So you get to the checkout of your favorite department store and the friendly cashier says, “Would you like to open a store credit card with us today? You’ll receive 10% off your purchase.”  Don’t do it!  While it’s tempting, it’s just not worth it. First, the interest rates on in-store cards are often incredibly high, some approaching 30% annually. Second, the card itself will tempt you. You want to go shopping, you look in your wallet, no cash, but AH HA..the department store card is there..you can go spend cash you don’t have! So think about it, you may save $10 or $20 at the register, but how much will you pay later?