2025年10月，加利福尼亞州提出一項備受關注的稅收提案，計劃對全州約200名億萬富翁徵收一次性5%的財富稅。這一措施旨在應對聯邦政府削減醫療保健和教育資金所帶來的壓力，預計可為州內籌集約1000億美元，其中90%將用於低收入群體的醫療保健，10%用於K-12教育。該提案也是對2025年初由唐納德·川普簽署的《大美麗法案》（One Big Beautiful Bill Act）的回應，該法案在未來十年將削減超過1兆美元的醫療保健和食品援助預算，可能使加州每年損失高達300億美元的醫療補助金，影響約340萬名參與者。

提案的支持者包括SEIU-United Healthcare Workers West和洛杉磯的聖約翰社區醫療機構。他們已向加州總檢察長Rob Bonta提交請求，尋求批准開始收集87萬多個簽名，將此提案列入2026年11月的選票。然而，提案能否通過仍不確定，特別是考慮到州長Gavin Newsom過去對針對富人的增稅持反對態度。

根據提案內容，加州2025年12月31日居住的億萬富翁將被徵收一次性5%的財富稅，並有五年的時間完成繳納。僅全球前十富翁中居住在加州的四人——Facebook創辦人Mark Zuckerberg、NVIDIA首席執行官黃仁勳、以及Google創始人Larry Page和Sergey Brin——按目前估值計算，可能就需繳納超過400億美元的稅款。

支持者認為，這項措施對保障數百萬人不失醫療保險覆蓋至關重要，同時能促進更公平的州稅收體系。他們警告，如果不採取此舉，將可能導致大量民眾失去醫療保險，無法接受治療。然而，最終是否能實施，仍需由選民在2026年投票決定。

In October 2025, California introduced a high-profile proposal to levy a one-time 5% wealth tax on approximately 200 billionaires residing in the state. The measure aims to address the financial pressure caused by federal cuts to healthcare and education funding and is expected to raise around $100 billion, with 90% allocated to healthcare for low-income residents and 10% to K-12 education. The proposal also serves as a response to the “One Big Beautiful Bill Act” signed by former President Donald Trump earlier in 2025, which is projected to cut over $1 trillion from healthcare and food assistance programs over the next decade, potentially resulting in an annual loss of up to $30 billion in Medicaid funding in California, affecting around 3.4 million participants.

Supporters of the proposal include SEIU-United Healthcare Workers West and the St. John Community Health Center in Los Angeles. They have submitted a request to California Attorney General Rob Bonta seeking approval to begin collecting over 870,000 signatures to place the measure on the November 2026 ballot. However, the outcome remains uncertain, particularly given Governor Gavin Newsom’s past opposition to tax increases targeting the wealthy.

Under the proposal, billionaires residing in California as of December 31, 2025, would be required to pay the one-time 5% wealth tax, with a five-year period to fulfill the payment. Among them, four of the world’s top ten billionaires currently living in California—Mark Zuckerberg (Facebook), Jensen Huang (NVIDIA), and Google founders Larry Page and Sergey Brin—alone could be liable for over $40 billion in taxes based on current valuations.

Proponents argue that the tax is crucial to ensure millions of residents maintain health insurance coverage and to promote a fairer state tax system. They warn that without such a measure, countless individuals could lose access to healthcare, creating serious social consequences. The ultimate fate of the proposal, however, will depend on voter approval in the 2026 election.