Balance transfer cards are one of the most powerful tools available to someone with high-interest credit card debt — and one of the most misused. When used correctly, they're essentially an interest-free loan for 15-21 months. When used incorrectly, they extend your debt and cost you more.
How They Work
You apply for a new credit card with a 0% introductory APR on balance transfers, typically for 12-21 months. You transfer your existing credit card balance(s) to the new card. You pay no interest during the promotional period. When the period ends, the rate jumps to the card's regular APR (often 20-25%).
The Transfer Fee
Almost all balance transfer cards charge a transfer fee: typically 3-5% of the transferred amount. On a $10,000 balance, that's $300-500 upfront. You must factor this into your savings calculation. If you're transferring $10,000 at a $400 fee, you need to save more than $400 in interest to come out ahead — which at 22% APR on the original card, you almost certainly will if you use the promotional period well.
The Only Way It Actually Saves Money
You must pay off the entire transferred balance before the promotional period ends. If you reach month 18 with a remaining balance, the full interest rate kicks in on whatever remains. The card company is betting you won't pay it all off. Prove them wrong by dividing your balance by the number of months in the promotional period and treating that number as your minimum monthly payment.
What Not to Do
Don't use the new card for new purchases. Don't make only minimum payments assuming you'll pay more later. Don't transfer a balance you cannot realistically pay off within the promotional window.
Best Cards for Balance Transfers
Look for cards with the longest 0% period and lowest transfer fee: Citi Simplicity, Chase Slate Edge, and Wells Fargo Reflect are frequently cited for competitive terms. Always compare current offers as terms change.