My fiance is a 1099 contractor. We need help figuring out what he actually owes each month as his ex never took him back to court after he changed positions. Right now I am taking his gross pay and subtracting all expenses, then subtracting taxes and then taking 20% of that.

His current pay for the year is about 55,000 but with expenses its $34000. I am worried that once we get to court there is going to be problem or that we did something wrong since this is not cookie cutter like someone who is an actual employee. PLEASE HELP