What a zero interest balance transfer card actually does
A zero interest balance transfer card lets you move debt from one credit card to another and pay no interest on that transferred amount for a set period — usually 6 to 21 months, depending on the card and the offer at the time you open it. The card issuer pays off your old balance, and you owe that same amount to the new card instead, but without interest charges during the promotional window.
The catch is that this 0% rate applies only to the balance you transfer. Any new purchases you make on the card typically start accruing interest right away at the card's regular rate, which can be 15% to 25% or higher. Once the promotional period ends, any remaining transferred balance also begins to accrue interest at the regular rate.
Balance transfer cards work best if you have a specific amount of existing debt you want to pay down without interest eating into your payments, and you can commit to paying it off before the promotional period ends. They are not a way to borrow money cheaply — they are a way to pause interest on debt you already have.
Key Takeaways
- The 0% interest period covers only the balance you transfer, not new purchases or cash advances.
- Most cards charge a balance transfer fee of 3% to 5% of the amount you move, added to what you owe.
- You need to know your promotional period length and calculate whether you can pay off the full transferred balance before interest kicks in.
- Your credit score will dip slightly when you open the card and when the issuer checks your credit, but it usually recovers within a few months.
- If you cannot pay off the balance before the promotional period ends, the regular interest rate applies to whatever remains.
How to find and compare balance transfer offers
Balance transfer offers change constantly, and the rate and length you see advertised may not be the rate you receive — it depends on your credit score, income, and the issuer's current appetite for new cardholders. You can see what offers are currently available by visiting major card issuer websites directly (Chase, American Express, Citi, Bank of America, Capital One, Discover) or by using a card comparison site that shows current promotions.
When you compare cards, look at three numbers: the length of the 0% period, the balance transfer fee, and the regular APR that kicks in after the promotional period ends. A card with a 21-month 0% offer and a 3% fee is usually better than one with 12 months and a 5% fee, because you have more time to pay down the balance and the fee is smaller. Write down the regular APR too — if you cannot pay off the balance in time, you will want the lowest possible rate for what remains.
Some cards offer 0% for 6 months; others go as long as 21 months. The longer the window, the more time you have to pay without interest, but cards with longer promotional periods often have higher regular APRs or higher annual fees. There is no single "best" card — it depends on how much you owe and how quickly you can pay it down.
The balance transfer fee and how it affects your payoff plan
Nearly every balance transfer card charges a fee upfront, usually 3% to 5% of the amount you transfer. If you move $5,000, expect to pay $150 to $250 in fees. This fee is added to your balance on the new card, so you owe more than you started with.
You need to factor this fee into your payoff calculation. If you transfer $5,000 with a 4% fee, you now owe $5,200. If your promotional period is 12 months, you need to pay at least $433 per month to clear the balance before interest begins. If you can only pay $400 per month, you will still owe money when the 0% period ends, and interest will start accruing on the remainder.
Some cards occasionally offer 0% balance transfers with no fee, but these are rare and usually come with shorter promotional periods or higher regular APRs. It is worth checking, but assume you will pay a fee and budget accordingly.
Steps to move a balance from your old card to the new one
Once your new card arrives, you do not transfer the balance yourself. Instead, you contact the new card issuer and tell them you want to do a balance transfer. You will need your old card number, the balance you want to transfer, and the old card issuer's name.
The new issuer will contact your old card company and arrange the transfer. This usually takes 5 to 14 business days. During this time, keep making minimum payments on your old card — the transfer is not when ready, and you do not want to miss a payment and damage your credit score. Once the transfer completes, your old card balance will drop to zero (or close to it), and the amount will appear on your new card.
Some issuers let you request the balance transfer when you open the card, either online or by phone. Others require you to wait for the physical card to arrive. Check your welcome materials or call the customer service number on the back of your new card to find out how to start the transfer.
What happens when the promotional period ends
Mark the end date of your 0% period on a calendar or set a phone reminder. On that date, any balance remaining on the card will begin to accrue interest at the regular APR. If you owe $2,000 when the period ends and the regular rate is 18%, you will start paying roughly $30 per month in interest alone.
If you cannot pay off the entire balance before the promotional period ends, you have a few options. You can try to transfer the remaining balance to another 0% card, though this requires opening a new account and paying another transfer fee. You can keep the card and pay interest on the remaining balance at the regular rate. Or you can look into a personal loan or other debt consolidation method, though these come with their own costs and terms.
The best approach is to do the math before you open the card. Divide the transferred amount (plus the fee) by the number of months in the promotional period. If that monthly payment fits your budget, proceed. If it does not, the card may not be the right tool for your situation.
How a balance transfer affects your credit score
Opening a new credit card will cause a small, temporary dip in your credit score — usually 5 to 10 points. This happens because the issuer runs a hard inquiry on your credit report, and because a new account lowers the average age of your accounts. This dip typically recovers within 3 to 6 months as you make on-time payments.
Moving a balance to the new card can actually help your credit score in one way: it lowers your credit utilization ratio on your old card. If you had $5,000 of a $10,000 limit in use, your utilization was 50%. After the transfer, it drops to 0% (or close to it), and lower utilization is good for your score. This benefit can offset the initial dip from opening the new account.
The key is to make all payments on time. A single late payment will hurt your score far more than opening the card helped it. Set up automatic payments for at least the minimum amount due, and aim to pay more if you can.
When a balance transfer card does not make sense
A balance transfer card is not the right choice if you cannot commit to paying down the balance before the promotional period ends. If you transfer $5,000 but can only afford $200 per month in payments, you will still owe $2,600 when the 0% period ends. At that point, you are paying interest on a balance you moved specifically to avoid interest, which defeats the purpose.
Balance transfer cards also do not help if your debt problem is that you keep spending more than you earn. Moving debt to a new card with a 0% rate does not change your spending habits. If you open a balance transfer card and then run up the old card again, you now have two cards with balances and two interest rates to manage.
If you have very bad credit, you may not be approved for a balance transfer card at all, or you may only be approved for cards with short promotional periods and high regular APRs. In that case, a personal loan or credit counseling may be a better path forward.
Frequently Asked Questions
Can I transfer a balance from one card to another card from the same bank?
Most banks do not allow you to transfer a balance between their own cards. You can usually transfer from a card issued by a different bank, but not from another card you hold with the same issuer. Check the card's terms or call customer service to confirm before you explore.
What if I miss a payment during the promotional period?
A missed payment can end your 0% promotional rate when ready, even if you are only a few days late. The issuer will also charge a late fee and report the missed payment to the credit bureaus, which will damage your score. Set up automatic payments to avoid this risk.
Can I use a balance transfer card to pay off a personal loan or medical debt?
Balance transfer cards work only with credit card debt. You cannot use one to pay off a personal loan, medical bill, or other non-credit-card debt. If you want to consolidate those debts, a personal loan or debt consolidation loan is a better option.
Do I have to close my old card after I transfer the balance?
You do not have to close it, and closing it can hurt your credit score by lowering your available credit and raising your overall utilization ratio. It is usually better to leave the old card open with a zero balance, though you can stop using it if you want.
What is the difference between a balance transfer and a cash advance?
A balance transfer moves debt from one credit card to another and qualifies for the 0% promotional rate. A cash advance is when you withdraw cash from your credit card, and it never qualifies for a promotional rate — it starts accruing interest when ready at a higher rate than regular purchases, usually 20% to 30%.