On Feb. 26, 2026, CARB adopted its initial regulations implementing SB 253 and SB 261, the California Greenhouse Gas Reporting and Climate Financial Risk Disclosure Initial Regulation.
The adopted rulemaking is brief but establishes an initial, first-year-only reporting deadline of Aug. 10, 2026, for Scope 1 and Scope 2 emissions reporting under AB253, includes several clarifying definitions, and describes CARB’s process for assessing and collecting flat fees from covered businesses and enforcing failures to timely remit payments. CARB’s adopted regulations are virtually identical to those it first proposed in December 2025.