Credit card rewards programs are one of the most sophisticated financial products ever created — sophisticated in the sense that they appear to benefit the consumer while actually generating enormous profit for the issuer. Here's the actual math for people carrying balances.
The Rewards Rate Reality
The best consumer rewards cards offer 1.5-5% cash back or equivalent points on purchases. The average across all purchases is typically 1.5-2% for most people's spending patterns.
The interest rate on the same cards: 22-28% APR.
If you carry a $5,000 balance, you're paying approximately $1,100/year in interest to earn approximately $150-200 in rewards on $10,000 of spending. You are paying $1,100 to receive $175. This is not a good trade.
When Rewards Cards Are Genuinely Valuable
Rewards cards are beneficial when: you pay your balance in full every month without exception, you spend enough in bonus categories to earn meaningfully (heavy travel, business expenses), and you use the rewards rather than letting them expire. In this scenario, the card company is subsidizing your spending because they're betting on the majority of cardholders who do carry balances.
The Psychological Trap
Rewards programs cause people to spend more — research consistently shows this. The framing of "earning rewards" shifts the mental accounting from "spending money" to "getting something." Marketing language matters: people spend differently when told they're "earning 3% back" vs. "spending money with a 97% effective cost."
The Debt Payoff Decision
While paying off credit card debt: the rewards aren't worth the psychological permission they grant to use the card. Use debit, pay down the balance, and revisit rewards cards when you can pay them in full each month. The rewards available to someone who carries no balance are far more valuable than rewards earned on a balance paying 25% interest.