IFRS S2 Climate Disclosure Singapore: Everything Your Business Needs to Know Before FY2029
In June 2023, the International Sustainability Standards Board published two standards that changed the trajectory of corporate climate reporting globally. IFRS S2 — the climate-specific disclosure standard — is now Singapore's baseline for how listed companies must report on climate risk, GHG emissions, and climate-related strategy. If you're a listed company, the clock has already started. If you're a supplier, investor, or lender to listed companies, their requirements are quietly becoming yours. This guide explains what IFRS S2 actually requires, what Singapore's implementation timeline looks like, and what you need to do to be ready — not just for today's disclosures, but for the external assurance requirement arriving in FY2029.
What IFRS S2 Is and Where It Came From
The International Sustainability Standards Board (ISSB) was established at COP26 in Glasgow in November 2021 with a clear mandate: create a single global baseline for sustainability disclosures that capital markets could rely on. After extensive consultation, the ISSB published its first two standards in June 2023 — IFRS S1 (General Requirements for Disclosure of Sustainability-related Financial Information) and IFRS S2 (Climate-related Disclosures).
IFRS S2 didn't emerge from a vacuum. It builds directly on the Task Force on Climate-related Financial Disclosures (TCFD) framework, which the G20 endorsed and which Singapore's MAS had already been promoting since 2020. The four-pillar structure — Governance, Strategy, Risk Management, Metrics & Targets — comes straight from TCFD. What IFRS S2 adds is specificity: precise disclosure requirements, mandatory GHG metrics, and cross-industry metrics that make disclosures comparable across sectors.
Singapore adopted IFRS S2 as the mandatory baseline for SGX-listed companies through a joint announcement by SGX RegCo and the Accounting and Corporate Regulatory Authority (ACRA), aligning with the government's commitments under the Singapore Green Plan 2030 and the national target of net zero emissions by 2050. This makes Singapore one of the first jurisdictions in Asia to mandate IFRS S2-aligned disclosure, positioning its listed companies at the leading edge of global sustainability reporting.
IFRS S2 is mandatory for SGX-listed companies — but it creates a cascade effect. Listed companies need Scope 3 data, which means they need Scope 1+2 data from their suppliers. Even if you're not listed, your largest customers may already be asking.
The Four Pillars of IFRS S2
IFRS S2 is organised around four interconnected pillars that together provide a complete picture of how climate affects a business and how the business is managing that exposure. Understanding all four is essential — they're not four separate reports, they're one integrated narrative.
Pillar 1: Governance. This requires disclosure of how the board and management oversee climate-related risks and opportunities. Specifically: which board committee or individual has responsibility for climate oversight, how often climate is on the board agenda, and how management monitors and reports on climate risks. For many Singapore companies, this is the pillar that forces a governance restructuring — climate can no longer sit in a sustainability team with no board-level visibility.
Pillar 2: Strategy.This is the most narrative-intensive pillar. Companies must describe the climate-related risks and opportunities they've identified across short, medium, and long-term horizons, and explain how those risks affect their business model, strategy, and financial planning. Crucially, IFRS S2 requires scenario analysis — you need to test your business model against at least a 1.5°C scenario (a transition risk lens) and a higher-warming physical risk scenario. This is where many companies will need external expertise.
Pillar 3: Risk Management.This covers how the company identifies, assesses, prioritises, and monitors climate-related risks, and how those processes are integrated into the company's overall enterprise risk management framework. The key word is "integrated" — IFRS S2 expects climate risk to be embedded in the risk register alongside financial, operational, and reputational risks, not siloed in a separate sustainability report.
Pillar 4: Metrics & Targets. This is where the numbers live. IFRS S2 requires specific quantitative disclosures including gross Scope 1, 2, and 3 GHG emissions (calculated per the GHG Protocol), climate-related targets, and cross-industry metrics around capital deployment toward climate solutions. This pillar is the foundation everything else is built on — without accurate, auditable GHG numbers, the rest of the disclosure cannot hold up to scrutiny.
Singapore's Mandatory Timeline
Singapore's implementation of IFRS S2 follows a phased schedule designed to give companies time to build their capabilities. But "phased" does not mean "optional" — each milestone is a hard regulatory requirement for listed companies.
FY2025 (financial years ending in calendar year 2025): Scope 1 and Scope 2 GHG disclosures become mandatory for all SGX Main Board and Catalist-listed companies. This means that if your financial year ends on 31 December 2025, your annual report published in early 2026 must include quantified Scope 1 and Scope 2 emissions with a documented methodology. This is not a soft recommendation — it is a listing rule.
FY2026:Scope 3 disclosure is required on a best-efforts basis. Companies are expected to begin measuring and disclosing their Scope 3 emissions — the indirect emissions across the value chain — even if the data is incomplete or estimated. The "best efforts" framing acknowledges the data complexity involved, but it sets the expectation that companies are actively building Scope 3 capability.
FY2029: External assurance on Scope 1 and Scope 2 disclosures becomes mandatory. This is the most significant milestone because it changes the nature of GHG data from a corporate self-declaration into a verified claim. A qualified third party — typically a Big Four firm or an accredited sustainability assurer — will review your GHG calculation methodology, your data collection process, and your evidence trail, and issue a limited assurance opinion.
FY2025 refers to financial years that end in calendar year 2025. If your financial year ends on 31 March 2026, that is FY2026, not FY2025. Check your own financial year end date — it determines exactly when each requirement applies to you.
What IFRS S2 Asks for Specifically Around Scope 1+2
The Metrics & Targets pillar of IFRS S2 includes cross-industry metrics that every company must disclose, regardless of sector. The most important are in paragraph 29 of the standard:
IFRS S2.29(a) — Gross Scope 1 GHG emissions.This covers all direct emissions from sources owned or controlled by the company — fuel combustion in company vehicles, on-site energy generation, industrial processes, refrigerant leaks, and similar. "Gross" means before any offsets or credits; the standard specifically requires gross figures so that carbon credits cannot obscure the underlying emissions footprint.
IFRS S2.29(b) — Gross Scope 2 GHG emissions, both location-based and market-based. This is where most Singapore companies' largest single emission source sits — purchased electricity from the grid. IFRS S2 requires both calculation methods to be disclosed:
The location-basedmethod calculates emissions using the average emissions intensity of the local electricity grid. For Singapore, this means using Singapore Power's published grid emission factor (which has been declining as Singapore adds solar capacity and transitions to natural gas). This method tells you what your electricity use means for the atmosphere, regardless of what contracts you've signed.
The market-basedmethod calculates emissions using the emissions factor from your specific electricity contract — if you've purchased renewable energy certificates (RECs) or signed a power purchase agreement for clean energy, that contractual instrument can be used to claim a lower or zero emission factor. This method tells you what your purchasing decisions mean for your reported footprint.
Requiring both prevents companies from disclosing only the market-based figure (after buying cheap, low-quality RECs) to present an artificially clean balance sheet. Both numbers must appear, and both must be supported by documented calculations and underlying data.
The Assurance Requirement Arriving in FY2029
External assurance is the requirement that is most misunderstood — and most underestimated in its implications for how companies need to manage their GHG data.
What does "external assurance" mean? It means a qualified, independent third party reviews your Scope 1 and Scope 2 GHG disclosures and issues a written opinion. Singapore's FY2029 requirement specifies "limited assurance" — the lower of two tiers. In a limited assurance engagement, the assurer performs procedures designed to identify whether anything has come to their attention to suggest the disclosures are materially misstated. This is less comprehensive than "reasonable assurance" (the level applied to financial audits), but it is still substantive. The assurer will ask for your data sources, check your calculation methodology, test a sample of underlying utility bills and invoices, and review your emission factors.
This is why FY2029 matters right now, in 2026. If you begin collecting GHG data in 2028, you will have one year of data when the assurer arrives. They will have no baseline to test against, no trend data to compare, and no documented history of your methodology. Assurers look for consistency: consistent data collection, consistent methodology, consistent internal controls. Those things take years to establish, not months.
The companies that will sail through a 2029 assurance engagement are the ones building their evidence chain today: digitising their utility bills, documenting their emission factors, maintaining a hash-chained audit trail of their calculations, and running through a mock assurance review before the real one arrives.
Beyond the numbers themselves, assurers look for evidence of internal controls — systems that prevent errors and detect anomalies. An append-only, hash-chained evidence vault is exactly the kind of control that gives assurers confidence in data integrity.
How Non-Listed Companies Fit In
If you're not listed on SGX, IFRS S2 doesn't apply to you directly. But that doesn't mean you can ignore it.
The supply chain angle.IFRS S2's Scope 3 requirement means that listed companies must disclose their upstream and downstream value chain emissions. If you are a supplier to a listed company — providing manufacturing services, logistics, professional services, or raw materials — your Scope 1 and Scope 2 emissions are part of their Scope 3. They will ask you for this data, and if you can't provide it, they'll either estimate it (which typically produces a higher figure than reality) or find a supplier who can. Procurement questionnaires that ask for a Scope 1+2 figure with methodology documentation are already appearing in Singapore RFP processes.
Voluntary disclosure benefits.EnterpriseSG's SME Sustainability Reporting Programme (updated 1 April 2026) offers up to 50% co-funding for SMEs to build sustainability reporting capabilities. Voluntary disclosure also supports access to green financing — DBS, OCBC, UOB, and several foreign banks operating in Singapore have loan products tied to sustainability performance, and lenders increasingly ask for GHG data as part of their due diligence. Beyond financing, voluntary disclosure demonstrates to clients, employees, and partners that your sustainability commitments are grounded in data, not marketing claims.
How to Prepare Starting Now
The path to IFRS S2 compliance is not a sprint in 2028. It's a steady build that should start today. Here's how to structure it:
Step 1 — Data collection.Identify every emission source in your Scope 1 (direct combustion, refrigerants, company vehicles, on-site processes) and Scope 2 (purchased electricity and heat). For each source, identify the data you collect today (utility bills, fuel invoices, vehicle mileage logs) and the gaps. Most Singapore companies' biggest gap is refrigerant tracking — it often sits with the facilities team and has never been centralised.
Step 2 — Emission calculation.Apply the GHG Protocol methodology to your data using appropriate emission factors (Singapore's grid factor from EMA, IPCC factors for fuel combustion, industry-specific factors where available). Document every factor you use and its source — the version of the IPCC AR the factor comes from, the date it was published, the URL. Assurers will verify this.
Step 3 — Methodology documentation. Write a methodology note explaining your organisational boundary (which entities are included), your operational boundary (which emission sources), your calculation approach, and any exclusions with justification. This document becomes the baseline that every future report is compared against.
Step 4 — Evidence chain. Store the underlying documents — utility bills, invoices, meter readings, refrigerant logs — in a system that preserves them in their original form and links them to the emissions they support. An append-only, hash-chained evidence vault means that neither you nor an assurer can question whether the data has been modified since it was recorded.
Step 5 — Narrative and disclosure.Build the four-pillar IFRS S2 narrative around your data. The Governance section requires board-level input. The Strategy section requires scenario analysis. The Metrics & Targets section sits on top of Steps 1–4.
Step 6 — Assurance preparation. Before FY2029, run a mock limited assurance engagement internally or with an external advisor. Ask yourself the questions an assurer would ask: Where did this figure come from? Can you show me the bill? What emission factor did you use? Why did the figure change between FY2027 and FY2028? The answers need to be immediate and documented.
The companies that treat IFRS S2 as a compliance checkbox will scramble in 2028 and produce numbers that don't survive assurance scrutiny. The companies that treat it as a data management discipline — building the evidence chain now, improving it annually — will be ready when FY2029 arrives.
VerityOS's Scope 1+2 evidence vault is append-only and hash-chained — designed to produce the kind of auditable evidence trail that gives assurers confidence. The IFRS S2 report module generates the four-pillar disclosure aligned to the Singapore timeline, and the assurance pack export packages your evidence for a limited assurance engagement.
Frequently Asked Questions
Build Your IFRS S2 Evidence Chain Today
VerityOS is designed specifically for Singapore companies preparing for IFRS S2 compliance. Our append-only evidence vault, IFRS S2 four-pillar report module, and assurance pack export give you everything you need to be ready — for FY2025 disclosures today, and FY2029 assurance requirements tomorrow.