**Google co-founder Sergey Brin has spent $102 million this year to back a political group fighting a proposed California wealth tax.**

Brin, whose net worth places him among the world's richest individuals, recently added a $20 million contribution to Building a Better California. The organization is funding Propositions 41 and 42, which are on the ballot alongside Proposition 40.

Proposition 40 proposes a one-time 5% tax on the assets of individuals with a net worth of at least $1 billion who lived in the state at the start of the year. Supporters, including healthcare unions and lawmakers, estimate the tax would raise tens of billions of dollars for healthcare, education, and food assistance.

Conversely, Propositions 41 and 42 would establish new audit requirements for special taxes and prohibit taxes on retirement holdings, personal savings, and past earnings. According to state analysts, if either of these measures receives more votes than Proposition 40, it would nullify the wealth tax entirely.

Building a Better California states that its goal is to protect affordability, innovation, and economic growth. However, proponents of the wealth tax argue the measures are designed to mislead voters and protect ultra-wealthy residents from paying the levy.

The proposal has drawn heavy division. Labor unions and Democratic groups strongly support the tax, while business organizations, state leadership, and other prominent tech executives oppose it, warning that wealth taxes will drive billionaires and their investments out of the state. Brin and several other major donors to the opposition campaign have already reduced their residency ties to California.

The Bizarre Billionaire Fight Over California's Wealth Tax