Mortgage Payoff Calculator

Should you pay off your mortgage early?

Paying off a mortgage early is one of the few moves in personal finance with a guaranteed, risk-free return: every extra dollar of principal saves you your mortgage's interest rate, with no market risk and no taxes on the "gain." On a 6.5% loan, prepaying is the equivalent of earning a guaranteed 6.5% — which is why so many households prioritize it.

The trade-off is liquidity and opportunity cost. Money sent to the mortgage is hard to get back without a refinance or HELOC, and over long horizons a diversified stock portfolio has historically returned more than typical mortgage rates. The right answer depends on your rate, your other debts, your emergency fund, and how much you value being debt-free. The calculator above shows the concrete dollars and years so you can decide with real numbers, not rules of thumb.

How this mortgage payoff calculator works

• Your payment. The fixed monthly principal-and-interest payment is derived from your current balance, rate, and remaining term using the standard formula M = P · r / (1 − (1 + r)^−n).
• Standard schedule. The calculator first simulates paying exactly that amount until the balance hits zero — your baseline payoff date and total interest.
• Your plan. It then re-simulates with your extras: a one-time lump sum reduces the balance immediately, any extra monthly amount is added to each payment, and biweekly mode pays half the amount every two weeks (26 half-payments a year).
• Savings. The difference between the two simulations is your interest saved and time saved. Because every extra dollar lowers the balance that future interest is charged on, the savings compound.

This matches a spreadsheet built with Excel's PMT() function plus an extra-principal column. Nothing is sent to a server; the "copy link" button just encodes your inputs into the web address. For the full payment-by-payment breakdown, open the amortization schedule calculator.

Ways to pay off a mortgage faster

• Extra monthly principal. The simplest method — add a fixed amount to every payment. Even $100–$200 a month typically removes several years and tens of thousands in interest from a 30-year loan.
• Biweekly payments. Pay half your monthly amount every two weeks. The 26 half-payments equal 13 full payments a year, so one extra payment goes to principal annually — usually trimming four to six years off a 30-year mortgage with no big budget change.
• Lump sums. Apply a tax refund, bonus, or windfall directly to principal. Because of front-loaded interest, a lump sum early in the loan saves far more than the same amount later.
• Round-up payments. Rounding a $1,896 payment up to $2,000 is a painless, automatic version of extra-principal — worth more than it looks over decades.
• Refinancing to a shorter term. Moving from a 30-year to a 15-year loan forces faster payoff at a usually lower rate, though the monthly payment rises. Compare carefully before paying closing costs.

Whichever you choose, confirm with your servicer that extra money is applied to principal, not stored as a prepayment of next month's bill — otherwise it won't shorten the loan.

Pay off the mortgage vs invest the difference

This is the classic debate. Prepaying guarantees a return equal to your rate; investing the same money in a diversified portfolio has historically averaged more but with real risk and no guarantee. A useful way to decide is to model both: see your interest saved here, then run the same monthly amount through the compound interest calculator at a conservative return to compare the likely outcomes side by side.

Beyond the math, there's the behavioral and emotional side. A paid-off home lowers your required monthly expenses, which makes early retirement and job flexibility easier — feed your post-payoff budget into the retirement calculator to see how a smaller required income changes your target nest egg. None of this is financial advice; it's a framework to make the numbers visible so you can choose what fits your life.

Paying down to drop PMI early

If you put less than 20% down, you are likely paying private mortgage insurance (PMI) — a monthly fee that protects the lender, not you. Once your loan balance falls to 80% of the home's original value, you can usually request PMI cancellation, and it must automatically terminate at 78%. Targeting that threshold with extra payments is a high-value, often-overlooked use of prepayment: you remove a recurring cost on top of saving interest. Use the calculator to see how quickly extra payments bring your balance to that 80% mark.

Frequently asked questions about early mortgage payoff