Wealth tax criticized by billionaires and Gavin Newsom would levy a one-time 5% tax on residents worth over $1bn

A popular proposal in California to impose a wealth tax on billionaires has gained enough signatures to qualify for the ballot in November, state officials announced on Wednesday.

The news is set to intensify an already heated debate around the tax, which has pitted tech moguls and the state’s governor, Gavin Newsom, against the labor union backing the measure.

The California Billionaire Tax Act, colloquially known as the billionaire tax, would levy a one-time 5% tax on any California resident worth more than $1bn. The proposal is backed by the Service Employees International Union-United Healthcare Workers West (SEIU-UHW) as a means of funding California’s strained healthcare, food assistance and education programs.