They'll report as usual. Time your transfer carefully or you may end reporting the balance on both cards. For example, after school shopping I wanted to transfer the balance to get my 0% apr on my NFCU card. NFCU cut the bt check to send to my other CCC, when the check cut my balance on NFCU increased by the amount of the check. BUT, becasue of the reporting times, the original CCC had already reported the balance. So for that month, I carried a "ghost" balance.
