Credit cards can be used to build your credit, as long a you use them responsibly. Using credit cards for your gift shopping is almost a holiday tradition in itself. Unfortunately, many people not only underestimate how much they spend for holiday purchases, but then don’t pay off their holiday purchases when the credit card bill arrives in January. The end result is a mountain of debt. According to a Consumer Reports holiday shopping survey, 14 million shoppers are still paying off debt from the 2010 holiday season.