A 0% introductory APR can be a genuinely useful tool. Moving a high-interest balance to a card with a temporary 0% rate can save money and help you pay down debt faster. Spreading a large purchase over a promotional period can also make sense. But these offers have rules, fees and side effects that are easy to miss, and they only work if you have a realistic plan to pay off the balance before the promotion ends.
This guide explains the rules using official CFPB guidance. We do not name or rank cards and do not state intro periods, fees or rates for any product. Read the issuer’s current pricing table before applying.
Two kinds of 0% offers
- Introductory APR on purchases. New purchases are charged a low or 0% rate for a set period.
- Introductory APR on balance transfers. Debt moved from another card is charged a low or 0% rate for a set period, usually only for transfers made within a certain window after opening.
Some cards offer both. Each has its own period and its own rate after the period ends.
What US rules say
The CFPB explains that an introductory rate on a new card or a balance transfer must generally stay in effect for at least six months, unless you are more than 60 days late on a payment. The issuer must tell you how long the introductory rate lasts and what rate applies afterwards. If the intro rate is variable, it can still change with its index.
The CFPB also confirms that a card company may charge a balance transfer fee even on a 0% offer. The fee is usually a percentage of the amount transferred or a fixed amount, whichever is higher.
The grace period trap
This is the rule that surprises most people. The CFPB explains that if you carry a transferred balance and use the same card for new purchases, those purchases will generally accrue interest from the date of the transaction, unless you pay the entire statement balance, including the transferred amount, by the due date. In 2014 the CFPB issued a bulletin warning issuers that marketing which fails to make this clear risks being deceptive.
Practical takeaway: use a different card, or a debit card, for everyday spending while you pay off a transferred balance.
0% intro APR is not the same as deferred interest
Store and retail financing often say “no interest if paid in full within 12 months”. The CFPB explains that this is deferred interest: if you do not pay the full promotional balance by the deadline, interest going back to the purchase date can be added. A true 0% intro APR does not charge back interest; after the period, the regular rate applies only to the remaining balance from then on.
How payments are applied
If you have a promotional balance and a regular balance on the same card, the CFPB explains that amounts you pay above the minimum must generally go to the balance with the highest rate first. How the minimum is applied is generally the issuer’s choice. For deferred-interest balances, the CFPB notes that you can ask the company to apply extra payments to the promotional balance near the end of the period.
Is a balance transfer worth it?
Do the arithmetic before applying:
- Add the transfer fee to the amount you will owe.
- Divide the total by the number of months in the intro period. That is the monthly payment needed to clear it in time.
- Check your budget. If you cannot afford that payment, estimate what will be left when the regular APR starts.
- Compare with alternatives, such as a fixed-rate personal loan or a repayment plan through a nonprofit credit counselor.
The CFPB’s guide to consolidating credit card debt also warns that taking on new debt to pay old debt rarely works unless spending is reduced.
A step-by-step plan
- Check your credit reports for free at AnnualCreditReport.com. Approval and your credit limit depend on your credit.
- Read the pricing table: intro period, transfer window, transfer fee, rate after the intro period and penalty rate.
- Transfer only what you can repay within the period.
- Keep paying the old card until the transfer shows as completed.
- Set up autopay for the monthly amount you calculated, not just the minimum.
- Stop using the card for new purchases.
- Diary the end date and review the balance two months before.
Official US government source. We are not a card issuer and do not take applications.
Frequently asked questions
Can I transfer a balance between two cards from the same bank?
Many issuers do not allow it. Check the terms.
Will a balance transfer hurt my credit?
Applying can cause a hard inquiry, and a new account changes your credit profile. Paying the debt down over time generally helps.
What happens if I pay late during the intro period?
If you are more than 60 days late, the issuer may be able to end the intro rate. Even one late payment can trigger a late fee.
Is the balance transfer fee refundable?
Generally no. It is added to your balance when the transfer posts.
Sources
- CFPB – How long can I keep a low intro rate?
- CFPB – What is a balance transfer fee?
- CFPB – Interest on new purchases after a balance transfer
- CFPB Bulletin 2014-02 – Promotional APR offers (PDF)
- CFPB – Promotional financing offers
Related guides
- How Credit Card Interest Works: APR, Grace Periods and Minimum Payments
- Cash Back Credit Cards: Flat-Rate, Category and Store Cards Explained
- Credit Card Fees Explained: Annual, Foreign Transaction, Cash Advance and Late Fees
- Secured and Credit-Builder Cards: How They Work and How to Use One Well
- Travel Rewards Credit Cards: How to Compare Miles, Points, Fees and Protections
Opportuly Careers is an independent guide. We are not a bank, lender or card issuer, we do not receive applications and this article is general information, not financial advice.
