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Updated September 24, 2024
Reliance on Treasury Department and IRS Tax Guidance

The Department of the Treasury (Treasury) and Internal
Revenue Service (IRS) use several forms of guidance to
help taxpayers understand the Internal Revenue Code (IRC)
and to inform taxpayers of Treasury and the IRS's position
on particular tax issues. For the most part, this tax guidance
can be split into three categories: (1) Treasury regulations,
(2) sub-regulatory guidance published in the Internal
Revenue Bulletin (IRB), and (3) unpublished sub-regulatory
guidance (i.e., sub-regulatory guidance not published in the
Federal Register or the IRB). Former heads of the IRS's
Office of Chief Counsel have remarked that the type of
guidance issued reflects a balance between taxpayers' need
for certainty and the need of Treasury and the IRS for
latitude in administering tax laws.
In a tax dispute, taxpayers generally may rely on Treasury
regulations and sub-regulatory guidance published in the
IRB (e.g., revenue rulings, revenue procedures, notices, and
announcements) to support their tax position, as long as the
guidance is not contrary to or inconsistent with the law and
subsequent guidance does not render it moot. Taxpayers are
generally unable to rely on unpublished sub-regulatory
guidance (e.g., forms, instructions, and publications) in tax
disputes. Given that Treasury and the IRS often issue
unpublished sub-regulatory guidance in response to time-
sensitive issues, taxpayers may exercise caution when the
need for clarity and certainty is at its greatest, and might
wait for Congress to potentially enact clarifying legislation
or for courts to address the legal issue in litigation.
This In Focus analyzes the ability of taxpayers to rely on
valid Treasury regulations and the more common types of
published sub-regulatory tax guidance.
Common Types of Published Treasury
and VRS Tax       udance
Treasury Regulations
Treasury regulations are the most important type of tax
guidance issued by Treasury and the IRS. Treasury
regulations can provide guidance on newly enacted
legislation and tax issues that arise with respect to
preexisting laws. Taxpayers may rely on final and
temporary Treasury regulations, but may not rely on
proposed Treasury regulations unless they contain an
express statement permitting reliance.
Generally, proposed Treasury regulations are published in
the Federal Register as a Notice of Proposed Rulemaking,
which invites the public to review and comment on the
proposed regulation. Treasury and the IRS may modify or
withdraw a proposed Treasury regulation based on the
comments they receive. After considering the public's
comments, Treasury and the IRS may issue a final

regulation and publish it in the Federal Register as a
Treasury Decision.
Treasury and the IRS issue temporary Treasury regulations
when they conclude that the public requires immediate
guidance before the publication of final Treasury
regulations. Temporary Treasury regulations are also
published in the Federal Register as Treasury Decisions,
but expire after three years. When Treasury and the IRS
issue a temporary Treasury regulation, they simultaneously
issue a corresponding proposed Treasury regulation.
Signaling a significant change in procedure, a memorandum
of agreement between Treasury and the Office of
Management and Budget (OMB) dated June 9, 2023,
superseded an earlier memorandum dated April 11, 2018,
so that tax regulations no longer undergo the standard
centralized review process under Section 6 of Executive
Order 12866 conducted by the OMB's Office of
Information and Regulatory Affairs (OIRA).
Revenue Rulings
Revenue rulings are the IRS's official interpretation of tax
laws, related statutes, tax treaties, and regulations as applied
to a specific set of facts. They are published in the IRB.
Taxpayers may rely on revenue rulings when the taxpayer's
facts are substantially the same as the facts addressed in the
revenue ruling. Revenue rulings foster uniformity and
enable taxpayers to make informed decisions about their tax
obligations. Revenue rulings do not carry the same level of
authority as Treasury regulations.
Revenue Procedures
The IRS announces administrative practices and procedures
through revenue procedures published in the IRB. A
revenue procedure can provide information on filing a
return or other instruction to enable a taxpayer to reach a
particular result. Revenue procedures cover diverse topics,
such as the adoption of accounting methods, the
computation of certain expenses, the current value of
inflation-adjusted items in the tax code, and how to request
a waiver for electronic filing. Taxpayers may rely on
revenue procedures when their facts are substantially the
same as those described in the revenue procedure. Like
revenue rulings, revenue procedures do not have the same
level of authority as Treasury regulations.
Announcements and Notices
The IRS makes time-sensitive public pronouncements
through announcements and notices. Announcements have
immediate or short-term value. They can summarize laws
and regulations without making substantive interpretations,
explain forthcoming regulations, and notify taxpayers of
approaching deadlines. Notices may contain substantive
interpretations of the IRC or other laws. The IRS has used
notices to inform taxpayers of the types of transactions that

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