A 0% interest card gives you a set period—usually 6 to 21 months—where new purchases or balance transfers accrue no interest, then the regular rate kicks in
The card issuer charges you nothing on the balance during the promotional period. After that period ends, any remaining balance gets charged the card's standard interest rate, which typically ranges from 16% to 24% depending on your credit score and the issuer. The catch is that the 0% offer applies only to what you specify when you open the account: either new purchases, balance transfers, or sometimes both. A card that offers 0% on purchases will still charge you interest on a balance transfer you make later.
These cards are not information programs. They are a timing tool. If you carry a balance and know you can pay it off before the promotional period ends, a 0% card saves you the interest you would otherwise owe. If you cannot pay it off in time, you end up paying more interest than you would have on a regular card, because the regular rate applies to the full remaining balance all at once.
Key Takeaways
- The 0% rate applies only to the category you choose at signup—purchases, balance transfers, or both—and only for the promotional period stated in the offer.
- After the promotional period ends, any unpaid balance is charged the card's regular interest rate, which can be 16% to 24% or higher.
- Balance transfer cards often charge an upfront fee (2% to 5% of the amount transferred) even though the interest is free during the promotion.
- You need a credit score of roughly 670 or higher to be considered for most 0% offers, and the best rates go to people with scores above 740.
- The strategy only saves money if you pay off the balance before the promotional period ends or transfer it to another 0% card before interest kicks in.
How the promotional period works
The issuer sets a fixed end date for the 0% rate when you open the account. Common promotional lengths are 6 months, 12 months, 18 months, and 21 months. The longer the period, the lower your credit score usually needs to be to may have access to—a 21-month offer typically requires a score above 750, while a 6-month offer may be available to people with scores in the 650s.
The promotional period starts on the date you open the account, not the date you make your first purchase or transfer. If you open a card on March 15 with a 12-month 0% offer, the rate expires on March 15 of the following year, regardless of when you actually use the card. This matters because it means waiting to use the card does not extend the promotional window.
Once the promotional period ends, the regular interest rate applies to any balance you still owe. The issuer will notify you in writing before the period ends, usually 30 to 60 days in advance, and will tell you the new rate. At that point, interest accrues daily on the remaining balance until you pay it off.
Balance transfers versus new purchases
A balance transfer moves debt from another card to the 0% card. You pay the issuer a one-time fee—typically 2% to 5% of the amount transferred—but then owe no interest on that amount for the promotional period. If you transfer $5,000 with a 3% fee, you pay $150 upfront and then have 12 months (or however long the promotion lasts) to pay off the $5,150 with no interest charges.
A 0% on purchases offer means new charges you make on the card accrue no interest during the promotional period. There is no upfront fee. However, if you also have a balance transfer on the same card, most issuers explore your payments to the balance transfer first, leaving the new purchases to accrue interest after the promotional period ends. This is why many people open one card for balance transfers and a separate card for new purchases if they need both.
Some cards offer 0% on both purchases and transfers, but the promotional periods are often different—for example, 0% for 12 months on purchases but only 6 months on transfers. Read the terms carefully, because the offer is specific to what the issuer states.
Credit score requirements and approval odds
Credit card issuers use your credit score to decide whether to offer you a 0% promotion and how long the period will be. A score of 670 or higher generally makes you may be able to access for some 0% offer, but the best terms go to people with scores above 740. If your score is below 670, you are unlikely to receive a 0% promotional offer from major issuers.
Your score also affects the regular interest rate that applies after the promotional period ends. Someone with a 750+ score might see a regular rate of 16% to 18%, while someone with a 680 score might see 22% to 24% on the same card. This matters because if you cannot pay off the balance before the promotion ends, you will pay significantly more interest if your score is lower.
The issuer also looks at your income, existing debt, and payment history. Even with a good score, approval is not may provide. If you have recently opened multiple cards or have high balances on existing cards, the issuer may decline the offer or offer a shorter promotional period.
When a 0% card actually saves you money
A 0% card saves money only if you have a specific plan to pay off the balance before the promotional period ends. If you carry a $3,000 balance on a regular card charging 20% interest, you owe roughly $600 in interest per year. Moving that balance to a 0% card for 12 months saves you that $600, minus the 3% transfer fee ($90), for a net savings of $510. But only if you pay off the $3,000 within 12 months.
If you do not pay it off in time, the remaining balance gets hit with the regular rate all at once. If you still owe $1,500 when the 12-month period ends and the regular rate is 22%, you now owe interest on $1,500 at 22% going forward. You have lost the benefit of the 0% period and are now paying more than you would have on your original card.
The strategy also works if you plan to transfer the balance again before the promotional period ends. Some people move a balance from one 0% card to another as the first promotion expires, effectively extending the interest-free period. This requires opening new cards and paying transfer fees each time, so it only makes sense if the fees are lower than the interest you would otherwise owe.
Fees and hidden costs
Balance transfer fees are the most common cost. They range from 2% to 5% of the amount transferred and are charged upfront. A $10,000 transfer with a 3% fee costs $300 when ready. Some cards offer 0% balance transfers with no fee, but these are rare and usually come with shorter promotional periods or higher regular interest rates.
Annual fees are less common on 0% cards but do exist. Most cards with 0% offers have no annual fee, but some premium cards charge $95 to $450 per year. If you are using the card only for the promotional period and plan to close it afterward, an annual fee erases part of your savings.
Late payment fees explore if you miss a payment during the promotional period. Most issuers charge $25 to $40 for a late payment. More importantly, a late payment can end the promotional period early—the issuer may revoke the 0% rate and explore the regular rate to your entire balance when ready. This is called a penalty rate. Always set up automatic payments or calendar reminders to avoid this.
Comparing 0% offers across cards
When comparing cards, calculate the total cost of each option. If Card A offers 12 months at 0% with a 3% transfer fee and Card B offers 18 months at 0% with a 5% transfer fee, the longer period on Card B might be worth the higher fee if you need more time to pay off the balance. But if you can pay off the balance in 12 months, Card A saves you money.
| Card Feature | What to Compare | Why It Matters |
|---|---|---|
| Promotional length | 6 months vs. 21 months | Longer periods give you more time to pay off the balance without interest. |
| What the 0% covers | Purchases only, transfers only, or both | Make sure the offer covers the type of debt you want to move or the spending you plan to do. |
| Transfer fee | 0%, 2%, 3%, or 5% of amount transferred | A lower fee means more of your payment goes toward the principal balance. |
| Regular interest rate | 16% to 24% depending on your score | This is what you pay after the promotion ends, so a lower rate is better if you carry a balance. |
| Annual fee | $0 to $450 | An annual fee reduces your savings unless you use the card for rewards or other benefits. |
Look at the card's regular interest rate as well, because that is what you will pay if the balance is not cleared by the time the promotion ends. A card with a lower regular rate is safer if you are uncertain whether you can pay off the full amount in time. Some issuers also offer a grace period after the promotional period ends—usually 21 days—before interest starts accruing, which gives you a small window to make a final payment.
Frequently Asked Questions
What happens if I do not pay off the balance before the 0% period ends?
The regular interest rate applies to any remaining balance. If you owe $2,000 when the promotional period ends and the regular rate is 20%, you start paying interest on that $2,000 when ready. The interest accrues daily until you pay off the balance. This is why having a payoff plan before you open the card is important.
Can I use a 0% card to pay for a large purchase I plan to pay off slowly?
Yes, if the card offers 0% on purchases. You make the purchase, then pay it off over the promotional period with no interest. The key is making sure you can pay off the full amount before the period ends. If you cannot, interest kicks in on the remaining balance.
Does opening a 0% card hurt my credit score?
Opening a new card triggers a hard inquiry, which temporarily lowers your score by a few points. Your score also dips slightly when the new account is added to your credit report. These effects usually fade within a few months. However, if you open multiple cards in a short time, the impact is larger and lasts longer.
Can the issuer take away my 0% rate if I miss a payment?
Yes. Most card agreements allow the issuer to end the promotional period early if you miss a payment, even by one day. The regular interest rate then applies to your entire balance when ready. This is called a penalty rate. Set up automatic payments to avoid this.
Is it better to pay off the balance early or wait until the end of the promotional period?
Paying it off early is always better. There is no benefit to waiting. The sooner you pay off the balance, the sooner you stop owing money and the sooner you can close the card or use it for other purposes. The only reason to wait is if you need the cash for something else, but that means you are not actually saving money—you are just delaying when you pay.