The lever that matters most: extra principal, applied early
Every extra dollar you put toward principal early in a mortgage avoids decades of compounding interest on that dollar, because interest is calculated on the remaining balance each month. On the $280,000, 6.5%, 30-year loan used as the default example in our mortgage calculator, an extra $200 a month starting from payment one cuts roughly 6-7 years off the loan and saves tens of thousands in interest — try it yourself by lowering the loan term in the calculator and comparing the new monthly payment to your extra-payment budget.
1. Make one extra full payment a year
Splitting your monthly payment in half and paying that half every two weeks (a 'biweekly' schedule) results in 26 half-payments a year — the equivalent of 13 full monthly payments instead of 12. That one extra payment goes entirely to principal if your lender applies it that way (confirm this with your servicer; some apply extra payments to next month's payment instead of principal, which defeats the purpose).
2. Round up every payment
Rounding a $1,769.79 payment up to an even $1,800 or $2,000 adds a small, painless amount to principal every month. It sounds trivial, but because it happens every month for the life of the loan, it compounds the same way the interest does — just in your favor instead of the bank's.
3. Apply windfalls directly to principal
A tax refund, bonus, or gift applied as a lump-sum principal payment immediately reduces the balance interest is calculated on for every remaining month of the loan. This is mathematically identical to earning a guaranteed return equal to your mortgage rate on that money — for a 6.5% mortgage, that's a better guaranteed return than most savings accounts offer.
4. Refinance to a shorter term when rates drop
Moving from a 30-year to a 15-year term at a lower rate can dramatically cut total interest, though it usually raises the monthly payment — run both scenarios through the mortgage calculator with your current balance as the new 'home price' and $0 down payment to see the real trade-off before deciding.
5. Recast instead of refinance, when eligible
A loan recast keeps your existing rate and term but re-amortizes the payment after a large lump-sum payment, lowering your required monthly payment without the closing costs of a full refinance. Not all lenders or loan types allow this — ask your servicer directly.
Frequently asked questions
Does paying extra always save money?
Yes, on the interest — but only if your lender applies the extra amount to principal immediately rather than holding it toward next month's payment. Always confirm how your specific servicer handles extra payments before relying on a payoff-date estimate.
Should I pay off my mortgage early instead of investing?
It depends on your mortgage rate versus your realistic investment return, and on how much you value the certainty of an early payoff versus the (historically higher, but not guaranteed) long-run return of investing instead. There's no universally correct answer — compare your mortgage rate against the CFPB's rate guidance and your own risk tolerance.
Last reviewed: September 2026. This guide is for general informational purposes only and is not financial advice.