 In this discussion we will discuss the discussion question of, how is federal income tax FIT withholding calculated? So the FIT withholding, the federal income tax withholding is one of the more complex or the most complex withholding to calculate, more complex than things like social security and Medicare because it's based on a progressive tax system rather than just a simple flat tax system. Meaning when we calculate the social security and Medicare we in essence just take the wages whatever we have to adjust the wages to whatever the Medicare wages or social security wages but once done we just take that number and multiply times the rate that is given one rate and that'll give us the amount of tax and that'll be easy to do. The federal income tax however we have to use tables for or percentage method in order to figure out the federal income tax.