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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Sergey Brin’s potential $13 billion tax bill is an estimate from secondary coverage, not an official assessment. California’s Proposition 40 would impose a one-time tax of up to 5% on certain covered assets held by billionaires and trusts, but the official voter guide does not calculate Brin’s individual liability. Separately, Fortune reported in August 2026 that Brin had given $102 million to a committee opposing the proposal; that figure was not independently confirmed against a primary campaign-finance filing in the material reviewed.
What California Proposition 40 would do
Proposition 40 qualified for California’s November 3, 2026 general-election ballot, according to the California Secretary of State’s voter guide and the state’s announcement of qualified measures. The guide describes a proposed one-time tax of up to 5% on covered assets valued over $1 billion, applying to qualifying billionaires and trusts under the measure’s definitions.
The voter-guide analysis says the measure covers billionaires who were California residents on January 1, 2026. Covered assets include businesses, securities, art, collectibles and intellectual property. The official summary identifies exclusions, including real property and some pensions and retirement accounts. The initiative text, published by the California Attorney General, provides the legal language and asset definitions; whether a particular holding is included depends on those provisions.
Why the $13 billion figure is not a confirmed bill
The Secretary of State’s materials describe the tax rate, covered assets and residency rule, but do not state Sergey Brin’s personal tax liability. The $13 billion figure is an estimate reported in secondary coverage, not a final bill or official individual assessment. A person-specific calculation would depend on which assets qualify, how those assets are valued under the proposal, and the measure’s definitions and exemptions.
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What has been reported about Brin’s political spending
The reported donation totals refer to different dates and sources, so they should not be treated as a single independently verified current total.
| Reported total | Source and date | Qualification |
|---|---|---|
| $82 million | Associated Press, June 26, 2026 | AP reported Brin had donated this amount to Building a Better California, a committee backing initiatives intended to blunt the tax proposal. It is a total reported as of that date. |
| $102 million | Fortune, August 11, 2026 | Fortune’s report, reflected in a search-result excerpt, gave this later total. It was not independently confirmed against a primary campaign-finance filing in the material reviewed. |
Both figures describe reported political contributions, not the amount Proposition 40 would charge Brin. The spending report and the tax estimate answer different questions.
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What the state estimates about revenue
The California Secretary of State’s 2026 voter-guide summary estimates wealth-tax revenues would probably total tens of billions of dollars spread over several years. It also projects a possible ongoing decrease of less than $1 billion per year in state income-tax revenue collected from billionaires. These are projections, not guaranteed outcomes: one is an estimated multi-year revenue stream, while the other is a possible recurring reduction.
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