Understanding ASRS reporting timelines and assurance requirements - 100% Renewables

Understanding ASRS reporting timelines and assurance requirements

[Update: 2 April, 2024] – This blog post has been updated to reflect the latest timelines for Group 1 companies.

Welcome back to our comprehensive exploration of the Australian Sustainability Reporting Standards (ASRS), which is currently in the exposure draft stage. In this instalment, we focus on the proposed reporting timelines and assurance requirements for each group under ASRS. Knowing when to report and the level of assurance needed for your disclosures is crucial.

Join Barbara Albert, our Co-CEO, in this video as she details the ASRS compliance timelines and what they mean for your business, highlighting the importance of early preparation and understanding assurance requirements.

Previously in the series

Before diving into the timelines and assurance, ensure you’re up to date with our discussion on how Australian companies are categorised into cohorts for ASRS compliance. Understanding your group is a key step due to the varying reporting timelines.

Detailed ASRS Reporting Timelines and Assurance Levels

ASRS categorises businesses into three groups, each with specific timelines and assurance demands:

1️⃣Group 1 entities: Starting from 1 January 2025, you’re on the clock. The initial phase requires limited assurance on Scope 1 and Scope 2 GHG emissions, progressing to reasonable assurance on governance disclosures. By FY 2028/29, expect to expand reasonable assurance across all climate disclosures, including a deeper dive into Scope 3 emissions, scenario analyses, and transition plans.

2️⃣Group 2 entities: Enjoy a bit more breathing room with a one-year delay compared to Group 1. Your journey begins in earnest in FY 2026/27, mirroring Group 1’s assurance requirements but on a delayed schedule, allowing for strategic alignment with ASRS mandates.

3️⃣Group 3 entities: Reporting starts in FY 2027/28, offering the most preparation time. Your assurance trajectory follows Group 2’s path, just one year later, encompassing the same comprehensive assurance levels across your climate disclosures.

The importance of understanding assurance

Assurance ensures the accuracy and reliability of your reported information. Initially, Group 1 will need limited assurance on Scope 1 and Scope 2 emissions and reasonable assurance on governance disclosures, progressively moving towards reasonable assurance across all climate disclosures by 2028/29.

Here is more information on the differences in ‘limited’ and ‘reasonable’ assurance levels:

➡️Limited assurance: This is like a basic check-up. The auditor does a review to see if anything stands out as wrong or unusual, but they don’t dig into every single detail. It’s less thorough and provides a lower level of confidence, but it still offers some assurance that the information is correct.

➡️Reasonable assurance: This is a more detailed and thorough check. The auditor does a deeper dive, looking closely at the information and how it’s gathered and reported. This level of assurance gives a higher level of confidence that the reported information is accurate and reliable.

Why starting early matters

Despite the staggered timelines, it’s crucial for businesses in all groups to begin preparations now. Quality data, thorough assessments, and robust reporting systems take time to develop. Procrastination may seem feasible, but the deadlines will approach quickly. Starting early facilitates a smoother transition to mandatory reporting.

Next in the series

In our forthcoming blog post, we’ll explore the readiness of Australian companies for ASRS reporting, and examine the advantages held by companies that have already embraced voluntary sustainability reporting frameworks.


Navigating the ASRS’s reporting timelines and understanding assurance requirements are pivotal in your compliance journey. At 100% Renewables, we’re dedicated to supporting your business through this transition, from initial preparation to achieving comprehensive compliance and beyond. Whether it’s providing carbon footprint assessments, identifying climate-related risks and opportunities, establishing targets, or developing transition plans, we’re dedicated to supporting you every step of the way.

For expert guidance on ASRS compliance and to learn more about how your business can meet and exceed these reporting standards, reach out to us at 100% Renewables. Let’s ensure your climate-related reporting showcases your commitment to sustainability and positions your business as a leader in climate resilience.

ASRS Complimentary Course

In our ongoing dedication to assist businesses in their sustainability endeavours, we’ve revamped this multi-part blog and video series into a complimentary online course. Alongside the video content, the course offers additional resources and quizzes designed to enhance your comprehension of the ASRS.

Kickstart your journey towards mastering the ASRS. Join now by following this link. Don’t hesitate to share this opportunity within your network to collectively advance the climate agenda.

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