Credit Card Rewards vs. Interest: Why 2% Cash Back Doesn't Offset a 24% APR
October 21, 2026
Credit card rewards, such as cash back, points, and miles, are marketed as a way to get paid for spending. They can be valuable if you pay your balance in full every month. But when you carry a balance, interest charges almost always exceed the value of rewards. A card that pays 2% cash back and charges 24% APR is giving you 2% on purchases while taking about 2% a month in interest on any unpaid balance, one-twelfth of 24%.
Consider someone who spends $1,000 a month ($12,000 a year) on a 2% cash back card. Rewards total $240 a year. If the person carries an average balance of $2,000, interest is about $480 a year, double the rewards.
Skip the math and get your answer instantly:
Open the Debt Payoff Calculator →The Break-Even Balance
Rewards value per year = spending × reward rate. Interest cost per year = average balance × APR. Setting them equal gives the break-even average balance: rewards ÷ APR. With $240 of rewards and a 24% APR, break-even is $1,000. Carrying an average balance above $1,000 means you lose more in interest than you gain in rewards. Even for a person who spends $3,000 a month ($36,000 a year, earning $720), the break-even balance is only $3,000.
In practice, most people who carry balances do so month after month, so the interest accumulates continuously.
| Annual spend | Rewards at 2% | Average balance carried | Interest at 24% | Net |
|---|---|---|---|---|
| $12,000 | $240 | $0 | $0 | +$240 |
| $12,000 | $240 | $1,000 | $240 | $0 |
| $12,000 | $240 | $2,000 | $480 | -$240 |
| $36,000 | $720 | $3,000 | $720 | $0 |
| $36,000 | $720 | $5,000 | $1,200 | -$480 |
Annual Fees and Premium Cards
Many rewards cards carry annual fees from $95 to $550 or more. The card is worthwhile only if the rewards, credits, and benefits you actually use exceed the fee. A $95 fee card earning 3% on $10,000 of qualifying spending in categories you use returns $300, a net $205, but a card earning 1.5% on all spending with no fee may beat it for someone with scattered spending. Calculate your own spending by category and evaluate the value of points based on how you redeem them. Points transferred to airline partners can be worth more than 2 cents each, but need effort and flexibility.
Be wary of spending more to earn bonuses, such as meeting minimum spend requirements on purchases you do not need.
Rules for Using Rewards Wisely
Pay the statement balance in full each month; set up autopay for at least the full balance. If you cannot, prioritize paying down balances before chasing rewards: moving to a 0% balance transfer or a low-rate loan may be better. Use one or two cards that match your habits and keep track of due dates. Redeem rewards for cash or high-value options, and watch for expiration terms. Keep your overall spending level the same: studies find that people tend to spend more with cards than with cash, which erodes the benefit of rewards.
Remember that merchant fees fund rewards, and may increase prices slightly for everyone, so the system benefits those who pay in full.
The Psychology of Rewards
Rewards can create the feeling of getting something for free and encourage spending. A 2% return on a purchase that you would not have made at all is a loss. Before buying, ask whether you want the item, not whether it earns points. A budget that includes the planned monthly spending on the card keeps the habit in check.
Frequently Asked Questions
Do rewards offset credit card interest?
Rarely. Interest rates of 20% or more far exceed typical rewards rates of 1% to 3%.
How do I calculate the break-even balance?
Divide annual rewards by the APR.
Is an annual fee card worth it?
Only if the rewards and benefits you use exceed the fee.
Should I carry a balance to build credit?
No. Paying in full each month builds credit without interest.
How do I get the most from rewards?
Pay in full, match the card to your spending categories, and redeem at good value.