Should you pay off a 6.5% mortgage or invest?
With a 6.5% mortgage and a 7% expected investment return, investing the extra money ends roughly $34,046 ahead after 30 years. But that's only the math on averages — paying off a mortgage is a guaranteed return and buys real peace of mind.
Why the mortgage rate decides it
Paying off a mortgage is a guaranteed return equal to the mortgage rate. Investing is an expected return with risk. So the comparison is simply 6.5% guaranteed vs ~7% (risky) expected:
- When the mortgage rate is well below your expected return (like 6.5% vs 7%), investing usually wins on average — your money compounds faster than the loan costs.
- When the mortgage rate approaches or exceeds your expected return, paying it off wins — and it's a certain win, with no market risk.
- Guaranteed vs risky matters. A paid-off house lowers your fixed costs and sequence-of-returns risk in retirement. Many people rationally choose the guaranteed return even when investing edges it out on paper.
Before you decide
A few things this comparison assumes you've already handled: capturing your full 401(k) match (an instant ~100% return that beats both), paying off any high-interest debt (credit cards dwarf a mortgage rate), and keeping an emergency fund. Money locked in home equity is hard to access without a sale or a HELOC — so don't pay down the mortgage with money you might need.
Assumptions: $450k home, 20% down, 30-yr term, an extra $12,000/yr toward principal, 7% investment return, 3% inflation, single filer. Mortgage interest is only deductible if you itemize — most people take the standard deduction, so this treats it as non-deductible. Model your own numbers in the calculator.
When the expected edge from investing nearly disappears
Investing usually wins the argument because stocks are expected to out-earn a mortgage over long stretches. That case rests on a gap between the rate you pay and the return you expect — and as the rate climbs toward the range of realistic long-run returns, that gap narrows toward nothing.
At a rate this high, the comparison is no longer a wide expected margin against a guarantee; it is a slim, uncertain maybe against a sure thing. Even in the scenarios where investing still edges ahead on paper, the extra reward is thin and it is not promised. Meanwhile the payoff return is fixed, arrives regardless of what markets do, and is effectively tax-free.
That is the rare case where one option is better on both axes that matter: it can match or beat the expected return and it removes the risk. When the guaranteed choice stops costing you meaningful expected growth, the usual reason to favor stocks — that they should simply earn more — loses most of its force. Paying down a rate in this territory is hard to argue against.
Common questions
Should I pay off a 6.5% mortgage or invest?
On average, investing wins by about $34,046 over 30 years because a 7% expected return beats the 6.5% guaranteed by paying it off. But paying off is guaranteed and risk-free, which many people rationally prefer.
Is it worth paying off my mortgage early?
Financially it's worth it when your mortgage rate is at or above your expected after-tax investment return. Below that, investing usually builds more wealth — though a paid-off home reduces risk and fixed costs, which has real value beyond the math.
What should I do before paying extra on my mortgage?
Capture your full 401(k) match, clear high-interest debt (credit cards), and hold an emergency fund first — each of those beats extra mortgage payments. Only then does paying down a low-rate mortgage compete with investing.