Newsom Endorses Prop 42 to Block California Billionaire Tax, Defying Democratic Party

Key points

• Newsom endorsed Prop 42, which would ban taxes on personal property like pensions and 401(k)s, effectively killing Prop 40.
• Prop 42 is funded by Google co-founder Sergey Brin, who has cut ties with California in anticipation of the tax.
• The California Democratic Party and labor unions oppose Newsom’s stance, criticizing him for siding with billionaire donors.
• Opponents of the billionaire tax have raised over $300 million, far exceeding the $32.4 million raised by supporters.
• Polls show a slim 52% support for Prop 40, but Prop 42 has higher support, potentially blocking the tax regardless of Prop 40’s outcome.

Background

In September 2026, a Public Policy Institute poll showed 52% support for Prop 40, but Brin-funded measures Prop 41 and 42 had higher support. Earlier coverage noted that Newsom opposed the tax, warning it could drive wealth out of the state, while progressives argued it was necessary to offset federal healthcare cuts. The November 2026 ballot includes multiple tax measures across California, Colorado, and Washington, highlighting a national debate on wealth taxation.

How outlets are covering it

CalMatters and ABC News emphasize the political conflict: Newsom’s endorsement of Prop 42 contradicts the California Democratic Party and labor unions, which support Prop 40. ABC News notes that opponents, including Planned Parenthood and the California Teachers Association, have raised over $300 million to defeat the tax, with nearly a third from Sergey Brin. Politico focuses on the logistical challenges of implementing the tax, noting that the Franchise Tax Board would need to value global assets and determine residency for billionaires who may be fleeing the state. While CalMatters and ABC News highlight the political and financial disparity, Politico underscores the practical difficulties of enforcing a wealth tax, suggesting that even if passed, the measure could face significant legal and administrative hurdles.

Why it matters

The outcome of these ballot measures will determine whether California imposes a one-time 5% tax on billionaires to fund healthcare and education. Newsom’s endorsement of Prop 42 could block the tax entirely, despite majority support for Prop 40. The massive spending disparity and potential for wealth migration could impact California’s budget and influence national debates on wealth taxation. If Prop 42 passes, it would ban future wealth taxes, limiting the state’s ability to address healthcare funding gaps.

What to watch

Voters will decide on Prop 40, 41, and 42 in the November 2026 general election. If Prop 42 passes, it would nullify Prop 40 and ban future wealth taxes. If Prop 40 passes, the Franchise Tax Board would need to implement the tax within six months, facing challenges in valuing assets and determining residency. Newsom has not yet taken a position on Prop 41, another Brin-backed measure that would also nullify Prop 40.