Executive Report: Tax, Customs & Financial Regulatory Developments in Mexico | October 26–31, 2026

Reporting Period: October 26–31, 2026

Welcome to the threshold between two worlds: one where tax obligations never rest, and another where the Day of the Dead reminds us that even the SAT can reach taxpayers from beyond the grave. During the week of October 26–31, 2026, Mexico’s tax, customs, and financial regulatory landscape underwent significant changes that no tax professional can afford to overlook.

Highest-Impact Development

Senate Approves 2027 Tax Reforms: Income Tax, Federal Duties Law, and Federal Revenue Law

The week’s most significant development took place during the Plenary Session of the Mexican Senate on October 27, 2026, when three legislative instruments establishing the tax framework for fiscal year 2027 were approved simultaneously. With projected government revenue of MXN 10.6 trillion, these reforms have a direct impact on tax planning for both businesses and individuals.

2027 Federal Revenue Law

• Total projected revenue: MXN 10.636 trillion.
• Projected income tax (ISR) revenue: MXN 3.289 trillion.
• VAT revenue: MXN 1.768 trillion.
• IEPS revenue: MXN 828 billion.
• Authorizes net domestic borrowing of MXN 1.7 trillion.

Amendments to the Mexican Income Tax Law (LISR)

• Expanded RESICO eligibility: Individuals with annual income of up to MXN 5 million will pay a fixed ISR amount of MXN 125,000; the annual revenue threshold for legal entities increases from MXN 35 million to MXN 50 million.
• The agricultural and livestock income exemption increases from MXN 900,000 to MXN 1 million.
• New limitations on deductions and tax loss carryforwards are introduced to combat tax evasion.

Federal Duties Law (Ley Federal de Derechos)

Updates to fees applicable to immigration, consular services, telecommunications, airspace, railways, and environmental matters.

Additional measures include:

• Exemption from Sunday admission fees at protected natural areas.
• Allocation of 15% of immigration duties to the National Migration Institute (INM).
• Allocation of 57% to the Ministry of National Defense (SEDENA).

The LISR reform was returned to the Chamber of Deputies with amendments to Article 78-E concerning the automotive sector. The revised bill should be closely monitored as it returns to the lower chamber.

2026 Miscellaneous Tax Resolution (RMF): Fourth Advance Version of the Fourth Amendment

Published on the SAT website on October 29, 2026, this advance version introduces changes to Chapter 11.4, governing the El Buen Fin raffle, the diesel tax incentive, and three key RMF annexes.

The amendments will enter into force on the day following their publication in the DOF.

El Buen Fin Raffle — Chapter 11.4

The regulations implementing the tax incentive decree for electronic payments have been updated.

Participating entities may credit the incentive against their own income tax (ISR) or tax withheld, once the SAT has notified them of the approved amount through the Tax Mailbox (Buzón Tributario).

The incentive corresponds to the amounts paid into winning accounts, plus the government revenues (aprovechamientos) remitted to the Ministry of the Interior (SEGOB).

The amendments also regulate:

• Permanent fund offsets with state governments.
• Notification procedures concerning unclaimed prizes.

Diesel Tax Incentive — Rule 11.7.3

Four new sections have been incorporated into the calculation of the diesel reference price:

Amendments to RMF Annexes

• Second Amendment to Annex 1.
• Third Amendment to Annex 2, including updated forms related to the El Buen Fin raffle.
• Fourteenth Amendment to Annex 15.

SAT on the Move: 34 Mobile Offices Across 21 States and El Buen Fin 2026 Raffle

Mobile Service Campaign — October 26–30

With a target of serving 5,084 individuals across 32 municipalities, the SAT deployed 34 mobile offices in 21 Mexican states.

No appointment is required. Available services include:

• Federal Taxpayer Registry (RFC) registration.
• Issuance and renewal of the Mexican electronic signature (e.firma).
• Tax Status Certificate (CSF) issuance.
• General tax guidance.

Operating hours:

• Monday through Thursday: 9:00 a.m.–5:00 p.m.
• Friday: 9:00 a.m.–3:00 p.m.

Participating states: Baja California, Jalisco, Puebla, Tamaulipas, Veracruz, Chihuahua, State of Mexico, Morelos, Oaxaca, Quintana Roo, Chiapas, Mexico City, Michoacán, San Luis Potosí, Sinaloa, Baja California Sur, Nayarit, Querétaro, Guanajuato, Guerrero, and Sonora.

El Buen Fin 2026 Raffle — 14th Edition

• Total prize pool for consumers: MXN $500 million.
• Grand prize: MXN $250,000.
• Total prizes available: More than 321,260.
• Minimum purchase: MXN $250 using a credit or debit card at participating establishments.
• Raffle date: December 4, 2026, at 12:00 p.m., at SAT headquarters.
• Live broadcast: @satmx on YouTube.

Participating merchants:

• Prize pool: MXN $100 million.
• Grand prize: MXN $260,000.

Eligibility requirements: Active RFC registration, enabled Tax Mailbox, positive tax compliance opinion, and an active point-of-sale terminal (POS).

Registration deadline: November 12, 2026, through elbuenfin.org.

Federal Revenue Collection: Third Quarter 2026 and Banking Sector Resilience (ABM)

Federal Government Revenue — Q3 2026

As of the third quarter of 2026, Mexican federal government revenue reached MXN 4.813 trillion, representing a nominal increase of MXN 180.310 billion compared with the same period in 2025.

Tax revenue totaled MXN 4.292 trillion, an increase of MXN 185.313 billion.

Key tax revenue categories:

• ISR: Trillions of pesos collected.
• VAT: Trillions of pesos collected.
• IEPS: Billions of pesos collected.

Mexican Banking Association (ABM) — Mexico Pays Digitally and Banking Sector Resilience

The Mexican Banking Association (ABM) presented its Mexico Pays Digitally initiative, promoting the use of electronic payment methods and greater financial inclusion.

The Mexican banking sector continues to demonstrate historically strong fundamentals:

• ICAP — Capitalization Ratio: Twice the regulatory minimum.
• Asset Quality: Non-performing loan ratio (IMOR) remains low.
• Liquidity: Strong Liquidity Coverage Ratio.

Credit extended to the private sector reached MXN 7.7 trillion, representing nominal growth of 9.3% and an all-time high.

Judicial Weekly Publication: Two Relevant Precedents for the Tax Community

Precedent P./J. 216/2026 (12a.) — SCJN Plenary | Binding as of November 3, 2026

Provisional injunctive relief DENIED against the obligation requiring customs brokers to annually disclose changes in their financial position and assets, pursuant to Article 160, Section XII, of the Customs Law, Rule 1.4.15, and Filing Form 150/LA.

The SCJN Plenary unanimously ruled, by eight votes, that granting the requested provisional suspension would adversely affect the public interest by preventing the authorities from obtaining financial information necessary to prevent and detect transactions involving resources of illicit origin.

The collective public interest prevails over the individual benefit of the customs broker.

Mandatory application begins November 3, 2026.

Precedent I.9o.C.1 C (12a.) — Non-Binding Judicial Criterion | Ninth Collegiate Civil Court, First Circuit

Leases and Succession: Possession arising from a lease agreement is NOT a strictly personal right that terminates upon the tenant’s death.

In compliance with an amparo judgment, possession must be restored to the estate through its executor (albacea).

The tenant’s death does not cure the constitutional defect arising from an unlawful eviction, nor does it create a legal impossibility to comply with the amparo ruling.

Customs & Foreign Trade: A Week of Key Resolutions

Suspension PVC Imports — Antidumping Duty (DOF, October 28)

Final resolution of the antidumping investigation concerning imports of suspension-grade PVC from the United States.

• Definitive countervailing duty: USD 0.3918/kg.
• Oxy Vinyls: Dumping margin of USD 0.72/kg.
• Westlake: Dumping margin of USD 0.59/kg.
• U.S. share of the domestic market: 57.7%–58.5%.

Import prices fell by 49%, while domestic industry prices declined by 50%.

The domestic industry’s operating margin deteriorated from +16.3% to -28.1%.

MARINA–ANAM Cooperation Agreement (October 28)

The Ministry of the Navy (MARINA) and the National Customs Agency of Mexico (ANAM) signed a Framework Interinstitutional Cooperation Agreement aimed at:

• Improving risk analysis related to national security.
• Facilitating foreign trade.
• Strengthening customs controls.
• Exchanging technical and operational capabilities.

Prior Import Permits — Automotive Industry (DOF, October 29)

Rule 2.2.4 and Annex 2.2.1 of the Foreign Trade Rules Agreement were amended to subject goods classified under tariff item 9803.00.01 (parts and components for automotive assembly) to a prior import permit requirement when imported under the definitive import regime or placed under a bonded warehouse regime (depósito fiscal).

A favorable opinion from the General Directorate of Automotive and Transport Industry (DGIPAT) is required.

Rule 8 — Steel Grinding Balls for the Mining Industry (DOF, October 30)

Criterion VI of Annex 2.2.2 was expanded to include definitive imports of steel bars classified under tariff items 7228.30.01 and 7228.30.99, intended for the manufacture of steel grinding balls for mining operations under tariff item 7326.11.03, pursuant to Rule 8.

Important: SNICE extended the applicability of this measure until further notice, through a communication issued on October 30, 2026.

Other Relevant Regulatory Developments

SAT Updates Customs Entry Number Catalog c_NumPedimentoAduana — CFDI Version 4.0 (October 29)

The SAT added two new records to the customs entry number catalog used in CFDI version 4.0, effective October 30, 2026:

No changes were made to the CFDI XSD schemas.

Companies conducting foreign trade operations should update their invoicing systems and ERP platforms to incorporate these records and ensure that electronic invoice validation and stamping controls remain synchronized.

Mexican Institute of Industrial Property (IMPI) — New Form IMPI-00-007 (DOF, October 28)

A single unified form was approved for seven procedures related to appellations of origin and geographical indications, together with additional sheets J, K, L, M, N, and Q.

Response deadlines:

• Six months for declarations of protection.
• 45 business days for accreditation of certification bodies.
• 30 days for authorizations to use protected designations.

Ministry of Economy — Mobile Service Unit for MSMEs (October 27)

Secretary Marcelo Ebrard presented the Mobile Service Unit for Micro, Small, and Medium-Sized Enterprises (MSMEs), beginning operations in the Iztapalapa borough of Mexico City.

Currently, 63% of Ministry of Economy procedures are handled digitally, while the remaining 37% require in-person assistance.

Available services include:

• Made in Mexico certification.
• Unified Registry of Movable Property Security Interests (RUG).
• Authorization of corporate names and business names.
• Mexican Business Information System (SIEM).

The initiative will be extended to Azcapotzalco, Gustavo A. Madero, the State of Mexico, Puebla, and Morelos.

PRODECON — Taxpayer Success Stories

• Case 1: Release of a pensioner’s bank account frozen by the SAT due to outstanding income tax liabilities involving incomplete installment payments.
• Case 2: Recovery of three 2020 income tax refunds amounting to MXN $91,155, MXN $26,870, and MXN $5,285, obtained before the right to claim the refunds became time-barred.
• Case 3: Correction of an incorrect date of birth in the RFC, which had remained on record since 2013, validated through an updated Tax Status Certificate (CSF).

Executive Closing

Conclusions and Action Items — Week of October 26–31, 2026

This week brought significant changes to Mexico’s tax and regulatory landscape. The following actions deserve immediate attention:

1. Monitor the LISR Reform Returned to the Chamber of Deputies

The amendment to Article 78-E concerning the automotive sector requires close monitoring as the bill returns to the Chamber of Deputies.

The new mechanism governing deductions and tax loss carryforwards affects 318,000 companies that reported zero income tax payable.

2. Review CFDI Catalogs and Foreign Trade Permits

Update the c_NumPedimentoAduana catalogs across all invoicing systems.

Automotive companies should begin the process of obtaining the prior import permit from DGIPAT for goods classified under tariff item 9803.00.01.

3. Incorporate Precedent P./J. 216/2026 into Customs Legal Strategies

As of November 3, 2026, this binding judicial precedent establishes that provisional injunctive relief is not available against the obligation requiring customs brokers to disclose their changes in financial position and assets.

Review and adjust any ongoing amparo strategies accordingly.

4. Assess the Impact of the Suspension PVC Antidumping Duty

Importers of suspension-grade PVC from the United States should quantify the impact of the USD 0.3918/kg duty and review the procedures for substantiating applicable exclusions, including plastisol and off-specification resin, through laboratory testing and Certificates of Analysis (CoAs).

5. Plan Participation in El Buen Fin 2026

Merchants have until November 12 to register through elbuenfin.org.

Verify that the RFC is active, the Tax Mailbox is enabled, the tax compliance opinion is positive, and the POS terminal is active.

The tax incentive may be credited against the merchant’s own income tax or tax withheld.

The Tax Professional’s Day of the Dead Calaverita

A poetic tribute to the brave warriors of the SAT

La Catrina arrived with claws made of steel,

Carrying an official notice, sealed with zeal.

“Dear Taxpayer,” the letter declared,

“The SAT invites you to a dance, if you dare.”

The invitation arrived in the dead of night,

With RMF rules and a list of fright.

The tax professional turned pale as a bone,

When faced with a five-year audit to own.

The audit came dressed as an angel of light,

With documents, requests, and questions in sight:

“Where are your CFDIs? Did you burn them away?”

And SAT’s enforcement powers were suddenly in play.

RESICO appeared like a witch with a spell,

Promising a simpler life, all was well.

But the Tax Mailbox forgives not a day:

“You have twenty days!” it shouted away.

Tax losses wandered like spirits in flight,

Pursued by the SAT both day and night.

“318,000 companies with no ISR to pay?

Even the Devil won’t accept that today!”

The customs broker trembled alone in his room,

Knowing his assets were now under scrutiny’s gloom.

The Court declared: “No suspension, my friend,

Your asset disclosures must proceed to the end.”

Then El Buen Fin raffle arrived with delight,

MXN $250,000 for a lucky shopper that night.

But only at stores with an active POS,

And a positive tax opinion — no exceptions, no less!

So rest, brave tax professionals, fearless and true,

Who face the SAT’s surprises in all that they do.

May your offering be an extension, long and fair,

And may PRODECON always be there to care!

— La Catrina Fiscal, Day of the Dead 2026 🌸💀🌸

A Few Things That Never Rest…

RMF & Rules

Always changing, never resting.

Tax Requests

They follow you beyond the grave.

Tax Audits

The SAT always comes back.

PRODECON

Your tax guardian angel.