This California Prop Prevailed in Billionaire Tax Battle. But What Will It Do?
A sign in favor of taxing billionaires outside the San Francisco Public Library last year.

TL;DR
- Proposition 42 passed with 51.3% of the vote, invalidating a proposed billionaire tax.
- The measure prevents lawmakers from imposing a state wealth tax on assets without voter approval, excluding certain assets like real estate.
- Prop 42 also prohibits lawmakers from passing retroactive taxes, except in cases of declared emergencies.
- It does not prevent citizens from proposing new wealth or retroactive tax ballot measures in the future.
- Supporters claim it protects retirement savings, while opponents argue its primary goal was to block the billionaire tax and potentially deter future wealth tax initiatives.
- The measure's impact on future tax revenue and specific fees like vehicle license fees is subject to differing interpretations.
- The passage of Prop 42 and the defeat of the billionaire tax may discourage future attempts to implement wealth taxes in California.