Scope 3 is already a supplier question — AASB S2 just made the calendar real

Another spreadsheet lands from a buyer organisation. Same lots. New template. Same ask: emissions numbers, preferably “primary,” preferably by Friday.

That ask is not a surprise. Australian climate disclosure for in-scope reporting entities is already live under the Australian Accounting Standards Board Climate-related Disclosures standard (AASB S2). What changed the calendar for the middle of the chain is Scope 3 timing: in the first annual reporting period an entity applies AASB S2, Appendix C lets it omit Scope 3 greenhouse gas emissions (paragraph C4(b)). From the second reporting year, that relief falls away. For a Group 1 entity on a calendar year, that second year is the period commencing 1 January 2026 — so the first mandatory Scope 3 packages for those entities are generally lodged in 2027, not on day one of 2026.

None of that, by itself, makes a mid-tier supplier or a farm an AASB S2 filer. The Corporations Act sustainability-reporting duty sits on the entity required to prepare the sustainability report — typically the buyer or Group, not every upstream plant in its Category 1 map. The supplier question is commercial and programme-shaped: buyers are asking because they must disclose material value-chain emissions, and primary data from specific activities sits high in AASB S2’s Scope 3 measurement framework. That is pressure. It is not a parallel filing duty.

What AASB S2 actually changes for the middle of the chain

AASB educational material (August 2025) is clear on the reporting entity’s job: it must consider all 15 Scope 3 categories in the Greenhouse Gas Protocol Corporate Value Chain Standard, then determine which are relevant to include. It is not required to disclose every category. It also cannot shrink its value-chain look by clinging only to the Protocol’s “minimum boundaries” where AASB S2 asks for the whole chain and material information.

For measurement, AASB S2 tells the reporting entity to use all reasonable and supportable information available at the reporting date without undue cost or effort (the Standard’s proportionality language — see educational material Question 8 and paragraph B39). That phrase is about how the filer prioritises data and estimation. It is not a statutory right for buyers to compel supplier systems, and it is not a free-standing supplier defence outside contract. Treat it as practice and proportionality for the entity preparing the sustainability report — not a bright-line legal test either way.

Industry is already translating that into food-and-grocery reality. On 3 February 2026 the Australian Food and Grocery Council (AFGC) walked members through AASB S2 with Asahi Beverages and Ernst & Young (“Decoding the Disclosure”). Their stated objective was low-cost compliance for Scope 3 reporting of Australian-sourced foods, explicitly nodding to legislation’s “without undue cost and effort” framing, and pointing to a workbook of mid-range Australian food and drink emission factors drawn from the Commonwealth Scientific and Industrial Research Organisation, agricultural research and development corporations, the Australian Life Cycle Inventory, peer-reviewed work, and existing calculators. That is industry capability, not law. Useful. Not a substitute for AASB S2 or the Corporations Act.

Then the 2026–27 Federal Budget. The Budget did not rewrite AASB S2’s phase-in. Separately, the government said it would consult on clarifying how “undue cost or effort” applies, adjusting assurance settings for proportionality, and setting clearer boundaries on supplier information requests (with small businesses called out). Consultation is not legislation. Until boundaries are drafted and enacted, assuming you are exempt from buyer data asks is guessing. Assuming every ask is mandatory law is also guessing.

Portfolio versus farm-level — keep the ceiling visible

An anonymised intensity figure can feed a buyer’s portfolio Scope 3 estimate. It is not Science Based Targets initiative Forest, Land and Agriculture (SBTi FLAG) farm-level data. Named (and evidence-tier) sharing is a separate commercial choice — still not an Australian legal filing duty for the supplier.

SBTi FLAG shapes how companies that commit to science-based targets treat FLAG-related emissions in inventories and targets. It is not an Australian farm statute, and it does not turn an anonymised cohort number into land-management-unit primary data. Consent tiers (anonymised → named → named + evidence) change what a buyer may honestly use the artefact for. They do not invent a disclosure obligation the Corporations Act never wrote for the supplier.

Factors are catching up. The join problem is not.

AFGC’s workbook move matters because national inventory factors still leave gaps for many foods. Standardising mid-range Australian factors reduces friction for Category 1 estimation where primary supplier data is not available without undue cost or effort to the reporting entity.

What factors do not solve is the join: which buyer sees which intensity, for which lots, under what consent, and whether that share is revoked when the commercial relationship ends. Spreadsheet-chasing every buyer programme rebuilds the same intensity under a new logo. The durable pattern for mid-tier suppliers is different: sit on intensity that already exists from engines you already use (AIA EAP– or Cool Farm–class outputs where they fit), provide once, grant per buyer, revoke when you mean to. That is consent and allocation — not another farm calculator, and not a claim that any sharing method is “SBTi approved” or “FLAG validated.”

Bottom line

AASB S2 made the buyer’s Scope 3 calendar real. The supplier question was already here; the calendar made it louder. Answer it as a commercial grant problem with clear ceilings — portfolio versus farm-level, entity duty versus supplier ask — not as a new legal filing you were never assigned.

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