Australia Considers Delaying Stricter Climate Assurance Rules to Cut Reporting Costs

Australia's Treasury has opened a consultation on reforms intended to reduce the cost of complying with the country's mandatory climate disclosure regime without weakening the credibility or comparability of corporate climate reporting. The review centres on three areas: external assurance requirements, guidance on key reporting concepts, and the burden of information requests flowing down corporate supply chains. Australia introduced mandatory climate-related reporting legislation in 2024, with requirements beginning to apply to the country's largest companies and asset owners from 2025.

 

Why the Three Assurance Options Represent Genuinely Different Trade-Offs

 

Australia's existing framework is designed to progress from limited assurance toward the more demanding reasonable assurance standard from mid-2030, and Treasury is now reviewing whether that transition should proceed as planned. Reasonable assurance requires considerably more extensive audit evidence, controls, documentation and testing than limited assurance, translating directly into higher compliance costs for reporting companies and their external auditors.

The consultation sets out three distinct paths forward, each carrying different cost and credibility implications. Removing the planned transition entirely and retaining limited assurance indefinitely would minimise ongoing compliance costs but would mean Australian climate disclosures never reach the higher assurance standard originally planned, potentially affecting how comparable Australian reporting is against jurisdictions that have moved to reasonable assurance. Delaying the transition to 2035 preserves the eventual goal of reaching reasonable assurance while giving companies, auditors and data providers additional time to build the systems needed to meet that higher standard reliably, a middle path between abandoning the goal and rushing toward it. The third option, applying reasonable assurance only to more established metrics like Scope 1 and Scope 2 emissions while leaving less mature areas such as Scope 3 under limited assurance, reflects a recognition that direct emissions data is generally more mature and verifiable than the considerably more complex value-chain emissions data Scope 3 requires, tailoring assurance rigour to the actual maturity of the underlying data category rather than applying a uniform standard regardless of how reliable different emissions categories currently are.

 

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Why the Scope 3 Supplier Request Problem Is a Genuine Structural Issue

 

Treasury's consultation specifically raises concern that large reporting companies could pass significant data collection demands down their supply chains to smaller suppliers, who may lack the resources or systems to respond to detailed emissions data requests efficiently. The consultation states that "reporting practices observed overseas under similar disclosure requirements has highlighted the potential value of clearer boundaries on value-chain information requests," indicating this is not a hypothetical Australian concern but one Treasury has observed play out as a genuine problem in other jurisdictions that have already implemented comparable Scope 3 reporting requirements.

That structural issue arises because Scope 3 emissions, indirect emissions occurring throughout a company's value chain rather than within its own direct operations, require reporting companies to gather data from potentially hundreds or thousands of suppliers, many of which may be small businesses without dedicated sustainability reporting capacity. Without clear boundaries on what constitutes a reasonable information request, larger reporting companies facing their own compliance pressure could reasonably be expected to request increasingly detailed data from suppliers regardless of those suppliers' capacity to provide it, effectively transferring compliance burden down the supply chain to entities not directly subject to the reporting mandate themselves.

Treasury's proposed responses include developing clearer guidance on what constitutes a reasonable information request, giving both reporting companies and smaller suppliers greater certainty about what data can legitimately be demanded, alongside expanding access to publicly available domestic emissions factors that companies could use as secondary data instead of repeatedly requesting detailed primary data from smaller suppliers directly.

 

How This Connects to a Broader Global Pattern of Reporting Recalibration

 

This consultation follows separately announced changes in Australia's 2026 Budget that would raise the revenue and asset thresholds determining which companies must publish audited financial and sustainability reports, exempting companies with revenue below A$100 million and assets below A$50 million. Though structured as a separate policy change, that threshold adjustment reflects the same underlying objective driving this consultation: reducing compliance costs while attempting to preserve overall climate reporting transparency for the larger companies that remain subject to the regime.

That combination of measures situates Australia within a broader international pattern of governments reconsidering the pace and rigour of climate disclosure requirements, a dynamic visible elsewhere in recent reporting, including the EU's own December 2025 Sustainability Omnibus reforms to CSRD and CSDDD, and the US government's formal comments requesting the EU narrow those same directives' scope. Whether Australia's specific approach, calibrating assurance rigour to data maturity rather than applying uniform standards, and establishing clearer supply chain information request boundaries, succeeds in reducing genuine compliance burden without undermining the credibility and comparability of Australian climate disclosures, will likely be closely watched by other jurisdictions navigating similar tensions between reporting rigour and compliance cost as mandatory climate disclosure regimes mature globally.