TaxSites.com provides links to various tax policy web sites.
Tax Policy Center www.taxpolicycenter.org provides analysis of tax issues
American Bar Association Tax Section http://www.abanet.org/tax/sites.html
Tax Foundation http://www.taxfoundation.org/
OpenCRS www.opencrs.com The Congressional Research Service provides reports to the U S. Congress on issues. CRS does not make their reports available to the general public but a number of agencies and other organizations do make them available. OpenCRS is a non profit group working to make these valuable resources available. You may also search for CRS reports relatiing specifically to tax through BloombergLaw and CCH Intelliconnect.
Internal Revenue Service www.irs.gov
Joint Committee on Taxation www.jct.gov The Joint Committee on Taxation is a nonpartisan committee of the United States Congress originally established under the Revenue Act of 1926. The JCT operates with an experienced professional staff of Ph.D economists, attorney, and accountants who assist Congress on tax legislation. The JCT publishes a number of reports including the Bluebooks, which are detailed explanations of tax legislation passed within a given year.
Congressional Budget Office www.cbo.gov CBO's mandate is to provide the Congress with objective, nonpartisan and timely analyses to aid in economic and budgetary decisions on the wide array of programs covered by the federal budget and the information and estimates required for the Congressional budget process. One of the topics that the CBO reports on is Taxes.
U. S. Department of the Treasury www.treasury.gov
The Department of Treasury has an Office of Tax Policy. The Treasury Department produces General Explanations of the Administration's revenue proposals (known as the Green Books). Treasury also produces a number of reports relating to tax policy. The Department of Treasury would also be a good resource for statistical and economic information.