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Global baseline

ISSB standards, country by country

IFRS S1 and S2 are the closest thing to a global sustainability reporting standard. They carry legal force only where a jurisdiction adopts them, and over 45 are adopting or moving towards adoption.[5]

Adoption by country →Check what applies
Checked 6 October 2026IFRS S1IFRS S2Adoption tracker
The two standards

General rules, then climate

IFRS S1 sets the general requirements: disclose sustainability-related risks and opportunities that could reasonably be expected to affect the company’s prospects, for the same reporting entity and period as the financial statements, published at the same time.[2]

IFRS S2 applies that to climate. It requires Scope 1, 2 and 3 greenhouse gas emissions, climate-related targets, climate resilience analysis, and industry-based metrics.[3]

Both follow TCFD’s four pillars: governance, strategy, risk management, and metrics and targets. A company already reporting under TCFD has most of the structure.

First-year reliefs

  • Report on climate only, before the wider S1 topics.
  • Omit Scope 3 emissions.
  • Keep a non-GHG Protocol measurement method already in use.
  • Skip comparative information.[2],[3]
45+Jurisdictions adopting or taking steps towards ISSB standardsIFRS Foundation, Sep 2026[5]
22Jurisdictions with finalised adoption profilesIFRS Foundation, Sep 2026[5]
2024Effective for periods beginning on or after 1 January 2024IFRS Foundation[1]
2027IFRS S2 amendments take effect, 1 JanuaryIFRS Foundation[4]
Adoption tracker

Who has adopted

The major markets, with the status that matters to a reporting team: is it mandatory, and from when?

Adoption is not one-way. Brazil made ISSB reporting mandatory for listed companies and then, in May 2026, made it voluntary again.[11] Canada’s regulators paused their rule.[10]

Smaller adopters in 2026 include Nigeria, Peru and Uzbekistan.[13]

AustraliaMandatory

AASB S2 is mandatory under the Corporations Act: Group 1 from financial years starting on or after 1 January 2025, Group 2 from 1 July 2026, Group 3 from 1 July 2027.[6]

JapanMandatory, phased

SSBJ standards (March 2025) apply to Prime Market companies by market capitalisation: ¥3tn+ from fiscal years ending March 2027, ¥1tn+ from March 2028, ¥500bn+ from March 2029. Limited assurance follows a year later.[7]

SingaporeMandatory for listed

All listed companies report Scope 1 and 2 from FY2025. Straits Times Index companies report full IFRS S2 from FY2025 and Scope 3 from FY2026. Large non-listed companies are deferred to FY2030.[8]

Hong KongMandatory for large caps

HKEX climate rules based on IFRS S2 apply on a comply-or-explain basis from 1 January 2025 and are mandatory for large-cap issuers from 1 January 2026. HKFRS S1 and S2 took effect on 1 August 2025.[9]

South KoreaAdopted, from 2027

Adopted in July 2026, applying from 2027, per a secondary tracker.[13]

United KingdomVoluntary; FCA proposed

UK SRS S1 and S2, closely based on ISSB, published February 2026 for voluntary use.[14] The FCA has proposed requiring them of listed companies.[15] UK SRS →

CanadaVoluntary

CSDS 1 and 2 were issued in December 2024 for voluntary use. The securities regulators paused their mandatory rule in April 2025.[10]

BrazilVoluntary since May 2026

CVM Resolution 193 had made ISSB-based reporting mandatory for listed companies from 2026. Resolution 244 of 29 May 2026 revoked that; reporting is voluntary, with comply-or-explain from 2027.[11]

ChinaTrial standards

The Ministry of Finance issued its Basic Standard (trial) in 2024 and a climate standard (trial) on 19 December 2025. Both are voluntary until a mandatory scope is set, with a national system targeted by 2030.[12]

United StatesNot adopted

No federal adoption. California’s SB 261 accepts a report under IFRS S2.[16] US rules →

Amendments

What changed in December 2025

Targeted amendments to IFRS S2, issued on 11 December 2025 and effective from 1 January 2027, with early application allowed:[4]

  • Scope 3 category 15 may be limited to financed emissions, excluding derivatives.
  • Industry classifications other than GICS are allowed.
  • Jurisdictional relief from the GHG Protocol can apply to part of an entity.
  • A new jurisdictional relief covers global warming potential values.
  1. 26 Jun 2023ISSB
    ISSB issues IFRS S1 and IFRS S2
  2. 11 Dec 2025ISSB
    ISSB issues targeted amendments to IFRS S2
  3. 1 Jan 2027ISSB
    IFRS S2 amendments take effect
Questions

ISSB, answered

What is the difference between IFRS S1 and IFRS S2?

IFRS S1 sets the general requirements for disclosing sustainability-related risks and opportunities. IFRS S2 applies them to climate, including Scope 1, 2 and 3 emissions and climate resilience. Both use the four TCFD pillars: governance, strategy, risk management, and metrics and targets.[2],[3]

When did the ISSB standards take effect?

Issued 26 June 2023, effective for annual periods beginning on or after 1 January 2024.[1] They bind a company only where a jurisdiction adopts them, on that jurisdiction’s timetable.

What changed in the December 2025 IFRS S2 amendments?

Issued 11 December 2025, effective from 1 January 2027 with early application allowed. Entities can limit Scope 3 category 15 to financed emissions (excluding derivatives), use classifications other than GICS, apply jurisdictional relief from the GHG Protocol to part of the entity, and use jurisdiction-required global warming potential values.[4]

How many countries have adopted ISSB standards?

The IFRS Foundation said in September 2026 that over 45 jurisdictions have adopted or are taking steps towards the standards.[5] “Adopted” ranges from mandatory reporting for listed companies to voluntary national standards, so the country detail matters more than the count.

Sources

Where this comes from

Primary sources unless labelled secondary.

  1. [1]ISSB issues inaugural global sustainability disclosure standardsIFRS Foundation · 26 June 2023
  2. [2]IFRS S1 General Requirements for Disclosure of Sustainability-related Financial InformationIFRS Foundation · issued June 2023
  3. [3]IFRS S2 Climate-related DisclosuresIFRS Foundation · issued June 2023, amended December 2025
  4. [4]ISSB issues targeted amendments to IFRS S2IFRS Foundation · 11 December 2025
  5. [5]Adoption of IFRS Sustainability Disclosure Standards (World Standard-setters Conference plenary)IFRS Foundation · September 2026
  6. [6]Climate-related financial reporting guidanceAustralian Treasury
  7. [7]Roadmap for sustainability disclosure and assurance (SSBJ standards)Financial Services Agency, Japan · April 2026
  8. [8]Update on climate reporting requirements for listed and large non-listed companiesACRA and SGX RegCo · 25 August 2025
  9. [9]Roadmap on sustainability disclosure in Hong KongHong Kong SAR Government · 10 December 2024
  10. [10]Adoption of CSDS 1 and CSDS 2Canadian Sustainability Standards Board (FRAS Canada)
  11. [11]CVM Resolution 193 (consolidated text, as amended by Resolution 244 of 29 May 2026)Comissão de Valores Mobiliários, Brazil
  12. [12]Corporate Sustainability Disclosure Standard No. 1: Climate (trial)Ministry of Finance, People's Republic of China · December 2025
  13. [13]Jurisdictional adoption of IFRS Sustainability Disclosure Standards: trackerDeloitte IAS Plus (secondary) · 17 September 2026
  14. [14]UK Sustainability Reporting Standards (guidance)GOV.UK · last updated 25 February 2026
  15. [15]CP26/5: Aligning listed issuers' sustainability disclosures with international standardsFinancial Conduct Authority · 30 January 2026
  16. [16]California Health and Safety Code §38533 (SB 261, climate-related financial risk)California Legislative Information · statute as amended by SB 219