Key Takeaways
- • California Air Resources Board (CARB) deferred the first SB 253 GHG reporting deadline from August 10, 2026 to November 10, 2026—a three-month extension to allow regulatory clarification before compliance obligations take effect.
- • CARB withdrew its previously submitted regulations and will issue a new draft with "limited amendments" designed to clarify reporting requirements, followed by a 15-day public comment period before final resubmission to the Office of Administrative Law.
- • SB 253 affects all U.S.-based companies with annual revenues exceeding $1 billion that do business in California; the 2026 reporting cycle covers Scope 1 and Scope 2 emissions only, with Scope 3 reporting mandated beginning in 2027.
- • The extension provides additional time for covered companies to refine emissions inventories, validate data collection systems, and establish governance and assurance processes, though regulatory revisions may reshape compliance expectations.
- • Companion legislation SB 261 (climate-related financial risk reporting) remains stayed pending litigation before the U.S. Court of Appeals for the Ninth Circuit and does not affect the SB 253 timeline.
Summary
On June 24, 2026, the California Air Resources Board announced a three-month deferral of the initial corporate greenhouse gas reporting deadline under SB 253, pushing the first compliance date from August 10 to November 10, 2026. The extension accommodates regulatory revisions CARB is undertaking to clarify key compliance requirements. Rather than delay, CARB characterized the move as necessary refinement to provide reporting entities with greater certainty on their obligations before disclosures become due.
SB 253, codified in California Health and Safety Code § 38532, establishes one of the nation's most comprehensive corporate climate disclosure mandates. The law applies to all U.S.-based companies with total annual revenues exceeding $1 billion that conduct business in California. The initial 2026 reporting cycle requires disclosure of Scope 1 (direct) and Scope 2 (purchased energy) emissions for the prior fiscal year. Beginning in 2027, companies must additionally report Scope 3 (value chain) emissions—a requirement that expands the reporting burden substantially and remains unaffected by the current deadline extension.
CARB's announcement indicates that the agency formally withdrew regulations it had previously submitted to the Office of Administrative Law and will release an amended draft containing targeted clarifications. The revised package will undergo a 15-day public comment period before CARB resubmits final regulations for approval. The agency emphasized that the extension should not be interpreted as a retreat from California's climate disclosure framework; rather, SB 253 remains fully operative, and the deferral simply provides affected companies with additional runway to finalize compliance infrastructure.
For reporting entities, the additional three months present an opportunity to strengthen data collection systems, validate emissions inventories, and establish internal governance and audit processes. However, the forthcoming regulatory amendments may introduce new compliance requirements or reinterpret existing obligations, necessitating close monitoring during the public comment period. Companies should anticipate that CARB's clarifications will offer critical guidance on reporting mechanics, data standards, and administrative procedures that have remained ambiguous during the preparation phase.
The extension applies solely to the first-year Scope 1 and Scope 2 reporting deadline. The statutory timeline for Scope 3 disclosure in 2027 appears unaffected. Additionally, SB 261, which mandates climate-related financial risk reporting, remains stayed pending ongoing litigation in the U.S. Court of Appeals for the Ninth Circuit and does not alter the SB 253 timeline. Boards and senior management at affected organizations should monitor regulatory developments through November to ensure compliance strategies align with CARB's final rules.
SB 253, codified in California Health and Safety Code § 38532, establishes one of the nation's most comprehensive corporate climate disclosure mandates. The law applies to all U.S.-based companies with total annual revenues exceeding $1 billion that conduct business in California. The initial 2026 reporting cycle requires disclosure of Scope 1 (direct) and Scope 2 (purchased energy) emissions for the prior fiscal year. Beginning in 2027, companies must additionally report Scope 3 (value chain) emissions—a requirement that expands the reporting burden substantially and remains unaffected by the current deadline extension.
CARB's announcement indicates that the agency formally withdrew regulations it had previously submitted to the Office of Administrative Law and will release an amended draft containing targeted clarifications. The revised package will undergo a 15-day public comment period before CARB resubmits final regulations for approval. The agency emphasized that the extension should not be interpreted as a retreat from California's climate disclosure framework; rather, SB 253 remains fully operative, and the deferral simply provides affected companies with additional runway to finalize compliance infrastructure.
For reporting entities, the additional three months present an opportunity to strengthen data collection systems, validate emissions inventories, and establish internal governance and audit processes. However, the forthcoming regulatory amendments may introduce new compliance requirements or reinterpret existing obligations, necessitating close monitoring during the public comment period. Companies should anticipate that CARB's clarifications will offer critical guidance on reporting mechanics, data standards, and administrative procedures that have remained ambiguous during the preparation phase.
The extension applies solely to the first-year Scope 1 and Scope 2 reporting deadline. The statutory timeline for Scope 3 disclosure in 2027 appears unaffected. Additionally, SB 261, which mandates climate-related financial risk reporting, remains stayed pending ongoing litigation in the U.S. Court of Appeals for the Ninth Circuit and does not alter the SB 253 timeline. Boards and senior management at affected organizations should monitor regulatory developments through November to ensure compliance strategies align with CARB's final rules.
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