rate. The right way to compare prepaying versus investing is on an after-tax basis: a 6.5% mortgage that isn't deductible is a guaranteed 6.5% after-tax return when you prepay; if it is deductible at a 24% marginal rate, the effective cost of the loan is about 4.9% (6.5% × (1 − 0.24)), so you'd need to beat 4.9% after-tax in investments to come out ahead. Because investment gains are themselves taxable, the prepay option's guaranteed, tax-free nature is often more attractive than it first appears. Consult a tax professional for your specific situation.

Tips, Tricks & Things to Watch

  • Try biweekly payments — paying half your payment every two weeks results in 13 monthly payments a year instead of 12, painlessly adding one extra payment annually.
  • Recast vs refinance — after a lump sum, a recast lowers your required payment for a small fee without resetting the loan; refinance only when a lower rate justifies 2–5% closing costs.
  • Weigh invest vs payoff — compare your mortgage rate (after tax) against safe, after-tax investment returns and your risk tolerance before committing extra cash.
  • Ensure the extra goes to principal — designate every extra payment as "apply to principal" and confirm your next due date didn't move forward.
  • Check for a prepayment penalty — most modern loans have none, but verify in your promissory note and closing disclosure before sending a large payment.
  • Keep your emergency fund intact — home equity is illiquid; never drain savings to prepay if it leaves you exposed to a job loss or emergency.

Extra-Payment Payoff Formula (2026)

How an extra principal payment accelerates payoff and cuts total interest.

M = P × [ r(1+r)^n ] / [ (1+r)^n − 1 ]

Example:

$280,000 balance at 6.5% over 28 years

280000 × [0.005417(1.005417)^336] / [(1.005417)^336 − 1]
= $1,811.65 / month

Variables:

M - Scheduled monthly principal & interest
P - Current loan balance
r - Monthly interest rate (annual rate ÷ 12)
n - Remaining payments (years × 12)

Balanceₙ = Balanceₙ₋₁ − (M + Extra − Interestₙ)

Example:

Month 1 with $200 extra on a $280k balance

Interest = 280000 × 0.005417 = $1,516.67; principal = 1811.65 + 200 − 1516.67
= $494.98 to principal (vs $294.98 without extra)

Variables:

Interestₙ - Balanceₙ₋₁ × monthly rate r
Extra - Your additional monthly principal payment

Saved = (Base Interest − New Interest) and (Base Months − New Months)

Example:

$280k @ 6.5%, 28 yr, +$200/mo

$328,713 − $242,158 interest; 336 − 260 months
= ≈ $86,555 saved · 6 yr 4 mo sooner

Variables:

Base - Payoff with no extra payments
New - Payoff with your extra payments applied

These formulas provide the mathematical foundation for the calculations. Actual results may vary based on rounding, compounding frequency, and specific lender policies.

How We Calculate & Keep This Accurate

We compute your scheduled monthly principal & interest with the standard fixed-rate amortization formula on your current balance and remaining term. We then run two month-by-month schedules: a baseline with no extra payments, and one that applies your chosen extra monthly principal plus an optional one-time lump sum in the first month, looping until the balance reaches zero. Interest saved and time saved are the difference between the two.

We do not model adjustable rates, escrow (taxes and insurance), PMI removal timing, or prepayment penalties. Results are estimates for planning and may differ from your servicer's figures. Always confirm extra payments are applied to principal.

Data & Freshness

Figures reflect 2026 tax-year data.

Last updated June 9, 2026 · Maintained by the Financial Calculator editorial team.

Mortgage Payoff Calculator — Frequently Asked Questions

Answers to the most common questions about extra payments, biweekly schedules, recasting, PMI, deductions, and prepayment penalties.

How much do extra payments actually save me?

Every dollar of extra principal you pay eliminates all the future interest that dollar would have accrued, which is why extra payments are so powerful. On a $280,000 balance at 6.5% with 28 years left, adding just $200 a month to principal cuts roughly 6 years off the loan and saves on the order of $85,000 in interest. The earlier you make extra payments, the bigger the impact, because early in a mortgage the vast majority of each scheduled payment goes to interest rather than principal — so an extra dollar applied now wipes out far more interest than the same dollar applied near the end. The exact savings depend on your rate, balance, and remaining term: higher rates and larger balances produce dramatically larger savings. Use the calculator above to model your own numbers, including a one-time lump sum (such as a tax refund or bonus) applied today, which can shave additional months off the loan. The interest-saved and time-saved figures it returns are the two numbers that matter most when deciding whether to prepay.

Should I pay off my mortgage early or invest the money instead?

This is the central trade-off, and the honest answer is 'it depends on the after-tax math and your temperament.' Prepaying a mortgage gives you a guaranteed, risk-free return equal to your mortgage rate — paying down a 6.5% loan is like earning a guaranteed 6.5% (and even more if you don't itemize, because the interest you're avoiding wasn't deductible anyway). Investing might earn more over the long run — historically the stock market has averaged around 7–10% — but those returns are uncertain and taxable. A reasonable framework: if your mortgage rate is higher than what you could safely earn after tax, prepaying wins; if your rate is very low (say a 3% loan locked in years ago), investing the difference usually wins. Also prioritize maxing out employer 401(k) matches and high-interest debt before either. Finally, weigh the psychological value: many people sleep better debt-free even when the spreadsheet slightly favors investing. There's no single right answer, only the one that fits your rate, tax situation, risk tolerance, and goals.

What is a biweekly mortgage payment and does it help?

A biweekly payment plan means you pay half of your monthly mortgage payment every two weeks instead of one full payment each month. Because there are 52 weeks in a year, you make 26 half-payments — equivalent to 13 full monthly payments instead of 12. That one extra payment per year goes entirely to principal, painlessly accelerating your payoff and saving thousands in interest, typically cutting a 30-year loan by four to six years. The beauty of biweekly is that it aligns with biweekly paychecks and feels effortless. However, watch out for two things. First, some servicers charge an enrollment fee for formal biweekly programs or hold your half-payments until a full payment accumulates, which removes the benefit — in that case, just divide your payment by 12 and add that amount to principal each month yourself for free. Second, confirm the extra goes to principal, not toward the next scheduled payment. You can replicate the biweekly effect entirely on your own with no fees and full control over how the extra is applied.

Recast vs refinance vs extra payments — what's the difference?

All three can lower your interest cost, but they work differently. Extra payments simply add money to principal on your existing loan; your rate and required monthly payment stay the same, but you finish sooner and pay less interest — the most flexible option with no fees. A mortgage recast (or re-amortization) is when you make a large lump-sum principal payment and ask the servicer to recalculate your monthly payment over the remaining term; your rate and term stay the same, but your required monthly payment drops. Recasting usually costs only a small fee (often $150–$500) and is ideal if you've received a windfall and want lower monthly obligations without refinancing. A refinance replaces your loan entirely with a new one — useful when market rates have fallen enough to lower your rate, but it carries closing costs of 2–5% and resets the amortization clock. Rule of thumb: use extra payments for flexibility, recasting for a lower payment after a lump sum, and refinancing when a lower rate justifies the closing costs.

Does paying extra remove PMI faster?

Yes. If you're paying private mortgage insurance (PMI) because your down payment was under 20%, extra principal payments help you reach the equity threshold sooner, which lets you cancel PMI earlier and stop paying that monthly premium. Under the federal Homeowners Protection Act, your servicer must automatically cancel PMI once your balance reaches 78% of the home's original value, and you can request cancellation once you reach 80% loan-to-value (20% equity). Extra payments drive your balance down faster, so you hit that 80% mark months or even years ahead of schedule. To request early cancellation at 80%, contact your servicer in writing; they may require that you have a good payment history and sometimes a fresh appraisal to confirm the value hasn't dropped. Note that this calculator focuses on interest and time saved rather than PMI specifically, but the same accelerated principal paydown that saves interest also accelerates PMI removal. Removing PMI is effectively an extra, immediate return on top of the interest savings, since PMI provides you no benefit — it only protects the lender.

Will paying off my mortgage early cost me the interest deduction?

Paying down your mortgage faster means less interest paid, which means a smaller potential mortgage interest deduction — but for most households this matters far less than people fear. The mortgage interest deduction only helps if you itemize, and since the standard deduction is $15,000 for single filers and $30,000 for married couples filing jointly in 2025, the majority of homeowners take the standard deduction and get no tax benefit from mortgage interest at all. If you don't itemize, prepaying costs you nothing in lost deductions. Even if you do itemize, the deduction only refunds a fraction of the interest — at a 24% marginal rate, every $1 of interest 'saves' you 24 cents in tax, but you still spent the full dollar. In other words, you never come out ahead by paying interest purely to claim a deduction. The interest you avoid by prepaying is real, guaranteed savings; the deduction you forgo is at most a partial offset and often zero. Run your own numbers, but don't keep a mortgage solely for the tax break.

How do I make sure my extra payment goes to principal?

This is the single most important step, because many servicers will, by default, apply extra money toward your next scheduled payment (prepaying interest) rather than reducing your principal balance — which gives you none of the payoff acceleration. To avoid this, explicitly designate every extra payment as 'apply to principal.' If you pay online, look for a separate 'additional principal' field rather than just paying more in the regular payment box. If you mail a check, write 'apply to principal' in the memo line and ideally include a note. After each extra payment, check your next statement to confirm your principal balance dropped by the full extra amount and that your next due date didn't get pushed forward — if the due date moved, the servicer treated it as a prepayment of the next bill, not a principal reduction, and you should call to have it corrected. Setting up a recurring automatic 'additional principal' payment is the cleanest approach. Keeping records of each extra payment also protects you if there's ever a dispute about how funds were applied.

Is there a prepayment penalty on my mortgage?

Most modern conventional mortgages in the United States have no prepayment penalty, so you can pay extra or pay the loan off entirely without any fee. Federal rules tightened sharply after the 2008 financial crisis: under the Dodd-Frank Act and CFPB qualified-mortgage rules, prepayment penalties are banned outright on most home loans and tightly restricted on the few where they're still allowed (they can only apply in the first three years and must be capped). Government-backed FHA, VA, and USDA loans cannot charge prepayment penalties at all. That said, you should always confirm by checking your loan documents — specifically the promissory note and the closing disclosure, which must state whether a prepayment penalty exists. Penalties, where they survive, are more common on older loans, certain non-qualified or investor loans, and some commercial mortgages. If you do find a penalty clause, calculate whether the interest you'd save by prepaying still exceeds the penalty cost; often it does, but you want to know before you send a large extra payment. When in doubt, call your servicer and ask directly.
US Mortgage Payoff Calculator User Reviews

Disclaimer: Results are estimates for planning only and do not constitute tax, legal, lending, or investment advice. Actual paycheck and tax outcomes can vary based on employer settings, local rules, and personal elections. Consult a qualified US tax professional, CFP, or attorney before making financial decisions.