Mexico's NIS 2026: What It Is and Who Must Comply

• The NIS is the sustainability standard CINIF created for companies that prepare financial statements under NIF in Mexico. 
• It came into effect on January 1, 2025, and requires 30 indicators: 21 quantitative and 9 qualitative.
•  The first report is filed in 2026, with data from the 2025 year-end close. 
• Not trading publicly doesn't exempt you  the standard applies even if your company issues no public debt or equity. 
• It differs from the IFRS S1 and S2 that the CNBV requires of issuers, although both share their origin in the ISSB.

The NIS, Mexico’s Sustainability Information Standards issued by the Mexican Council for Financial Reporting and Sustainability Standards (CINIF), doesn’t distinguish between public and private companies. It distinguishes between who prepares financial statements under Mexican Financial Reporting Standards (NIF) and who doesn’t. If your company falls into the first group, the standard already applies to you, listed or not.

The question we get most isn’t whether it applies. It’s how ready your company is to back up, with real data, each of the 30 indicators in front of an auditor who already expects them at year end. That question has nothing to do with company size. It comes down to who has already started building the data and who is still improvising.

And the standard hasn’t stood still either. On July 15, 2026, CINIF closed the comment period on a first package of amendments to the NIS. None of it is approved yet, but we already know where it’s heading, and we cover that here too.

Before we go further, these are the questions that come up most when someone searches for NIS in Mexico: what it is exactly, who it applies to, how it differs from IFRS S1 and S2, what NIS B-1 requires, and what happens if your company isn’t publicly listed. This article answers all five, in order.

The NIS is the Mexican accounting standard that requires entities preparing financial statements under NIF to disclose 30 sustainability indicators as part of their financial notes.

CINIF published the first two standards in this series, NIS A-1 and NIS B-1, on May 13, 2024, as PwC Mexico explains. They took effect on January 1, 2025, with early adoption allowed. NIS A-1 defines the conceptual framework that is, what characteristics information must meet to be useful to whoever reads the financial statements. NIS B-1 requires disclosure of 30 Basic Sustainability Indicators, known as IBSO, grouped into three areas: environmental; social and human capital; and governance. Of that total, 21 are quantitative and 9 qualitative, and CINIF itself lists them one by one on its site.

CINIF's mandate to issue these standards didn't always exist. In May 2022, the organization's General Assembly of Associates voted to expand it to include sustainability, two years before the first standard saw the light of day. That history explains why the NIS arrives with the same technical rigor already applied to Mexico's Financial Reporting Standards, rather than as an improvised annex. 

If your company is also regulated say, by the CNBV or the National Insurance and Bonding Commission the standard doesn't act alone. It stacks on top of whatever that specific regulator requires, which can add further layers of disclosure on the same topic.

In practice, almost no one inside the company has that complete data on day one. Finance knows its financial statements but not the electricity consumption per plant. Sustainability knows its emissions, if it measures them, but not how that becomes a note reviewed by an external auditor. Procurement knows the suppliers but rarely knows which indicator depends on that relationship. The result is usually a hand-estimated IBSO, built from a number someone remembers from a past meeting. 

Without primary data, an IBSO is an estimate with an official letterhead. And the financial auditor already reads your sustainability indicators, because they sit inside the same document audited at every year-end close.

This standard matters because it stops treating sustainability as corporate communication and turns it into auditable financial information. The International Sustainability Standards Board (ISSB) published its first two standards, IFRS S1 and IFRS S2, on June 26, 2023. The CNBV adopted them as a mandatory reference for securities issuers starting with the 2026 report. The Mexican version of that same principle, applied to a much broader universe of companies, is what we're describing here.

IFRS S2 follows the four pillars of the Task Force on Climate-related Financial Disclosures (TCFD): governance, strategy, risk management, and metrics and targets. CINIF's standard inherits that same logic for the Mexican market, though with a narrower scope of indicators and without yet requiring a full financial materiality analysis.

 The CNBV went further with issuers. It amended the Circular Única de Emisoras on January 28, 2025, published in the Official Gazette of the Federation, to require a sustainability report aligned with IFRS S1 and S2. That report must come with an external assurance opinion starting with the 2026 report  first limited assurance, and from the 2027 report onward, reasonable assurance.

That difference changes who reviews your climate data. It's no longer just the Sustainability team, or Investor Relations if you trade publicly. It's the auditor who signs your financial statements at every year-end close. A well-documented NIS also feeds directly into your CDP Score, the system banks and funds use to read a company's climate risk, and that number doesn't forgive loose estimates either. 

The NIS lives in your financial statements, not in sustainability. A poorly supported IBSO isn't a communication error. It's an audit qualification, and that does change how a bank reads the rest of the document.

Advantages 

• Organizes sustainability information into a single audited document, instead of scattering it across voluntary reports with no quality control. 
• Prepares your company for the natural jump to IFRS S1 and S2 if you ever issue debt or equity on the BMV or BIVA.
•  Gives banks and investors a comparable format across companies in the same sector something that doesn't exist today with loose, voluntary reports that lack a common methodology. 
   

Disadvantages 

• Requires 30 new indicators that almost no private company measured consistently before 2025. 
• Forces coordination across areas that rarely talk to each other: Finance, Sustainability, Procurement, and Human Resources. 
• Without infrastructure to capture data at the source, every year-end close becomes a race against the audit calendar, with teams rebuilding information at the last minute and no time to review it twice.
   

The downsides aren't the standard's fault. They're an infrastructure problem. Most companies that see the NIS as a burden today don't have a problem with the standard itself  they have a problem with where their data lives and who's responsible for backing it up in front of a third party. Postponing the decision doesn't remove the obligation, it just piles it up. A company that reaches the 2026 close without having mapped its 30 indicators ends up solving in weeks what could have been built over months, and that rush shows in the quality of the data it finally hands the auditor.

The NIS and IFRS S1 and S2 share their origin in the ISSB, but they serve different universes. The former reaches any company under NIF, the latter only issuers. GRI and SASB remain voluntary frameworks that many companies use as a reference for building their indicators, though neither replaces the accounting obligation Mexico's standard now carries.

This is where most companies get stuck. It's not about understanding the standard it's about producing data of a quality an auditor will review without objections, indicator by indicator. The most common mistake is starting by buying a template or generic software before mapping what information already exists inside the operation itself.

• Step 1. Mapping the 30 IBSO against your real operation. Bono identifies which indicators already exist in some system, which can be calculated from data you already generate, and which require a new source. We don't start from zero  we start from what already lives on the plant floor, in Procurement, and in Human Resources, even if it's scattered across different areas today. 
• Step 2. Capturing the data at the source, not in a year-end spreadsheet. Bono's infrastructure connects consumption, contracts, and payroll directly to each IBSO, instead of waiting for someone to rebuild the number by hand weeks before the year-end close, when it's already too late to fix something poorly captured.
• Step 3. Audit-ready delivery, with traceability per indicator. Bono generates the documentary backup for each IBSO source, calculation method, and capture date in a format the external auditor can review without asking for additional explanations at every year-end close.

FAQ 1: Does the NIS apply to my company if I don't trade publicly?

Yes. The standard applies to any entity that prepares financial statements under NIF, whether it trades publicly or not. Trading publicly adds the extra obligation of IFRS S1 and S2 via the CNBV, but not trading publicly doesn't exempt you from CINIF's standard or its 30 indicators.

FAQ 2: What's the difference between the NIS and IFRS S1 and S2?

The NIS is issued by CINIF for companies under NIF in Mexico. IFRS S1 and S2 are issued by the ISSB, and the CNBV requires them only of securities issuers. They share philosophy and origin in the same international standard, but not the same universe of companies obligated to comply.

FAQ 3: What happens if I don't have the data for an IBSO?

The standard allows excluding certain items, such as some Scope 3 emissions as defined by the GHG Protocol, during the first year it's in effect. It's a temporary exception, not a permanent way out, and an auditor will ask about it directly at the following close.

FAQ 4: Since when do I have to report the NIS?

NIS A-1 and NIS B-1 took effect on January 1, 2025. The first report is filed in 2026, with data from the fiscal year closed December 31, 2025, and comparatively against the prior period starting with the second fiscal year.

• The NIS lives in your financial statements, not in sustainability. Treat it as a Finance matter, not a communications one. 
• Not trading publicly doesn't exempt you. Check whether you prepare financial statements under NIF. 
• An estimated IBSO today is an audit finding tomorrow. 
• Check which IBSO you can already calculate with systems you already have, before building something new from scratch. 
• Document the calculation method for each indicator from the first year-end close, not after.

Every year-end close without your IBSO integrated into a system means a longer negotiation with the auditor, an exhausted team rebuilding data in March, and a financial note a bank may read as opaque.

We'll show you your estimated score before the call ends.