You owe interest on a 0% APR credit card. How did that happen?

Many Americans have turned to credit cards to deal with their expenses — and their debt. If you’re someone who has to carry a card balance, tools like a 0% introductory APR credit card can make it more manageable.

But if you recently opened a credit card with a 0% intro APR and were surprised to discover you now owe interest on your balances, you may wonder, “Why am I being charged interest on a 0% APR?” Here’s why you may owe interest on a 0% intro APR card and what you can do about it.

Why did I get an interest charge on a 0% APR credit card?

If you apply for and start using a 0% intro APR credit card without paying attention to the offer and the details, you could get stuck with more interest than you bargained for. Here are the five most common reasons why you might now owe interest on a 0% intro APR credit card:

1. The intro offer expired

This is one of the most common reasons that balances on 0% introductory APR credit cards begin to earn interest. Once the promotional period ends, the ongoing and often variable APR will apply to any balance remaining, as well as all new purchases and balance transfers.

It’s easier than you might think to lose track of when your promotional period ends, thinking you have more time to pay off their purchases or balance transfers than you do. Check your credit card statement or card agreement to find out whether your introductory period has ended.

2. The 0% intro APR offer only applied to certain transactions

Another common issue is misunderstanding the kinds of transactions included in the card’s 0% intro APR offer. You may have expected that your offer could be used for both purchases and balance transfers, but that isn’t always the case.

For example, the Citi Double Cash® Card only offers a 0% intro for 18 months on Balance Transfers, not purchases, then a 18.24% - 28.49% (Variable) APR applies.

If you make purchases on a credit card with only an introductory offer for balance transfers, those purchases will begin accruing interest at the standard rate. The same goes for transferring debt to a credit card with only an introductory offer on purchases. Additionally, cash advances are also typically excluded.

Your card agreement will state what kinds of transactions are covered by the introductory offer, as well as the APRs for the transactions that may not be covered.

3. A late payment voided the APR period

When you open a new credit card, you’ll receive a monthly statement at the end of your billing cycle. This credit card statement contains a lot of important information, including charges you made for the previous month and any interest or fees you owe.

It will also include the minimum payment you need to make by the due date each month — even if you’re taking advantage of a 0% intro APR offer. Failure to pay at least that amount by the due date may void the terms of your introductory offer.

4. You missed a deadline

A balance transfer can help you save a lot of money, especially if you transfer your debt from a high-interest credit card to one with an introductory 0% APR offer. But depending on the credit card, you may have a limited amount of time within the introductory period to make the balance transfer.

Some credit cards only give you a few months from account opening to make your balance transfers, such as the Bank of America® Customized Cash Rewards credit card, which offers a 0% introductory APR for 15 billing cycles on purchases and balance transfers made within the first 60 days (then 17.49% - 27.49% Variable APR on purchases and balance transfers).

If you missed the 60-day window to transfer your debt to the BofA Customized Cash Rewards card, for instance, you could simply be seeing standard rates and fees on your credit card statement.

5. You didn’t qualify for the 0% intro APR offer

It’s possible to qualify for a credit card but not the promotional offer. This can happen when you respond to a credit card offer you received in the mail or your inbox. People sometimes assume it’s the same as the offer they see online, but it may not be.

Depending on your creditworthiness, a card issuer may send you a personalized offer that is different from the general offer found online. If you have excellent credit (or a FICO score of at least 800), this can work in your favor, and you may receive a higher welcome bonus or a lower interest rate than advertised. But if you don’t have great credit, you may lose out on select features like the 0% introductory offer.

If you assumed your new credit card came with a promotional offer that it didn’t, you will most likely end up paying interest on your credit card balances.

6. The card’s grace period is voided

Most issuers offer a grace period — you won’t be charged interest on new purchases if you pay your balance in full by the due date. But if you are carrying a balance, you’ll start accruing interest on your unpaid balance and any new purchases. This unpaid balance could include a balance from a balance transfer. So any new purchases would start accruing interest immediately if you are paying down debt from a balance transfer.

What to do if you owe interest on a 0% APR card

If you’re charged interest on a 0% introductory APR card, the first step is to find out why. Start by checking your credit card statement. Make sure to read and understand the card’s fine print and cardholder agreement to ensure you followed the terms and conditions. If something is unclear, contact your card issuer and ask.

Once you’ve verified that the interest charges are accurate, plan how you’ll pay off this credit card debt. This may be as easy as opening a new 0% APR card, transferring the balance over and paying that card down. The most important part, however, is to create a repayment plan you can stick to. It’s also a good idea to avoid adding to the balance until you pay it off. Otherwise, you’re risking getting even further into debt.

The bottom line

With responsible use, 0% intro APR credit cards can help you strategically save money on upcoming purchases or pay off past debts — but only if you can avoid interest charges. And since current credit card interest rates sit at right around 20%, one of these cards could save you hundreds of dollars a year or more, as long as you play by the rules found in your credit card agreement.

If you recently opened one, only to discover you still have to pay interest charges, you don’t have to feel discouraged. By knowing why this happened and coming up with a plan to pay down your debt, you can avoid this situation in the future.

The Bank of America content in this article was last updated on Aug. 20, 2026.