Accuracy Tip: get out your last regular week's paycheck of 40 hours with no overtime. enter your info above, press calculate, then change the "Ben Tax Rate" (which is all of your benefit and state taxes added together in 1 rate) and keep calculating until "Your Paycheck" amount matches what the check says in your hand. save that number, and from there, any variation in hours or pay rate (as long as your benefits don't change and you don't move to another state) will be exactly what you're supposed to be getting on your check.