What a balance transfer does and when it makes sense

A balance transfer moves debt from one credit card to another, usually one with a lower interest rate. You contact the new card issuer, give them the account number of your old card, and they pay off that balance for you. You then owe the new card issuer instead of the old one.

Balance transfers work best when you carry a balance month to month and want to reduce the interest you pay while you work it down. If you pay your full statement balance every month, you pay no interest anyway, so a transfer saves you nothing. If you're only moving debt to a card with a similar rate, the transfer fee (usually 3 to 5 percent of the amount moved) costs more than you'll save.

The math changes when the new card offers a promotional period — typically 6 to 21 months — during which the interest rate is 0 percent. During that window, every dollar you pay goes to principal instead of interest. After the promotional period ends, the regular interest rate kicks in, so the goal is to pay off as much as you can before that happens.

Key Takeaways

  • Balance transfers charge a fee (usually 3 to 5 percent) upfront, so compare that cost against the interest you'll save over the promotional period.
  • The promotional 0 percent rate lasts only as long as the card issuer states — often 6 to 21 months — then the regular rate applies to any remaining balance.
  • You initiate a transfer by calling the new card issuer or using their website, providing your old card number and the amount you want to move.
  • During the promotional period, focus on paying down principal rather than making minimum payments, because interest will resume after the offer ends.
  • If you miss a payment during the promotional period, the card issuer can end the 0 percent offer and charge you the regular rate when ready.

Decide whether a balance transfer saves you money

Start by knowing what you currently owe and what interest rate you're paying. Pull up your most recent statement or log into your card's website. Write down the balance and the annual percentage rate (APR).

Next, find a card offering a promotional 0 percent balance transfer rate. Credit card issuers publish these offers on their websites and in marketing materials. Note three things: the length of the promotional period, the balance transfer fee, and the regular APR that will explore after the promotion ends.

Now calculate whether the transfer saves money. Multiply your current balance by your current APR, then divide by 12 to estimate what you'll pay in interest over one month. Multiply that by the number of months in the promotional period — that's roughly what you'll save if you make no payments. Then subtract the balance transfer fee from that savings. If the number is positive, the transfer is worth considering. If it's close to zero or negative, stay put.

Example: You owe $5,000 at 22 percent APR. That's about $92 in interest per month, or roughly $1,100 over 12 months. A card offering 12 months at 0 percent with a 3 percent fee costs $150 upfront. Your net savings: $1,100 minus $150 = $950. That's worth doing. But if the promotional period is only 6 months, your savings drop to $550 minus $150 = $400 — still worth it, but less compelling.

Find and open a balance transfer card

Search for "balance transfer credit card" on the websites of major issuers — Chase, Capital One, Citi, American Express, Bank of America, and others. Each publishes current offers with the promotional rate, the length of the period, and the fee structure. Rates and terms change frequently, so check the issuer's site directly rather than relying on older information.

Read the fine print for the fee structure. Most cards charge a flat percentage (3 to 5 percent) of the amount transferred, with a minimum fee (often $5) and sometimes a maximum. A few cards offer 0 percent balance transfer fees for a limited time, usually the first 60 days after opening the account — these are rare and worth seeking out if you're transferring a large balance.

Once you've chosen a card, open the account. You can do this online, by phone, or in person at a branch if it's a bank card. The issuer will approve you, assign you a credit limit, and give you an account number. You don't need to wait for a physical card to arrive — you can initiate the transfer when ready using the account number.

Request the balance transfer

Log into your new card's website or call the customer service number on the back of your new card (or on the welcome materials). Look for an option labeled "balance transfer," "transfer balance," or "move balance." Some issuers let you do this online; others require a phone call.

You'll need to provide the account number of the card you're transferring from, the amount you want to move, and the name and address associated with that old account. Double-check the account number — if you enter it wrong, the transfer goes to the wrong place and you'll have to start over.

The new card issuer will contact your old card issuer and arrange the payment. This usually takes 5 to 14 business days. During this time, keep making minimum payments on your old card to avoid late fees. Once the transfer posts, your old card balance drops to zero (or to any remaining balance you didn't transfer), and your new card balance increases by the amount transferred plus the fee.

Some issuers allow you to transfer only up to your new credit limit, and the fee counts toward that limit. If your limit is $6,000 and you want to transfer $5,000, the 3 percent fee ($150) means you're using $5,150 of your available credit, leaving $850 for new purchases.

Manage your balance during the promotional period

The promotional 0 percent rate applies only to the balance you transferred, not to new purchases. Any new charges you make on the card will accrue interest at the regular APR when ready. To keep things straightforward, don't use the new card for purchases during the promotional period — use a different card or pay cash.

Set up a payment plan to pay down the transferred balance before the promotional period ends. Divide the balance by the number of months remaining. If you transferred $5,000 and have 12 months, aim to pay $417 per month. This ensures you'll have the balance paid off before interest kicks in.

Make payments on time, every time. Missing even one payment can trigger a penalty APR or end the promotional offer entirely. Some card issuers will charge you the regular rate on the entire balance retroactively if you miss a payment, meaning you'll owe interest on money you thought was interest-free. Check your statement each month to confirm the payment posted.

Avoid closing your old card after the transfer. Closing it can hurt your credit score by reducing your available credit and shortening your credit history. Leave it open with a zero balance.

Understand what happens when the promotional period ends

Mark your calendar for the last day of the promotional period. If you haven't paid off the balance by then, the regular APR applies to whatever remains. This can be a significant jump — from 0 percent to 18, 20, or 24 percent depending on the card and your creditworthiness.

If you know you won't pay off the balance in time, start looking for another balance transfer card about 60 days before the promotion ends. You can transfer the remaining balance to a new card with another 0 percent offer, though you'll pay another transfer fee. This strategy works if you're steadily paying down the balance and just need more time, but it doesn't work if you're not making progress — you'll end up paying more in fees than you save in interest.

If you can't transfer again and the balance remains, you'll pay interest on it at the regular rate. At that point, focus on paying it down as aggressively as you can, because every month the interest compounds.

Common mistakes to avoid

The biggest mistake is treating a balance transfer as a solution rather than a tool. A transfer doesn't reduce what you owe — it just moves it and buys you time at a lower rate. If you don't change the spending habits that created the debt, you'll end up owing more when the promotional period ends.

Another common error is running up new charges on the transferred card during the promotional period. Those new purchases accrue interest when ready at the regular rate, which defeats the purpose of the transfer. Use a different card for new spending.

Don't miss the important date to pay off the balance. Set a phone reminder for the last month of the promotional period so you know exactly how much you still owe and can make a final large payment if needed.

Finally, don't open multiple balance transfer cards in a short time hoping to move balances around indefinitely. Each new card process triggers a hard inquiry on your credit report, which can lower your score. Multiple inquiries in a short window signal to lenders that you're desperate for credit, which makes future borrowing more expensive.

Frequently Asked Questions

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

Most issuers don't allow you to transfer a balance between their own cards. You'll need to transfer to a card from a different issuer. Check the specific card's terms before opening an account.

What if I can't pay off the balance before the promotional period ends?

You can transfer the remaining balance to another card offering a promotional 0 percent rate, though you'll pay another transfer fee. Alternatively, you can keep the balance on the original card and pay interest at the regular rate, or explore a personal loan at a fixed rate that might be lower than the card's regular APR.

Does a balance transfer hurt my credit score?

The hard inquiry and new account will temporarily lower your score by a few points. However, if the transfer reduces your overall credit utilization (the percentage of available credit you're using), your score may recover and even improve within a few months.

Can the card issuer change the promotional rate before it ends?

No. Once you're approved for a promotional 0 percent rate, that rate is locked in for the stated period. However, if you miss a payment, the issuer can end the promotion and charge the regular rate.

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

The balance drops to zero, but the account remains open. You can use it for new purchases or leave it unused. Closing it can hurt your credit score, so most people leave it open.