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When Does Paying Off Debt Early Make Sense?
Summary
Paying off high-interest debt (like credit cards) early almost always makes sense. For lower-rate debt like a mortgage or student loans, the math depends on the rate, your risk tolerance, and how much you value the peace of mind of being debt-free.
You have an extra $500 this month. Do you put it toward your student loan or into your IRA? There’s a math answer and a feelings answer. The math says: compare the interest rate on the debt to the return you might get from investing. If the debt rate is high, pay the debt. If it’s low, investing might leave you wealthier in the long run.
But “wealthier in the long run” assumes you actually invest the money and leave it there. And for a lot of people, being debt-free is a huge relief. So the right answer can be “pay the debt” even when the math is close, because the peace of mind is worth something.
High-interest debt: pay it first
Credit cards, store cards, and other high-APR debt should usually be the first thing you attack. The interest is so expensive that it’s hard to beat by investing. Every dollar you put toward that debt is effectively earning whatever the APR is, risk-free. A Debt Payoff Calculator can show you how much faster you'll be done if you add an extra $100 or $200 a month. So unless you have no emergency fund at all, throwing extra money at high-interest debt is one of the best moves you can make.
Lower-rate debt: the tradeoff
Mortgages and many student loans have lower rates. Historically, a diversified stock portfolio has returned more than, say, a 4% mortgage rate over long periods. So in theory you could invest instead of paying extra on the mortgage and come out ahead.
In practice, that only works if you invest the money and don’t touch it. And you have to be okay with the risk that the market could do poorly for a while. If you’d sleep better with no mortgage, paying it off early is a valid choice even if the spreadsheet says invest. The “best” decision is the one you’ll stick with and not regret.
Definitions
- Opportunity cost
- What you give up by choosing one option. Paying off debt early means you don’t invest that money; investing means you keep paying interest on the debt.
FAQ
Should I pay off my mortgage early or invest?
If your mortgage rate is low (e.g. under 5%) and you’re comfortable with risk, investing the extra money can historically yield more over time. But paying off the mortgage guarantees a “return” equal to the interest you no longer pay and removes the debt. It’s a personal choice as much as a math one.
What about credit card debt?
Credit card APRs are usually high (often 15–25% or more). Paying those off early is almost always better than investing, because you’re unlikely to earn a higher return in the market than you’re paying in interest.