IFRS S2 reporting deadlines by jurisdiction (2025–2028)
There is no single IFRS S2 deadline. The ISSB issues the standard; each jurisdiction decides when — and for whom — it becomes mandatory. The result is a patchwork of first reporting periods and assurance phase-ins that can be two or three years apart depending on where you list.
If you operate across borders, the practical question isn't "when is IFRS S2 due?" but "when is my first mandatory period, in my jurisdiction, for an entity of my size?" Here's the landscape across nine major regimes, with the first mandatory reporting period and the assurance trajectory.
The deadlines at a glance
| Jurisdiction | Regime | First mandatory period | Assurance |
|---|---|---|---|
| Malaysia | NSRF (ISSB-aligned) | Main Market large-cap: FY2025 · others FY2026 · ACE Market & large non-listed FY2027 | Limited assurance on Scope 1&2 phased from FY2027 |
| Singapore | SGX (ISSB-aligned) | Listed issuers: FY2025 · large non-listed (rev ≥ S$1bn): FY2027 | External limited assurance ~FY2027 |
| Australia | AASB S2 (mandatory) | Group 1 (largest): FY2025 · Group 2: FY2026 · Group 3: FY2027 | Limited from year 1, reasonable over all disclosures by ~FY2030 |
| United Kingdom | UK SRS S1/S2 | Endorsement 2025–26; FCA listing rules to follow. Voluntary now | Under consultation |
| Canada | CSDS 2 (ISSB-aligned) | Voluntary from FY2025; mandatory pending CSA rule | To follow the CSA rule |
| California (US) | SB 261 / SB 253 | SB 261 climate-risk report due Jan 2026; SB 253 Scope 1&2 from 2026 (FY2025 data), Scope 3 from 2027 | SB 253: limited 2026, reasonable 2030 |
| Japan | SSBJ (ISSB-aligned) | Phased from FY beginning Apr 2027 for the largest Prime-market issuers | Framework in development (FSA/JICPA) |
| Hong Kong | HKEX / HKFRS S2 | Main Board LargeCap mandatory FY2025; others comply-or-explain → mandatory | Roadmap under development |
| Brazil | CVM Res. 193 (ISSB) | Voluntary 2024–25; mandatory from FY2026 for public companies | To be specified by CVM |
Reading the patterns
A few things stand out once you line these up.
Almost everyone phases by size
Malaysia, Australia, Singapore and Hong Kong all start with their largest listed issuers and bring smaller entities in over two to three years. If you're a mid-market reporter, your first mandatory period is often FY2026 or FY2027 — not the headline FY2025 date that applies to the giants. Knowing which wave you're in is the single most important planning input.
Assurance is coming, just behind disclosure
Most regimes introduce limited assurance over Scope 1 and 2 emissions a year or two after first disclosure, then escalate toward reasonable assurance over the full set later. Australia is explicit about the glide path to reasonable assurance by around FY2030. The implication: even if your first cycle isn't assured, you should prepare it as if it will be — because next cycle, it probably is.
The US is a special case
California's SB 261 and SB 253 don't reference IFRS S2 directly — they're built on the TCFD framework and the GHG Protocol — and they apply to companies "doing business in California" above revenue thresholds, regardless of where they're headquartered. If you sell into California at scale, these can apply even if your home jurisdiction hasn't mandated anything yet.
What this means for first-cycle planning
The deadline determines your timeline, but not your approach. Whatever your first mandatory period, the work is the same: identify your disclosures across the four IFRS S2 pillars, gather the underlying data with its lineage, and build the evidence trail an assurer will eventually test. Starting that a cycle early — even voluntarily — is how the smoothest first audits happen.
Find your jurisdiction's specifics in 6 minutes
Our free readiness diagnostic asks for your jurisdiction and reporting period, then returns a 12-page gap report with deadline context for your specific regime.
Run the free diagnostic →Once you know your timeline, the next question is what an assurer will actually test when they review it. We cover that in what auditors actually check in a first-cycle IFRS S2 review.