There are many great sites on the World Wide Web but trying to actually find those great sites can be a frustrating experience. We have compiled a list of Websites that we have found to be helpful resources of information. When you click on a link, a new window will pop up. Close the window when you are ready to return to this page. Illinois State Department of Revenue Home of the Illinois Department of Revenue on the Web. The IDOR has definitely done a great job on their Website. Tax The Internal Revenue Service Home of the IRS on the Web. The IRS has definitely done a nice job on their Website. Social Security Administration Home of the Social Security Administration on the Web. The SSA has definitely done a nice job on their Website. EFTPS Home of the Electronic Funds Transfer Program on the Web.