Tax Research Information and Tools

Tax practitioners provide tax advice to clients and should be familiar with the applicable standards for providing such advice, including Circular 230, the AICPA’s Code of Professional Conduct, and the AICPA’s Statements on Standards for Tax Services (SSTSs). CPAs need to keep excellent documentation of all tax research in accordance with these standards.

CPAs should also maintain an appropriate research library. Maintaining a tax research library is different for each CPA firm and will depend on the practice areas, size of the client base, and budget. With any tax research library, the relative authority must be kept in mind. Some sources are not authoritative and provide only guidance; these sources should not be cited as legal authority. It's also important to distinguish between primary and secondary sources. Primary sources are documents issued by the government. Secondary sources are prepared by vendors who provide tax research services, legal analysts, scholars, and tax professionals.

This resource page serves to help members understand the hierarchy of taxing authorities, effectively perform and document client research, and communicate findings to clients and other stakeholders.

AICPA Resources

External Resources

  • Legal Bitstream: Provides a database offering of advanced searches for tax cases (1990 to present), regulations, and many other administrative documents.
  • IRS Guidance for Tax Professionals: Contains primary federal sources, forms, publications, and other items from the IRS.
  • Legal Information Institute at Cornell Law School: Contains primary U.S. federal and state sources and a secondary source legal dictionary and encyclopedia (Wex) built by the law school.
  • Harvard Law School: Contains primary U.S. federal and state sources, U.S. treaties, foreign and international law, and a number of secondary sources (journals, legal dictionary, encyclopedia, etc.).
  • NYU Law School - GlobaLex Hauser Global: Contains guides dedicated to international and foreign law research. Guides provide overviews and references to primary and secondary sources.
  • Internal Revenue Manual (IRM): Discusses the procedures that IRS employees must follow to administer fair tax administration (this is essentially the IRS's employee handbook).  

 This symbol identifies tools and resources available exclusively for Tax Section members. When accessing premium member-only content within the Tax Resource Library, you will be prompted to enter your user ID and password to validate your Tax Section membership. Not a member? Learn more about these premium resources along with the many other benefits of membership in the AICPA Tax Section.

Reviewed May 16, 2017