In the New York Times, Theodore Schleifer and Erin Griffith have a report, “Inside the Billionaires’ War Against California’s Proposed Wealth Tax.” From the article:
Every Tuesday for the last few months, two dozen of the world’s richest people or their advisers hop onto a conference call and plan for war.
The war is against a proposed tax, but not just any tax. It is against a “wealth tax” on California billionaires, one that Silicon Valley’s most affluent see as an existential threat that could usher in a new way of attacking them. So in confidential memos, WhatsApp and Signal chats and conference calls, they are banding together to battle back.
The calls are organized by Building a Better California, a nonprofit started this year to fight Proposition 40, the ballot measure that would impose a one-time 5 percent tax on billionaires if voters approve it next week. Each week, the nonprofit’s operatives brief donors or their advisers on polling, advertising and opposition research. Often, the calls include an ask: Would you consider giving a little more?
Related TaxProf Blog coverage:
- TaxProf Blog Op-Ed: Galle et al. on “Tax Reform, Health Care Finance, and the Case for Prop 40” (Oct. 21, 2026)
- Jaros & Rauh: The Net Present Value of the California Billionaire Tax Act (Oct. 20, 2026)
- Economists (71%) and Accountants (85%) Oppose California’s Billionaire Tax; 60% of Tax Lawyers Support It (Oct. 18, 2026)
- Roundup: Changing Coalitions and California’s Billionaire Tax (Oct. 17, 2026)
- Nobel Laureates’ Support Letter for California Billionaire Tax (Sept. 22, 2026)
- California Budget & Policy Center: New Report on Proposed Billionaire Tax (Aug. 11, 2026)
- Newsom Floats Federal Wealth Tax After California Deal Fails (June 29, 2026)
- California’s Billionaire Tax Act Threatens Growth and Fails to Address Structural Deficits (June 24, 2026)
- California Billionaire Tax Qualifies for November Ballot (June 23, 2026)
- WSJ: Rich Californians Are Finding Creative Ways to Get Ahead of the Billionaire Tax (June 22, 2026)
- Saez and Zucman: The Case for California’s Billionaire Wealth Tax (May 27, 2026)
- Some Actual Facts on California’s Billionaire Tax (May 4, 2026)
- Galle, Gamage & Shanske: Correcting the Record: Responding to Some Legal Arguments About the 2026 Billionaire Tax Act (Jan. 9, 2026)



