California Climate Rules Spark Banking Clash

U.S. Department of the Treasury seal over American flag — Photo: chrisdorney / Shutterstock

A federal banking regulator just told California its climate rules could push national banks to pull back services or leave the state entirely.

Story Snapshot

The Office of the Comptroller of the Currency (OCC) sent a letter to California regulators on October 29 asking them to exempt national banks from two climate-disclosure laws.
The OCC warns the state rules could conflict with federal banking law and raise costs for customers.
California’s own planning documents list banking and finance companies among the industries the laws cover.
The clash taps into a 200-year-old legal fight over whether states can regulate federally chartered banks.

Federal Regulator Challenges State Climate Rules

The Office of the Comptroller of the Currency, part of the U.S. Treasury Department, sent a letter to the California Air Resources Board on October 29. The letter asks the board to exempt national banks and federal savings associations from two state climate-disclosure laws, or make clear those banks don’t have to comply at all.

The two laws at issue require large companies doing business in California to report their greenhouse gas emissions and disclose climate-related financial risks. The first reporting deadline for the biggest companies lands November 10, following final approval of the rules on October 12.

Comptroller Jonathan Gould said applying the laws to federally chartered banks raises “serious policy and legal concerns.” His letter argues the rules could clash with existing federal banking regulations and disrupt how banks serve customers across state lines, not just in California.

The Trump administration’s Treasury Department framed the fight in blunt terms, warning that forcing banks to comply could leave consumers facing “stiff consequences” if institutions scale back operations or leave the state.

California’s Own Records Show Banks Were Included

California’s planning documents tell a different story about who the laws were built to cover. Air Resources Board workshop slides from July 2026 list banking and related financial businesses among the sectors affected by the emissions-reporting law.

Listening-session materials from August and September repeat that same list, naming banking, finance, insurance, fintech, and capital-markets companies as covered entities. The board defines a “reporting entity” simply as a U.S.-formed business making over $1 billion a year that does business in California — with no carve-out for federally chartered banks.

California’s published exemption list covers nonprofits, insurers, government entities, and companies that only handle wholesale electricity sales. National banks and federal savings associations don’t appear anywhere on that list. That gap is exactly what the OCC wants closed, but through federal override rather than state rulemaking.

A Decades-Old Legal Fight Resurfaces

This isn’t the first time Washington and a state have fought over who controls national banks. The Supreme Court has sided with federal authority in similar cases going back to the 1819 ruling in McCulloch v. Maryland, which held that states can’t control institutions created under federal law.

More recent rulings, including Barnett Bank v. Nelson and Watters v. Wachovia, reinforced that federally authorized bank powers are usually protected from state laws that get in the way of them. The real legal question is narrower than the political fight suggests: does California’s rule regulate a bank’s federally approved powers, or is it just a general business reporting rule that happens to reach banks too?

The @USOCC just told California that two of its climate disclosure laws should not reach national banks.

In a letter to @AirResources, Comptroller Jonathan Gould (@USComptroller) argued the laws would be "inconsistent with OCC regulation and safety and soundness" and would… https://t.co/f09GsqGAsT

— Chris Nobili (@chrisnobili) October 30, 2026

That distinction will likely decide whether courts ultimately back the OCC’s position or let California’s rule stand as written. For now, no lawsuit has been filed, and California has not publicly responded to the OCC’s letter.

Why This Fight Matters Beyond Banking

For conservatives frustrated with what they see as costly, one-size-fits-all climate mandates, the OCC’s move looks like a federal check on state overreach. For liberals wary of corporate accountability being rolled back, it looks like Washington shielding big banks from basic disclosure rules. Both camps share a deeper worry: that regulators, not elected lawmakers, are deciding how these fights play out.

Whatever happens next, the dispute shows how a single state law can ripple into a national fight over who actually controls the rules banks live by. Millions of customers who bank with national institutions could feel the effects long before any court settles the underlying legal question.