California’s proposal to impose a one-time tax on billionaires has triggered a major debate within the Democratic Party, exposing differences among its leaders, lawmakers and labour unions over how to address wealth inequality and protect public welfare programmes. While supporters argue that taxing the ultra-rich could generate much-needed funds for healthcare, opponents have raised concerns about the possible economic consequences, the departure of wealthy residents and the long-term impact on the state’s finances.
The proposal, which has emerged as a significant political issue ahead of California’s November 2026 elections, seeks to impose a one-time tax of 5% on the net worth of residents whose wealth exceeds $1 billion. Known as Proposition 40, the measure is expected to affect more than 200 billionaires in the state. A substantial portion of the money collected would be directed towards healthcare services, particularly to compensate for anticipated reductions in federal healthcare funding.
The initiative has received backing from the Service Employees International Union-United Healthcare Workers West (SEIU-UHW), which argues that additional resources are necessary to protect healthcare services and workers from the consequences of federal funding cuts. Its supporters contend that the wealthiest individuals should contribute more towards maintaining essential public services, particularly at a time when hospitals and low-income communities face financial pressures.
However, the proposal has not received unanimous support even within Democratic ranks. California Governor Gavin Newsom has opposed the measure, warning that its implementation could create economic uncertainty and encourage wealthy individuals to relocate to other states. Several labour organisations and Democratic lawmakers have also expressed reservations, highlighting concerns about the proposal’s design and its potential implications for the state’s economy.
The disagreement has also drawn prominent national political figures into the controversy. Senator Bernie Sanders and California Congressman Ro Khanna have emerged as vocal supporters of the tax. At a campaign rally in Los Angeles in October, Sanders urged voters to back the proposal, describing it as an important test of whether the country could make its wealthiest citizens contribute more towards public services. Khanna, meanwhile, criticised Newsom’s opposition, accusing the governor of siding with wealthy donors rather than supporting policies aimed at reducing economic inequality.
Newsom has maintained that imposing a wealth tax at the state level is not an appropriate approach. He has argued that such a measure could undermine California’s ability to retain wealthy entrepreneurs and investors. He has also favoured addressing the issue through changes to the federal taxation system rather than introducing a separate state-level levy.
The controversy has extended beyond elected representatives, creating divisions among labour unions that have traditionally supported Democratic policies. SEIU-UHW president Dave Regan spearheaded the initiative as a response to healthcare funding reductions under US President Donald Trump’s One Big Beautiful Bill Act. However, several other unions have opposed the proposal, questioning its approach and the consequences it could have for the state’s economy. The disagreement has also turned personal, with Regan facing allegations of pressuring and harassing other labour leaders to secure support for the initiative. Regan has rejected the accusations, describing them as an attempt to discredit the campaign.
The proposal requires a simple majority of votes to become law. However, recent polling has indicated a decline in public support as the November 3 election approaches. According to a survey by the Public Policy Institute of California, support for the billionaire tax fell to 46%, compared with 52% in September. The decline suggests that concerns surrounding the measure, along with confusion over competing ballot initiatives, could influence voters’ decisions.
Opposition to the proposal has also received substantial financial backing from wealthy technology industry figures. Google co-founder Sergey Brin has contributed $102 million towards two competing ballot initiatives intended to overturn Proposition 40 and prevent similar wealth taxes from being introduced in the future. These counter-proposals have added another layer to an already complicated election debate, with voters being asked to consider multiple measures relating to taxation and the state’s financial policies.
The outcome is being closely watched beyond California because of its potential implications for the national debate on wealth taxation. The state has historically played an influential role in shaping political and economic policy across the United States. The passage of Proposition 13 nearly five decades ago, which placed restrictions on property taxes, triggered a wider debate on taxation and influenced similar movements elsewhere in the country.
The current controversy could similarly shape discussions on taxing the ultra-rich. Sanders and Khanna have already introduced legislation in Congress proposing an annual 5% wealth tax on America’s billionaires. Meanwhile, Xavier Becerra, a Democrat considered a potential successor to Newsom as California governor, has indicated that he is examining the possibility of introducing a new income tax targeting wealthy individuals.
As California prepares to vote, the billionaire tax has become more than a state-level financial proposal. It has exposed differences within the Democratic Party over economic policy, healthcare funding and the role of wealthy individuals in the country’s political system, with its outcome likely to influence future discussions on wealth taxation across the US.
