Singapore’s climate-reporting roadmap is phased by listing status, index membership, market capitalisation, and company size. The timetable was revised after the original 2024 announcement, so reporting teams should use the Accounting and Corporate Regulatory Authority’s current requirements rather than an old summary.
The first obligation for all listed issuers is already in effect: report Scope 1 and Scope 2 greenhouse gas emissions for financial years beginning on or after January 1, 2025.
The current timetable for listed issuers
Singapore Exchange-listed issuers fall into three groups.
Straits Times Index constituents must report Scope 1 and Scope 2 emissions and the other ISSB-based climate-related disclosures from financial year 2025. Scope 3 emissions follow from financial year 2026.
Non-STI issuers with market capitalisation of S$1 billion or more report Scope 1 and Scope 2 from financial year 2025. The other ISSB-based climate disclosures begin from financial year 2028.
Non-STI issuers below S$1 billion in market capitalisation also report Scope 1 and Scope 2 from financial year 2025, while the other ISSB-based disclosures begin from financial year 2030.
For non-STI issuers, Scope 3 reporting remains voluntary until further notice. Companies should still build a Scope 3 inventory when it is material to risk management, customer requests, group reporting, or transition planning.
Large non-listed companies enter from 2030
Large non-listed companies are scheduled to begin ISSB-based climate reporting for financial years starting on or after January 1, 2030. The current size test requires both annual revenue of at least S$1 billion and total assets of at least S$500 million.
Exemptions can apply, including for certain subsidiaries whose information is included in a qualifying parent report. Groups should document the legal entity, financial thresholds, parent report, standard used, and public availability rather than assuming that consolidation automatically creates an exemption.
Scope 3 remains voluntary for these large non-listed companies until further notice.
Assurance is a separate implementation track
External limited assurance over Scope 1 and Scope 2 emissions is scheduled from financial year 2029 for listed issuers and financial year 2032 for large non-listed companies.
Assurance may seem distant, but the reporting system producing financial year 2025 emissions becomes the comparative and control foundation for later years. Repeated manual workarounds are harder to repair after several reports have been published.
Build an evidence trail now: source-system exports, reporting boundaries, meter and account populations, calculation methods, estimates, emission-factor versions, reviewer sign-offs, and explanations of corrections.
What ISSB-based reporting adds beyond emissions
Scope 1 and Scope 2 totals are only the first layer. The broader climate disclosures cover governance, strategy, risk management, and metrics and targets. Companies need to show how climate-related risks and opportunities affect their business model, decision-making, financial planning, and resilience.
Use a disclosure map based on IFRS S1 and IFRS S2. Assign every required narrative and metric to a named owner, evidence source, review control, and reporting deadline.
For electricity emissions, preserve location-based and market-based calculations where required and validate contractual instruments rather than equating a procurement claim with a reporting result. Our Scope 2 dual-reporting guide explains the control points.
A phased preparation plan
Companies already reporting
Reconcile the first published emissions report to the underlying inventory, resolve incomplete site or utility-account populations, and formalise quarterly review. STI constituents should integrate Scope 3 and the broader climate narrative into the same control environment.
Companies entering in 2028
Use 2026 and 2027 to perform a full ISSB gap assessment, connect climate risks to financial planning, run scenario analysis, and produce a dry report. Do not limit the program to the emissions work already required.
Companies entering in 2030
Establish data ownership and recurring Scope 1 and Scope 2 controls now. Then sequence materiality, risk, strategy, and value-chain work over several reporting cycles. A long runway should improve data quality, not defer the first inventory until 2029.
Information in this article was verified on August 9, 2026. Singapore’s requirements and implementation guidance may change. This overview is general information, not legal advice.
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