SASB vs ISSB: What companies need to know

Sustainability reporting continues to evolve as global expectations rise and regulatory scrutiny increases. Two of the most influential frameworks shaping how organisations disclose sustainability information were developed by the Sustainability Accounting Standards Board (SASB) and the International Sustainability Standards Board (ISSB). Each serves a different purpose, but companies increasingly combine them for greater transparency in reporting. Understanding how these frameworks compare helps organisations choose the right reporting approach for their business.

Both frameworks sit under the IFRS Foundation umbrella, the body that sets standards in international financial reporting. Naturally, they focus on financial materiality, guiding companies to report on sustainability topics that could influence their financial performance. They help communicate risk, strategy and performance in a way that supports decision-making by investors and regulators. 

The SASB standards provide detailed guidance on industry-specific issues across over 70 industries. ISSB sets out more general principles around the approach to reporting (S1). Incorporating the Task Force on Climate-related Financial Disclosures (TCFD) supports detailed reporting on companies’ climate change adaptation and mitigation strategies. Future topic-based standards from ISSB are expected to take a similar deep-dive approach to topics including nature and workforce development..

Understanding the relationship between SASB and ISSB is becoming more important, as ISSB Standards gradually replace and expand on the earlier SASB framework. Organisations that previously relied on SASB standards will find that IFRS S1 and IFRS S2 incorporate many of the same concepts. The IFRS Foundation states that SASB can be ‘a source of guidance’ when applying IFRS S1. This makes it essential for companies to understand how to use the SASB standards as a reference when integrating the ISSB standards into reporting systems.

What the SASB standards provide

The SASB standards were created to help organisations identify sustainability topics that may influence enterprise value. These standards apply a financial materiality approach that focuses on factors most likely to affect economic outcomes, such as revenue, costs, assets, liabilities and cost of capital.

The SASB standards cover 77 industries, each with its own set of metrics and disclosure topics that link sustainability performance to financial results. SASB’s industry-specific focus helps organisations explain which sustainability issues matter for their financial performance. For example, data security is a material financial risk for technology companies, while water management is a material financial risk for agriculture and mining. This ensures companies in the same industry report on the same issues, helping investors compare performance across companies.

One of SASB’s strengths lies in the clarity of its metrics. Disclosures often include quantitative indicators that speak to operational performance and increased risk exposure. 

This level of precision supports informed investment decisions. SASB Standards help organisations answer questions about operational resilience, cost structure and business model risks in a consistent way.

What the ISSB standards provide

The ISSB Standards were designed to build on earlier frameworks and establish a global baseline for sustainability-related financial disclosures. There are two standards. IFRS S1 focuses on general sustainability-related risks and opportunities that influence enterprise value. IFRS S2 provides specific requirements for climate-related disclosures, building on the structure introduced by TCFD.

Both standards aim to provide globally consistent, comparable sustainability information. They address the growing need for reliable disclosures in capital markets, where investors expect organisations to reveal how sustainability issues affect financial prospects. The standards align closely with financial reporting principles and require companies to explain governance, strategy, risk management and performance on financially relevant sustainability matters.

The ISSB standards incorporate many concepts drawn from the SASB standards, including the industry-specific guidance developed by SASB. This integration means companies that already use the SASB standards have a strong foundation for ISSB reporting and can transition from one to the other.

How SASB and ISSB fit together

While SASB and ISSB serve similar audiences, they do so in different ways. SASB provides a detailed, industry-specific lens for assessing financially material sustainability issues. The ISSB standards establish a broader reporting framework that integrates these topics into financial reporting. Together, they create a pathway for organisations to deliver more complete and credible sustainability disclosures.

The ISSB standards encourage organisations to refer to SASB when identifying sustainability topics that influence enterprise value. This means organisations should use SASB’s detailed industry guidance to support the development of disclosures required under IFRS S1. The result is a complementary relationship where SASB serves as a practical tool within the broader ISSB reporting world.

Organisations preparing for ISSB reporting will benefit from reviewing the SASB standards as part of their analysis. Doing so helps them identify sustainability issues that matter to investors and ensures that disclosures align with sector expectations. This approach supports credible reporting and helps organisations demonstrate clear connections between sustainability performance and financial outcomes.

Why ISSB is becoming the global baseline

The ISSB standards were introduced to create consistency across jurisdictions in response to growing expectations around sustainability reporting. Regulators, stock exchanges and investors are seeking a framework that provides clear, comprehensive information aligned with financial reporting standards. 

Several jurisdictions have signalled support for ISSB. By the end of 2025, more than 30 countries had announced plans to adopt the IFRS standards as the basis for mandatory reporting, incorporating them into national legislation as is, or with only slight amendments. This includes countries across the Americas, Asia Pacific, Europe and the Middle East. As more regulators reference the ISSB standards within their disclosure requirements, sustainability reporting becomes more structured and entity-level governance must strengthen to support compliance. Check out our article, Major economies adopt the ISSB’s sustainability standards.

The global shift toward ISSB Standards does not reduce the relevance of SASB. Instead, the SASB standards remain a key resource supporting ISSB reporting. They provide detailed industry-level insights that ISSB Standards do not replicate. This connection ensures that SASB continues to be used across organisations preparing for ISSB-aligned sustainability disclosures.

Key differences companies should understand

Although SASB and ISSB align in many areas, organisations must understand the differences between them to ensure accurate reporting.

What these changes mean for reporting teams

Companies preparing for ISSB reporting will need to strengthen their internal reporting processes. This includes more rigorous data management, closer coordination between sustainability and finance teams, and more detailed documentation of assumptions, methodologies and risk assessments.

As the ISSB standards reference the SASB standards, reporting teams should evaluate their existing use of SASB and decide how to integrate these insights into their ISSB reporting plan. Companies that have never used SASB before may need to familiarise themselves with SASB’s industry guidance to identify material sustainability topics for ISSB disclosures.

Reporting teams must also consider their readiness for independent assurance, as sustainability information will increasingly be subject to external review. Disclosures should be supported by clear evidence, backed up by data and documentation on assumptions, methodologies and internal approval processes. This preparation helps ensure that sustainability reporting aligns with growing regulatory expectations.

How companies can prepare

There are several practical steps organisations can take to prepare for ISSB and SASB-aligned reporting.

• • Review SASB industry standards

Get to know the relevant  SASB standards for your industry and identify which sustainability topics could be financially material for your business. This creates a strong foundation for ISSB reporting.

• • Map SASB topics to ISSB requirements

Map existing reporting against the ISSB framework for each of the identified topics to find overlaps and gaps between existing disclosures and ISSB expectations. This process supports integration between frameworks.

• • Update governance and risk processes

ISSB Standards require organisations to explain how sustainability risks and opportunities influence governance and risk management processes. Review existing systems to ensure they are fit for future disclosure requirements.

• • Strengthen data quality controls

Revisit your data collection to ensure you are collecting the right data. As reporting becomes more regulated, companies must maintain high-quality data. This includes consistent definitions, traceable data sources and robust internal reviews.

• • Prepare for assurance

Document processes that support external assurance. This includes policies, methodologies, data sources, and governance records.

How Context Sustainability helps

Context Sustainability helps organisations prepare for ISSB and SASB reporting requirements. Our advisory services support businesses in interpreting the ISSB standards, integrating SASB industry guidance and building reporting systems that meet investor and regulatory expectations. We help clients strengthen their governance, materiality assessments and data processes to deliver credible, consistent sustainability information.

Companies preparing for future reporting requirements can work with us to assess their current systems, identify gaps and develop a reporting plan that aligns with the ISSB standards and investor expectations. Our team supports clients as they navigate the next stage of reporting and build confidence in their sustainability disclosures.

Frequently Asked Questions

What is the structural relationship between the SASB Standards and the newer ISSB framework?

The International Sustainability Standards Board has officially consolidated the SASB Standards into its organisational governance. The ISSB utilises SASB’s 77 industry-specific disclosure metrics as primary supporting guidance for organisations implementing the general requirements under IFRS S1 and climate disclosures under IFRS S2.

How does the concept of financial materiality apply to investor-focused sustainability reporting?

Financial materiality focuses on sustainability metrics that directly affect a company’s financial condition, operational costs, capitalisation, or asset performance. This precision allows institutional investors to run accurate peer-group risk comparisons within distinct market sectors.

Why are ISSB standards rapidly becoming the recognised global baseline for non-financial disclosures?

Regulators and capital markets across major jurisdictions are adopting ISSB standards to eliminate fragmented international reporting systems. By establishing a uniform baseline for sustainability-related non-financial disclosures, the framework introduces the standardisation that global asset managers need to make investment decisions.

What primary changes must reporting teams make when transitioning from SASB to full ISSB alignment?

Reporting teams must expand their scope from standalone, industry-specific sustainability reporting to a more integrated governance approach. This requires connecting sustainability data directly to financial statements, executing forward-looking climate scenario mapping, and introducing independent assurance-ready internal control systems.