Pay off your mortgage early: 3 US strategies compared

On a $380,000 loan at 6.50% over 30 years, your baseline is $2,402/month in principal and interest and roughly $484,669 paid in total interest over the life of the loan. Three strategies can change that outcome by a wide margin. A single $20,000 extra payment in year one saves roughly $101,298 in total interest and cuts the payoff date by about 4.2 years. A recurring $300/month extra from day one saves roughly $147,079 and ends the loan about 7.8 years early. Adding $200/month (the US equivalent of accelerated bi-weekly on this payment) saves roughly $110,461 and closes out the loan about 5.8 years ahead of schedule. This is for US borrowers who want to pay less over time and are trying to figure out which approach fits their situation.

The scenario modeled

All three strategies start from the same baseline loan. Homeowner expenses (taxes, insurance, HOA) are excluded from the figures below so the interest comparisons are clean P&I math.

The three strategies layered on top of this baseline:

Strategy 3 deserves a note. Most US lenders do not offer formal accelerated bi-weekly programs the way Canadian lenders do. The practical equivalent is adding $200/month to your regular payment, which is your monthly P&I ($2,402) divided by 12. That adds up to one full extra payment per year, producing nearly identical results to accelerated bi-weekly. The calculator's accelerated bi-weekly mode applies the same math automatically.

The findings

Strategy 1: $20,000 one-time payment at month 1

Applying $20,000 to principal on the first bill reduces your outstanding balance immediately, which means less interest accrues on every single payment that follows. The effect compounds over decades.

Your monthly payment does not change. The entire benefit comes from the shorter remaining balance and the interest it no longer accrues. The catch is obvious: you need $20,000 available to deploy in month one.

Strategy 2: $300/month recurring extra payment

Adding $300 to every monthly payment is the most mechanically straightforward of the three. You commit to a fixed amount, set it and forget it, and the loan pays off early.

The interest savings here are the largest of the three strategies because you are reducing principal continuously from month one, on every payment, for years. The $300 extra also costs you the most in monthly cash flow.

Strategy 3: Accelerated bi-weekly equivalent ($200/month)

This strategy costs less per month than Strategy 2, but still delivers one full extra payment per year. The mechanism is simple: your regular payment stays at $2,402, and you add $200 each month, totaling $2,602/month on average.

The savings are smaller than Strategy 2 because you are adding less each month, but the payoff still comes years ahead of the baseline.

Why early extra payments matter more than later ones

All three strategies apply extra dollars in the early years. That timing matters. On a 30-year mortgage, the first five years are almost entirely interest: on this $380,000 loan, roughly 86% of each early payment goes to interest rather than principal. When you reduce the balance in year one or two, you are cutting the base on which all that interest is calculated. The same $20,000 applied in year 20 would save far less, because the balance is already much lower and there are fewer years left for the savings to compound. The calculator shows this directly if you move a one-time payment from month 1 to month 120 and compare the outputs.

US context

The CFPB notes that for most conventional mortgages, there is no prepayment penalty, meaning any extra principal payment reduces your balance immediately with no fee. This is standard for conforming loans (loans that meet Fannie Mae and Freddie Mac guidelines), which cover the majority of US mortgages. If you have an older loan or a non-conforming product, confirm with your servicer that extra payments go directly to principal, not to future scheduled payments.

Source: Consumer Financial Protection Bureau, "Make one extra mortgage payment a year," accessed May 2026. URL: https://www.consumerfinance.gov/ask-cfpb/what-if-i-want-to-pay-off-my-loan-early-en-205/

When this applies - and when it doesn't

These strategies make sense when: You plan to stay in the home long enough to capture the payoff benefit. Strategy 2's 7.8-year payoff acceleration only pays off if you are still in the loan by that point. If you sell in year 7, the recurring extra payments still helped (you will carry a lower balance at closing), but the full interest savings never materializes.

Your mortgage has no prepayment penalty. As noted above, most conforming US loans do not. But some portfolio loans and older adjustable-rate products do carry penalty clauses, sometimes for the first 3-5 years. Read your loan documents or call your servicer before adding extra payments.

You have no higher-rate debt. Adding $300/month to a 6.50% mortgage while carrying a credit card at 22% is the wrong order. Pay the higher-rate debt first.

These strategies make less sense when: You are in the early years of a refinance with high closing costs. If you just paid $8,000 to refinance, you have a break-even period to recoup before extra payments make mathematical sense. Model the refinance break-even separately.

You are holding the loan in a rental or investment context where the mortgage interest is fully deductible. The net after-tax cost of the interest is lower, which changes the math on whether aggressive payoff is the highest-return use of that cash.