California Wealth Tax Measure Sparks Debate Over State Property Tax Cap

California voters are considering Proposition 40, a measure proposing a one-time 5% tax on residents with net worths exceeding $1 billion, as state leaders seek new revenue sources. Proponents estimate the wealth tax could generate $100 billion to help offset federal reductions in healthcare spending.

The proposal has reopened debate over California’s tax architecture, which relies heavily on income taxes following the passage of Proposition 13 in 1978. That law capped property taxes at 1% of assessed value and limited annual increases to 2%, prompting the state to establish a top marginal income tax rate of 13.3%.

Opponents of Proposition 40 warn the asset tax could stifle economic growth, hurt startups, and force company founders to sell equity. Critics also argue the measure could drive high earners out of state, resulting in a net loss of revenue over time. Conversely, supporters argue the state's ultra-wealthy can afford the levy given gains from the technology sector.

Economic analyses suggest that modifying property tax rules could generate significant long-term revenue. California homeowners currently pay an average property tax rate of 0.8%, compared to 2% in states like Texas. Aligning rates with higher-tax states could more than double residential property tax receipts while potentially easing home prices by 13%.

With California planning to spend $540 billion in the current fiscal year, experts note that expanding revenue collection beyond a few hundred billionaires to a broader base of high-value property owners would provide more durable funding, despite potential opposition from homeowners facing higher tax bills.