Internal Revenue Service - Official Site

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Tax Organizations

Federation of Tax Administrators (FTA)
Mission is to improve the quality of state tax administration by providing services to state tax authorities and administrators. Services include research and information exchange, training, and intergovernmental and interstate coordination.

National Association of Computerized Tax Processors
Links to the IRS and state sites which have tax forms available for download.

National Association of Tax Practitioners
Nonprofit professional association dedicated to excellence in taxation.  NATP was formed to serve professionals who work in all areas of tax practice. Members include CPAs, individual practitioners, enrolled agents, accountants, attorneys, and financial planners.

National Tax Association (NTA)
Nonpolitical, nonpartisan, nonprofit membership organization that aims to foster study and discussion of issues in tax theory, practice, and policy, and other aspects of public finance.

Tax History Project
Provides information on the history of U.S. taxation, including historical documents and a collection of presidential tax returns.

Tax Research Analysis Center
Offers legislatures, municipal governments, and the public sector research and analysis in assessing taxation proposals and public finance issues.

The Tax Foundation
Nonprofit, nonpartisan educational organization that monitors fiscal policies at the federal, state, and local levels.

Tax Law

Department of the Treasury
Formulates economic, fiscal and tax policies, enforces the law, protects the President and other officials, and manufactures currency.

U.S. Tax Code Online
Allows access to the complete text of the U.S. Internal Revenue Code, Title 26 in a variety of ways.