What a balance transfer actually does

A balance transfer moves debt from one credit card to another, usually to a card offering a lower interest rate for a set period. The new card's issuer pays off your old balance, and you then owe that amount to the new card instead. The goal is to reduce how much interest you pay while you work down the debt.

The process itself is straightforward: you open a new card, request the transfer during or shortly after opening it, and the issuer handles the payment to your old card. You do not send money yourself. What matters is understanding the costs involved — balance transfer fees, the length of the promotional rate period, and what happens when that period ends.

Key Takeaways

  • Balance transfer fees typically run 3% to 5% of the amount you move, charged upfront and added to your new balance.
  • Promotional rates (often 0% APR) last anywhere from 6 to 21 months depending on the card; after that, a standard rate kicks in.
  • You must request the transfer within days of opening the card — most issuers allow 60 days, but waiting longer costs you promotional time.
  • The math only works if the fee plus interest during the promotional period costs less than interest on your old card would have cost.
  • During the transfer period, new purchases on the new card usually accrue interest immediately at the regular rate, not the promotional rate.

When a balance transfer makes financial sense

A balance transfer saves money only if the total cost — the transfer fee plus any interest after the promotional period ends — is less than what you would pay staying put. Run the numbers before you apply.

Start with your current card's interest rate and your balance. If you carry $5,000 at 22% APR and make $200 monthly payments, you will pay roughly $2,700 in interest over two years. Now compare that to a card with a 3% transfer fee ($150) and a 0% promotional rate for 18 months. If you pay $278 per month during those 18 months, you clear the balance before the promotional rate ends and pay only the $150 fee. The transfer saves you $2,550.

But if you cannot pay it off before the promotional period ends, the math changes. If that same $5,000 still has $1,500 remaining when the 0% period ends and the new card's regular APR is 20%, you will pay interest on the remaining balance. Calculate what that interest will be and add it to the $150 fee. If the total is still less than $2,700, the transfer still wins — but the margin is smaller.

A transfer does not make sense if you plan to keep carrying a balance indefinitely, because you will eventually pay interest at the new card's regular rate, which may not be much better than your current rate. It also does not make sense if you cannot commit to not using the new card for new purchases, because those purchases accrue interest immediately.

How to request the transfer and what information you need

Most issuers let you request a balance transfer when you apply for the card, or within 60 days after opening it. Some allow requests online through your account; others require a phone call. Check the card's terms or call the issuer's customer service line to confirm their process.

When you request the transfer, have this information ready: the name of your old card's issuer, your account number on that card, and the exact amount you want to transfer. You can transfer part of your balance if you want — you do not have to move everything. The issuer will contact your old card's company directly; you do not need to do anything with that card yourself.

The transfer typically posts to your new card within 7 to 14 days, though some issuers are faster. During this time, keep making your regular payment on the old card to avoid late fees. Once the transfer completes, your old card's balance will drop by the amount transferred, and your new card's balance will reflect the transferred amount plus the transfer fee.

Understanding transfer fees and promotional rates

Balance transfer fees are a percentage of the amount you move, charged upfront. Most cards charge 3% to 5%, though some offer 0% for a limited time (usually the first 60 days after opening). A $5,000 transfer at 4% costs $200, added to your new balance immediately.

The promotional rate period — typically 0% APR — lasts from 6 to 21 months depending on the card. This is the window when you pay no interest on the transferred balance. After the promotional period ends, the card's regular APR applies to any remaining balance. That regular rate can range from 15% to 25% or higher, depending on your creditworthiness and the card's terms.

Read the card's disclosure carefully to confirm three things: the exact length of the promotional period, whether new purchases are included in the 0% rate (they usually are not), and what the regular APR will be after the promotion ends. The issuer is required to provide this in writing before you open the card.

What happens to your old card after the transfer

Your old card remains open after the balance transfers, with a $0 balance. You can close it if you want, but closing it can hurt your credit score slightly because it reduces your total available credit and may shorten your average account age. Many people leave old cards open and unused to preserve their credit profile.

If you do close the old card, do it after the balance transfer has fully posted and you have confirmed the new card is working. Do not close it immediately after requesting the transfer, because the old issuer may still be processing the payment.

Do not use the old card for new purchases while the transfer is pending. Once the transfer completes and you have confirmed the balance is gone, you can decide whether to keep the card open or close it. If you keep it open, do not carry a balance on it — that defeats the purpose of the transfer.

How balance transfers affect your credit score

Opening a new card triggers a hard inquiry into your credit, which can lower your score by a few points temporarily. The new account also lowers your average account age, which may lower your score slightly. These effects are usually small and fade within a few months.

The transfer itself can actually help your score in the longer term. Moving a large balance off one card and onto another reduces your credit utilization on the old card (the percentage of available credit you are using). Lower utilization on multiple cards is better for your score than high utilization on one card.

However, if you then use the old card again and run up a new balance, you lose this benefit. The new card's balance also counts toward your total utilization, so if you transfer $5,000 and then charge $3,000 in new purchases on the new card, your total utilization may not improve much.

Common mistakes to avoid during a balance transfer

The biggest mistake is not paying off the transferred balance before the promotional rate ends. Mark the end date on your calendar and calculate how much you need to pay monthly to clear it. If you cannot hit that target, the transfer may not be worth doing.

Another common error is using the new card for new purchases. Those purchases accrue interest at the regular rate immediately, not the promotional rate. If you transfer a balance to a 0% card and then charge $2,000 in new purchases, you will pay interest on that $2,000 from day one. Use a different card for new purchases, or pay cash.

Do not apply for multiple balance transfer cards at once. Each application triggers a hard inquiry and lowers your score. Space applications out by at least a few months if you need to do more than one transfer.

Finally, do not assume the promotional rate applies to your entire new card. Read the terms carefully. Some cards offer 0% on transfers but a regular rate on purchases, or vice versa. Know exactly what rate applies to what.

Frequently Asked Questions

Can I transfer a balance from one card to the same issuer's other card?

Most issuers do not allow transfers between their own cards. You typically must transfer to a card from a different issuer. Check the specific card's terms or call the issuer to confirm their policy.

What if my balance transfer is denied?

The issuer may deny the transfer if your new card's credit limit is too low, if there is a problem with your old card's account, or if the issuer suspects fraud. Call the new card's issuer to ask why the transfer was denied and what you can do next. You may be able to request a lower transfer amount or contact your old card's issuer to resolve any issues.

Do I have to transfer my entire balance?

No. You can transfer part of your balance and leave the rest on your old card. This can be useful if your old card has a lower rate on part of the balance, or if you want to keep some debt on the old card while testing the new card's terms.

What happens if I miss a payment on the new card during the promotional period?

Missing a payment can end the promotional rate immediately, and the issuer may charge a late fee. The regular APR will then apply to your entire balance. Make payments on time to keep the 0% rate active for the full promotional period.

Can I do another balance transfer after the first one is paid off?

Yes, but opening multiple new cards in a short time will lower your credit score. Wait at least six months between balance transfer applications, and only do another transfer if the math shows it will save you money.