Representation before the IRS · Legal Authority and References
Case law
tax year · reviewed 2026-08-18 · I. Ohu
Court cases are on the closed authority list, and they are the only authority on it the IRS did not write. But not every decision counts the same. A Supreme Court decision binds the Service everywhere; a decision of the Tax Court, a District Court or the Court of Federal Claims binds it “only for the particular taxpayer and the years litigated.” Everything else here follows from that gap — including why the acquiescence programme exists.
The rule
Weight. See the figures table (IRM 4.10.7.2.8.8). “A case decided by the US Supreme Court becomes the law of the land and takes precedence over decisions of lower courts. The IRS must follow Supreme Court decisions. For examiners, Supreme Court decisions have the same weight as the IRC.” Lower court decisions “are binding on the IRS only for the particular taxpayer and the years litigated,” and “adverse decisions of lower courts do not require the IRS to alter its position for other taxpayers.”
The Tax Court’s three kinds of decision. See the figures table (IRM 4.10.7.2.8.2).
- Regular opinions “involve more than mere factual determinations or applications of well established legal principles. They generally involve new decisions on points of law that set precedents.”
- Memorandum decisions “primarily involve factual determinations and the application of well-established legal rules,” and “do not warrant publication in bound volumes in the opinion of the Court.”
- Small tax case decisions, elected within the ceiling in the figures table, are “final and may not be appealed by either party” and “have no precedential value” (IRC § 7463).
Citation conventions. A regular Tax Court decision is cited by case name, volume and page — the IRM’s example is Richard A. Sutter, 21 TC 170 — and “the term ‘v. Commissioner’ is not used in citing USTC cases.” Memorandum decisions are cited to the commercial reporters. Examiners are told to be careful not to cite a Tax Court case decided against the Government unless it has been acquiesced in, marking it acq. or nonacq.
Where the other courts sit. District Courts are “the primary federal courts of original jurisdiction” and “the only court where taxpayers can request a jury trial.” They and the Court of Federal Claims hear tax cases “after the taxpayer has paid the tax and filed a claim for refund or credit.” District Court appeals go to the regional circuit, Court of Federal Claims appeals to the Federal Circuit, and the Supreme Court may review a Court of Appeals decision at its discretion.
Action on Decision. See the figures table (IRM 4.10.7.2.8.8.1). It is “the policy of the IRS to announce at an early date whether it will follow the holdings of lower courts in certain cases.” An AOD is issued only on unappealed issues decided adverse to the government, is not an affirmative statement of IRS position, is “not intended to serve as public guidance,” and “may not be cited as precedent.”
The three recommendations. See the figures table. Acquiescence and acquiescence in result only both mean the IRS accepts the holding and will follow it on the same controlling facts; the difference is that acquiescence “indicates neither approval nor disapproval of the reasons assigned by the court,” while acquiescence in result only “indicates disagreement or concern with some or all of those reasons.” Nonacquiescence means the IRS does not agree and generally will not follow the decision for other taxpayers — though “the IRS will recognize the precedential impact of the opinion on cases arising within the venue of the deciding circuit.”
Scope of the programme. “Prior to 1991, the IRS published acquiescence or nonacquiescence only in certain regular Tax Court opinions.” It now reaches memorandum Tax Court opinions and decisions of the District Courts, the Court of Federal Claims and the Circuit Courts of Appeal, and every AOD recommendation is published in the Internal Revenue Bulletin (IRM 4.10.7.2.8.8.1–.2).
Board of Tax Appeals decisions. The BTA is the Tax Court’s predecessor. Many decisions “retain precedential value,” but one “may be based upon an authority that is obsolete and all references to the IRC are to a pre-1954 IRC.”
Case law is authority; an AOD is authority too. “Court cases” appear on the closed list in Reg. § 1.6662-4(d)(3)(iii), as do “actions on decisions … issued after 12 March 1981.” An AOD may not be cited as precedent and is still on the authority list.
Current figures
| Item | Rule | Authority |
|---|---|---|
| Weight of decisions | a Supreme Court decision becomes the law of the land, takes precedence over lower courts, must be followed by the IRS, and for examiners has the same weight as the Code; decisions of the Tax Court, District Courts and the Court of Federal Claims bind the IRS only for the particular taxpayer and the years litigated, and an adverse lower-court decision does not require the IRS to alter its position for other taxpayersTY2026 | IRM 4.10.7.2.8.8 |
| Tax Court opinion types | 3 — regular opinions, which involve more than mere factual determinations or applications of well-established principles and generally decide new points of law that set precedents; memorandum decisions, which primarily involve factual determinations and the application of well-established rules; and small tax case decisions, which are final, may not be appealed by either party, and have no precedential valueTY2026 | IRM 4.10.7.2.8.2; IRC § 7463 |
| Action on Decision | issued at the IRS's discretion only on unappealed issues decided adverse to the government; it is not an affirmative statement of IRS position, is not intended as public guidance, and may not be cited as precedent — relied on within the IRS only as the conclusion applying the law to the facts of that case at that timeTY2026 | IRM 4.10.7.2.8.8.1 |
| The three recommendations | 3 recommendations — acquiescence, meaning the IRS accepts the holding and will follow it on the same controlling facts, indicating neither approval nor disapproval of the court's reasons; acquiescence in result only, same acceptance but signalling disagreement or concern with some or all of those reasons; and nonacquiescence, meaning the IRS does not agree and generally will not follow the decision for other taxpayers, though it recognises the precedential impact within the deciding circuitTY2026 | IRM 4.10.7.2.8.8.1 |
| Small tax case | available where neither the deficiency in dispute nor any claimed overpayment exceeds $50,000 for any one taxable year (subtitle A), at the taxpayer's option concurred in by the Tax Court before hearing — the decision is not reviewable in any other court and is not treated as precedentTY2026 | IRC § 7463(a)–(b) |
| When authority ceases | an authority stops being one to the extent it is overruled or modified, implicitly or explicitly, by a body with power to do so — but a Tax Court opinion is not treated as overruled by a court of appeals to which the taxpayer has no right of appeal unless the Tax Court adopts that holding, and a private letter ruling is not authority if revoked or inconsistent with a later proposed regulation, revenue ruling or IRB pronouncementTY2026 | Reg. § 1.6662-4(d)(3)(iii) |
How it works in practice
A favourable lower-court decision does not settle the question. It binds the Service for that taxpayer and those years only. So a client pointing to a Tax Court case they read about has found an authority, not an answer — and the next step is to find out whether the Service acquiesced, nonacquiesced, or said nothing.
Check the AOD before relying on a taxpayer win. The IRM instructs examiners not to cite a Tax Court case decided against the Government unless it has been acquiesced in. A representative should run the same check in reverse: a decision the Service has nonacquiesced in will be resisted everywhere except within the deciding circuit, and that changes the settlement posture.
“Acquiescence in result only” is a signal, not a technicality. It means the Service accepts the outcome but is uncomfortable with the reasoning. Building an argument on the reasoning of a case the Service has acquiesced in only as to result is building on the part it has flagged. Use the holding.
Nonacquiescence is geographically limited in its effect. The Service will not follow the decision nationwide, but it recognises the precedential impact within the deciding circuit. Where the client is in that circuit, a nonacquiescence is far less damaging than it looks. Where they are not, it is worse than it looks.
Regular versus memorandum tells you what the case decided. A regular opinion generally decides a new point of law; a memorandum decision applies settled law to facts. For a legal proposition the regular opinion carries further; for a factual pattern — reasonable cause, substantiation, trade or business — a memorandum decision on close facts may be more useful, and it is still a court case on the authority list.
Small tax case decisions are worth nothing to anyone else. No appeal by either party, no precedential value. They are invisible in a research file, and a client who won one has no authority to give the next taxpayer.
Forum choice is a prepayment question first. The Tax Court hears the case before payment; the other two after full payment and a refund claim. Only the District Court offers a jury. Appeals run to the regional circuit and to the Federal Circuit respectively, so the governing appellate law can differ by forum on the same facts.
Cases go stale, and the regulation says how. Reg. § 1.6662-4(d)(3)(iii) withdraws authority status to the extent a decision is overruled or modified — with the refinement that a Tax Court opinion is not treated as overruled by a court of appeals to which the taxpayer has no right of appeal, unless the Tax Court adopts that holding. Date-check and citator-check anything relied on.
The case the client found
A client sends a Tax Court decision squarely supporting his position and asks why the examiner is not simply following it.
Analysis. Because it does not bind her. IRM 4.10.7.2.8.8 records that decisions of the Tax Court, District Courts and the Court of Federal Claims are binding on the IRS "only for the particular taxpayer and the years litigated," and that adverse lower-court decisions do not require the IRS to alter its position for other taxpayers. The case is authority and belongs in the weighing. The next question is whether the Service has issued an Action on Decision, and what it says.
The nonacquiescence that mattered less than feared
Research turns up a Court of Appeals decision favourable to the client's position, and an AOD recording nonacquiescence. The client's principal place of business is within that circuit.
Analysis. Better than it first looks. Nonacquiescence means the IRS will not follow the holding on a nationwide basis, but the IRM records that "the IRS will recognize the precedential impact of the opinion on cases arising within the venue of the deciding circuit." Inside the circuit the decision governs. The representative should say so expressly in the protest, and should confirm the venue point rather than assume it.
The reasoning the Service did not accept
A memorandum builds its argument on the analytical framework set out in a Tax Court opinion. The AOD records "acquiescence in result only."
Analysis. The argument is built on the wrong half. Acquiescence in result only means the IRS accepts the holding of the court and will follow it on the same controlling facts, but "indicates disagreement or concern with some or all of" the court's reasons. Relying on the reasoning invites exactly the disagreement the Service has already recorded. Restate the argument on the holding and the controlling facts.
The small case that proved nothing
A colleague reports that a taxpayer with identical facts won in the Tax Court last year, and proposes to cite the decision.
Analysis. Check which procedure it was heard under. A decision in a case handled under the small tax case procedures is final, may not be appealed by either party, and has no precedential value — IRC § 7463(b) and IRM 4.10.7.2.8.2.1. If the docket number ends in S it is a small tax case and there is nothing to cite. The underlying authorities the court relied on may still be worth reading.
Lower court decisions bind the IRS only for that taxpayer and those years. Only the Supreme Court binds it generally.
Small tax case decisions have no precedential value and cannot be appealed by either party.
An Action on Decision may not be cited as precedent — and is still on the Reg. § 1.6662-4 authority list if issued after 12 March 1981.
Nonacquiescence is national in refusal, local in effect. The IRS still recognises the decision’s precedential impact inside the deciding circuit.
How this has changed
The acquiescence programme was widened in 1991. Before then the IRS published acquiescence or nonacquiescence “only in certain regular Tax Court opinions.” It now extends to memorandum Tax Court opinions and to decisions of the District Courts, the Court of Federal Claims and the Circuit Courts of Appeal. Material describing acquiescence as a Tax Court regular opinion practice is pre-1991.
Actions on Decisions joined the authority list with a date. Reg. § 1.6662-4(d)(3)(iii) admits “actions on decisions and general counsel memoranda issued after 12 March 1981,” with a separate allowance for GCMs published in pre-1955 Cumulative Bulletin volumes. Those dates track release practice and have not moved.
The Court of Federal Claims has been renamed twice. It was the Court of Claims, then the United States Claims Court, and is now the United States Court of Federal Claims — with reporter citations changing accordingly (Cl. Ct., then Fed. Cl., from October 1982). Older citations in a research file will use the earlier names.
Board of Tax Appeals decisions predate the 1954 Code. They may retain precedential value, but every Code reference in them is to a pre-1954 Code. Any BTA authority needs the cross-reference worked through before it is relied on.
Read the IRM section’s own date. IRM 4.10.7.2.8 carries revision dates of 1 January 2006 for most of the case law subsections, with a 12 September 2022 revision at 4.10.7.2.8.8.2. It is the clearest statement the Service publishes of how it weighs court decisions, and the citation examples in it are correspondingly old.
Exam focus
Know that a Supreme Court decision binds the IRS and, for examiners, has the same weight as the Code — while lower court decisions bind it only for that taxpayer and those years.
Know the Tax Court’s three kinds of decision: regular (new points of law, precedential), memorandum (facts and settled law), and small tax case (final, unappealable, no precedential value).
Know that an Action on Decision is issued only on unappealed issues decided against the government, is not an affirmative statement of IRS position, and may not be cited as precedent.
Know the three recommendations — acquiescence, acquiescence in result only (accepts the holding, disagrees with some reasoning), and nonacquiescence — and that nonacquiescence still leaves the decision effective within the deciding circuit.
Know that the District Court is the only forum offering a jury, and that it and the Court of Federal Claims require full payment and a refund claim first.
Know that appeals run from the District Court to the regional circuit and from the Court of Federal Claims to the Federal Circuit.
Check yourself
1. A Tax Court decision goes against the IRS. What must the IRS do for other taxpayers? (A) Follow it nationwide (B) Nothing — a lower court decision binds it only for that taxpayer and those years (C) Issue a revenue ruling (D) Appeal it Answer: B. IRM 4.10.7.2.8.8. Only Supreme Court decisions bind the Service generally.
2. Which Tax Court decisions have no precedential value? (A) Regular opinions (B) Memorandum decisions (C) Decisions under the small tax case procedures (D) All Tax Court decisions Answer: C. They are also final and may not be appealed by either party.
3. What does “acquiescence in result only” mean? (A) The IRS rejects the decision entirely (B) The IRS accepts the holding but signals disagreement or concern with some or all of the court’s reasoning (C) The IRS will follow the decision only in the deciding circuit (D) The decision is under appeal Answer: B. Plain “acquiescence” indicates neither approval nor disapproval of the court’s reasons.
4. May an Action on Decision be cited as precedent? (A) Yes, once published in the Internal Revenue Bulletin (B) Yes, by IRS personnel only (C) No — but it is still on the Reg. § 1.6662-4 authority list if issued after 12 March 1981 (D) No, and it is not authority in any sense Answer: C. It is not an affirmative statement of IRS position and is not intended as public guidance.
5. In which forum may a taxpayer request a jury trial? (A) The U.S. Tax Court (B) The U.S. Court of Federal Claims (C) A U.S. District Court (D) Any of the three Answer: C. It is the only court where a jury may be requested, and it requires full payment and a refund claim first.
Change log
- Initial publication from IRM 4.10.7, IRC § 7463, and Reg. §§ 1.6662-4 and 601.601, each opened at source.