The Mexico Treaty and the USMCA Overlay
Ask a Mexican business owner what governs their US tax exposure and USMCA comes up before the income tax treaty does, usually because USMCA is the agreement everyone has heard of. USMCA and the Mexico-US income tax treaty are separate instruments doing separate jobs, and confusing them leads to real mistakes, from assuming a tariff schedule has anything to say about withholding on a dividend, to assuming an income tax provision governs a customs classification. This starts by separating the two, then works through what the tax treaty actually does.
Two agreements, two subjects
The United States-Mexico-Canada Agreement, which replaced NAFTA and entered into force July 1, 2020, is a trade agreement. It governs tariff schedules, rules of origin, market access, labor and environmental standards, and dispute resolution mechanisms for trade in goods and services between the three countries. It does not contain an income tax article, it does not set a withholding rate on a dividend, interest, or royalty payment, and it does not define permanent establishment for income tax purposes. USMCA Chapter 32 in fact expressly carves taxation measures out of most of the agreement's substantive obligations, reserving tax matters to the parties' own tax treaties and domestic law except in narrowly defined areas such as certain expropriation and national treatment provisions applied to specific tax measures.
The Convention Between the Government of the United States of America and the Government of the United Mexican States for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income, signed September 18, 1992, entered into force January 1, 1994, and amended by a Protocol signed September 8, 1994 and a further Protocol signed November 26, 2002, is the instrument that governs income tax. It sets withholding rates, defines permanent establishment, allocates business profits, and contains the limitation on benefits article. A maquiladora operator, an importer relying on USMCA preferential tariff treatment, and a US company receiving a royalty from a Mexican licensee are all dealing with cross-border Mexico exposure, but only the last two are governed by the tax treaty. The maquiladora's customs and tariff position runs through USMCA and Mexican customs law, and its income tax position, including the transfer pricing safe harbor rules under the Mexican Ley del Impuesto sobre la Renta for maquiladora operations, runs through the treaty and Mexican domestic law separately.
Because Ali Gulzari's practice includes work on the trade side of Mexican operations as well as the tax side, this distinction is not academic. A client asking whether USMCA reduces withholding on a royalty paid to a Mexican affiliate is asking the tax treaty's question using the trade agreement's name, and the answer has to come from Article 12 of the 1992 convention, not from any chapter of USMCA.
Residence under the treaty
Article 4 of the treaty defines a resident of a contracting state by reference to that state's own tax liability rules based on domicile, residence, place of management, place of incorporation, or a similar criterion, and Article 4(3) supplies a tie-breaker for dual-resident companies based on place of effective management where the general rule does not resolve the question. A company organized under Mexican law and taxed on worldwide income by Mexico generally clears this threshold without difficulty.
Withholding on dividends, interest, and royalties
Articles 10, 11, and 12 of the treaty set the source-state ceilings applicable to a US recipient of Mexican-source income, and the reverse for a Mexican recipient of US-source income, subject in each direction to the treaty's limitation on benefits article.
| Income type | Treaty article | Rate structure |
|---|---|---|
| Dividends, general portfolio holding | Article 10(2)(b) | 10% |
| Dividends, company owning at least 10% of voting stock | Article 10(2)(a) | 5% |
| Interest paid to banks, insurance companies, or on publicly traded bonds and securities | Article 11(2)(a) | 10%, subject to the specific conditions in the article |
| Interest, general case not falling within a reduced category | Article 11(2)(b) | 15% |
| Interest paid to the other state's government, central bank, or specified financing institutions | Article 11(3) | 0%, subject to conditions |
| Royalties, general case | Article 12(2) | 10% |
The interest article is the one most likely to be applied incorrectly, because Article 11 does not set a single rate. It tiers the rate by the character of the payee and the instrument, and correctly categorizing the recipient, a bank, an insurance company, a holder of publicly traded debt, or an unrelated commercial lender falling outside those categories, determines which subsection applies before any rate can be quoted with confidence.
Associated enterprises and the maquiladora transfer pricing question
Article 9 of the treaty authorizes each country's tax authority to adjust the profits of a related enterprise where intercompany transactions are not conducted on arm's length terms, and Article 9(2) provides for a correlative adjustment by the other state once a primary adjustment has been agreed, avoiding double taxation of the same income. Article 26 sets out the mutual agreement procedure through which a taxpayer can bring a transfer pricing dispute to the competent authorities. This general treaty framework operates alongside, and does not replace, the specific transfer pricing safe harbor available under Mexican domestic law for maquiladora operations under the Ley del Impuesto sobre la Renta, which allows a qualifying maquiladora to satisfy its Mexican transfer pricing obligations through either a safe harbor return on assets and costs or an advance pricing agreement with the Mexican tax authority. A US principal with a Mexican maquiladora affiliate needs both analyses: the treaty's Article 9 framework for the cross-border relationship generally, and the maquiladora-specific safe harbor or APA for the Mexican domestic filing.
Permanent establishment, including construction and services
Article 5 defines permanent establishment along the general fixed place of business model, with an illustrative list covering a place of management, a branch, an office, a factory, a workshop, and a place of extraction of natural resources. The treaty's construction provision is notably shorter than the twelve-month threshold found in many US treaties. Article 5(3) treats a building site, construction, assembly, or installation project, or supervisory activities connected with it, as a permanent establishment where the site, project, or activities continue for more than six months. This shorter threshold reflects the volume of shorter-duration construction and installation work that crosses the border in both directions, and it means a US contractor active on a Mexican project needs to track duration against a six-month clock, not the twelve-month clock that applies under several other US treaties.
Article 5(3) also addresses services performed through employees or other personnel, treating the furnishing of services, including consultancy services, as creating a permanent establishment where those activities continue, for the same or a connected project, for a period or periods aggregating more than six months within any twelve-month period. As with the construction rule, this is a duration test rather than a fixed-office test, and it applies independently of whether the service provider has any physical location in the other country.
Article 7 defines business profits and generally follows the arm's length, separate-enterprise approach used across the US treaty network, attributing to the permanent establishment the profits it would have earned had it been a distinct enterprise dealing independently with the rest of the company. Only profits attributable to the permanent establishment under this framework are taxable by the state in which it is located.
Article 13 addresses gains from the alienation of property, and it follows the same general pattern as most US treaties in this area. Gains on real property situated in a contracting state are taxable by that state, and gains on shares or comparable interests deriving their value principally from real property situated there receive the same treatment. This runs alongside, rather than in place of, the US domestic FIRPTA rules under IRC §897 and the associated withholding obligation under IRC §1445, so a Mexican holder of US real estate, or of an interest in a company holding US real property, should not expect the treaty to reduce that withholding. Gains on property forming part of the business assets of a permanent establishment are taxed under the same allocation principle as Article 7, and gains not otherwise addressed are generally taxable only in the alienator's state of residence.
The limitation on benefits article
Article 17 of the treaty is the limitation on benefits article, added by the 1992 convention and refined by the subsequent protocols. It follows the qualified person architecture common to the US treaty network: a publicly traded test, an ownership and base erosion test requiring that a specified percentage of the entity be owned by qualifying residents and that deductible payments to non-qualifying third parties stay below a base erosion threshold, and an active trade or business test available on an item-by-item basis for income connected to an active trade or business carried on in the residence state. A closely held Mexican operating company owned by Mexican resident individuals with a genuine Mexican business generally has a workable path through one of these tests, but a holding structure layered with non-Mexican, non-US ownership, or one whose Mexican entity exists mainly to receive and pass through US-source payments, is exactly the fact pattern Article 17 is built to catch, and it deserves review against the article's specific ownership and base erosion percentages rather than an assumption of qualification.
What USMCA does and does not add
Returning to the trade agreement with the tax treaty now on the table: USMCA's relevance to a cross-border Mexican operation is real but bounded. It determines whether a good qualifies for preferential tariff treatment under its rules of origin, it sets standards for customs procedures and trade facilitation, and it establishes labor value content requirements relevant to automotive and certain other sectors. None of that changes the withholding rate on a dividend paid by a Mexican subsidiary to its US parent, none of it changes whether a US services provider has crossed the six-month threshold in Article 5(3) of the tax treaty, and none of it substitutes for the transfer pricing documentation a related-party cross-border transaction requires under both countries' domestic law. A business that has confirmed its USMCA origin qualification for tariff purposes has not thereby confirmed anything about its income tax position, and the two analyses need to be run separately, by the people equipped to run each one.
Documentation
A Mexican payee certifies treaty entitlement to a US withholding agent on Form W-8BEN for an individual or Form W-8BEN-E for an entity. A US filer taking a return position based on the treaty that is inconsistent with the Code generally discloses that position on Form 8833 under IRC §6114, subject to the routine-claim exceptions for withholding-agent-reported reduced rates. Where a maquiladora or other Mexican operating structure is involved, the treaty documentation runs alongside, and separately from, the customs and trade compliance documentation required to sustain USMCA preferential treatment, and the two files should not be treated as interchangeable evidence of the other.
What this does not resolve
Nothing here determines whether a specific services engagement has crossed the six-month threshold in Article 5(3), whether a given ownership structure clears Article 17, or whether a particular product qualifies for USMCA preferential tariff treatment. This is general information about how the tax treaty and the trade agreement operate as of the date written, and it does not substitute for a review of the specific facts. Questions about origin determinations and tariff classification belong with a customs professional, and questions about the legal scope of a specific treaty position belong with counsel who can review the ownership chain and the underlying transaction directly.