Pay Off Mortgage vs Invest

It depends on your mortgage rate, expected investment return, time horizon, tax situation, and risk tolerance. As a rule of thumb, if your after-tax mortgage rate is higher than the expected after-tax return on your investments, paying down the mortgage wins on a risk-adjusted basis. With today's 6-7% mortgage rates, the math has shifted heavily back toward paying down the mortgage compared to the 3% rate era. This calculator runs both scenarios month-by-month and shows the personal break-even return where they tie.

The break-even return is the annual investment return that makes the "Invest" scenario produce exactly the same net worth as the "Pay Off" scenario. If you believe your portfolio will earn more than the break-even rate (after taxes and fees), investing wins. If not, paying down the mortgage wins. The calculator solves this by binary search using your actual mortgage balance, rate, term, and extra payment amount, so the answer is personalized — not a generic 7% rule of thumb.

For most homeowners since the 2017 Tax Cuts and Jobs Act, no. The 2025 standard deduction is $15,000 (Single) and $30,000 (Married Filing Jointly), and SALT deductions are capped at $10,000. Unless your mortgage interest plus other itemized deductions exceeds the standard deduction, you receive zero federal tax benefit from mortgage interest. Even when itemizing, only the portion above the standard deduction provides marginal benefit — most calculators get this wrong.

Paying down a mortgage produces a risk-free, after-tax return equal to your mortgage interest rate. If your rate is 7%, every dollar of extra principal payment saves you 7% per year on the avoided interest, guaranteed, with zero market risk. Compare this to a stock portfolio expected to earn 8-10% before taxes and 6-8% after taxes — but with significant volatility. The guaranteed nature is why pay-down often wins on risk-adjusted basis.

Almost never. Always capture your employer 401(k) match first — that is an immediate 50-100% return that no mortgage payoff can match. After capturing the match, the decision between extra mortgage payments and additional investing is a much closer call and is exactly what this calculator helps with. Also fund a Roth IRA up to the limit before mortgage prepayment if your tax bracket is in the 12-24% range.

This is the often-ignored downside of paying off your mortgage: home equity is illiquid. If you lose your job or face a medical emergency, you cannot easily withdraw the extra principal you paid. A taxable investment account can be liquidated in 2 business days. Many financial planners recommend keeping a 6-month emergency fund in cash plus enough liquidity in investments before aggressively prepaying a mortgage.

Yes. If you are within 10 years of retirement, the value of guaranteed return on mortgage payoff increases relative to expected stock returns. A bear market in your last few working years can devastate the "Invest" strategy if you have to start drawing from a depleted portfolio while still owing mortgage payments. Many retirees prioritize entering retirement debt-free for exactly this reason, even when the math slightly favors investing.

Three reasons: (1) we model tax drag on the taxable investment account (default 15%) which most calculators ignore, making investing look better than reality; (2) we apply the mortgage interest deduction only to the portion above the standard deduction, not the full interest amount; and (3) after the mortgage is paid off in the Pay Off scenario, we redirect the entire previous payment plus the extra into investments — most calculators stop the simulation at payoff, which understates the true net worth comparison.