Mistake #1: Moving debt but not stopping new spending.
You transfer $4,000 to a new 0% card, feeling relieved. Two months later, you've put another $2,000 on the old card because the limit is back. Now you have $6,000 spread across two cards, and you're back where you started. The balance transfer didn't solve the spending problem—it just reorganized it.
Mistake #2: Assuming you have until the end of the promo period.
If your promotional 0% APR runs for 12 months, don't plan to pay off the balance on month 12. Life happens. Target month 10 and build in a 2-month buffer. Otherwise, when an emergency hits in month 11, you're stuck with a balance that's now accruing 19% interest.
Mistake #3: Not reading the fine print.
Some balance transfer cards charge a foreign transaction fee, annual fee, or have a higher interest rate if you miss a payment. A missed payment during the promotional period can kill the 0% offer entirely—your rate jumps to the regular APR instantly. Read the cardholder agreement.
Mistake #4: Chasing rewards instead of rates.
A card with a 0% APR for 18 months is better than one with 0% for 12 months, even if the 12-month card gives you 2x points. You're trying to pay down debt, not build points. Pick the best rates first.
Mistake #5: Ignoring the grace period on purchases.
Many balance transfer cards have a shorter grace period for new purchases (or no grace period). Any new charges start accruing interest immediately. If you use the card for everyday spending while paying down the balance transfer, you're inadvertently shifting money around—interest on the new purchases competes with your debt paydown.
Mistake #6: Using a balance transfer as a band-aid.
A balance transfer is a tactical tool for paying down existing debt faster. It's not a solution if the underlying problem is that you spend more than you earn. If you transferred a $3,000 balance and then charged another $3,000 three months later, the balance transfer didn't fail—your spending plan did.