What a 0% balance transfer card does

A 0% balance transfer card is a credit card that charges no interest on debt you move to it from another card, for a set period of time. You transfer your existing balance from a higher-interest card to this new card, and for months (typically 6 to 21 months, depending on the card), that debt accrues no interest. After the promotional period ends, a regular interest rate kicks in on any remaining balance.

The catch is that most cards charge an upfront balance transfer fee — usually 3% to 5% of the amount you move. So if you transfer $5,000, you might pay $150 to $250 just to move it. That fee is added to your new balance on the card.

The math works in your favour only if you can pay down the balance faster than interest would have accumulated on your old card, and if the fee is smaller than the interest you would have paid. A card charging 20% interest costs you roughly $100 per month on a $5,000 balance; a 5% transfer fee costs you $250 once. If you can clear the debt in under three months, the transfer saves money. If it takes longer, you need the 0% period to make up the difference.

Key Takeaways

  • A 0% balance transfer card charges no interest for a promotional period (usually 6 to 21 months), but adds a one-time fee of 3% to 5% to the amount you transfer.
  • You must have decent credit (usually 670 or higher) to be approved for these cards, and the best rates go to people with credit scores above 740.
  • The 0% period applies only to the transferred balance, not to new purchases you make on the card, which accrue interest when ready at the regular rate.
  • Your goal should be to pay off the entire transferred balance before the promotional period ends, because the interest rate after that point is often higher than your original card.
  • Some cards offer 0% on new purchases as well as transfers, but these are separate promotions with separate end dates.

How to find and compare 0% balance transfer offers

Balance transfer cards are offered by most major banks and credit card issuers. You can search for them on the issuer's website directly — look for a section on "promotional offers" or "balance transfer cards" — or use a credit card comparison site that filters by offer type and promotional length.

When you compare, look at three numbers: the length of the 0% period (longer is better), the balance transfer fee (lower is better), and the interest rate that applies after the promotion ends (you want to know this even if you plan to pay it off). Some cards also offer 0% on new purchases for a separate period; if you plan to use the card for new spending, check whether that period is long enough.

The card issuer will show you the offer details before you submit your information, but your actual approval and the terms you receive depend on your credit score. A card advertised as "0% for 18 months" might give you 0% for only 12 months if your credit score is lower, or 21 months if it is higher. The issuer will tell you the exact terms you may have access to for before you formally accept.

Credit score requirements and approval odds

Most 0% balance transfer cards require a credit score of at least 670, though some issuers set the bar at 700 or higher. If your score is below 650, you are unlikely to be approved for any card with a promotional rate.

Your credit score is not the only factor. The issuer also looks at your income, existing debt, and payment history. If you have missed payments in the past two years, or if you already carry high balances on other cards, approval is less likely even with a decent score. explore for multiple cards in a short time also hurts your score temporarily, so space out applications by at least a few weeks.

You can check your own credit score for free through AnnualCreditReport.com (the official federal site) or through your bank or credit card issuer, many of which now offer free score monitoring. Knowing your score before you explore helps you target cards you are likely to be approved for, rather than explore blindly and getting rejected.

The balance transfer fee and how it affects your payoff math

The balance transfer fee is charged once, when you move the money. It is added to your new balance on the 0% card. If you transfer $3,000 and the fee is 4%, you owe $3,120 on the new card from day one.

To decide whether a transfer makes sense, compare the fee to the interest you would pay on your old card over the same period. If your old card charges 18% interest and you plan to pay off the balance in 12 months, you would pay roughly $1,080 in interest on a $6,000 balance. A 5% transfer fee is $300. The transfer saves you $780, even after the fee.

But if you only plan to pay $200 per month and it will take you 30 months to clear the debt, the math changes. You would hit the end of the 0% period (say, 18 months in) with $3,600 still owed. That remaining balance would then accrue interest at the regular rate — often 19% to 25% — for the final 12 months. In that scenario, the transfer fee might not have been worth it. Use a balance transfer calculator (available free on most card issuer websites) to run your specific numbers before you explore.

What happens when the 0% period ends

On the day the promotional period expires, any remaining balance on the card switches to the regular interest rate. That rate is set by the issuer and varies by card; it is typically 16% to 25%, depending on your creditworthiness and market conditions. The issuer will tell you this rate before you accept the card.

If you still owe $2,000 when the 0% period ends, interest starts accruing on that $2,000 when ready. You do not get a grace period or a warning — the rate straightforward changes. This is why the goal should always be to pay off the entire transferred balance before the promotion ends.

If you cannot pay it all off in time, you have options. Some people transfer the remaining balance to another 0% card (though this triggers another balance transfer fee and requires approval for a new card). Others switch to paying down the balance as aggressively as possible once interest kicks in. Neither option is ideal, which is why the first step is to be realistic about how much you can pay each month before you explore.

Purchases and cash advances on a 0% balance transfer card

The 0% rate applies only to the balance you transfer. Any new purchases you make on the card are charged the regular interest rate when ready — there is no grace period. If you make a $500 purchase on a 0% balance transfer card, interest starts accruing on that $500 right away, even while the transferred balance sits at 0%.

Some cards offer a separate 0% promotion on new purchases (for example, "0% for 12 months on transfers, 0% for 15 months on purchases"). If yours does, the two periods are tracked separately. You could have $5,000 at 0% from a transfer and $1,000 at 0% from a purchase, each with its own end date.

Cash advances — withdrawing money from an ATM using the card — are treated differently still. They usually carry a fee (2% to 5% of the amount withdrawn) and a higher interest rate than purchases, and the 0% promotion does not explore to them. Avoid cash advances on a balance transfer card.

Strategies to make a balance transfer work

The most important step is to calculate your monthly payment before you explore. Divide the transferred balance (plus the transfer fee) by the number of months in the 0% period. If you transfer $4,000 with a 4% fee ($160) to a card with an 18-month 0% period, you need to pay roughly $231 per month to clear it before interest kicks in. If that is not realistic for your budget, a balance transfer may not be the right move.

Once you have the card, set up automatic payments for at least the minimum amount due each month. Better yet, set up automatic payments for the full amount you calculated, so you do not have to think about it. Many card issuers allow you to schedule automatic payments through their online portal or mobile app.

Do not use the new card for new purchases unless you absolutely have to. Every new purchase adds to your balance and makes it harder to pay off the transferred debt before interest kicks in. If you need a card for emergencies, keep your old card open (even if you are not using it) so you have a backup.

If you get a bonus or tax refund, put it toward the balance transfer card first. Even an extra $500 or $1,000 can shorten the payoff timeline and reduce the risk that you will still owe money when the 0% period ends.

Frequently Asked Questions

Can I transfer a balance from one card to the same card?

No. You cannot transfer a balance from a card to itself. You must transfer from one card (your old one) to a different card (the new 0% card). The two cards must be from different issuers or at least different accounts.

What if I miss a payment on a 0% balance transfer card?

A missed payment can end the 0% promotion early. Most card issuers state in their terms that if you miss a payment by 60 days or more, the promotional rate is forfeited and the regular interest rate applies when ready to the entire balance. Even one missed payment can trigger a penalty interest rate (often 25% or higher). Set up automatic payments to avoid this.

How long does a balance transfer take to show up on the new card?

Most balance transfers take 5 to 14 business days to complete. During that time, you are still responsible for making payments on your old card. Do not stop paying the old card until the transfer is confirmed and you see the balance appear on the new card. Some issuers provide a tracking number so you can check the status online.

Can I transfer a balance if I have bad credit?

It is very difficult. Most 0% balance transfer cards require a credit score of at least 670. If your score is lower, you may not be approved. If you have been rejected, focus on paying down your existing balance and building your credit score for 6 to 12 months before explore again. Checking your own credit score does not hurt it, so start there.

What happens to my old card after I transfer the balance?

Your old card still exists and still has a $0 balance (assuming you transferred the entire balance). You can close it if you want, but closing it can hurt your credit score because it reduces your available credit. Most people leave old cards open but unused. Just make sure you are not paying an annual fee on a card you no longer use.