The AICPA is the world’s largest member association representing the accounting profession. Includes Audit & Accounting Guides, Professional Standards, and Technical Practice Aids.
Full text of the Internal Revenue Code (26 USC.) The Code is searchable and viewable, but there is no download or print capability other than that provided by the web browser being used to access it. (For easier downloading of particular sections of the code, go to Title 26 of the U.S. Code) This site is maintained by John Walker.
This guide on federal tax research explains where and how to find tax materials. Some resources may not be available to non-Georgetown affiliated users.
HeinOnline contains the full U.S. Code. Title 26 of the U.S. Code contains nearly all of the federal tax laws. This title is commonly referred to as the "Internal Revenue Code" (IRC) or sometimes simply as "The Code."
An ever-expanding database that specializes in offering original PDF copies of full-runs of legal collections. It includes: most major legal periodicals, federal and state statutes, court decisions, attorney general reports and opinions, federal legislative history materials, treaties, foreign & international law material, and numerous specialized legal collections. The text of collections are fully searchable and there are tools to browse or find items by citation.