Sergey Brin has now donated more than $100 million to the campaign against California's proposed billionaire wealth tax. According to a newly filed California campaign finance report (first shared by Bloomberg), the Google co-founder has recently contributed an additional $20 million to political committee Building a Better California.

California's Prop 40 would impose a one-time 5% tax on the net worth of the state's billionaires.

Google co-founder Sergey Brin has donated over $100 million to oppose California's proposed billionaire tax, which could cost him an estimated $13.3 billion in payments.