Key takeaways

On June 24, 2026, the California Air Resources Board proposed a three-month extension for initial greenhouse gas reporting under SB 253.

The new deadline for Scope 1 and Scope 2 emissions data is November 10, 2026, moving from the original August 10, 2026, date.

CARB plans to introduce targeted revisions and clarifying amendments to the law's implementing regulations.

Regulated entities gain a brief compliance window extension while awaiting finalized regulatory text.

The Development

The California Air Resources Board (CARB) has pushed back the initial compliance window for the state's incoming corporate climate disclosure regime. On June 24, 2026, CARB issued a formal notice regarding California's Climate Corporate Data Accountability Act, known statutorily as SB 253 (California). The agency announced a proposal to extend the initial reporting deadline for Scope 1 and Scope 2 greenhouse gas emissions by three months. Under the revised timeline, the first wave of emissions data, originally due on August 10, 2026, must now be submitted by November 10, 2026. This regulatory development was first reported in legal media on or about June 26, 2026.

Why It Matters

Environmental reporting at this scale is a highly technical endeavor. A failure to accurately report Scope 1 and Scope 2 emissions could expose companies to regulatory enforcement actions or reputational damage. The three-month deferral matters because it provides a necessary pressure release valve for companies building compliance architecture from scratch. Gathering, verifying, and reporting these greenhouse gas emissions requires extensive internal coordination across operations, finance, and legal departments, as well as engagement with third-party auditing firms. A shift from August to November 10, 2026, allows corporate compliance departments an extra quarter to finalize their data collection protocols.

Furthermore, CARB indicated plans to make targeted revisions or clarifying amendments to the implementing regulations for the law. This signals that the agency recognizes existing ambiguities in the regulatory framework. Companies therefore have more time to adjust their reporting strategies in response to whatever clarifying amendments CARB ultimately adopts. The delay prevents a scenario where businesses submit complex emissions data under rules that the regulatory body is actively attempting to rewrite.

Who Should Care

For lawyers

Regulatory counsel advising large corporate clients operating in California must immediately update their internal compliance calendars. The shift to a November 10, 2026, deadline means attorneys have additional time to review the promised targeted revisions to the implementing regulations. Counsel should monitor CARB rulemaking dockets closely to ensure that any clarifying amendments do not materially alter the data collection methodologies their clients have already implemented. Advising clients on SB 253 (California) compliance will require interpreting these forthcoming revisions quickly once the agency publishes them.

For consumers and the public

While the general public will eventually gain unprecedented visibility into corporate greenhouse gas emissions, this delay means those disclosures will arrive later than initially expected. Transparency advocates and consumers tracking corporate climate impacts will have to wait until late 2026 to review the first batch of Scope 1 and Scope 2 data. The deferral delays the public availability of standardized climate metrics that advocacy groups and investors intend to use for evaluating corporate environmental performance.

Legal Background

The California legislature enacted SB 253 (California) to mandate comprehensive greenhouse gas emissions reporting for large entities doing business within the state. The law requires covered corporations to publicly disclose their direct emissions, categorized as Scope 1, and indirect emissions tied to purchased electricity and energy, categorized as Scope 2. Under the initial statutory framework, the first reporting deadline for these emissions was set for August 10, 2026.

When a state legislature passes a sweeping environmental mandate, the administrative agency tasked with implementation often requires multiple rulemaking phases to finalize the technical details. In this instance, CARB holds the responsibility for translating the broad legislative directives of SB 253 (California) into actionable, enforceable regulations. The legislation directed CARB to develop and adopt implementing regulations to guide companies on how to format, verify, and submit this data. As the initial deadline approached, regulated entities faced uncertainty regarding the precise mechanics of compliance under the preliminary rules. The impending August 10, 2026, deadline created significant anxiety among corporate officers tasked with certifying the accuracy of massive new data sets under a novel regulatory regime.

What the Agency Did

Through its June 24, 2026, notice, CARB formally acknowledged the need for adjustments to the initial rollout. The agency proposed extending the Scope 1 and Scope 2 reporting deadline by exactly three months. By moving the date from August 10, 2026, to November 10, 2026, CARB effectively granted covered entities a brief reprieve. The notice serves as a formal declaration of CARB's revised administrative schedule, recognizing the logistical hurdles facing both the regulators and the regulated community.

Alongside the deadline extension, CARB announced that it will pursue targeted revisions and clarifying amendments to the implementing regulations. The agency did not immediately publish the full text of these forthcoming amendments, but the notice confirms that regulatory staff are actively working to refine the rules governing how emissions data must be reported under SB 253 (California). The agency's dual action—delaying the deadline while promising rule revisions—demonstrates an administrative effort to align the reporting timeline with a finalized, unambiguous set of compliance standards.

How It May Be Applied

The immediate application of this delay is straightforward: companies scheduled to file emissions reports in August 2026 must now target November 10, 2026. Corporate boards and executive officers should treat November 10, 2026, as a hard deadline, despite this initial deferral. The extension provides a finite window to address data gaps and secure necessary audit opinions.

However, the forthcoming targeted revisions introduce a variable that compliance teams must manage carefully. If the clarifying amendments alter verification standards, reporting formats, or specific calculation methodologies, companies will need to use the three-month extension to align their existing data with the new regulatory expectations. The delay may also set a precedent for how CARB handles future deadlines under the statute. Regulated entities will likely use this extension to finalize third-party assurance contracts and conduct dry runs of their reporting systems. Legal departments will spend the autumn of 2026 cross-referencing their draft emissions reports against the targeted revisions CARB has promised to release.

Timeline Comparison

Milestone	Original Deadline	Revised Deadline
Scope 1 & 2 Reporting	August 10, 2026	November 10, 2026
Regulatory Status	Preliminary Rules	Awaiting Targeted Revisions

The Bottom Line

The California Air Resources Board has given corporations a three-month extension to comply with the state's new climate disclosure mandates. By moving the initial Scope 1 and Scope 2 reporting deadline from August 10, 2026, to November 10, 2026, the agency provides companies with additional time to prepare their data. The concurrent promise of targeted revisions to the implementing regulations suggests that the final rules governing these disclosures are still taking shape.

This article is general legal information and commentary about legal developments. It is not legal advice, does not address your specific situation, and is not a substitute for advice from a licensed attorney. Reading this article and contacting us through this website do not create an attorney-client relationship.

Sources & authorities

SB 253 (California) — source

CARB Delays SB 253 Scope 1 and Scope 2 Emissions Reporting to November

Key takeaways