California's billionaire tax must outpoll two rival amendments to survive

Five percent of $2.3 trillion is $115 billion ^[19]. The measure's stated aim is smaller: "tens of billions" to close budget holes in Medicaid, food assistance, education and other programs ^[3]. The California Budget & Policy Center says the measure is largely a response to federal funding lost under the 2025 budget law ^[4]. Critics expect billionaires to leave the state and the tax to draw legal challenges ^[8], and either would pull collections below the gross figure. Six Nobel Prize-winning economists, writing in support, put the billionaires' combined wealth at the entire income of California's 20 million taxpayers ^[2]. On that comparison, the gross levy equals 5% of one year of all taxpayer income in the state ^[20].

The ballot design is the more interesting term. Propositions 41 and 42 are constitutional amendments, and the Legislative Analyst's Office says either can undo part or all of Prop 40 if it receives more yes votes ^[5]. That gives opponents two routes, keeping Prop 40 from passing or outpolling it with a rival, and their money is going to both ^[6]. Colorado's ballot has the same shape. A measure there would replace the flat tax with higher rates on top households and cuts for nearly everyone else, and a competing measure undoes it if it draws more yes votes ^[10].

Three outcomes are live: Prop 40 fails, it passes and a rival outpolls it, or it passes, beats both rivals and goes to court ^[8]. I'd expect one of the first two, because the opposition can win on either and approval of taxing the wealthiest polls under half ^[7]. The counter-case is a coalition with its own budget stake. Some labor organizations and Rep. Ro Khanna back the measure ^[11], and the programs it would fund are the ones exposed to the federal cuts ^[4].

The view is wrong if Prop 40 outpolls both rivals and survives its first court test. Residency planning would then depend on the date and the test that fix liability, and the Stateline report does not include them. The state's side of that trade is recurring income. The higher rates on California's three top brackets, which Proposition 3 would extend, bring in $10 billion a year, according to the Institute on Taxation and Economic Policy ^[13]. The gross levy equals about 11.5 years of that stream ^[22], and the critics' warning is that departures would cut into the stream itself ^[8].

Florida, one of at least nine states with tax measures on the ballot ^[1], is weighing mostly conservative-backed cuts to property or income taxes ^[15]. "Florida is reflecting the broader conversation about property taxes right now," said Janelle Fritts, senior policy analyst at the Tax Foundation ^[16]. "Any kind of tax elimination is going to require a lot of tradeoffs," she said ^[14].