REG Tax Research · Updated November 2026
IRS Publication or Internal Revenue Code: Which Authority Is Stronger?
Use secondary sources to understand and locate the law. Use primary authority to support the legal conclusion.
Primary authority
Primary tax authority can include the Internal Revenue Code, Treasury Regulations, judicial decisions, and qualifying administrative pronouncements.
Secondary authority
Secondary sources include treatises, articles, study guides, and commercial research commentary.
IRS publications
IRS publications can be useful explanations but are not automatically equivalent in authority to the Code or Treasury Regulations.
Court authority
The weight of a judicial decision can depend on the court, jurisdiction, and contrary authority.
The takeaway
Primary authority carries legal weight. Secondary authority explains or analyzes primary authority.
Related Summit guides
FAQ
Is the Internal Revenue Code primary authority?
Yes.
Is a CPA review textbook primary authority?
No.
Can court cases be primary authority?
Yes.