Mortgage Payoff Calculator

Why do early extra mortgage payments save so much?

A standard 30-year mortgage at 6.5% spends the first several years paying mostly interest. On a $300,000 loan the first payment is $1,896.20 — $1,625.00 of it is interest and only $271.20 reduces the balance, so the balance falls by less than $3,300 in the whole first year.

An extra $200 paid in that first month is never charged interest again: over the life of the loan it cancels $1,198 of interest, about six dollars for every dollar prepaid.

As the balance falls, each extra dollar earns less leverage. This is why financial educators say "pay extra early" — not just because of time value, but because the interest-to-principal ratio is steepest at the start. The calculator shows this by plotting both balance curves; notice how the accelerated curve separates quickly in the first decade and then the gap narrows proportionally.

Do biweekly mortgage payments really work?

Paying half your monthly payment every two weeks produces 26 half-payments per year — equivalent to 13 full monthly payments instead of 12. That one extra payment per year takes about four years off a 30-year mortgage at 6.5% — 47 months on a $300,000 loan, saving $90,419 in interest — with no increase in your monthly outlay.

The important caveat — one most biweekly calculators omit — is that many mortgage servicers do not apply a mid-month half-payment immediately. Instead they hold it in a suspense account until the second half arrives, then credit both as one full payment on the due date. In that case you get no interest-accrual benefit from the early half at all. Before setting up biweekly payments, ask your servicer in writing whether they credit each half-payment on receipt. If they do not, simply make one extra full payment each December to get the same mathematical result, guaranteed.

This calculator assumes the ideal case (each half applied on receipt) so the savings figure is the maximum possible. Your actual savings may be lower if your servicer uses a suspense account.

Should you recast or prepay after a lump sum?

When you receive a windfall — an inheritance, a bonus, a property sale — you have two options for applying it to your mortgage. Prepaying keeps your payment the same and shortens the term: every month you keep paying the same amount, but a larger share hits principal and the loan ends earlier.

Recasting (re-amortizing) applies the lump sum to the balance and then recalculates your payment at the new, lower balance for the original remaining term: your payment falls, but the payoff date does not move.

Recast wins if your goal is cash-flow relief — a lower monthly obligation. Prepay wins if your goal is interest savings and an earlier payoff date. The key asymmetry: recasting is usually a lender service with a small fee ($150-$500) and is not available on FHA or VA loans; prepaying is free and available on any conventional loan without a prepayment penalty. This calculator shows both paths side by side so you can see the exact dollar difference under your own balance and rate.

One important note: a recast does not shorten your term. If you want both a lower payment and an earlier payoff, consider making extra principal payments on top of the recasted payment.

How much sooner does PMI drop with extra payments?

Private mortgage insurance (PMI) is required on conventional loans when the down payment is less than 20% of the purchase price. Under the Homeowners Protection Act (12 U.S.C. §4901-§4910) you have the right to request cancellation when your balance reaches 80% of the original purchase price, and automatic cancellation when it reaches 78%.

Extra principal payments accelerate the date your balance crosses those thresholds. For a $350,000 home with 10% down (a $315,000 loan at 6.5% over 30 years) and PMI of $175/month, the balance reaches the 78% automatic-cancellation point ($273,000) at payment 109, about nine years in. An extra $200/month brings that to payment 72 — 37 months sooner, saving $6,475 in PMI premiums on top of the interest saved. (The 80% request point, $280,000, moves from payment 95 to payment 62.) Enter the original price and your monthly PMI in the Advanced section to see your own dates.

FHA annual mortgage insurance premium (MIP) behaves differently: for loans originating after June 2013 with less than 10% down, MIP runs for the life of the loan regardless of LTV. If your loan is FHA, the PMI panel will not apply; consider refinancing to conventional once you reach 20% equity.

What should you check with your servicer before paying extra?

This calculator makes several simplifying assumptions that you should check against your actual loan. First, it assumes a fixed interest rate for the entire remaining term; adjustable-rate mortgage (ARM) payments will change at each adjustment and this tool does not model future rate adjustments.

Second, it assumes extra payments are applied to principal immediately, with no prepayment penalty; if your loan agreement has a penalty clause (uncommon after 2014 but not extinct), the savings figure overstates the net benefit.

Third, the balance you enter should be the principal balance from your most recent statement — not the payoff amount (which includes accrued interest to the payoff date) and not the original loan amount. Fourth, if your payment includes escrow for taxes and insurance, enter only the P&I portion as the base payment; the calculator models principal acceleration, not total payment changes.

As required by the CFPB, this calculator provides estimates for planning. Your actual payoff date and interest savings depend on the timing and application of payments as your servicer processes them, potential late fees, and any gap between statement balance and true per-diem balance. The estimate note beside every result reminds you of this.