How Balance Transfer Cards Work: Fees, Intro Periods and a Worked Example
A balance transfer can cut the interest you pay on card debt, but only if the numbers work for you. Here's how to check.
In this guide
Key takeaways
- A balance transfer moves debt from one card to another, usually with a low or 0% intro rate for a set time.
- Most cards charge a transfer fee, often 3% to 5% of the amount you move.
- The plan only works if you can pay off most or all of the balance before the intro period ends.
- A late payment can end the intro rate early, so set up automatic payments.
What a balance transfer card does
A balance transfer card lets you move debt from one or more credit cards onto a new card. The new card usually offers a low or 0% introductory interest rate on the amount you move, for a set number of months.
During that time, more of each payment goes toward the debt itself instead of interest. That can help you pay the balance down faster. But the low rate is temporary, and there are fees and rules to understand before you apply.
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The three numbers that matter
Every balance transfer offer comes down to three numbers. You'll find them in the card's terms, often in a table called the pricing or rates and fees summary.
- The intro rate and how long it lasts. Intro periods commonly run from about 12 to 21 months. Longer is not always better if the fee is higher.
- The balance transfer fee. This is usually 3% to 5% of the amount you transfer, added to your new balance on day one.
- The rate after the intro period. Any balance left when the intro period ends starts building interest at the card's regular rate.
Compare offers on all three numbers together. A card with a slightly shorter intro period and a lower fee can cost less overall, as long as you can clear the balance in time.
A worked example
Here's a simple example to show how the math works. The figures are rounded and for illustration only.
The situation: you owe $6,000 on a card charging 24% APR, and you can pay $350 a month.
| Stay on current card | Balance transfer | |
|---|---|---|
| Upfront fee | $0 | $180 (3%) |
| Interest rate | 24% APR | 0% for 18 months |
| Time to pay off | About 22 months | About 18 months |
| Total interest and fees | About $1,420 | $180 |
In this example, the transfer reduces the cost by around $1,240 and clears the debt about four months sooner. If the payment were only $200 a month, there would still be a balance when the intro period ended, and that remainder would start building interest.
To run your own numbers, divide your balance plus the transfer fee by the number of intro months. That's the monthly payment you need to clear the debt before the rate goes up.
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Not now, show me another guide →Rules that catch people out
The fine print matters as much as the headline rate. These are the rules people most often miss:
- A deadline to transfer. The intro rate often applies only to balances moved within a set time after opening the account, such as the first 60 or 120 days.
- No transfers within the same bank. Most issuers won't let you move a balance between two of their own cards.
- Your credit limit may be lower than your debt. You can only transfer up to the limit you're given, including the fee.
- New purchases may not get 0%. Some cards charge the regular rate on purchases. Using the card for spending can make the debt harder to clear.
- Late payments. Missing a payment can end the intro rate early and may add a late fee.
How it can affect your credit
Applying for a new card usually leads to a hard inquiry, which can lower your credit score slightly for a while. A new account also lowers the average age of your accounts.
Over time, paying the balance down can help. Lower balances compared with your total credit limits generally count in your favor, and a record of on-time payments matters most of all. Keeping your old card open with a zero balance can also help your overall credit use, as long as it doesn't have an annual fee you'd rather not pay.
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When a balance transfer may not make sense
- The balance is small. If you could pay it off in two or three months, the fee may cost more than the interest you'd save.
- You can't pay it off in time. If your budget only covers part of the balance during the intro period, compare the total cost with other options, such as a fixed-rate personal loan.
- You're likely to keep spending on the old card. Moving debt without changing spending habits can leave you with balances on two cards.
If debt feels unmanageable, a nonprofit credit counselor can help you look at your full picture and your options.
How to do a balance transfer, step by step
- Write down each balance, its interest rate and your current minimum payments.
- Work out the monthly payment you can afford and how many months you'd need.
- Compare offers on the intro period, the transfer fee and the rate afterward.
- Apply, then request the transfer using the account numbers of the cards you're paying off.
- Keep paying your old card until the transfer shows as complete, which can take a week or two.
- Set up automatic payments for at least the amount you planned, and note the date the intro rate ends.
Common questions
Can I transfer a balance between two cards from the same bank?
Usually not. Most issuers only allow transfers from cards held with other banks. Check the card's terms before you apply.
What happens when the intro period ends?
Any balance still on the card starts building interest at the card's regular rate. The fee you paid at the start is not refunded.
Should I close my old card after the transfer?
Not necessarily. Keeping it open with a zero balance can help your credit use, but consider any annual fee and whether you'll be tempted to use it.
Sources and further reading
This guide is general information, not financial advice. Rates, fees and terms vary by provider and can change. Always check the provider's own terms, and consider speaking to a qualified financial professional about your situation.
