text: how can i find out how much taxes their gonna take out of my check now that i have a kid?   it all depends on how many exemptions you claim on your w-4 and how much you make.  the more exemptions, the less they take out.    you should ask whoever is in charge of payroll where you work for a new w-4 (they will know what that is).  if you are single, you should claim either 2 or possibly even 3 exemptions.  btw, i am a cpa.