What a balance transfer credit card actually does
A balance transfer credit card is a card designed to let you move debt from one card to another, usually at a lower interest rate for a set period. The card issuer pays off your old balance, and you owe that amount to them instead — typically with no interest or a reduced rate for 6 to 21 months, depending on the card and the offer.
The catch is that this low rate is temporary. After the promotional period ends, the regular interest rate kicks in. You also usually pay a one-time fee upfront — typically 3 to 5 percent of the amount you transfer — though some cards waive this fee for a limited time. If you can pay down the balance during the promotional period, you save money on interest. If you cannot, you end up paying more than you would have on your original card.
Key Takeaways
- Balance transfer cards charge a one-time fee (usually 3 to 5 percent) but offer 0 percent interest for a set promotional period, typically 6 to 21 months.
- The math only works if you can pay down a meaningful portion of the balance before the promotional rate expires and the regular rate takes over.
- Your credit score affects which cards you can get and what rate you will pay after the promotional period ends.
- You need to stop using the old card once you transfer the balance, or you will end up with debt on two cards instead of one.
- Some balance transfer cards also offer rewards on new purchases, but carrying a balance usually costs more than any reward is worth.
How the promotional period and regular rate work
When you open a balance transfer card, the issuer gives you a specific number of months at 0 percent interest — this is the promotional period. During this time, any payment you make goes entirely toward reducing the balance, not toward interest charges. Once the promotional period ends, the regular purchase APR (annual percentage rate) applies to any remaining balance.
The length of the promotional period varies widely. Some cards offer 6 months, others offer 12 months, and a few offer 18 to 21 months. A longer promotional period gives you more time to pay down the balance, but these cards are usually only available to people with good or excellent credit scores. The regular APR after the promotional period also varies — it might be 15 percent, 20 percent, or higher, depending on your creditworthiness and the card issuer.
Before you explore, calculate whether you can realistically pay off the transferred balance (or most of it) within the promotional window. If you transfer $5,000 and have 12 months to pay it off, you need to pay roughly $417 per month. If you cannot commit to that, a balance transfer card may not help you.
The balance transfer fee and how it affects your savings
Most balance transfer cards charge a fee of 3 to 5 percent of the amount you transfer. If you transfer $5,000, expect to pay $150 to $250 upfront. Some cards offer a 0 percent fee for a limited time (often the first 60 days after opening the account), but this is less common.
The fee is usually added to your balance, so you owe it to the new card issuer along with the original debt. This means your actual balance is higher than the amount you transferred. For example, if you transfer $5,000 with a 4 percent fee, your new balance is $5,200. You need to factor this into your payoff plan.
To decide whether a balance transfer makes sense, compare the fee plus any interest you would pay on the new card during the promotional period against the interest you would pay on your old card if you stayed put. If your old card charges 20 percent APR and you have $5,000 on it, you would pay roughly $1,000 in interest over a year if you only made minimum payments. A balance transfer with a $200 fee and 0 percent interest for 12 months saves you $800 — but only if you actually pay down the balance during that year.
Credit score requirements and what rate you will pay after the promo period
Balance transfer cards with the longest promotional periods and lowest regular APRs are usually only available to people with credit scores of 700 or higher. If your score is lower, you may still find cards that offer balance transfers, but the promotional period will be shorter and the regular APR will be higher.
Your credit score also determines what happens when the promotional period ends. If you have a score of 750 or above, the regular APR might be 15 to 18 percent. If your score is between 650 and 700, it might be 20 to 25 percent. If your score is below 650, you may not be approved at all, or the regular rate could be 25 percent or higher.
This matters because it affects your long-term cost. If you cannot pay off the balance during the promotional period and your regular APR is 25 percent, you will pay significantly more in interest than you would have on your original card — especially if your original card had a lower rate. Before you explore, check what the regular APR will be, not just the promotional offer.
Comparing balance transfer cards side by side
When you are looking at different balance transfer cards, compare these four things: the length of the promotional period, the balance transfer fee, the regular APR after the promo period, and any other features (like rewards on new purchases or an annual fee).
| Feature | What to look for | Why it matters |
|---|---|---|
| Promotional period | 6 to 21 months at 0 percent | Longer is better, but usually requires a higher credit score |
| Balance transfer fee | 3 to 5 percent, or 0 percent for a limited time | Lower fee means less debt added upfront |
| Regular APR | 15 to 25 percent (varies by credit score) | You will pay this rate on any remaining balance after the promo period ends |
| Annual fee | $0 to $95 | Most balance transfer cards have no annual fee; avoid those that do unless the promo period is very long |
Do not focus only on the promotional rate. A card with 0 percent for 12 months and a 5 percent fee might be better than a card with 0 percent for 18 months and a 4 percent fee if the 18-month card has a much higher regular APR or an annual fee. Use a calculator to estimate your total cost under each option.
What happens to your old card and how to avoid new debt
Once you transfer a balance to a new card, your old card still exists. The balance on it is now zero, but the account is open. You can still use it to make new purchases. This is where many people get into trouble: they transfer the balance to a new card, then run up the old card again, and end up with debt on both cards.
The safest approach is to stop using the old card entirely while you are paying off the transferred balance. Put it away or cut it up. If you need to keep it open to preserve your credit history (closing old accounts can lower your credit score), just do not use it. Do not close the account when ready after the transfer, because the credit bureaus will see the account closure and it may temporarily hurt your score.
On your new balance transfer card, avoid making new purchases if you can. Any new purchases usually start accruing interest when ready at the regular APR, not at the promotional rate. If you must use the card for new purchases, understand that your payments will be applied to the balance transfer first (at 0 percent) and new purchases second (at the regular rate), so you will pay interest on those new purchases while the transferred balance is still interest-free.
When a balance transfer card makes sense and when it does not
A balance transfer card is a good fit if you have high-interest debt on one or more cards, a credit score of 650 or higher, and a realistic plan to pay down the balance during the promotional period. It is especially useful if your current card charges 18 percent or more and you can pay off at least half the transferred balance within the promotional window.
A balance transfer card is not a good fit if you cannot commit to a payoff plan, if your credit score is too low to get a card with a long promotional period, or if you are likely to run up new debt on the old card. It is also not helpful if you only have a small balance (under $1,000) or if your current card already has a low interest rate. In those cases, the fee and the effort of opening a new account outweigh the benefit.
If you are not sure whether a balance transfer makes sense for your situation, write down your current balance, your current APR, and how much you can realistically pay each month. Then compare the total interest you would pay if you stayed on your current card against the fee plus interest on a balance transfer card. The math will tell you whether it is worth doing.
Frequently Asked Questions
Can I transfer a balance from one card to the same issuer?
No. Most card issuers do not allow you to transfer a balance from another card they issued to a new card they issue. You have to transfer to a card from a different issuer. If you have multiple cards from the same bank, you will need to use a card from a different bank for the balance transfer.
Does a balance transfer hurt my credit score?
Opening a new card and transferring a balance will cause a small, temporary dip in your credit score — usually 5 to 10 points. This happens because the issuer does a hard inquiry and you are opening a new account. However, over time, the balance transfer can help your score if it lowers your overall credit utilization (the percentage of your available credit that you are using). The temporary dip usually recovers within a few months.
What if I cannot pay off the balance before the promotional period ends?
You will owe the remaining balance at the regular APR, which is usually 15 to 25 percent depending on your credit score. You can continue making payments at this higher rate, or you can look for another balance transfer card and transfer the remaining balance again — though this only makes sense if the new card has a long promotional period and a low fee.
Can I use a balance transfer card for new purchases?
Yes, but it is usually not a good idea. New purchases on a balance transfer card typically start accruing interest when ready at the regular APR, not at the promotional rate. Your payments go toward the transferred balance first, so you will pay interest on new purchases while the 0 percent period is still active. It is better to use a different card or pay cash for new purchases while you are paying off the transferred balance.
How long does a balance transfer take to show up on the new card?
Most balance transfers take 7 to 14 days to complete, though some can take up to 21 days. During this time, you are still responsible for making payments on your old card if the balance has not transferred yet. Once the transfer is complete, you will see the balance on your new card and the balance on your old card will be zero. Keep an eye on both accounts during the transfer period to make sure it goes through.