California Refines Its Climate Disclosure Rules. Public Companies Gain More Time, but Compliance Expectations Remain

The California Air Resources Board (CARB) has issued targeted amendments to the proposed regulations implementing California's climate disclosure laws, SB 253 and SB 261. The amendments went out with a 15-day public consultation, which closed on 11 August.

This is not a new compliance regime, and it isn't a change of direction. It is CARB working through the practicalities of getting the first reporting cycle off the ground, largely in response to what companies raised during consultation. For publicly listed companies with operations or business activities in California, it is worth a read as a checkpoint: the shape of year one is now considerably clearer than it was.

What the amendments cover

The first reporting deadline moves. Scope 1 and Scope 2 greenhouse gas emissions for the 2026 reporting year would be reported by 10 November 2026, rather than 10 August — three additional months for the inaugural disclosures.

Scope 3 is out for the first year. Scope 3 emissions would not be required for the 2026 reporting year. Transition relief that CARB had previously announced separately is now written into the regulation itself, which removes a layer of uncertainty about what first-year compliance actually demands.

A one-time option for the first cycle. CARB proposes retaining the existing transition framework for determining the applicable reporting year based on an entity's fiscal year-end, while adding a one-time option: companies may report emissions information they already possessed or were already collecting as of 5 December 2024, or, where applicable, explain that such information was not being collected at that time.

Consolidated filing at the parent level. Where permitted under the regulation, reports and annual fees may be submitted on a consolidated parent-company basis rather than subsidiary by subsidiary.

Clarifications on the recurring questions. CARB addresses how "doing business in California" and revenue thresholds should be assessed, the treatment of certain intercompany and wholesale electricity transactions, recordkeeping obligations, and a number of other technical compliance requirements.

What this means for publicly listed companies

For multinational groups with California operations, the practical effect is to reduce near-term implementation pressure without altering the underlying obligations.

The additional time is most useful for the unglamorous work: strengthening governance arrangements, building internal reporting controls, and coordinating emissions data collection across business units and jurisdictions that have never had to produce this information on a common basis before. For many issuers, that preparation is what determines whether the first disclosure is reliable.

Deferring Scope 3 lets companies establish dependable Scope 1 and Scope 2 processes before taking on value-chain emissions, which are harder to source and harder to stand behind. That sequencing matters most for groups still building sustainability reporting capability internally.

Consolidated parent-level filing reduces duplication across subsidiaries and should produce more consistent group-wide disclosure.

And the scoping clarifications are the part worth reading closely if you are still determining whether the legislation captures you at all. "Doing business in California" and the revenue threshold are where the edges of the regime sit.

What this means to you

None of this is a softening. CARB is refining implementation to make compliance workable while holding its policy objectives in place — and these obligations sit alongside, not instead of, ordinary SEC reporting requirements.

If you may be within scope of SB 253 or SB 261, the useful response is to review your governance framework, assess whether your emissions data collection can actually produce what the regime asks for, and confirm your reporting processes will meet the requirements when they bite. California remains committed to mandatory climate disclosure; what has changed is that the pathway into it is more achievable.

How we can help

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