Read the actual sources.
A curated and verified list of every source this site references. Each row links to a primary or near-primary publication. Every row carries a perspective tag (proponent / opposition / neutral) so you can read across the spectrum without us pre-digesting it.
This site is published by NLT143 for educational purposes and to bring awareness to a live policy fight that California voters will decide on November 3, 2026. Numbers and quotes are sourced from the public record and identified per row. Where the source is paywalled or in motion, the row is marked. Nothing on this site is tax, legal, or investment advice. Read the actual papers before forming a view.
- Initiative 25-0024 Amdt. 1, full ballot textCalifornia Office of the Attorney GeneralNeutralFiled by Suzanne Jimenez, Nov 24 2025
The 2026 Billionaire Tax Act imposes a one-time 5% excise tax on net worth ≥$1B for California residents on Jan 1 2026, valued Dec 31 2026.
- Fiscal impact estimate · Initiative 25-0024California Legislative Analyst's OfficeNeutralLAO · 2026
Independent fiscal estimate produced for the AG-issued title and summary.
- Ongoing State Tax Revenue Implications of the 2026 California Billionaire Tax ActCalifornia Tax Foundation · SSRNConJared Walczak · April 21 2026
Estimates $3.53B–$4.49B per year in ongoing state revenue loss from billionaire departures, in net-present-value terms outweighing the one-time tax.
- The Net Present Value of the Billionaire Tax ActHoover InstitutionConRauh, Jaros, Kearney, Doran, Cosso · March 4 2026
Uses 51.6% migration response derived from Brülhart et al; central paper Walczak builds on.
- Response to The Net Present Value of the Billionaire Tax ActSSRNProGalle, Gamage, Saez, Shanske · March 19 2026
Argues the response should be modeled at ~10% all-channel avoidance, treating the levy as one-time per its plain text.
- Money Moves: Taxing the Wealthy at the State Level (113 Cal. L. Rev. 635)California Law ReviewProGalle, Gamage, Shanske · 2025
Constitutional and administrative case for state-level wealth taxation. Cited in the Act's findings (v).
- How Much Tax Do US Billionaires Pay? Evidence from Administrative DataNBER Working Paper 34170NeutralAkcan Balkir, Saez, Yagan, Zucman · August 2025
Source of the 24% all-tax rate for billionaires vs 30% average taxpayer. Cited in Act findings (s) and in the Walczak paper.
- California Initiative 25-0024 (2026)BallotpediaNeutralBallotpedia editors · ongoing
Neutral aggregate of the campaign, donors, polling, and endorsements as updated.
- California billionaire tax secures enough signatures to make ballotCBS NewsNeutralCBS News · April 27 2026
Reporting on the 177% signature filing.
- Tech and agriculture billionaires line up against California wealth taxThe New York TimesNeutralNYT · January 28 2026
Reporting on Schmidt, Resnick, and other early opposition donors.
- Sergey Brin pours $58M into California opposition committeeFortuneNeutralFortune · April 26 2026
Reporting on the largest single CA ballot-measure check on file.
- Silicon Valley names join the anti-CABTA coalitionThe San Francisco StandardNeutralSF Standard · March 9 2026
Reporting on Collison, Doerr, Moritz contributions to Building a Better California.
- Coverage hub for Initiative 25-0024CalMattersNeutralCalMatters · ongoing
Nonprofit California-focused journalism. Tracks the campaign without taking a position.
- Public statements supporting the 2026 Billionaire Tax ActPatriotic MillionairesProPatriotic Millionaires · ongoing
National advocacy group of high-net-worth individuals supporting wealth-tax policy at the state and federal level.
- Position on the 2026 Billionaire Tax ActCalifornia Taxpayers Association (CalTax)ConCalTax · ongoing
California's longest-running anti-tax advocacy group; established the California Tax Foundation that publishes Walczak.
- Position on the 2026 Billionaire Tax ActHoward Jarvis Taxpayers AssociationConHJTA · ongoing
Prop 13 defenders. Routinely opposes state-level wealth or property-style taxation.
- Position on the 2026 Billionaire Tax ActCalifornia Business RoundtableConCABRT · ongoing
CEO coalition operating Californians Against Higher Taxes. Has filed five companion ballot measures.
- Public support for the 2026 Billionaire Tax ActSEIU-UHWProSEIU United Healthcare Workers West · ongoing
Anchor proponent. Largest in-kind contributor to the proponent committee.
- Analysis supporting progressive revenue measuresCalifornia Budget & Policy CenterProCBPC · ongoing
Independent fiscal-policy nonprofit publishing analysis aligned with the Act's revenue purpose.
- Two markets on qualification and passagePolymarketNeutralPolymarket · ongoing
Real-money prediction market signal. Refreshed every 15 minutes on the terminal.
- Chamath Palihapitiya thread on the 2026 Billionaire Tax ActX (formerly Twitter)Con@chamath · April 2026
Public-figure case against the Act from a working investor's POV.
- Lulu Meservey on framing, "It's not a Billionaire Tax"X (formerly Twitter)Con@lulumeservey · April 2026
Communications-strategy critique of the bill's label.
Why this is not a vote count.
Initiative 25-0024 is a citizen ballot initiative under Article II §8 of the California Constitution. The legislature does not vote on whether it becomes law. Voters do, on November 3, 2026. Individual Assembly members and Senators may endorse, oppose, fundraise, or stay silent, and those positions are voluntary public statements, not formal floor votes.
- Ballotpedia maintains the canonical endorsement list as members go on record.
- CA State Assembly · official member directory for confirming who represents which district.
- CA Federation of Labor Unions, AFL-CIO for proponent-aligned legislator endorsements as they roll in.
- California Business Roundtable for opposition-aligned legislator endorsements.
Doing so accurately requires a daily scrape of Ballotpedia plus cross-checks against member press offices, and we have not yet wired that pipeline. Listing names from memory or hearsay would be worse than listing none. The links above are the verified primary sources; build your own list from there or check back once the pipeline ships.
Don't trust us. Open the links.
Every entry above carries a direct URL to its primary publication. If a row drifts from the underlying source, the source wins. Read our methodology or open a correction at @davidtphung.