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However, any charges you make to the card after the introductory period have a much higher interest rate, and any payments you make to the credit card company are applied to your lowest interest rate balances first. You might not be able to start paying off the higher interest charges for months or years, during which they will accrue a healthy sum of interest for the credit card company. Consider this kind of promotion only if you need to roll a large balance onto a card with a lower interest rate, not if you are looking for a credit card to use on a regular basis. When you have a selection of credit card applications with attractively low rates, consider their default rate. This is the interest rate you will be charged if you are late with a payment, exceed your credit limit, go into default, or commit a host of other credit sins.