HKFRS S1 and S2: Sustainability Disclosure Is No Longer Optional

• Standards: HKFRS S1 — General Requirements for Disclosure of Sustainability-related Financial Information; HKFRS S2 — Climate-related Disclosures
• Voluntary Application: 1 August 2025
• Mandatory (Large-cap): 1 January 2026
• Basis: Mirrors IFRS S1 and S2 from the ISSB

For years, sustainability reporting was a choose-your-own-adventure exercise. GRI, TCFD, CDP, SASB—pick a framework, any framework. The result was a fragmented landscape where comparing two companies’ sustainability disclosures was like comparing apples to aircraft carriers.

That era is ending.

The publication of HKFRS S1 and S2 marks a fundamental shift. These aren’t supplementary disclosures bolted onto the annual report—they’re designed to be integrated into general-purpose financial reports with the same rigour as your revenue recognition or impairment testing.

What’s Required

HKFRS S1 (General Requirements) establishes the overarching framework, structured around four pillars:

1. Governance—Who’s overseeing sustainability risks? What processes, controls, and procedures are in place?
2. Strategy—How do sustainability risks and opportunities affect your business model, strategy, and financial planning? This includes scenario analysis.
3. Risk Management—How do you identify, assess, and prioritise sustainability-related risks? How does this integrate with your overall risk framework?
4. Metrics and Targets—What are you measuring? What targets have you set? What progress have you made?

HKFRS S2 (Climate-related Disclosures) adds the specifics:

• Physical risks: acute events (floods, storms) and chronic shifts (temperature changes, sea level rise)
• Transition risks: carbon taxes, technology disruption, reputational impacts
• Scope 1, 2, and 3 GHG emissions
• Climate scenario analysis: at least two scenarios, including one consistent with the 1.5°C pathway
• Quantitative estimates of anticipated financial effects

The Phased Rollout

Timeline	Entity Type	Requirement
From Jan 2025	All Main Board Issuers	”Comply or explain” for new climate requirements
From Jan 2025	All Listed Issuers	Mandatory Scope 1 and 2 GHG emissions disclosure
From Jan 2026	Large-cap listed companies	Full mandatory HKFRS S1 and S2
After 2027	Mid-cap listed companies	Expected to adopt S1 and S2
Expected 2028	Large publicly accountable entities	Full adoption

Voluntary application has been available since 1 August 2025.

Assurance Is Coming Too

The AFRC has confirmed a sustainability assurance framework. Limited assurance over Scope 1 and 2 GHG emissions will be required starting from the third financial year of mandatory reporting. Phase 2 extends to all remaining mandatory disclosures from the fifth year.

The message is clear: the bar for data quality will keep rising.

The Connectivity Requirement

Here’s the part that catches people off guard. Sustainability disclosures must connect to and be consistent with the financial statements. If you’ve identified a material climate risk in your S2 disclosures, it needs to be reflected in your impairment assessments, useful life assumptions, discount rates, and provisions.

This isn’t a standalone exercise. It requires the sustainability team and the finance team to be in the same room—or at least on the same page.

First-Year Relief

For the first year of application, entities may omit Scope 3 disclosures and comparative information. That’s helpful, but don’t let it become an excuse to delay. Scope 3 data collection across the value chain is the hardest part, and it takes time to build the infrastructure.

Where to Start

• Establish data governance for GHG emissions across the value chain
• Run at least two climate scenarios, documenting inputs, assumptions, and outputs
• Review whether material climate risks are already reflected in your financial statement assumptions
• Invest in ESG software for automated data collection and tracking
• Engage early with your auditors on the connectivity between sustainability and financial reporting

The transition is significant. But the phased approach gives you time to build capability. The key is to start now—not when the deadline is breathing down your neck.

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This article is for informational purposes only and does not constitute professional accounting or legal advice.