Now that we can all (well, most of us anyway) breathe a sigh of relief with tax season behind us, you might be taking stock of your personal finance inventory and are considering a new cash back credit card. If you've got good-to-excellent credit but a small balance that you're ready to pay down with that tax return you were just rewarded compliments of Uncle Sam, there are even some 0 percent cash back options that can save you some dough while earning you some dough.