Warm pox greetings to all of my tax-planning friends out there. ("Pox" is a common firewater found in Chiapas, Mexico.) Anyway, it's time for my annual Free Money! to show you how much income you can earn before you owe Uncle Sam any federal income tax. This post will also help you determine your tax liability at the end of the 10% and 12% tax brackets. The point of this post is to remind you just how useful a basic tax plan can be. Remember, you (not the government) should be the one deciding how much you'll pay in federal income taxes! Free Money!, What's That? Free Money! refers to the amount of income that: you can earn before you owe any federal income tax. FM! represents your  0% tax rate  for your federal income taxes (not your state or FICA tax rate). The FM! calculation for most people consists of two components: 1.) the  standard deduction  and 2.) the  child tax credit .…