An examiner cites an IRS publication. Your client cites a private letter ruling issued to a competitor. Neither controls the outcome. Knowing which sources bind and which merely persuade is the whole skill here.
When you support or challenge a tax position, the sources you cite do not all carry the same weight. Federal tax authority is arranged in tiers, from the Constitution and the Internal Revenue Code at the top down to internal IRS instructions at the bottom. A statute beats a regulation, a regulation beats administrative guidance such as revenue rulings, and guidance never beats a statute it misreads.
The table runs from the constitutional grant of taxing power down to the agency's internal instructions, and shows who has to follow each source:
KEY: Where a source sits in the tiers answers two separate questions. First, does it bind the IRS? Second, does it bind a court? The Internal Revenue Manual and IRS publications bind neither.
The Internal Revenue Code (IRC) is the federal tax law itself: Title 26 of the United States Code, enacted by Congress and signed by the President.
Common mistakes
- Treating a PLR as worthless. Candidates read "may not be cited as precedent" and conclude that a private letter ruling has no value. In fact, it is substantial authority for IRC 6662 purposes for any taxpayer. Only citing it as precedent is barred.
- Relying on an IRS publication against the Code. A publication that misstates the law does not bind the IRS, and it will not sustain a deduction the Code does not allow. It can support reasonable cause for a penalty, but the tax itself follows the Code.
- Giving the Internal Revenue Manual legal force. An examiner's failure to follow the IRM does not void an assessment. Use the IRM to press the IRS to follow its own procedures, never as authority for a substantive tax position.
Bottom line
- Hierarchy order: Constitution and ratified treaties, Internal Revenue Code, Treasury regulations, courts, published Bulletin guidance, written determinations, then internal manuals and publications; a Supreme Court reading of the Code overrides a conflicting regulation.
- Treaties and the Code share equal rank; conflicts resolve later-in-time, and the saving clause preserves U.S. taxation of citizens.
- Final and temporary regulations bind; proposed regulations do not, though they still count as substantial authority; temporary regulations expire three years after issuance.
- Revenue rulings apply law to facts, revenue procedures state how to comply, and both bind the IRS as substantial authority.
Exam shortcut
Run every authority question through two gates in order. First gate: does the source bind the IRS? Only the Code, treaties, final and temporary regulations, court decisions, and Bulletin-published guidance do. Second gate: does it bind anyone beyond its own addressee? Written determinations fail this gate even though they passed the first. Stem signals to catch.
The full lesson (about 4,904 words, 33 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- 5
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