Insight

Sustainability reporting and assurance: 2025 in review

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QUICK SUMMARY
  • 2025 marked major progress in sustainability reporting in Australia, including the launch of the Australian Sustainable Finance Taxonomy, new greenwashing enforcement, and amendments to AASB S2 and AUASB assurance standards. 
  • Regulatory and legislative changes accelerated, with ASIC guidance, Treasury consultations, and the first mandatory climate-related disclosures for Group 1 entities shaping the reporting landscape. 
  • Looking ahead to 2026, expect the first Group 1 sustainability reports from February – April, ASIC’s observations mid-year, and continued support from AASB and AUASB through guidance and education.
It has been a big year for sustainability reporting and assurance. While unsurprisingly there was significant focus on the first period of mandatory climate-related disclosures, 2025 also brought a range of notable sustainability developments in Australia.
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These included launching the Sustainable Finance Taxonomy, new enforcement against greenwashing, and a number of amendments to both AASB S2 and the Auditing and Assurance Standards Board’s (AUASB) new sustainability assurance standards. 

Internationally, nature & biodiversity risks also continued to grow in prominence, resulting in the International Sustainability Standards Board’s (ISSB) stated intention to release a new nature-related standard by October 2026. As this year draws to a close, we reflect on the timeline of key reforms and consultations we have seen over the months.

  • 1 January marked the start of the first mandatory reporting period for Group 1 entities with 31 December financial year end.
  • The AUASB issued ASSA 5010 and ASSA 5000, completing the necessary assurance standards dictating the phasing and standards for assurance of sustainability reports.
  • The Government exposed draft legislation for an amendment to the Corporations Act to extend the modified director liability provisions to voluntary sustainability reports.
  • The ISSB decided to propose amendments to IFRS S2
  • The AUASB opened consultation on amendments to ASSA 5010, reflecting clarifications about assurance in relation to the Directors’ report and specifying phasing of assurance for voluntary reports.
  • The AUASB also opened consultation on amendments to ASSA 5000 to incorporate illustrative sustainability auditor reports.
  • The Treasury Laws Amendment (Strengthening Financial Systems and Other Measures) Bill 2025 received Royal Assent, effective 5 December 2025.
  • The AASB is anticipated to issue the proposed amendment to AASB S2, effective 1 January 2027, with early adoption permitted.

What to expect in 2026

In the coming year, we are expecting to see the first round of Group 1 reports being released from February to April 2026. Many of these reports will be for private unlisted entities.

ASIC is expected to release observations on the first round of reports in May to June 2026, ahead of the second round of Group 1 reports from August to October. The AASB & AUASB are both also expected to continue supporting implementation with further educational materials. 

We will continue bring you the latest new developments in sustainability reporting and assurance through our insights and webinars. 

Article contributed to by Lily Fox – Senior Manager, Sustainable Finance  

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