FITW on your paycheck stands for Federal Income Tax Withholding. It is the amount of money that your employer withholds from your wages to cover federal income taxes. Your employer will use information you provided on your Form W-4, the amount of your taxable income, and how frequently you are paid to determine how much FITW to withhold from each paycheck. The goal is to have at least enough FITW during the year to cover your expected federal income tax liability. The total FITW for the year will be reported on your Form W-2 in box 2. If youre not withholding enough federal tax, its time to adjust your withholding using Form W-4. Your paycheck stub might also show year-to-date totals, which is good to know if you want to estimate if youll have a refund or balance due at the end of the year.