Low interest credit cards keep the dangers of snowballing debt low, even for those consumers that carry a higher balance. Look - anytime you can avoid carrying a balance, you should. No matter how low an interest rate is, any interest paid still hurts your overall bottom line. That said, sometimes carrying a balance is unavoidable - be it because of emergencies or otherwise - and in those instances, having a low ongoing interest is crucial to your ability to pay down your debt.