Mortgage Payoff Calculator
Find a new payoff date and interest saved from an extra monthly payment, switching to biweekly payments, or a one-time lump sum toward your mortgage.
Written by Rahman · Last reviewed
Quick answer
On a $280,000 balance at 6.5% with 27 years left, switching to biweekly payments alone clears the loan about 4 years 10 months early and saves roughly $65,977 in interest. Three strategies get there differently: an extra amount every month reduces principal continuously, a one-time lump sum reduces it immediately and once, and biweekly payments (half the monthly amount every two weeks) sneak in one extra monthly-equivalent payment a year, because 26 half-payments is 13 monthly payments rather than 12.
Paying half the monthly payment every two weeks is 26 payments a year — 13 monthly-equivalents instead of 12.
Results are estimates for general guidance and are not financial, tax or legal advice. Except where a calculator names a currency, figures carry no currency of their own: put in pounds and you get pounds back, put in rupees and you get rupees. Figures depend on the assumptions you enter and on rates that change over time. Check current rates and speak to a qualified adviser before acting on them.
About the Mortgage Payoff Calculator
Paying off a mortgage faster than scheduled always works the same way underneath: extra money goes straight to principal, which reduces every future month's interest charge. The three common strategies differ only in how and when that extra money arrives.
This calculator models all three against your current balance and remaining term, so you can compare a small painless change (biweekly payments) against a deliberate one (a fixed extra amount, or a lump sum) using your own numbers.
Why biweekly payments work without feeling like a sacrifice
Paying half your monthly mortgage payment every two weeks sounds identical to paying the full amount monthly, but it is not: a year has 52 weeks, so biweekly payments land 26 times a year, or 13 full-payment-equivalents, not 12. The extra payment arrives one calendar quarter at a time without ever asking for a specific "extra" amount.
This works especially well for anyone paid biweekly themselves, since the payment cadence matches income cadence. It is a mechanical trick, not a subsidy: the total extra committed per year is exactly one monthly payment, the same as choosing to pay 1/12th extra each month, just delivered differently.
Comparing the same dollars, delivered differently
Because biweekly delivers a fixed extra of "one monthly payment a year" regardless of the payment size, a deliberately chosen extra-monthly amount can be tuned to save more or less. On the $280,000 example above, a chosen $200 a month extra ($2,400 a year) outpaces biweekly's roughly $1,836-a-year equivalent, paying off about a year sooner and saving over $79,000 rather than $65,977, because it is simply a larger extra commitment, not a better mechanism.
- Biweekly suits someone who wants the effect without deciding on a specific extra amount.
- A chosen extra-monthly amount lets you dial the tradeoff between monthly cash flow and total savings directly.
- A lump sum is the right tool for a windfall (a bonus, inheritance or tax refund), since it reduces the balance once rather than committing to an ongoing payment change.
Frequently Asked Questions
Does my lender have to accept biweekly payments?
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Not automatically. Some servicers offer a formal biweekly program (sometimes for a fee); others simply accept whatever payments you send as long as the loan stays current. Confirm how your specific servicer applies extra payments before relying on the schedule this calculator shows.
Is there a prepayment penalty?
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Most modern mortgages do not carry one, but some loans (particularly older or non-conforming ones) do. Check your loan documents before committing to any of these strategies.
Should extra payments go to my mortgage or into investments instead?
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It depends on your mortgage rate versus your realistic investment return, your risk tolerance, and how much you value the certainty of a paid-off home. There is no universally correct answer.
Does making extra payments reduce my required monthly payment?
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Usually not automatically. Most servicers keep the required payment the same and simply pay off the loan sooner. Confirm with your servicer whether extra payments shorten the term or lower future payments.
Sources
- 12 CFR § 1026.43(g) — Prepayment penalties (eCFR) — Backs the prepayment-penalty answer in the FAQ. Regulation Z bars a prepayment penalty on a covered mortgage unless the rate cannot increase after consummation, the loan is a qualified mortgage, and it is not a higher-priced mortgage loan, and even where one is permitted it must not apply beyond three years from consummation and is capped as a percentage of the balance prepaid. So on most current US mortgages the strategies modelled here cost nothing extra, but the loan document is still where to confirm it.