To determine which credit card balance should take priority, make a list of what you owe, detailing balances and interest rates. Then pick a strategy.
Some consumers prefer to focus the highest-rate debt first (a.k.a., the avalanche method); others knock out the smallest balance first (a.k.a. the snowball method), said Greg McBride, chief financial analyst at Bankrate.com. The former saves you more in interest, while the latter can free up money in your budget to roll into paying down other debts.
Factor in any interest-free balance transfer or other promotional offers, and when they end, said Papadimitriou. Although that's technically your lowest-rate debt, it may be a more pressing priority if you'll soon have a much higher rate.