Debt vs. investing
Short answer: it depends on the interest rate on your debt, and there's one exception that comes before both. Here's the honest breakdown, no hedging.
Paying off a debt is a guaranteed return equal to that debt's interest rate. Pay off a credit card charging 24% APR, and you've just earned a guaranteed 24% return on that money — no market in the world reliably beats that. Investing, on the other hand, has averaged roughly 7–10% a year over long stretches, but with no guarantee in any given year.
So the rule of thumb: if a debt's interest rate is higher than what you could realistically expect to earn investing, paying it off first isn't just safer — it's mathematically the better move.
Rough cutoff: above about 7–8% interest, lean debt payoff first. Below that (some auto loans, subsidized student loans), the math gets closer, and it's reasonable to split the difference or lean investing.
If your employer matches retirement contributions and you're not capturing the full match, grab that first — before extra debt payments, before anything else. An employer match is an instant, guaranteed return (often 50–100%) that no debt payoff can compete with. Once you're capturing the full match, go back to the interest-rate math above.
Debt carries a psychological cost that doesn't show up in a spreadsheet. If high-interest debt is keeping you up at night, there's real value in clearing it faster than the math strictly requires — a plan you can't stick with isn't actually the optimal plan. That's exactly why this isn't just a calculator question.
Every situation is different — your actual mix of income, debt, savings cushion, and investing already-in-motion changes which of these applies to you.
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