The latest California effort to target the state’s wealthiest taxpayers has become a rallying cry for an economic and demographic transformation underway in the United States as a whole. At the heart of the issue is the so called 2026 Billionaire Tax Act, which proposes a single, 5% assessment on the net worth of taxpayers with over $1 billion in assets, with the aim of directing billions into the healthcare and education systems, but which could accelerate the migration of high-net-worth taxpayers and their assets to lower-tax states.
The scope of the proposed law is unusually broad, said a financial analyst. It would apply retroactively to all individuals who meet the wealth test and resided within the state of California on January 1, 2026, regardless of their continued presence within the state when the tax is due. The manner by which the law calculates the wealth is also complicated, resulting, at times, in the exaggeration of the amount subject to taxation. Founders of such companies owning super-voting stock may have their liability determined on the basis of voting power instead of economic interests, there by being compelled to divest their control over the company to meet the tax liability.
Also problematic for private companies is the system of valuation that comes with the plan. The formula for private companies assumes high multiples of book profit, does not apply a liquidity discount, and uses floors that are based on previous rounds of funding. This means that companies that are struggling could end up being taxed as if they are performing well. Additionally, high penalties for error apply not only to the taxpayer but to the valuer as well if the latter’s estimate is lower than the state’s estimate.
Legal analysts believe that there is plenty of room for litigation. There are a number of potential claims that could be made that range from a violation of the Dormant Commerce Clause of the United States Constitution to a claim that it is a form of retroactive taxation without due process to a claim that it is a form of unconstitutional bill of attainder because it targets a small identifiable group of people, said a lawyer. The retroactive residence provision of this initiative is going to be challenged because it could apply to people who have moved out of state months before a vote is taken on this initiative, added another.
Governor Gavin Newsom, while defending California’s progressive taxation system, has expressed his opposition to the measure, fearing it may have unintended consequences. This is in line with the views of business leaders and economists, who have cited the movement of people away from California to illustrate how the state is losing its high-income population. California lost several billion dollars of adjusted gross income between 2021 and 2024, with the IRS reporting this income moving to states such as Texas and Florida, where there is no personal income tax. Both Texas and Florida have been actively wooing businesses and individuals to relocate there because of their low taxes and reduced regulations.
It is a part of a broader national movement. The Sun Belt states, especially in the Southeast, have been experiencing strong population and job growth, thanks in large part to housing and business-friendly policies. The high-cost, high-tax states on the East and West Coasts, on the other hand, have been losing population steadily. The California state budget depends heavily on personal income taxes, of which half a percent comes from the top 1% of earners. Losing such a small percentage of the base would be a significant concern.
Supporters of a wealth tax say that being so reliant on a small group of ultra-rich taxpayers is a problem in and of itself. They say it is only fair and necessary that a share of the huge wealth created with the benefit of California’s infrastructure and markets be taxed. Critics say that a wealth tax with such flaws and penalties could very well destroy the very same economic systems that created those huge fortunes.
However, whether the proposed amendment makes it to the ballot in November 2026 is yet to be seen. Signature gathering is currently ongoing, and the political lines are already being drawn. However, the implications of the proposed amendment have transcended the boundaries of California and are being used as a case study on the impact of tax policies at the state level on the movement of people and resources across the country.
