California Climate Disclosure SB 253 and SB 261: 2026 Compliance Guide
If your company does business in California — and your annual revenue exceeds $500 million — federal climate disclosure debates are no longer your only concern. California’s SB 253 and SB 261 climate disclosure laws are now in force, with first-year reporting obligations landing in 2026. The laws apply regardless of your company’s incorporation state or headquarters, capturing many US private companies and public companies that previously dodged direct climate reporting obligations.
At SW Accounting & Consulting Corp, we work with California-active businesses on multistate compliance, ESG reporting framework selection, and the data infrastructure required for Scope 1-3 emissions disclosure. This guide walks through the two laws’ scope, the reporting thresholds, what gets reported, and what to do now if you’re in scope.
What is California SB 253 — the Climate Corporate Data Accountability Act? 📊
SB 253 requires companies with annual revenue above $1 billion that “do business in California” to publicly disclose Scope 1, Scope 2, and Scope 3 greenhouse gas emissions — using accepted protocols and with progressive third-party assurance requirements.
| SB 253 Element | Detail |
|---|---|
| Revenue threshold | Annual revenue > $1 billion |
| Nexus | “Do business in California” — broad standard |
| Scope 1 emissions | Direct emissions from owned/controlled sources (vehicles, facilities, equipment) |
| Scope 2 emissions | Indirect emissions from purchased electricity, steam, heating, cooling |
| Scope 3 emissions | All other indirect emissions in value chain (suppliers, customer use, transportation, waste) |
| Reporting framework | GHG Protocol (the global standard) |
| Assurance | Phased — limited assurance initially, reasonable assurance later |
| Penalties | Up to $500,000 per reporting year for non-compliance |
Scope 3 is where most US companies will struggle. It captures emissions from your entire value chain — every supplier’s production process, every customer’s product use, every freight movement. Data gathering is non-trivial, particularly for global supply chains.
What is California SB 261 — the Climate-Related Financial Risk Act? 🌡
SB 261 requires companies with annual revenue above $500 million that do business in California to publish biennial climate-related financial risk reports — describing the physical and transition risks climate change poses to the company’s operations and financial condition.
| SB 261 Element | Detail |
|---|---|
| Revenue threshold | Annual revenue > $500 million |
| Reporting cycle | Biennial (every 2 years) |
| Content — physical risks | Acute (extreme weather, wildfire) and chronic (sea level, drought, heat) climate impacts on operations |
| Content — transition risks | Policy, technology, market, reputation risks from the shift to a lower-carbon economy |
| Recommended framework | TCFD (Task Force on Climate-related Financial Disclosures) and IFRS S2 |
| Publication | Public — typically on company website |
| Penalties | Up to $50,000 per reporting year for non-compliance |
SB 261 requires narrative climate-risk analysis tied to your operations and financial statements — not just emissions numbers. You need scenario analysis, climate modeling alignment, transition-risk inventory, and integration with financial planning. The $500M threshold also captures a larger universe of companies than SB 253’s $1B. Many US mid-cap private companies will hit SB 261 first, often without prior climate-reporting infrastructure.
Who counts as “doing business in California”? 🏛
California’s “doing business” standard is broad — even non-California-headquartered companies with material California sales, payroll, or property generally qualify. The Franchise Tax Board’s general doing-business thresholds (per R&TC § 23101) inform but don’t fully control the SB 253/SB 261 nexus.
Common triggers for “doing business in California”:
- California payroll exceeds the FTB’s annual threshold (currently around $69,000+ indexed).
- California sales exceed the threshold (around $690,000+ indexed).
- California property exceeds the threshold (around $69,000+).
- Active solicitation, employees, distribution, or customer service operations in California.
- Registration with the California Secretary of State to do business.
If you cross the SB 253 or SB 261 revenue threshold AND have substantial California business activity, assume you’re in scope until counsel confirms otherwise.
What about the federal SEC climate rule? 🇺🇸
The SEC’s federal climate disclosure rule has been delayed, challenged, and partially vacated through 2025. California’s SB 253/SB 261 are state-level and continue to apply regardless of the federal rule’s status. For California-active companies, federal uncertainty doesn’t excuse state compliance.
Practical implications:
- SEC federal rule: Status remains uncertain after litigation challenges. Don’t wait for federal clarity before building California compliance.
- SB 253/SB 261: California law, enforced by the California Air Resources Board (CARB). State-level enforcement is independent of federal rulemaking.
- EU CSRD: For US companies with EU subsidiaries or large EU operations, CSRD is a separate disclosure regime with its own timeline.
- IFRS S1/S2: Voluntary or required in many other jurisdictions; complementary to California regime.
What should in-scope companies do now? ✅
- Confirm in-scope status. Run revenue and California nexus analyses. The $500M (SB 261) and $1B (SB 253) thresholds capture more companies than expected — including many private companies that previously had no climate reporting obligation.
- Inventory existing climate data. Many companies have ESG data scattered across sustainability reports, supplier surveys, ERP systems, and utility bills. Aggregate what you have before estimating gaps.
- Select reporting frameworks. GHG Protocol for emissions (SB 253) and TCFD/IFRS S2 for climate risk (SB 261). Choosing consistent global frameworks future-proofs against CSRD and other jurisdictions.
- Build Scope 3 data infrastructure. Scope 3 is the hardest. Engage suppliers, set data-gathering protocols, consider third-party platforms for emissions calculation.
- Scenario analysis for SB 261. Develop physical and transition risk scenarios aligned with your operations. Consider 1.5°C, 2°C, and 3°C+ pathways. Document the modeling assumptions.
- Coordinate with audit and counsel. SB 253 phased assurance means external assurance providers (often audit firms) will be involved. Engage early.
- Watch CARB rulemaking. California Air Resources Board has been issuing implementation guidance. Monitor for filing portal, exact deadlines, and disclosure format requirements.
Frequently Asked Questions 🗂
For California Air Resources Board rulemaking and implementation guidance, see arb.ca.gov. The full statutory text of SB 253 and SB 261 is available through the California Legislative Information portal. The GHG Protocol (the standard for Scope 1/2/3 measurement) and IFRS S2 (climate financial risk) are at ghgprotocol.org and ifrs.org respectively.
Need help confirming in-scope status, building Scope 1-3 data infrastructure, drafting climate-risk narratives, or coordinating SB 253/SB 261 with EU CSRD reporting? SW Accounting & Consulting Corp’s ESG reporting team supports California-active companies — book a consultation.
