Pay Off the Mortgage or Invest?

A guaranteed one. Every extra dollar against principal saves you the mortgage's interest rate, risk-free. Paying down a 6.5% mortgage is like earning a guaranteed 6.5% — something no safe investment matches. If you itemize and deduct the interest, the effective rate is a bit lower.

Because the expected return on a diversified portfolio over the long run has historically exceeded typical mortgage rates. If your investments earn more than your mortgage costs, investing leaves you wealthier — but that extra return is not guaranteed and comes with the risk of down years.

Paying extra produces a certain, known gain: interest saved plus a faster payoff. Investing produces an expected but uncertain gain. The calculator computes both: the guaranteed interest you'd save versus the projected (risk-adjusted) value of investing the same money. The bigger the gap between your investment return and your effective mortgage rate, the clearer the call.

A lot. Money in a 401k or IRA may come with an employer match and tax advantages that strongly favor investing — always capture a full match before paying extra on a low-rate mortgage. A taxable account loses some return to taxes, narrowing the gap versus a guaranteed payoff.

Peace of mind is real. A paid-off home lowers your required monthly expenses, which reduces stress, makes early retirement easier, and removes foreclosure risk if income drops. Many people rationally choose a guaranteed, emotionally satisfying payoff even when investing might win on paper.

First, build an emergency fund and capture any employer 401k match — both beat extra mortgage payments. Also pay off higher-interest debt (credit cards, car loans) before the mortgage. Extra mortgage money is also illiquid: once it is in the house, you cannot easily get it back without a refinance or sale.