You can roll debt payments over to the next one. Some issuers charge transaction fees as high as 4 percent. So the bigger the amount transferred, the bigger the fee. Slip-ups are costly, too. Low interest rates can evaporate with one tardy payment.
Lenders view open credit lines as potential outstanding debt.
Plus, each credit card application requires a check on a customer's credit record, and lenders view frequent inquiries as a sign of iffy credit. Try to pay off the balance during the low-rate introductory period. To avoid racking up unused credit lines, be sure to cancel the old credit card account after transferring a balance to a new one. Credit card issuers commonly slap the highest possible interest rate on people who close accounts with a balance remaining. They know they've lost you as a customer already, so they care little about offending you.