On February 11, 2026, Governor Gavin Newsom stood in Sacramento’s Capitol Annex Swing Space and announced his stance on a slate of statewide propositions. Among them, he gave his seal of approval to Proposition 42 a ballot initiative that would erase the effects of the earlier Proposition 40—the so-called Billionaire Tax Act. If voters approve Prop 42, the one-time 5% levy on the assets of any billionaire residing in California as of Jan. 1, 2026 would be blocked, and a broader ban on future wealth taxes would be enacted.
The move surprised many within Newsom’s own Democratic Party and labor organizations, yet it aligns him with a powerful cohort of tech donors. The primary financier of Prop 42 is Google co-founder Sergey Brin who has spent millions to place the measure on the ballot. Brin’s involvement underscores a growing trend of Silicon Valley magnates influencing state fiscal policy, especially when proposals threaten their own financial interests.
What Proposition 42 actually does
Proposition 42 is structured as a two-pronged protection. First, it bars any retroactive tax that would be applied to personal wealth held before a law’s passage. That means the 5% tax envisioned by Prop 40—targeting stocks, investment accounts, business holdings, art collections, and even pre-retirement 401(k) balances—could never be levied on assets accumulated prior to the measure’s enactment. Second, the initiative places a permanent prohibition on new taxes that target personal property, effectively outlawing future wealth or “rich-person” taxes in California. Supporters argue that the measure safeguards retirement savings and other personal assets from double taxation, while critics contend it is a thinly veiled effort to protect the ultra-wealthy.
Political backdrop and the key players
The billionaire tax proposal, Prop 40, was championed by a coalition led by a healthcare union that pledged to route 90% of the anticipated revenue to Medi-Cal, California’s low-income health-care program. The measure has enjoyed backing from the California Democratic Party and a handful of progressive lawmakers. Yet the governor’s endorsement of the counter-measure aligns him with Brin’s campaign and other wealthy benefactors who have cultivated long-standing relationships with Newsom dating back to his tenure as San Francisco mayor.
Labor response has been fierce. Debru Carthan, vice president of the Service Employees International Union-United Healthcare Workers West, blasted Newsom’s vote as “in lock step with his billionaire backers,” accusing the governor of favoring a handful of wealthy individuals over millions of children and families who rely on Medi-Cal. Meanwhile, other unions, including police and fire groups, have signed onto the Prop 42 campaign, arguing that no Californian should see retirement savings taxed before those savings are ever drawn as income.
Labor union paradox
The split among labor organizations highlights a paradox: while many unions oppose tax measures that could burden workers, some see the billionaire tax as a means to fund essential services for low-income residents. The Service Employees International Union-United Healthcare Workers West remains a vocal opponent of Prop 42, whereas other public-sector unions have joined the “protect-retirement-savings” narrative presented by the measure’s proponents.
Implications for California’s tax landscape
If Prop 42 outpaces Prop 40 in the November ballot, the state would effectively shelve the proposed wealth tax, preserving the status quo of income-based taxation. Such an outcome could embolden future attempts to block progressive tax ideas, reinforcing a fiscal environment that relies heavily on corporate and income taxes while leaving wealth accumulation largely untaxed. Newsom, who has previously warned that high-wealth individuals might flee the state, may view Prop 42 as a strategic shield to retain California’s tax base.
Beyond the immediate ballot, the controversy fuels a broader national conversation. Earlier this summer, Newsom floated a federal “minimum wealth tax” targeting net worths above $100 million, signaling his willingness to pursue wealth-tax policies at the national level while blocking them at home. The juxtaposition of a state-level block and a federal push creates a complex political calculus for the governor as he eyes potential future runs for higher office.
