California billionaires tax heads to ballot in Democratic showdown

California's billionaire tax is barreling toward the November ballot, a one-time 5% levy aimed at residents with net worth above $1 billion. Supporters filed the measure on November 26, 2025, submitted signatures on April 27, 2026, and now face a June 25 deadline for the secretary of state to decide whether the campaign cleared the 874,641 valid signatures needed to qualify.

If it survives review, the initiative would put California at the center of a national fight over whether states can directly tax extreme wealth to patch budget gaps. The proposal would apply retroactively to people residing in California as of January 1, 2026, and supporters say it could generate about $100 billion over five years. About 90% of the revenue would go to health care, with the rest split between public education and food assistance through a new 2026 Billionaire Tax Reserve Fund.

The mechanics are designed to blunt the immediate hit to taxpayers while still collecting a massive sum. Billionaires could pay in five annual installments starting in 2027, and unpaid balances would carry a 7.5% annual deferral charge. The measure would exclude real estate and pensions from the net-worth calculation, while taxing other holdings such as publicly traded securities, private business interests, art, collectibles, intellectual property and some trusts.

The politics have turned into a fierce Democratic civil war. Newsom opposes the tax, and in a May 5 gubernatorial debate all California candidates except Tom Steyer lined up against it. Steyer later said the tax "doesn't go far enough" but also said he wants California to remain a place where major companies can start and grow. SEIU-UHW West, which represents more than 120,000 health care workers, has led the signature drive, but a growing bloc of unions and health care groups has broken away to oppose the measure, including labor organizations representing construction workers, carpenters, police officers and teachers, along with Planned Parenthood.

Money has only intensified the fight. Save California Health Care and Public Education had reported more than $3.5 million in contributions as of February 2026, while the broader support network has drawn more than $31 million. On the other side, Building a Better California has raised more than $118 million from 10 donors, with more than half coming from Google co-founder Sergey Brin, and two competing ballot initiatives backed by that group have each attracted roughly $48 million and $49 million. Those measures are meant to erase the billionaire tax if either one wins more votes, turning California into a test case for whether Democrats can make wealth taxation into policy, or whether it ends up as an expensive symbolic battle.