I've got a card that is coming up for renewal that I used for a recent 0% balance transfer option. Does anybody know if you cancel a card but leave a balance to pay off if the promotional APR generally remains in place through it's original expiration date, or would they revert the balance back to the regular card APR? It's not a huge amount and I plan to pay it off within a few months so if the card reverts to the regular APR I think I'd be better off just leaving it open and paying the annual fee again vs. having to pay interest for a few months.