If you carry a balance on a credit card, the late fee is not the punishment you should be worried about. The penalty APR is. Skip one payment by more than 60 days and your rate can jump to 29.99 percent overnight, and the issuer can leave it there for months.
The reason this is worth understanding today: the CFPB just told the Office of Information and Regulatory Affairs it plans to reopen the credit card late fee rule, per Consumer Finance Monitor. The $8 cap the CFPB set in 2024 is in legal limbo, and issuers are lobbying to move it back up. Whichever way that fight lands, penalty APR is a separate lever the banks control on their own, with no cap and no vote.
Here is how it works.
Penalty APR is a higher interest rate the issuer applies when you break the terms of your cardholder agreement. Most commonly, that means a payment is 60 or more days late, per Credit Karma. Some agreements also let the issuer trigger it if a payment bounces or if you spend over your credit limit. The exact rules are in your cardholder agreement, not on the sign-up page.
The ceiling most issuers use is 29.99 percent. For scale: the average purchase APR on cards that carry interest was 22.15 percent in Q2 2026, per WalletHub. Jumping to 29.99 on a $5,000 balance costs an extra $393 a year in interest. That is real money, and it is happening because you missed one payment, not because the Fed moved.
Penalty APR usually maxes at 29.99 percent, per Credit Karma. That is nearly eight percentage points above the average purchase APR of 22.15 percent.
Here’s what they don’t tell you at sign-up. The 29.99 percent number is not a temporary blip. Under the Credit CARD Act of 2009, the issuer must review your account after six consecutive on-time minimum payments and restore the original rate on your existing balance. That protects the money you already owe. New purchases are a different story. The issuer can keep charging you the penalty rate on anything you buy after the trigger, and they can keep doing it indefinitely unless you call and negotiate it off.
Translation: one slipped payment can quietly re-price every purchase you make for the next year, with no fresh notice.
Not every card charges it. Discover and Capital One have leaned toward no penalty APR on most consumer cards. Apple Card has none, plus no late fee, no annual fee, no over-limit fee. Citi Simplicity is the same shape. Chase and American Express are mixed by card. If you do not know where your card lands, search the cardholder agreement PDF for “penalty.”
Do this now, before you need it.
Turn on autopay for at least the minimum on every open card. That is the one setting that shuts off most penalty APR triggers. If you are worried about overdrafts, set autopay to pull from a checking account with a small buffer and treat the buffer as untouchable.
Read your two heaviest-use cards’ agreements this week. Find the penalty APR line, note the trigger and the rate, and add a phone reminder for the day you hit six on-time payments after any past slip. That is the day the issuer has to act, and it is the day to call and ask them to remove the penalty on new purchases too.
If a card already has a penalty rate active on your account, call the number on the back and ask them to remove it. If you have kept it clean for six months, they must restore the rate on your existing balance under the CARD Act. Ask them to do the new-purchase rate at the same time. Get whatever they agree to in writing, in the app messaging log or a follow-up email.
The late fee fight will play out over the next year. Penalty APR is what actually costs you if you slip. Now you know.
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