Billionaire Tax Explained: What You Need to Know About Prop. 40

October 14, 2026

Billionaire Tax Explained: What You Need to Know About Prop. 40

Photo via istockphoto.com

Proposition 40, also known as the billionaire tax, is the most contentious fight on Californians’ ballots this November.

The proposal to impose a one-time asset tax on the net worth of the state’s approximately 200 billionaires has divided Democrats, galvanized progressives and sparked fierce pushback from business groups and the state’s wealthy tech sector. Google co-founder Sergey Brin has poured more than $138 million into the campaign against the measure — including two countermeasures, Propositions 41 and 42 — and is among a handful of billionaires who have moved residences or business assets out of the state in an attempt to avoid the proposed tax. In total, opponents have raised more than $205 million to stop Prop. 40, according to campaign finance records.

It would also set up an entirely new system of taxes in a state that doesn’t traditionally tax wealth. That would be challenging to implement and experts say is sure to invite litigation. Here are some common questions and answers about how the measure would work.

How would the state assess the tax?

Aside from local taxes on real estate and some business equipment, California isn’t in the business of valuing and taxing…

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