If your company owns an industrial building, land, offices or retail space, there is a new law worth keeping on your radar. The evening edition of the Federal Official Gazette (DOF) of October 23, 2026 published the decree enacting the General Law for the Strengthening and Harmonization of Cadastres and Registries (Ley General para el Fortalecimiento y Armonización Catastral y Registral). According to media outlets that followed the publication, the decree took effect on October 24.

The law does not change who owns what, and it does not create a new tax. What it does is set rules for how properties are identified and how cadastral offices and public property registries across the country share information. For anyone who buys, sells, leases or pledges real estate as collateral, that will show up in filings, timelines and, eventually, in the assessed cadastral value on which property tax (predial) is calculated. At CounselHub we walk you through the essentials.

How we got here

The President of Mexico submitted the bill on September 8, 2026. The Chamber of Deputies approved it in general on October 6, and the Senate approved it in general and in its particulars on October 14, with the opposition voting against. The law rests on Article 73, section XXIX R, of the Mexican Constitution, and its stated purpose is to “strengthen, modernize, standardize, update and make interoperable the cadastres and the public property registries,” coordinating the federal government, the states and the municipalities.

What the law creates

  • Unique Cadastral Key: an identifier assigned to each parcel or real estate unit. Its format will be defined in technical guidelines issued by Sedatu (the federal agrarian, land and urban development ministry) and the Agency for Digital Transformation and Telecommunications.
  • Unique Cadastral and Registry Certificate: an electronic or physical document with the property's general information that links cadastral data to the real estate folio at the Public Property Registry.
  • National platforms: a National Cadastral Platform and a National Public Property Registries Platform to handle filings in a standardized, interoperable way.
  • Llave MX: the federal government's digital identity mechanism will be used to file on those platforms.
  • National plans: a National Cadastral Plan and a National Registry Plan with standards and guidelines that are mandatory for cadastral and registry authorities.

An important nuance raised since the bill was introduced: assigning a Unique Cadastral Key does not, by itself, constitute full proof of ownership, possession, surface area or boundaries, nor does it validate void or irregular acts. In other words, the key identifies the property, but it does not replace the title deed or the registry entry.

The dates that matter

Under the transitional articles of the approved bill:

  1. The Agency and Sedatu have 30 business days to issue the guidelines for the national plans, the Unique Key and the Certificate, and the Agency has the same period to launch the platforms.
  2. Cadastral and registry authorities must adopt the models and platforms no later than December 31, 2026, so they go live on January 1, 2027.
  3. State legislatures have 180 days from the effective date to amend their laws and budget the necessary resources.

In Nuevo León, public registry of property and commerce functions and cadastral functions are handled by the state's Registry and Cadastre Institute (Instituto Registral y Catastral), a decentralized agency created by state law. It will be important to watch how the state Congress aligns that framework with the general law and what operational changes the Institute introduces in the coming months.

Will property tax go up?

This is the question we hear most. The law does not set automatic increases or change property tax rates. Collection remains municipal: city councils propose rates and fees, and state legislatures approve municipal revenue laws.

That said, opposition lawmakers warned during the debate that updating cadastral values and adding properties that are not currently registered could raise what owners pay, even without touching the rate. So it pays not to get complacent: the risk is not in the general law itself, but in the value updates that states and municipalities decide on.

What it means for your company

  • Real estate purchases and sales: in an acquisition or real estate due diligence, it will be useful to confirm that surface area, measurements and boundaries match between the cadastre and the registry, since the platforms are designed precisely to cross check that information.
  • Collateral and financing: if your properties secure loans, any discrepancy between the cadastre and the real estate folio may become more visible and delay transactions.
  • Leasing and industry: for industrial parks and leased buildings, it makes sense to confirm that each property's information is up to date before signing or renewing leases.
  • 2027 budget: if the municipality updates values, property tax could change. It is worth modeling that scenario now.
CounselHub recommendation: before the platforms launch in January 2027, take an inventory of your company's properties and compare, parcel by parcel, the title deed, the Public Registry entry and the property tax bill. If you find differences in surface area, owner or land use, fix them now: cleaning things up calmly costs less than doing it once a sale, a loan or a merger is already underway.

The law is now published, but its practical effect will depend on the guidelines Sedatu and the Agency issue in the coming weeks and on how each state harmonizes its rules. At CounselHub we will follow its implementation and can help you review the legal status of your properties.