California climate disclosure laws explained: SB 253, SB 261 and what large companies need to report
California SB 253 and SB 261 explained: who is in scope, what emissions and climate-risk reports cover, what SB 219 changed, and what companies should check next.
California's climate disclosure laws move corporate climate reporting from voluntary sustainability language into a legal evidence system. Senate Bill 253 (SB 253) focuses on Scope 1, Scope 2 and Scope 3 greenhouse gas emissions. Senate Bill 261 (SB 261) focuses on climate-related financial risk.
Information only
This guide is for general information only. It is not legal, accounting, regulatory, investment or financial advice. Companies should check current California Air Resources Board (CARB) guidance, litigation status and professional advice before making compliance decisions.
The common mistake is to treat California's rules as one more sustainability report. They are more important than that. SB 253 and SB 261 create two linked tests: can a large company produce emissions data across its value chain, and can it explain how climate risk affects financial outcomes?
That distinction matters because the pressure does not stop at companies headquartered in California. The laws use a doing-business-in-California concept and revenue thresholds. That means large public companies, private companies, parent groups and suppliers may all need to understand the reporting architecture, even if the final compliance answer depends on current rules and advice.
The central point is this: California is not only asking companies to publish climate information. It is testing whether climate information is controlled well enough to be reported, assured, compared and challenged.
That makes the laws part of the wider environmental, social and governance (ESG) reporting shift: sustainability information is becoming harder to separate from finance, risk, audit and legal accountability.
Quick answer
| Question | Short answer |
|---|---|
| What are California's climate disclosure laws? | SB 253 is the Climate Corporate Data Accountability Act for emissions disclosure. SB 261 is the climate-related financial risk reporting law. |
| Who is in scope? | SB 253 applies to reporting entities with more than $1 billion in total annual revenue that do business in California. SB 261 applies to covered entities with more than $500 million in total annual revenue that do business in California, with insurance exclusions. |
| What does SB 253 require? | Annual public disclosure of Scope 1, Scope 2 and Scope 3 greenhouse gas emissions, measured using Greenhouse Gas Protocol standards and guidance, with assurance requirements for Scope 1 and Scope 2. |
| What does SB 261 require? | A public climate-related financial risk report every two years, based on Task Force on Climate-related Financial Disclosures (TCFD) recommendations or an equivalent reporting requirement. |
| What changed under SB 219? | SB 219 adjusted implementation mechanics, including the California Air Resources Board (CARB) regulation deadline, Scope 3 scheduling, parent-level consolidation and possible reporting to CARB or a reporting organization. |
Data checked
This guide was checked on 17 June 2026 against official California Legislative Information bill text for SB 253, SB 261 and SB 219, plus Greenhouse Gas Protocol and climate-disclosure standard sources. CARB implementation guidance, reporting portals, court decisions and detailed timetables can change the practical compliance picture.
The numbers to know
| Number or date | Where it fits | Why it matters |
|---|---|---|
| More than $1 billion | SB 253 revenue threshold | The emissions law targets very large reporting entities doing business in California. |
| More than $500 million | SB 261 revenue threshold | The climate-risk law reaches a wider group of large covered entities, subject to exclusions. |
| 2026 | SB 253 Scope 1 and Scope 2 start year in the statute | Large reporting entities need direct operations and purchased-energy emissions data that can stand up to assurance. |
| 2027 | SB 253 Scope 3 start year in the statute | Value-chain data becomes the harder reporting problem because it depends on suppliers, customers, logistics and estimates. |
| Up to $500,000 | SB 253 annual penalty cap in the statute | The emissions law has a much larger penalty ceiling than the risk-reporting law. |
| Up to $50,000 | SB 261 annual penalty cap in the statute | The risk-reporting law still creates a formal compliance exposure, even though the cap is lower. |
The sticky number is the threshold gap. SB 253 starts at more than $1 billion in revenue. SB 261 starts at more than $500 million. That means a company may need to think about climate-risk reporting even if it is below the emissions-disclosure threshold.
SB 253 vs SB 261
The two laws are often discussed together, but they do different jobs. SB 253 is about measuring and disclosing emissions. SB 261 is about explaining climate-related financial risk.
| Feature | SB 253 | SB 261 |
|---|---|---|
| Main job | Public greenhouse gas emissions disclosure. | Public climate-related financial risk reporting. |
| Revenue threshold | More than $1 billion in total annual revenue. | More than $500 million in total annual revenue. |
| California link | Doing business in California. | Doing business in California. |
| Core content | Scope 1, Scope 2 and Scope 3 emissions. | Physical and transition risks that could harm financial outcomes, plus measures to reduce or adapt to those risks. |
| Reporting lens | Greenhouse Gas Protocol standards and guidance, unless an alternative standard is adopted later. | TCFD recommendations, successor framework or equivalent reporting requirement. |
| Assurance | Scope 1 and Scope 2 limited assurance from 2026 and reasonable assurance from 2030 under the statute. Scope 3 limited assurance can begin from 2030 if CARB establishes it. | The statute is about public risk reporting, not emissions assurance. |
| Public visibility | Public emissions disclosures through the reporting structure set by CARB. | Climate-related financial risk report made publicly available on the company's own website. |
The practical difference is simple. SB 253 asks whether the emissions number is measured and supported. SB 261 asks whether the company understands what climate change and the transition could do to its financial position, operations, supply chain, investments or demand.
What SB 219 changed
SB 219 is important because it changed several implementation details after SB 253 and SB 261 were signed. It did not remove the basic architecture. It made the machinery more flexible.
| Area | SB 219 effect | Why it matters |
|---|---|---|
| Regulation timing | CARB's regulation deadline for SB 253 became 1 July 2025. | The statutory design moved into a CARB implementation phase. |
| Where SB 253 reports go | Reports can go to the emissions reporting organization if one is contracted, or to CARB. | Companies should not assume the reporting channel until current CARB guidance is checked. |
| Scope 3 schedule | Scope 3 disclosure starts in 2027, but the schedule is to be specified by CARB. | The value-chain timetable is not only a fixed 180-day rule from the original text. |
| Parent consolidation | Reports may be consolidated at parent-company level where the statute allows. | Groups need to map entity structure, subsidiaries and revenue thresholds carefully. |
| SB 261 equivalent reporting | SB 219 added International Sustainability Standards Board (ISSB) Sustainability Disclosure Standards as one possible equivalent reporting route. | California risk reporting now sits closer to the global investor-focused disclosure baseline. |
That is why a company should not read the original SB 253 text in isolation. The live compliance question starts with the statute as amended, then moves to CARB implementation and current legal status.
Why California's rules matter beyond California
California's economy is large enough that a state-level rule can behave like a market-level rule. A company does not need to be a California brand to care. The practical trigger is whether a business is large enough, does business in California and fits the statutory definition after current guidance and advice are applied.
That makes the law relevant to several groups:
- large private companies that may not be caught by public-company climate disclosure regimes;
- public companies already preparing emissions, risk and investor disclosures;
- parent groups that need to understand whether consolidated reporting is possible;
- suppliers asked for emissions data by customers that may be in scope;
- finance, legal, audit, risk and sustainability teams that need one evidence file rather than separate narratives.
The supplier effect is especially important. SB 253 includes Scope 3 emissions, which means a reporting entity may need information from companies that are not directly in scope. For smaller suppliers, the first encounter with California climate disclosure may not be a regulator. It may be a customer questionnaire.
What companies control, share and depend on
The hardest work is not writing the final report. It is deciding which parts of the evidence chain the company controls directly, which parts it shares with others and which parts depend on estimates.
| Evidence area | Control level | Practical implication |
|---|---|---|
| Scope 1 fuel, refrigerants and owned operations | High control | Finance, facilities and operations teams should be able to trace data to bills, meters, logs or asset records. |
| Scope 2 purchased energy | High to medium control | Companies need electricity and energy records, locations, market-based instruments and method documentation. |
| Scope 3 suppliers, logistics, product use and travel | Shared or low direct control | The evidence file needs supplier data, reasonable estimates, calculation methods and a plan to improve data quality. |
| Climate-related financial risk | Shared across governance, finance and risk | The report should connect climate risks to operations, supply chain, assets, demand, capital, insurance and resilience. |
| Public claims and investor materials | High control | Marketing, annual-report and investor language should not outrun the underlying emissions and risk evidence. |
A simple example
Imagine a fictional electronics company, Ridgeway Devices. It has $1.3 billion in annual revenue, sells into California, has a parent company with several subsidiaries and relies on contract manufacturers across Asia and North America.
Under SB 253, the obvious data is not enough. Ridgeway may have good Scope 1 data for company vehicles and facilities, and Scope 2 data for purchased electricity. The harder problem is Scope 3: purchased components, outsourced manufacturing, freight, business travel, product use and end-of-life treatment. The company needs a method that can use primary supplier data where possible and documented estimates where supplier data is weak.
Under SB 261, the question changes. Ridgeway must think about climate-related financial risk: heat disruption in supplier regions, flood exposure at logistics hubs, carbon-cost exposure in materials, customer demand for lower-carbon products, energy-price volatility and the cost of redesigning products or supply chains.
The same company therefore needs two linked workstreams. One produces emissions data. The other explains how climate risk could affect the business. The overlap is where the real governance test sits: can finance, legal, risk, procurement and sustainability teams explain the same story with the same evidence?
How this fits with TCFD, ISSB and CSRD
California's laws sit inside a crowded reporting landscape, but they are not identical to the European Union's Corporate Sustainability Reporting Directive (CSRD), the International Sustainability Standards Board (ISSB) baseline or UK climate disclosure rules.
SB 261 is closest in shape to disclosure based on the Task Force on Climate-related Financial Disclosures (TCFD) because it asks for climate-related financial risk and measures adopted to reduce or adapt to that risk. The TCFD structure also lives on inside International Financial Reporting Standard S2 (IFRS S2) and other climate disclosure regimes.
SB 253 is closer to the emissions-data layer. It pushes companies toward a public greenhouse gas inventory covering direct emissions, purchased energy and value-chain emissions. That connects naturally to the Greenhouse Gas Protocol and to reporting regimes that ask for Scope 1, Scope 2 and Scope 3 evidence.
CSRD is broader because it uses double materiality and covers a wider set of sustainability topics. ISSB is investor-focused and built around sustainability-related financial disclosure. California's laws are narrower in topic but powerful because they apply by revenue and California business connection, not only by listing venue.
What a readiness file should contain
The safest first step is not a glossy sustainability report. It is a readiness file that proves the company knows its scope, data, owners and gaps.
- entity structure, parent company and subsidiary map;
- California business-nexus review and revenue-threshold analysis;
- emissions boundary and consolidation approach;
- Scope 1 and Scope 2 activity data sources;
- Scope 3 category map, assumptions and supplier-data plan;
- assurance-provider readiness and evidence controls;
- climate-risk register linked to operations, supply chain, assets and finance;
- governance owners across finance, risk, legal, audit, procurement and sustainability;
- public website and report-publication process;
- claims review so public sustainability language matches the evidence.
That file does not decide every legal question. It gives decision-makers something solid to work from when CARB guidance, assurance expectations, legal status or customer requests change.
Public claims risk
California climate disclosure also changes the claims environment. Once emissions and climate-risk information become more public, broad claims about climate leadership, low-carbon products, net zero readiness or resilient supply chains become easier to test against reported data.
That does not mean companies should stop communicating. It means claims need narrower boundaries and better evidence. If a company says it is reducing emissions, readers should be able to see which scope, which baseline, which method and which part of the value chain is included. If a company says it is resilient to climate risk, the risk report should not describe severe exposures with no credible response.
The reporting lesson and the green-claims lesson are the same: evidence comes before language.
Bottom line
California's climate disclosure laws are best understood as a two-part accountability system. SB 253 asks large companies to disclose emissions across operations, purchased energy and value chains. SB 261 asks large companies to explain climate-related financial risk.
The strongest companies will not treat that as two separate reports. They will treat it as one evidence problem: who is in scope, what data exists, who owns the risk, what can be assured, and whether the public story matches the underlying facts.
FAQ
Are SB 253 and SB 261 the same law?
No. SB 253 is the emissions-disclosure law. SB 261 is the climate-related financial risk reporting law. They overlap in audience and governance, but they ask different reporting questions.
Does SB 253 require Scope 3 emissions?
Yes. The statute covers Scope 1, Scope 2 and Scope 3 emissions. Scope 3 reporting starts in 2027 under the statute, with the schedule specified by CARB as part of implementation.
Do California climate disclosure laws apply to private companies?
They can. The statutory thresholds refer to business entities with specified total annual revenue that do business in California, rather than only to public companies. The exact scope should be checked against current guidance and advice.
Is TCFD still relevant to SB 261?
Yes. SB 261 references the Task Force on Climate-related Financial Disclosures recommendations or an equivalent reporting requirement. TCFD remains useful because its governance, strategy, risk management, and metrics and targets structure still shapes climate-risk reporting.
Can an ISSB report help with SB 261?
Potentially. SB 219 added ISSB Sustainability Disclosure Standards as one possible equivalent reporting route for climate-related financial risk reporting. Companies still need to check whether their report satisfies current California requirements.
What should companies do first?
Start with scoping and evidence. Map entities, revenue thresholds, California nexus, emissions boundaries, data owners, Scope 3 suppliers, climate-risk governance and public-reporting processes before drafting the final disclosure.
Useful source links
- California Legislative Information: SB 253 Climate Corporate Data Accountability Act
- California Legislative Information: SB 261 climate-related financial risk
- California Legislative Information: SB 219 amendments
- Greenhouse Gas Protocol: standards and guidance
- IFRS Foundation: IFRS S1 General Requirements
- IFRS Foundation: IFRS S2 Climate-related Disclosures
- Task Force on Climate-related Financial Disclosures: recommendations
- Wikimedia Commons: California State Capitol image by Andre m, CC BY-SA 3.0
