Should you pay off debt or invest? A simple framework
"Should I pay off my debt or invest the money?" is one of the most common money questions — and the answer is more rule-based than it feels. At its core, paying off debt is a guaranteed return equal to the interest rate, while investing is an uncertain return. The decision is mostly about comparing the two.
The core comparison
Paying off a loan at 20% APR is the same, financially, as earning a guaranteed, tax-free 20% on your money. Almost no investment reliably beats that. So high-interest debt almost always wins.
For low-interest debt — say a 4% loan — the long-run expected return from a diversified investment portfolio may be higher, which can tip the balance toward investing. The crossover point is roughly where your debt's interest rate meets your realistic expected return.
Two rules that come first
Before optimizing, protect yourself:
- Keep a small emergency fund. Without one, a surprise expense pushes you straight back into high-interest debt, undoing your progress.
- Capture any employer retirement match. A 50–100% match is an instant return no debt payoff can beat — always take the free money first.
A simple framework
- Debt above ~8–10% (credit cards, payday loans): pay it off aggressively before investing.
- Debt around 4–7%: split — invest for the long term while steadily overpaying the debt.
- Debt below ~4%: usually invest, while paying the minimum, if you're comfortable with the risk.
To see how much faster extra payments clear a balance — and how much interest they save — run the numbers in the Loan Payoff Calculator. Even an extra $100 a month can save thousands on a high-rate balance.
Don't forget the psychology
The math is only half the story. For some people, being debt-free brings a peace of mind that's worth more than a slightly higher expected return. If your debt keeps you up at night, paying it down faster is a perfectly rational choice even when a spreadsheet says otherwise.
The bottom line
Secure a small emergency fund and your employer match, then attack any high-interest debt — it's a guaranteed return you can't easily beat. For low-interest debt, investing often wins, but there's no wrong answer if becoming debt-free helps you sleep. Model your payoff first with the Loan Payoff Calculator.