Decision · Debt
Pay off debt or invest?
If you have extra cash each month, where does it earn more? Compare aggressively paying debt down and then investing, versus investing from day one while paying the minimum.
A Debt first, then invest
Debt-free in-
Investment value-
Net wealth-
B Invest from day one
Remaining debt-
Investment value-
Net wealth-
Rule of thumb
If your debt rate is higher than your expected investment return, paying it off usually wins. If your return is higher, investing often wins — but guaranteed debt interest is a certainty; investment returns aren't.
Net wealth over time
Debt vs invest — frequently asked questions
Should I always pay off high-interest debt first?
Almost always, yes. If your debt rate is higher than the return you realistically expect from investments (after taxes), the math says pay the debt. Credit cards at 18–25% APR are nearly impossible to out-earn in the market.
What investment return should I assume?
A common planning assumption is 6–8% annually for diversified stock/bond portfolios over long periods, but real returns vary. Use a conservative number (5–6%) if you want a margin of safety in your decision.
Does tax-advantaged investing change the answer?
Yes, meaningfully. Employer matches on 401(k) contributions are an instant 50–100% return and almost always beat paying extra on moderate-rate debt. Adjust your expected return downward by your tax rate for taxable accounts to get a fair comparison.
Financial guides to go deeper
Short, practical reads that pair with our calculators.
Compound Interest vs. Loan Interest
Why the same force that builds wealth also keeps debt spiraling.
Credit CardsHow to Pay Off Credit Card Debt Faster
Snowball vs. avalanche and the fixed-payment discipline that beats both.
LoansThe Surprising Power of Extra Payments
Real numbers on how $50–$200 extra per month reshapes any long-term loan.