California’s Franchise Tax Board Prepares for Unprecedented Billionaire Residency Audits

Key points

• Proposition 40, a one-time 5% tax on billionaires, aims to raise approximately $100 billion to offset federal healthcare funding cuts.
• The Franchise Tax Board (FTB) must determine residency and value global assets within six months of the measure’s passage, a task it has never performed before.
• Billionaires such as Sergey Brin, Larry Page, and Peter Thiel have relocated or cut ties with California to avoid the tax, citing hostile tax environments.
• Residency is determined by the 'Bragg factors,' which assess the 'center of life,' including business interests, family location, and asset storage, not just driver’s licenses or voter registration.
• Labor unions oppose Prop 40, arguing it contains loopholes that could tax the retirement savings and home equity of working-class Californians.
• Two countermeasures, Propositions 41 and 42, funded by billionaire interests, could nullify Prop 40 if they receive more votes in the November election.

Background

California voters are deciding on Proposition 40, a one-time 5% wealth tax on individuals with a net worth exceeding $1 billion, on November 3, 2026. The measure was crafted by healthcare unions to offset $100 billion in federal healthcare funding cuts approved by the previous administration. Prior polls indicated a narrow support for Prop 40, but recent data shows a decline in support, with 45% of likely voters backing it versus 42% opposing it. The debate has been intensified by billionaire-funded countermeasures, Propositions 41 and 42, which aim to block or nullify the wealth tax. The Franchise Tax Board, known for its aggressive pursuit of tax debts, is now preparing to administer a new type of tax that requires valuing complex global assets and determining residency in a way it has never done before.

How outlets are covering it

Politico emphasizes the operational challenges facing the Franchise Tax Board, highlighting the unprecedented nature of valuing global assets and determining residency for billionaires who are actively fleeing the state. The outlet notes the agency’s reputation for dogged pursuit but questions its ability to handle a new type of tax within a short timeframe. The Los Angeles Times focuses on the political and economic implications, highlighting the opposition from labor unions who argue the tax could harm working-class families through loopholes. The FT, while paywalled, suggests the measure could have broader implications for America’s tax structure. The sources agree on the high stakes and the active relocation of billionaires but differ in their emphasis: Politico on the administrative burden, the LA Times on the political and economic fallout, and the FT on the structural impact.

Why it matters

The outcome of Proposition 40 will determine whether California can raise $100 billion to offset federal healthcare cuts or if the state will lose significant tax revenue due to billionaire relocations. The measure’s implementation will test the limits of the Franchise Tax Board’s capabilities and could set a precedent for wealth taxation in other states. The debate also highlights the tension between progressive taxation and the potential for capital flight, with implications for the state’s budget and the broader economy.

What to watch

Voters will decide on Proposition 40, 41, and 42 on November 3, 2026. If Prop 40 passes, the Franchise Tax Board will have six months to administer the tax, including determining residency and valuing assets. Legal challenges are expected, potentially delaying implementation. The outcome will also influence the state’s budget and the future of wealth taxation in other states.