Executive answer
The proposition that a taxpayer does not indefinitely acquire the right to use any transfer pricing method should not be attributed to amparo review 293/2025. Available official documents show that this case, resolved by Mexico’s Supreme Court on January 8, 2026, addresses Article 21 of the 2024 Federal Revenue Law and the rate used to calculate income tax on interest payments.
The discussion of method priority, nonretroactivity and the absence of an acquired right to continue determining prices in the same way appears in amparo review 461/2007 and its official publication. Correcting the source does not remove the topic’s usefulness. It requires readers to examine facts, historical statute, document type and status before applying the proposition to a current policy.
Verification closed on August 2, 2026. The January 8, 2026 event is the resolution of AR 293/2025, but that does not make it the source of the transfer pricing methodology proposition. Check official text and current law before citing.
What was verified
The review compared the official AR 293/2025 draft, the session transcript, the official AR 461/2007 judgment and the Judicial Weekly record. Their subject matter, provisions and reasoning are not interchangeable.
Editorial control maps every proposition to its exact source. A shared reference to “acquired rights” or “interest” does not support attribution of a transfer pricing rule.
What AR 293/2025 concerns
The official draft describes a constitutional controversy involving Article 21 of the 2024 Revenue Law as part of the 0.50% rate system for income tax on interest payments. The transcript confirms that the full Court resolved the case on January 8, 2026.
Using that number to claim the Court changed method selection in 2026 would therefore be inaccurate. A monitor should record the decision under its real subject and separate any incidental reference.
Where the methodology proposition appears
AR 461/2007 considered, among other issues, statutory method priority and a nonretroactivity argument. The decision explained that no indefinite entitlement exists to use without limitation any historically available method.
Read that reasoning with the provision, year and legal framework then examined. It is not permission to change arbitrarily and does not mean history never matters.
Judgment, thesis and binding case law
Identify whether the source is the judgment, an isolated thesis, a precedent or binding case law. Each document has a different function and authority. The official record can include the decision and thesis references.
Do not label it “2026 case law” merely because a search engine recrawled or refreshed a document. Use the official decision and publication dates.
The defensible proposition
Historical consistency alone does not create a property right to retain a method against a different applicable rule or facts making another method more appropriate. Selection must be justified for each year under relevant law and operations.
At the same time, an unexplained change can weaken comparability and credibility. History is evidence and context even if it is not an unlimited acquired right.
Request a source-and-impact verification to distinguish the case, status, real rule, comparable facts and actions before citing a judgment in policy, audit or litigation.
Impact on method selection
Review current Article 180 of the Mexican Income Tax Law, the interpretive role of OECD guidance and the transaction’s facts. Document why one method is appropriate and why alternatives are not.
Do not use AR 461/2007 as a substitute for current analysis. It helps address a claim of absolute immutability; it does not automatically choose CUP, TNMM or another method.
Consistency across years
Build a chronology of method, tested party, indicator, comparables, ranges, contracts, functions and results. Identify reforms and operational changes. Distinguish genuine continuity from mechanical repetition.
If retaining the method, explain why facts remain aligned. If changing, document the event, alternatives assessment, approval and transition.
Triggers for change
Restructuring, a new product, valuable function, different risk, internal comparable, loss of data, contract change or reform may require reassessment. An out-of-range result alone does not prove the method is wrong.
Define triggers in the policy and test them before year-end, not after an audit begins.
Methodology matrix
Include transaction, years, law, prior method, proposed method, data, FAR, comparables, advantages, limitations, outcome, tax difference and evidence. Add a reason-for-change column.
Someone other than the author should reproduce the matrix. Avoid conclusions relying only on “consistent with prior years.”
Functional analysis
Selection depends on who performs functions, uses assets and controls risks. Interview operations and compare contracts with conduct. Changes in people or decisions can alter characterization.
Preserve contemporaneous minutes and charts. Do not reconstruct FAR solely from the desired outcome.
Comparability
Review terms, markets, volume, date, currency, risks and assets. A reliable new internal comparable can change the practical hierarchy; a defective one does not compel CUP.
Document adjustments and limitations. The historical judgment does not eliminate the comparability burden.
Data and reproducibility
Map the ledger, invoices, contracts, systems and segmentation. Preserve source files, formulas and a dictionary. A theoretically preferable method that cannot be applied reliably requires data remediation or an explicit limitation analysis.
Do not change methods to hide poor segmentation. Fix the data first.
Open audits
If the authority challenges consistency, provide the chronology, law, facts and alternatives analysis. If it challenges a change, explain the trigger and effect. Do not cite the wrong docket.
Review prior submissions. Correct a misattribution in a controlled way before it affects credibility.
Litigation and citations
Legal counsel verifies official source, locator, paragraph, status, validity and relevance. A citation should present facts and limits, not only a favorable phrase.
Search for contrary or later criteria. The analysis explains whether the historical rule is comparable with current law.
Intercompany policy
The policy can require annual review without automatically changing methods. Define owners, information, thresholds and approval. Include transition and adjustment procedures.
Avoid “TNMM will always be used.” Prefer a rationale subject to facts and reassessment.
Change governance
Tax proposes; operations confirms facts; accounting validates data; legal reviews contracts and precedents; management approves impact. Record the decision and date.
A change of adviser is not an economic event by itself. Require an independent technical memorandum.
Documentation effects
Update the study, local file, returns, contracts and manuals. Reconcile before-and-after outcomes. Explain any year-end adjustment and accounting effect.
Do not leave two documents for the same year using incompatible methods without an explicit bridge.
Double-tax effects
If jurisdictions prefer different methods, model the range of outcomes and adjustment risk. Assess APA or MAP depending on stage. Global consistency requires a common narrative.
A Mexican judgment does not bind the foreign authority merely because the group cites it.
Source checklist
Confirm docket, court, date, document, version, subject, provisions, facts, rule, status, votes, publication, paragraph and limits. Save the link and access date.
When a secondary source assigns the proposition to another case, return to official text before publishing or citing.
Method checklist
Confirm delineated transaction, FAR, alternatives, data, comparability, tested party, indicator, range, adjustments, history, change, approval and documentary consistency.
A correct source does not cure an incomplete economic analysis.
Illustrative example
A company used TNMM for five years and gains a reliable internal CUP after contracts change. It does not claim that history permits ignoring the CUP or that the judgment automatically requires CUP. It compares data, conditions and adjustments, documents the change and tests both results.
The memorandum cites AR 461/2007 only for the immutability argument, in context, and not AR 293/2025.
Correcting an editorial citation
Record prior text, attributed source, correct source, date, impact and reviewer. Update the article and derivative materials. If the correction changes advice, notify recipients.
Transparency strengthens authority. Concealing the mistake spreads it.
Executive approval
Before a methodology change, management receives a one-page decision record covering facts, law, alternatives, source verification, financial effect, double-tax risk, implementation and review date. Legal confirms that judicial language is not overstated.
This gate prevents a citation correction from being mistaken for the economic conclusion itself. The method still depends on the transaction.
Propagation audit
A wrong attribution rarely remains in one article. Search for the docket in presentations, proposals, studies, memoranda, policies, model email and audit responses. Classify each occurrence by exposure: internal, client, authority or court. Correct first the documents that can affect a decision or deadline.
Do not mechanically replace “293/2025” with “461/2007.” Confirm that the proposition, historical rule and facts actually support the argument. In some documents, the better correction is to remove the case citation and support method selection only with current Mexican law and economic analysis.
Keep a record of recipients of the prior version and the remediation. If a submission has already been filed, legal counsel decides whether clarification is appropriate and how to avoid another inconsistency.
Method-transition protocol
When annual review recommends a method change, execute a controlled transition. Freeze the earlier files and conclusion. Document the trigger, test alternatives against the same data population, quantify the difference and identify effects on contracts, invoicing, adjustments, returns and the foreign counterparty.
Define the first applicable date and treatment of comparative periods. The new study explains why reliability improves; it does not pretend the prior approach never existed. If an APA, audit or litigation is open, obtain legal review before implementation.
Committee and board questions
The committee asks which fact changed, which statute governs, which judicial source was verified, how much the result changes, whether double taxation may arise and which systems need modification. It also sees the rejected alternatives and reasons.
The board needs a traceable decision rather than a case-law lecture. Present the conclusion, financial range, residual risk, owners and next review. State expressly that the historical judgment does not validate the selected method by itself.
Archive the approved record with the study and source copies so the next annual review begins from verified evidence.
Conclusion
The historical-method proposition exists, but correct attribution matters. AR 293/2025 is not the transfer pricing source described; AR 461/2007 contains the relevant reasoning under an older framework.
For current decisions, the message is disciplinary: no method is retained or changed solely by habit or judicial headline. The company applies current law, analyzes facts and preserves selection evidence.
Request a Methodology Precedent Review to verify the official source and assess how the actually applicable reasoning affects method, policy, audit or litigation.
Verified official sources
- Mexico Supreme Court, official draft of amparo review 293/2025.
- Mexico Supreme Court, final transcript of the January 8, 2026 session.
- Mexico Supreme Court, judgment in amparo review 461/2007.
- Federal Judicial Weekly, decision record related to the proposition.
- Mexican Chamber of Deputies, current Income Tax Law.
Verification closed on August 2, 2026. Check official status and applicable text before using any of these documents in a controversy.