What is a penalty APR?
A penalty APR is a higher rate an issuer can apply after a serious delinquency — and unlike most rate increases, it can apply to the balance you already carry. It is the most expensive consequence of a late payment, and it is escapable.
What triggers it
Typically a payment more than 60 days late, though the specific triggers are set out in your cardholder agreement and can include a returned payment or breaching the terms in other ways. It is not the consequence of being a few days late — that is a late fee. The penalty rate belongs to a more serious category of delinquency.
Why it costs more than it looks
Most rate increases apply only to new purchases; your existing balance keeps its old rate. A penalty APR triggered by a payment more than 60 days late can be applied to the balance you already owe. On a large carried balance, that repricing dwarfs any late fee — and the payoff calculators here will show you the difference between the two rates in months and dollars.
The six-month rule that gets it removed
Where a penalty rate has been applied to an existing balance after a payment more than 60 days late, the issuer must review the account and restore the prior rate on that balance if you make six consecutive on-time minimum payments. That is a real, specific escape route rather than an appeal to goodwill — six months of not missing, and the old rate returns to the old balance.
Asking, before the six months
Issuers have discretion, and a call explaining what happened on an otherwise good account is sometimes enough. It costs a phone call. But the six-payment path is the one that does not depend on anybody's mood, so set up autopay for at least the minimum and let the clock run regardless of how the conversation goes.
What it does to your payoff plan
If a penalty rate has been applied, the numbers in any plan you built are now wrong — the payoff date has moved and the interest total has risen. Re-run the plan with the new rate to see the real position. That is unpleasant reading, and it is also the argument for the six-payment run: a specific date on which the arithmetic improves again.
This page explains the mechanism. The arithmetic is one click away.
Open the Credit Card Payoff calculator →Frequently asked questions
What triggers a penalty APR?
Can a penalty APR apply to my existing balance?
How do I get a penalty APR removed?
Does a penalty APR show on my credit report?
Should I stop using the card?
Official sources
Get a quarterly nudge to re-check your numbers
Four emails a year: a reminder to re-take your numbers, and what changed in the guidance behind these tools. No spam, unsubscribe any time.
Double opt-in: you will get one confirmation email and nothing else until you click it.