The math usually favors investing, but the full answer depends on three numbers: your mortgage interest rate, the after-tax return you expect from investments, and how much you value the feeling of being debt-free.
If your mortgage rate is 3% or 4%, the stock market has historically returned around 7–10% annually over long periods—so the spread is real. Putting an extra $500 a month into a diversified index fund instead of toward your mortgage principal could leave you tens of thousands ahead after 20 years. But those investment returns are not guaranteed, and the mortgage payoff is—every extra dollar you put toward principal is a guaranteed, tax-free return equal to your interest rate.
If your rate is 6% or higher, the math flips: a guaranteed 6% return starts looking competitive with what you’d expect from the market, and paying down the mortgage early becomes the safer play. Liquidity matters too. Money you put into your house is hard to get back out without selling or refinancing. If you don’t have a solid emergency fund yet, build that first before accelerating either path.
Sources
This is general information, not professional financial advice. For decisions about your situation, talk to a qualified professional.
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