Government Sites Social Security Administration Social Security Administration administers retirement, medicare, disability and other benefits. U.S. Small Business Association Programs and services to help you start, grow and succeed. U.S. Department of Commerce U.S. Department of Commerce Federal Citizen Information Center A catalog of Free and low-cost federal publications that may be of interest to you. Also contains a lot of important consumer information. Tax Information Sites IRS The IRS website has many great tax resources for you. IRS W4 Form This form is used to determine federal income tax.