Compare your mortgage's interest rate to what you realistically expect to earn investing. If your mortgage rate is higher, paying it down wins. If your expected investment return is meaningfully higher, investing tends to build more wealth — with real market risk a guaranteed payoff doesn't have. At typical 2026 mortgage rates (around 6-7%), it's usually a close call, not an obvious one either way.
That's the whole framework in two sentences. Everything below just fills in the details — a worked example with real numbers, the things that can tip the decision one way or the other, and what to do before you even get to this question.
Do This First, Before Comparing Anything
- Capture your full employer 401(k) match, if you have one. It's typically an instant 50-100% return — nothing else on this page comes close.
- Pay off higher-rate debt like credit cards first. If it's costing you 20%+, that's not a close call the way a mortgage is.
Only after both of those does the mortgage-vs-invest question actually apply to what's left over.
A Worked Example
Say you have $500 a month in extra cash. Your mortgage rate is 6.69% (today's average 30-year rate). You're comparing that against investing at a commonly-cited long-run stock market average of around 8%.
| Path | Rate Used | Value After 20 Years |
|---|---|---|
| Extra toward mortgage | 6.69% (guaranteed) | ≈ $250,900 |
| Invested instead | 8% (expected, not guaranteed) | ≈ $294,500 |
In this example, investing comes out about $43,600 ahead over 20 years — but notice the gap isn't huge relative to either number, and the mortgage path is guaranteed while the investing path depends on the market actually delivering that average. That's what "genuinely close" looks like in real numbers, not just a talking point.
But Not Everyone Has Today's Rate
That example uses today's average rate. A lot of homeowners locked in far lower rates a few years back — 3.5% wasn't unusual. For them, this isn't a close call at all.
| Path | Rate Used | Value After 20 Years |
|---|---|---|
| Extra toward mortgage | 3.5% (guaranteed) | ≈ $173,400 |
| Invested instead | 8% (expected, not guaranteed) | ≈ $294,500 |
At 3.5%, investing pulls ahead by roughly $121,000 instead of $43,600 — almost three times the gap. Your actual rate is the single biggest input in this whole decision. If you locked in a low rate years ago, this "close call" post applies a lot less to you than it does to someone borrowing at today's rates — worth running your specific number rather than assuming either example above is yours.
What Can Tip the Decision
- Your actual rate. A 5% mortgage tilts toward investing more than a 7.5% one does — run your real numbers, not the national average.
- Taxes. If you itemize, your real mortgage cost may be a bit lower than the sticker rate.
- Risk tolerance. The guaranteed payoff has zero chance of a bad outcome. Investing doesn't.
- Peace of mind. Some people value being mortgage-free enough that it's worth choosing even if the math slightly favors investing.
- Liquidity. Money paid into your mortgage is harder to access later than money in a typical investment account.