Transfer Pricing in Mexico

The legal framework

Transfer pricing in Mexico is administered by the Servicio de Administración Tributaria (SAT), the federal tax administration constituted as an órgano desconcentrado — a deconcentrated unit, not a legally separate entity — of the Secretaría de Hacienda y Crédito Público. Multinational groups are supervised by SAT's Administración General de Grandes Contribuyentes; rulings and advance pricing agreements are handled by the Administración Central de Fiscalización de Precios de Transferencia.

The substantive rules sit in the Ley del Impuesto sobre la Renta (LISR). Article 179 carries the arm's length obligation, the comparability factors and the related-party definition. Article 180 sets out the methods. Articles 181 and 182 govern the maquiladora regime, and article 76 fractions IX, X and XII, with article 76-A, carry documentation and reporting. Audit powers, limitation and penalties come from the Código Fiscal de la Federación (CFF). Article 302 of the LISR Regulations prescribes the interquartile calculation, and chapter 3.9 of SAT's annual Resolución Miscelánea Fiscal supplies the operating detail, including the adjustment rules at 3.9.1.1 to 3.9.1.5.

Article 179 obliges taxpayers dealing with related parties to determine taxable income and authorised deductions using the prices, consideration or margins independent parties would have used in comparable dealings; if they do not, SAT may determine those amounts itself. Article 76 fraction XII applies the same discipline to wholly domestic related-party transactions, a point foreign-headquartered groups regularly overlook. Relatedness turns on direct or indirect participation in management, control or capital, and a permanent establishment is treated as related to its head office and to that office's other establishments and related parties. Transactions with entities in a preferential tax regime carry a rebuttable presumption of both relatedness and non-arm's-length pricing, an evidential reversal better planned around than discovered on audit.

The final paragraph of article 179 gives the OECD Transfer Pricing Guidelines an express interpretive role: the 1995 Guidelines, or those replacing them, apply so far as they are consistent with the LISR and Mexico's treaties. Because the reference is dynamic, the current edition governs. The architecture matters more than the doctrine. Mexico has no domestic chapters on comparability, intangibles, services, cost contribution arrangements or financial transactions, so Chapters III, VI, VII, VIII and X operate as Mexican law only through that cross-reference. On profit attribution Mexico declines the Authorised OECD Approach across its network of roughly 60 treaties, attributing instead the profit a distinct and separate enterprise dealing independently with its head office would earn.

Methods, comparables and benchmarking

Article 180 offers six methods: comparable uncontrolled price, resale price, cost plus, profit split, residual profit split and transactional net margin. Mexico is unusual in preserving a statutory hierarchy on top of the most-appropriate-method idea. Under the third paragraph of article 180, CUP must be applied first, and the remaining methods only where CUP is not appropriate to test the transaction. Mexico defends this to the OECD as compatible with the Guidelines because an applicability test is run for each method under paragraph 2.2. In practice the hierarchy converts into a documentation duty: a local file that arrives at TNMM without recording, transaction by transaction, why no internal or external CUP was available begins the audit from a weak position.

Where two or more comparables are identified, the second paragraph of article 180 requires the resulting range to be adjusted — by the interquartile method in article 302 of the Regulations, which is the default and the near-universal practice, or by a range method agreed under a treaty mutual agreement procedure, or by a method authorised in SAT general rules. A result inside the adjusted range is accepted; a result outside it is deemed to be the median, so the cost of falling out is not the nearest quartile but the middle. SAT also maintains a non-binding criterion, 40/ISR/NV in Annex 3 of the Miscellaneous Regulations, treating the adjustment of an already in-range result as an improper practice where the effect erodes the Mexican base. Free choice of a point within the range should not be assumed.

Mexico prefers domestic comparables in principle but concedes the pool is shallow, and benchmarking is in practice built on North American, largely United States, company sets, with comparability adjustments required under article 179 wherever a material difference can reasonably be eliminated. Since the 2022 reform the comparable data must relate to the same fiscal year as the tested transaction, multi-year information being reserved for genuine business cycles, which removes the routine three-year average. Neither the LISR nor the Regulations prescribe the tested party; practice puts the Mexican entity in that role, and SAT expects a Mexico-specific functional analysis rather than a translated global study.

Documentation: what SAT expects

Article 76 fraction IX requires contemporaneous evidence that related-party dealings were arm's length: the identity, residence and ownership links of the counterparties, the functions performed, assets used and risks assumed, comparables information by transaction type, and the article 180 method applied. Taxpayers below MXN 13,000,000 of prior-year business income, or MXN 3,000,000 of professional service income, are exempt, unless they deal with preferential-regime entities or hold hydrocarbons contracts or assignations.

The three-tier package under article 76-A applies to the larger populations identified in CFF articles 32-A and 32-H: companies over the income threshold or listed, group-regime companies, state-owned entities, foreign entities with a Mexican permanent establishment, and related parties of taxpayers filing a statutory audit report. That income threshold is indexed each January and stands at MXN 1,103,204,520 from 1 January 2026, against MXN 1,062,919,860 for FY2025. The country-by-country report has its own trigger, MXN 12,000,000,000 of consolidated group revenue for a Mexican ultimate parent or designated reporting entity, and where a foreign parent designates a Mexican entity as reporting entity the notice to SAT is due by 31 December of the year following the designation.

The calendar then splits. The local file, fraction II of article 76-A, is due by 15 May of the following year and must be in Spanish. The master file under fraction I and the CbC report under fraction III are due by 31 December, with the master file permitted in English under rule 3.9.15. The separate related-party informative return, DIM Annex 9 under article 76 fraction X, is also due by 15 May and since 2022 covers domestic as well as foreign related parties; the ISSIF accompanies the annual return, and dictamen filers report through SIPRED by 15 May. The OECD profile's 31 March date for that return is out of date. Adjustments must be booked before the year closes so that tax and accounting reconcile, and disclosed on Form 76 under CFF article 31-A.

Audits, penalties and the enforcement climate

CFF article 53 sets the clock. Books demanded during a visit must be produced immediately, six days for documents that should be at the premises, and fifteen days otherwise, which is the period applied to transfer pricing studies, extendable by ten days on a written request made in time. A field audit or desk review normally runs twelve months, eighteen for financial-sector and group-regime taxpayers, and up to twenty-four where SAT requests information from a foreign administration, which is common in multinational cases. Assessment powers lapse after five years, ten where returns or records are missing.

Penalty amounts are re-indexed each January through Annex 5 of the Miscellaneous Regulations, and the figures in the OECD profile are already superseded. From 1 January 2026, failing to file the article 76-A returns, or filing them incomplete or inconsistent, costs MXN 226,000 to MXN 321,770 per return; the related-party informative return attracts MXN 112,750 to MXN 225,500; and related-party transactions not identified in the accounts attract MXN 2,560 to MXN 7,680 each. Non-filers are additionally barred from public-sector contracting under CFF article 32-D.

On the assessment itself CFF article 76 imposes 55% to 75% of omitted tax and 30% to 40% of an overstated loss, rising to 60% to 80% for integrating and integrated companies in the optional group regime, with a 20% reduction where the omitted contributions and their accessories are paid within 45 days of the assessment taking effect. There is no longer any transfer pricing penalty protection: the paragraph that halved the fine where the omission arose from the arm's length obligations and the taxpayer had met its documentation duties was repealed by the decree published on 12 November 2021, with effect from 1 January 2022, and nothing equivalent appears in the Code in force. A genuinely contemporaneous study now buys audit position and negotiating room, not a discount. SAT's Plan Maestro de Fiscalización 2026 selects cases using analytics and machine learning, targeting recurring losses and below-sector effective rates, and intercompany audits now test substance rather than the existence of a report.

Dispute resolution and advance certainty

Advance pricing agreements rest on CFF article 34-A, which lets SAT rule on the methodology for related-party pricing. A unilateral resolution can cover the year of the request, the immediately preceding year and the three following years, and SAT may attach conditions demonstrating that the covered dealings are genuinely at arm's length. Bilateral and multilateral agreements are available and may run longer where they follow a competent authority procedure. A federal duty applies: article 53-G of the Ley Federal de Derechos sets it at MXN 336,624.17, subject to periodic updating. Mexico offers no cooperative compliance programme and does not participate in ICAP.

Mutual agreement procedure is the only route to a corresponding adjustment, since unilateral downward adjustments are unavailable. Where a primary adjustment is followed by a further charge, rule 3.9.1.1 characterises the secondary adjustment as a deemed dividend, with the withholding consequences that follow under articles 140 and 164.

Domestically, the conclusive agreement under CFF articles 69-C to 69-H is the workhorse. Mediated by the taxpayer ombudsman PRODECON before SAT finalises its determination, it allows the facts and the pricing analysis to be negotiated, and article 69-G gives a first-time signatory a full penalty reduction — now the principal penalty relief left in transfer pricing cases. Beyond that lie the recurso de revocación, the Tribunal Federal de Justicia Administrativa and amparo. The constitutional challenge to article 76-A itself failed, the courts holding that the obliged taxpayers, the information and the deadlines are identifiable from the statute; everyday disputes are won and lost on comparability, functional characterisation and the sufficiency of evidence.

Pillar Two, Amount B and what changes in 2026

Mexico has not enacted the GloBE rules. As at August 2026 there is no income inclusion rule and no qualified domestic minimum top-up tax; the 2026 economic package published on 7 November 2025 amended the Federal Tax Code, the revenue law, excise and duties, and left Pillar Two alone. The change in the United States position has visibly reduced the appetite to legislate. Inbound and Mexican-headquartered groups should still model exposure, because low-taxed Mexican profit can be topped up by rules enacted elsewhere while Mexico itself collects nothing.

Amount B remains unresolved. Mexico told the OECD in July 2025 that the simplified and streamlined approach would arrive by secondary regulation in the second half of that year; it did not. SAT reported in June 2026 that the legal framework is still under review, and identified roughly 300 potentially in-scope companies, mainly wholesale distributors of tangible goods. Mexico has nonetheless committed to respect Amount B outcomes applied by other jurisdictions, whether covered or not, which matters to Mexican entities on the counterparty side of a distributor's return.

For maquiladoras the position hardened first and is now softening. The 2022 tax reform decree of 12 November 2021, in force from 1 January 2022, removed the APA alternative from LISR article 182, leaving the safe harbour, the greater of 6.9% of assets and 6.5% of costs and expenses, as the only domestic route from FY2025. SAT and the IRS have since continued the bilateral channel: QMA 3.0 resolves bilateral APAs for 2020 to 2024 and establishes a newly agreed Qualified Maquiladora Approach from FY2025, potentially reaching FY2029, for asset-heavy operations able to show substantial invested cost and a material divergence from the safe harbour result.

How practitioners should respond

Three habits separate clean files from expensive ones. First, build the local file as a Mexican document: a Mexico-specific functional analysis, in Spanish, filed by 15 May, not an extract of the global study. Second, record the method reasoning the statute actually demands, showing why CUP failed transaction by transaction, and gather substance evidence for services, royalties and intragroup financing as the year runs rather than when the fifteen-day notice arrives. Third, manage the range before the year closes: adjust in-year, disclose on Form 76, and price the deemed-dividend and withholding consequence of any adjustment before booking it.

Two calendar habits follow. Re-check every peso threshold and penalty band each January, because Annex 5 moves them. And choose the certainty mechanism early — with the documentation-based penalty reduction gone since 2022, the conclusive agreement while the audit is live, an APA where the operating model is stable, and MAP where relief depends on the other state are what remain.