How Credit Card APR Actually Works
APR only matters if you carry a balance — here's what it costs you, in real numbers.
If you pay in full monthly, APR is nearly irrelevant to you
APR only applies to a carried balance. Someone who pays their statement in full every month can largely ignore the APR when choosing a card.
What APR actually charges you for
Annual Percentage Rate is the cost of carrying a balance past your due date, expressed as a yearly rate but typically applied to your balance daily. Most cards use a grace period: if you pay your full statement balance by the due date, no interest is charged at all, regardless of the card's APR.
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Why average APRs have climbed
Card issuers price APR based on the prime rate plus a margin tied to your creditworthiness. When benchmark interest rates rise, variable APRs on essentially every card rise with them, which is why the 'average' credit card APR has trended upward over recent years industry-wide.
The one number that matters if you do carry a balance
If you're carrying debt, the APR spread between cards matters far more than any rewards rate — a few points of APR difference on a real balance typically costs more per year than the cash back you'd earn. In that situation, prioritize a 0% intro APR balance transfer card or the lowest ongoing APR you qualify for, and treat rewards as secondary.