Should I pay off debt or invest?

It depends on your debt's interest rate. Above 7%: prioritize debt payoff — the guaranteed return exceeds expected market returns on a risk-adjusted basis. Below 4%: invest — you'll almost certainly earn more in the market. Between 4–7%: split, but always capture the full employer 401k match first regardless of debt rate.

Should I max out my 401k before paying off debt?

Always capture the full employer match first — it's a guaranteed 50–100% return on your contribution, which beats paying off any debt. Beyond the match, it depends on debt rates. Above 7% debt: pay debt before contributing beyond the match. Below 5% debt: max the 401k, then Roth IRA, then pay extra on debt.

What is the guaranteed return on paying off debt?

Paying off a debt at 20% APR gives a guaranteed, risk-free 20% return on every dollar applied. No investment reliably returns 20% — the long-run stock market average is 7–10% nominal, with significant volatility. High-rate debt payoff is one of the best risk-adjusted returns available to most people.

Does it make sense to invest while carrying credit card debt?

Rarely, unless you're capturing a 401k employer match. The expected investment return (7–10% nominal, 4–7% real after inflation) is lower than your credit card APR (18–29%). You're effectively borrowing at 22% to invest at 7% — a guaranteed loss. Pay off credit cards before investing beyond the employer match.

Pay Off Debt or Invest? How to Decide (With Real Math)

The debate between paying off debt and investing has a real answer — and it's not "do both equally." Here's the math and a decision framework that works.

The core principle: compare the guaranteed return

Paying off a debt at 20% APR is a guaranteed, risk-free 20% return on every dollar applied. There is no investment that reliably returns 20%. The stock market has historically returned 7–10% nominal, but with significant volatility — in any given year, it can lose 30–40%.

Debt payoff gives a guaranteed return equal to the interest rate. Investing gives an expected return that's uncertain. For high-rate debt, the guarantee wins.

The crossover framework

Debt interest rate	Recommended priority	Reasoning
Above 7%	Pay off debt first	Guaranteed return exceeds expected market return on risk-adjusted basis
5–7%	Split — do both	Close enough that personal preference and risk tolerance should decide
Below 5%	Invest (beyond emergency fund)	Expected market returns historically exceed low-rate debt cost
Below 4%	Invest aggressively	Long-term market returns significantly outpace low-rate debt cost

The employer 401k match: always comes first

This is non-negotiable regardless of debt rate. If your employer matches 50% of contributions up to 6% of salary, that's a guaranteed 50% return on the first 6% of income you contribute. No debt has an interest rate that makes it worth passing up a 50% guaranteed return.

Capture the full employer match before directing extra money to debt. That's the floor. Everything beyond the match follows the crossover framework above.

Real math: $10,000 to deploy

Scenario: you have $10,000 and a choice between paying off a credit card at 22% or investing in the market.

Paying off debt: Guaranteed savings of $2,200/year in interest. In 10 years, the compounded effect of not paying that interest plus investing the freed-up payment: approximately $38,000 in additional net worth.

Investing instead: $10,000 invested at 8% average for 10 years = $21,589. But you're still paying $2,200/year in interest — $22,000 over 10 years. Net: you're roughly even or behind.

At 22% debt, paying off the debt and then investing the freed payment wins decisively.

The psychological factor

There's a real argument for paying off debt beyond the math: debt creates psychological burden that affects decision-making, risk tolerance, and life choices in ways that compound over time. Some people perform better in their careers and make better financial decisions without the constant mental weight of debt. This is worth something — and it's not captured in interest rate comparisons.

If you're in the 5–7% gray zone and you know carrying debt stresses you out significantly, weight the psychological factor toward payoff. If you're calm about it and disciplined, weight toward investing.

The split approach for the gray zone

For debt between 5–7%, a split that many financial planners recommend:

Capture full employer 401k match
Build 3–6 month emergency fund
Split extra money 50/50: half to debt extra payment, half to Roth IRA
Adjust the split as you get closer to debt-free