NIS B-1

NIS B-1 is the Mexican Sustainability Reporting Standard (Norma de Información de Sostenibilidad B-1) that establishes the criteria for identifying, determining and disclosing the 30 Basic Sustainability Indicators, known by their Spanish acronym IBSO (Indicadores Básicos de Sostenibilidad). It was issued by the Mexican Financial Reporting and Sustainability Standards Board (CINIF) on 13 May 2024 and took effect on 1 January 2025.

Together with NIS A-1 (the conceptual framework), NIS B-1 forms the first set of Mexican Sustainability Reporting Standards (NIS). While NIS A-1 defines the principles and qualitative characteristics that sustainability information must meet, NIS B-1 sets out the concrete indicators that entities must measure and report.

Who must apply NIS B-1?

NIS B-1 applies to all entities that prepare their financial statements under Mexican Financial Reporting Standards (NIF), regardless of their size, sector or perceived relevance of the topic. In practice, this covers the great majority of private companies in Mexico. The first mandatory reporting period covers the 2025 financial year, with disclosures published alongside the 2026 financial statements.

The 30 Basic Sustainability Indicators (IBSO)

NIS B-1 introduces 30 IBSO that must be disclosed in full: 21 are quantitative (numerical values) and 9 are qualitative (descriptive). They are grouped into three areas, environmental, social and governance, mirroring the structure of ESG reporting:

• Environmental (16 indicators): greenhouse gas emissions for Scope 1, Scope 2 and Scope 3; energy consumption and renewable energy use; sustainable investment; water withdrawal, reuse and wastewater discharge; water taken from water-stressed areas; land use near biodiversity-sensitive areas; dependence on ozone-depleting substances; and generated, recovered and hazardous waste.
• Social and human capital (6 indicators): wage gap, training hours, performance evaluation and professional development, workplace accidents and illnesses, equal-opportunity management and occupational health and safety management.
• Governance (8 indicators): women on the board, board of directors, independent oversight body, risk management policy, sustainability strategy, code of integrity and ethics, information security, and protection and privacy of third-party data.

Disclosure requirements

For each quantitative IBSO, the entity must determine and disclose both the absolute value and a relative value, so that companies of different sizes can be compared on a like-for-like basis. Entities must also report at least: their profile and operating context, the reporting period, comparable information from the prior year, their economic sector and activities, the geographic regions where they operate, and their workforce broken down by occupation, gender and age.

IBSO disclosures are presented in the notes to the financial statements at the end of the reporting period. As a transitional relief, in the first year of application entities are not required to present comparative information from prior periods, and Scope 3 emissions are not required during the fiscal year following 1 January 2025.

NIS B-1 and international standards

The NIS were developed in line with the United Nations Sustainable Development Goals and the first international sustainability standards, IFRS S1 and IFRS S2, issued by the ISSB. This alignment helps Mexican companies that also report internationally and reduces duplication of effort. The 30 IBSO are described in more detail in our entry on the 30 Basic Sustainability Indicators.

Why NIS B-1 matters

By standardising what companies disclose, NIS B-1 makes sustainability information more comparable, reliable and useful for investors, regulators and stakeholders. For companies, the main challenge is building the data systems needed to measure indicators such as GHG emissions, water and waste accurately and consistently, especially in the first reporting cycles.

At Manglai we help companies measure their carbon footprint, structure their environmental data and prepare their sustainability reporting under frameworks such as the NIS. Discover how Manglai can help you.