How balance transfer fees work
A balance transfer fee is a one-time charge, usually a percentage of the amount you move to the new card. It is added to the transferred balance, so you start the 0% period owing a little more than you moved. A transfer is worth it when the interest you avoid during the promo period is larger than the fee, and the sooner the interest saved passes the fee, the sooner you break even.
This guide explains how the fee is charged, why it also affects interest after the promo ends, and how to tell whether it pays for itself.
How the fee is charged
The card issuer sets the fee in the card’s terms, usually as a percentage of each amount transferred. Some cards also set a minimum fee in dollars. The fee is charged when the transfer posts and is added to your new card’s balance.
That means you do not pay the fee separately in cash. Instead, it becomes part of the balance you pay off during the promo period, and it is subject to the card’s regular APR if any of the balance is still unpaid when the promo ends.
The simple math
The fee is the transferred amount times the fee percentage. On a hypothetical $6,000 transfer with a 3% fee, the fee is $180.00, so your new balance starts at $6,180.00. At 5%, the fee is $300.00 and the balance starts at $6,300.00.
Our calculator rounds the fee to the cent, adds it to the transferred balance, and then applies your monthly payment. It compares that with staying on your current card, where interest is charged each month at your current APR.
Breakeven: when the fee pays for itself
On day one, a transfer puts you behind by the amount of the fee. Each month that you avoid interest you would otherwise have paid on your old card, you earn some of that back. The breakeven month is the first month when the interest you have avoided is at least as large as the fee plus any interest charged on the new card.
A high APR on your current card means you avoid a lot of interest each month, so you break even quickly. A low current APR means it takes longer, and in some cases the fee is never earned back.
The fee also affects interest after the promo
Because the fee is added to the balance, a higher fee also means a higher balance if anything is left when the 0% period ends. That leftover balance is then charged the post-promo APR. So a larger fee costs you twice: once up front, and again in extra interest if you do not finish paying during the promo. Our guide on what happens when the 0% APR period ends covers this in more detail.
Worked example: the same transfer at three fee levels
For example, suppose you move a hypothetical $6,000 balance from a card charging 21% APR to a card with a 12-month 0% period and a 23% APR afterwards, and you pay $300 a month either way. Staying on the current card would cost $1,449.66 in interest. Using the same math as our calculator:
| Fee | Fee amount | Interest on new card | Breakeven | Net savings |
|---|---|---|---|---|
| 0% (for comparison) | $0.00 | $230.67 | Month 1 | $1,218.99 |
| 3% | $180.00 | $266.97 | Month 2 | $1,002.69 |
| 5% | $300.00 | $292.06 | Month 3 | $857.60 |
At a 3% fee, the transfer would save $1,002.69 after the fee and break even in Month 2. At 5%, net savings fall to $857.60. Notice that interest on the new card also rises with the fee, from $230.67 to $292.06, because a larger starting balance leaves more to be charged the post-promo APR. At $300 a month, the balance is not fully paid within the promo in any of these cases.
Comparing offers by fee
When you compare balance transfer cards, look at the fee together with the length of the 0% period and the APR afterwards. A slightly higher fee with a longer promo can cost less overall if you need the extra months to pay off the balance. A lower fee with a short promo may cost more if a balance is left over. The calculator lets you test each combination with your own payment.
Common questions
Is the balance transfer fee charged every month?
No. It is a one-time charge on each transfer, added to the balance when the transfer posts. Some cards charge a fee on later transfers too, so check the terms if you move more than once.
Can I avoid paying interest on the fee?
Yes, by paying off the full balance, including the fee, before the 0% period ends. Any of it left over is charged the post-promo APR.
The takeaway
A balance transfer fee is a one-time percentage of the amount you move, added to your new balance. It is worth paying when the interest you avoid is larger than the fee, which happens quickly when your current APR is high. A higher fee also adds to interest after the promo if a balance remains, so compare the fee, promo length, and post-promo APR together.
This guide is educational only and is not financial, tax, or legal advice. The example uses hypothetical numbers; your lender or card issuer sets your actual terms. See how our calculators work.
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