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Is it possible for me to keep my credit card APR at 0% permanently?
If you pay your statement balance in full before the due date you will never pay a cent in interest no matter what your interest rate is.*  In fact, I don't even know what my interest rates are. Credit card companies offer this sort of thing in the hopes you will spend more than you can afford to pay completely in those first 15 months.  * Unless you use a cash advance, with those you will accrue interest immediately upon receiving the cash sometimes with an additional fee on top.