Pay Off Credit Card Debt or Invest? Here's the Math

Published June 2026 · 5 min read

You have $5,000 in credit card debt at 19.99% APR and $5,000 in savings. Should you pay off the credit card or invest in the stock market? The math is straightforward — but the real-world answer depends on your interest rate, market expectations, and psychological preferences.

The Math: Credit Card Debt is a Guaranteed Negative Return

A 19.99% APR credit card costs you ~$1,000/year in interest on a $5,000 balance. The stock market averages ~7-10% long-term — meaning your invested $5,000 might earn $350-500/year. The gap is clear: paying off 20% debt is mathematically equivalent to earning a guaranteed, tax-free 20% return. No investment offers that.

Exception: Low-APR Debt (Under 5%)

A 0% APR balance transfer card or a 3% mortgage flips the math. If your debt costs less than expected market returns, investing makes more sense. But even then, debt payments are guaranteed while market returns are not. Run your specific numbers with our Credit Card Payoff Calculator.