How to Pay Off Your Mortgage Early

Every number on this page comes from the same mortgage, so you can compare the strategies directly:

That last row is the number worth sitting with. Over 30 years you would pay $886,633 for a $400,000 loan — the interest alone is 121.7% of what you borrowed. Everything below is a way to attack that figure.

The simplest method, and the one with the most predictable result. You keep making your normal payment and add a set amount on top, designated as principal.

Notice the returns are not linear. Doubling the extra payment from $200 to $500 (2.5×) only raises the interest saved from $104,950 to $193,929 (1.8×). That is because the early dollars do the heaviest lifting — they remove interest from the longest stretch of remaining months.

Popular because it maps onto a bonus or a tax refund. There are two ways to do it, and they are not quite equivalent:

Spreading it across the year wins by $3,996 and two months — the money reaches your principal sooner, so it starts suppressing interest sooner. If your cash flow allows the monthly version, take it.

You pay half your monthly payment every two weeks. Because there are 26 two-week periods in a year, you make 26 half-payments — the equivalent of 13 full monthly payments instead of 12.

Mathematically this is method #2 in disguise: 5 years 7 months and $107,025 on our loan. The advantage is behavioural — it syncs with a biweekly paycheck and needs no ongoing decision.

A bonus, an inheritance, a tax refund, the proceeds of a sale. A one-time payment early in the loan is startlingly efficient:

A single $10,000 payment in year one removes $50,967 of future interest. That is a 5.1× return, locked in, with no market risk — because you are not earning 6.25%, you are not paying 6.25%, every month, for 29 more years.

The per-dollar return falls as the lump gets bigger, and it falls the later you pay. The same $10,000 applied in year 20 saves a fraction of what it saves in year one.

The least painful option. Round your payment up to a round number and let the difference hit principal:

Thirty-seven dollars a month — less than a streaming bundle — is worth $24,350 and fifteen months on this loan.

Instead of adding extra to a 30-year loan, you replace it with a 15- or 20-year loan. Shorter terms usually carry lower rates, and the forced schedule removes the discipline problem.

The 15-year refinance is the single biggest lever here — but it is also the only one that is mandatory once you sign. An extra $200 a month is something you can stop in a hard month; an $805 higher required payment is not. Closing costs also need to be earned back before the saving is real.

A recast means paying a large lump sum and asking your servicer to re-amortize the loan over the remaining term. Your payment drops. Here is what that actually does on our loan, assuming a $50,000 lump in year 5:

Recasting costs you $94,040 more interest and 79 extra payments than making the same lump sum and keeping your payment where it was. Recasting is a cash-flow tool, not a payoff tool. It is the right choice if you need the monthly relief — and the wrong one if your goal is to be debt-free sooner.

All seven strategies do the same one thing: they reduce your balance faster than the schedule requires.

Your interest each month is simply your rate divided by 12, multiplied by your current balance. On payment one of our loan:

Only $379.54 of that first $2,462.87 payment reduces what you owe — 15.4% of it. Every extra dollar you send skips the interest line entirely and lands on the balance, which means next month's interest is charged on a smaller number, which means slightly more of your normal payment goes to principal too. That compounding is the whole mechanism. How extra mortgage payments work walks through it month by month.