From the U.S. Postal Service to the Executive Office of the President, thousands of federal workers have not paid their 2007 federal income taxes. The Internal Revenue Service is trying to collect billions of dollars in unpaid taxes from nearly half a million federal employees. According to IRS records, 171,549 current federal workers did not voluntarily pay their federal income taxes in 2007. The same is true for 37,752 active duty military and nearly 200,000 retired civilian and military personnel.