1) Income tax 2) Pay stub acronym 3) Pay stub acronym, often 4) Pay stub figure 5) Pay stub letters 6) Pay-envelope initials 7) Pay-stub acronym 8) Pay-stub initials 9) Pay-stub inits 10) Pay-stub letters 11) Paycheck deduction 12) Paycheck deduction fig 13) Paycheck deduction letters 14) Paycheck initials 
Federal Insurance Contributions Act, a mandatory withholding used for Social Security. 
Federal Insurance Contributions Act
[n] - a tax on employees and employers that is used to fund the Social Security system
noun a tax on employees and employers that is used to fund the Social Security system
Federal Insurance Contributions Act: U.S. government legislation under which taxes are levied for the support of Social Security.