CSRD vs SB 253: what every multinational needs to know

If your company has operations in both the European Union and California, you're staring down two separate — but overlapping — carbon disclosure mandates: the EU's Corporate Sustainability Reporting Directive (CSRD) and California's Senate Bill 253 (the Climate Corporate Data Accountability Act).

Both require greenhouse gas reporting. Both carry real penalties. But they differ significantly in who they target, what they require, and when the deadlines hit. Understanding the gap between them is essential for any multinational compliance strategy. Treating them as interchangeable is a mistake that will cost you time and money.

Who's affected

The scope of these two regulations is dramatically different — and that's where most confusion starts.

EU CSRD applies to roughly 50,000+ companies. It covers all large EU companies, listed SMEs on EU-regulated markets, and — critically for multinationals — non-EU companies with over €150M in EU net turnover that have at least one EU subsidiary or branch. The net is wide. If you generate significant revenue in Europe, you're likely in scope even if you're headquartered in the U.S.

California SB 253 is narrower in count but aggressive in reach. It applies to U.S.-based companies (public or private) with annual revenues exceeding $1 billion that "do business in California." California interprets that broadly — having customers, employees, or operations in the state typically qualifies. Roughly 5,000+ companies are estimated to be in scope.

What's required: double materiality vs. emissions only

This is the most significant structural difference between the two frameworks.

CSRD requires "double materiality" reporting. Companies must disclose both how sustainability issues affect the business (financial materiality) and how the business impacts the environment and society (impact materiality). The reporting covers environmental, social, and governance topics under the European Sustainability Reporting Standards (ESRS) — including climate change, biodiversity, workforce conditions, and supply chain due diligence. It's comprehensive by design.

SB 253 is emissions-focused. It mandates annual disclosure of Scope 1, 2, and 3 greenhouse gas emissions using the GHG Protocol as the methodological baseline. There's no broader ESG reporting requirement — no social metrics, no governance disclosures. It's purely about carbon.

• CSRD: ~1,000+ data points across ESRS topics (climate, pollution, water, biodiversity, workforce, supply chain, governance)
• SB 253: Scope 1, Scope 2, and Scope 3 GHG emissions — disclosed to a CARB-designated registry

For companies subject to both, the CSRD data set is a superset. A complete CSRD report will contain the emissions data SB 253 requires — but not the other way around. See the full SEC + climate disclosure guide →

Timeline comparison

Penalties and enforcement

SB 253 penalties are explicit and escalating. Non-compliance with Scope 1 and 2 disclosure carries penalties up to $500,000 per reporting year. Scope 3 non-disclosure triggers up to $50,000 per day — designed as an escalating motivator. A 90-day delay on Scope 3 means up to $4.5M in theoretical exposure. Enforcement is via the California Air Resources Board (CARB). Calculate your specific penalty exposure →

CSRD penalties vary by EU member state, because enforcement is implemented through national transposition laws. In practice, non-compliance can result in financial fines, auditor qualifications on annual reports, director personal liability, and — perhaps most impactful — exclusion from public procurement and investment mandates that increasingly require CSRD-aligned disclosures. The reputational cost in Europe may exceed the legal penalties.

The key takeaway: multinational companies need both

If your company has EU operations (or significant EU revenue) and does business in California with $1B+ revenue, treating these as separate workstreams is the expensive path. They share a common data foundation — GHG emissions — but diverge on scope, format, and filing.

The smart approach:

• Build one emissions data infrastructure that satisfies the GHG Protocol methodology (required by both)
• Layer CSRD-specific ESRS disclosures on top for the broader sustainability topics SB 253 doesn't require
• Engage assurance providers early — both frameworks require third-party assurance, and capacity is constrained through 2027
• Prioritize SB 253 Scope 1+2 first (due August 2026) while building toward CSRD's broader requirements on a parallel track

Companies that start with a single, rigorous GHG inventory — covering all three scopes — save significant time and cost versus running parallel compliance projects. The emissions data is the foundation. Everything else builds on top of it. See the complete Scope 3 calculation guide →

Read the SB 253 deep-dive → for a detailed breakdown of California-specific deadlines, penalties, and the 90-day action plan.