You are required to list all creditors. However, if you do not have any balance owed on a credit card, then that party usually would not be listed. Sometimes a low balance credit card is paid off before filing bankruptcy in order to avoid the need to list that credit card. However, unless the amount is rather small, that payment could be a "preferential payment" that the bankruptcy court trustee can make them give back. The size of the debt that you pay off is what matters. The lower, the better.