TL;DR
State and federal wealth tax designs are shifting from speculative proposals to highly detailed, empirically modeled legislative and ballot battles. While new transaction-level research on California's ultra-wealthy challenges long-standing capital flight arguments, Washington State faces a high-stakes ballot fight that threatens broader social program funding, and federal lawmakers are leveraging post-Moore legal terrain to propose aggressive valuation reforms.
Subnational Revenue Realities and the "Missing Billionaire" Math
Granular transaction data is rewriting the debate over state-level wealth taxes by showing that billionaires pay far less under traditional income taxes than previously estimated, while revealing a large, unmapped tier of "small billionaires" that boosts potential revenues.
"...Alphabet founders Larry Page and Sergey Brin paid $0 in California individual income tax on their Alphabet wealth in 2019, 2020, and 2023. Alphabet paid no dividends, they reported no stock sales, and they accepted symbolic $1 salaries..."
— California 2026 Initiative
(Source: NBER Working Paper No. 35218)
This empirical reality directly undermines opponents' arguments that a wealth tax would cause a net-negative revenue loss from capital flight. By showing that the wealthiest residents pay an effective income tax rate of just 0.07% of their wealth, researchers Jasper Boll, Emmanuel Saez, and Gabriel Zucman demonstrate that even aggressive departures would take a century of income tax losses to offset a one-time 5% wealth levy, especially when accounting for an estimated 617 actual billionaires in the state California 2026 Initiative.
What to watch: Watch whether other states adopt the "Pareto tail extrapolation" methodology to identify hidden fortunes when designing their own progressive tax brackets California 2026 Initiative.
State-Level Backlash and the Collateral Fiscal Risks of Tax Repeals
The conservative pushback against progressive state taxes is hitting a wall of public resistance and legal warnings that anti-tax initiatives could dismantle broader social safety net funding.
"...the initiative's broad drafting could have devastating, unintended consequences for the state's entire fiscal structure... [and] could also strike down payroll taxes that fund Washington's critical social safety net..."
— Washington Constitutional Constraints
(Source: Northwest Progressive Institute)
The aggressive push by opponents to repeal Washington's 9.9% millionaires' tax has backfired by exposing popular programs like Paid Family and Medical Leave to legal jeopardy Washington Constitutional Constraints. Early polling suggests that voters, having already rejected a capital gains tax repeal in 2024, are highly skeptical of these sweeping measures Washington Constitutional Constraints.
What to watch: Watch whether Washington voters reject Initiative Measure No. 26-645 this November, establishing a powerful precedent that progressive taxes on high earners can survive direct popular votes Washington Constitutional Constraints.
Federal Design Overhauling Valuation and Enforcement
Federal wealth tax proposals are shifting their focus from constitutional defense to the practical mechanics of asset valuation and massive IRS enforcement funding.
"...the bill explicitly authorizes the IRS to use 'formulaic valuation approaches for designated assets, including formulaic approaches based on proxies for determining presumptive valuations.'"
— Federal Wealth Tax Proposals
(Source: S. 4246 Legislative Text)
By providing a $100 billion funding boost and mandating formulaic valuation rules, Senator Elizabeth Warren's S. 4246 attempts to preemptively solve the historic administrative nightmare of valuing illiquid assets Federal Wealth Tax Proposals. This shows that federal proponents are no longer just debating the legality of taxing net wealth post-Moore, but are actively building the administrative machinery to enforce it Federal Wealth Tax Proposals.
What to watch: Watch whether the Treasury Department begins drafting preliminary guidance on formulaic proxies for illiquid private assets in anticipation of future legislative shifts Federal Wealth Tax Proposals.
What surprised us
- The "Small Billionaires" Gap: Standard journalistic lists like Forbes are highly accurate for ultra-visible multi-billionaires but miss a massive "small billionaire" tier California 2026 Initiative. Applying a Pareto tail extrapolation reveals there are actually an estimated 617 billionaires in California—368 more than listed by Forbes—representing a massive, untapped tax base California 2026 Initiative.
- The $0 Tax Years of Tech Giants: Despite generating billions in economic profits, prominent tech founders like Larry Page and Sergey Brin managed to pay exactly $0 in California individual income tax in multiple recent years California 2026 Initiative. This starkly illustrates how easily the ultra-wealthy can bypass traditional income taxation by avoiding stock sales and dividend distributions California 2026 Initiative.
- The Self-Defeating Nature of Repeal Initiatives: The broad drafting of anti-income tax initiatives can accidentally trigger catastrophic legal challenges to existing payroll taxes and social programs Washington Constitutional Constraints. Rather than just rolling back a millionaires' tax, Washington's repeal measure threatens to dismantle unemployment insurance and long-term care funding Washington Constitutional Constraints.
Since last time
- Promoted — Federal Wealth Tax Proposals: This is a new area of focus, moving from state-level debates to federal legislative mechanics.
- Escalated — California "Missing Billionaire" Data: The focus has shifted from the general concept of a ballot battle to specific, granular NBER research on revenue math.
- Escalated — Washington State Repeal Initiative: The framing has evolved from a constitutional debate to a discussion of "collateral fiscal risks" and the unintended consequences of the repeal.
- Demoted — Constitutional Uniformity Arguments: Previously a standalone section, this is now treated as background context for the Washington state repeal fight.
- Disappeared — The Empirical Ledger of Revenue and Capital Flight (Norway/Europe): The previous analysis of European capital flight and exit taxes is entirely absent from this briefing.
Subnational Revenue Realities (Escalated)
The debate in California has moved beyond the general "ballot box battle" to a focus on granular, transaction-level data. New research is challenging the traditional capital flight narrative by highlighting the "missing billionaire" math—showing that the ultra-wealthy pay significantly less in income tax than previously understood.
"...Alphabet founders Larry Page and Sergey Brin paid $0 in California individual income tax on their Alphabet wealth in 2019, 2020, and 2023. Alphabet paid no dividends, they reported no stock sales, and they accepted symbolic $1 salaries..."
— California 2026 Initiative (Source: NBER Working Paper No. 35218)
This data suggests that even if aggressive wealth taxes trigger some capital flight, the revenue lost over a century would be offset by the current effective income tax rates of the state's 617 billionaires. What to watch: Watch whether other states adopt the "Pareto tail extrapolation" methodology to identify hidden fortunes when designing their own progressive tax brackets California 2026 Initiative.
State-Level Backlash and Collateral Fiscal Risks (Escalated)
The Washington State debate has shifted from a focus on constitutional uniformity to the "collateral fiscal risks" of the anti-tax repeal movement. The argument is no longer just about the legality of the tax, but the potential for the repeal initiative to inadvertently dismantle broader social programs.
"...the initiative's broad drafting could have devastating, unintended consequences for the state's entire fiscal structure... [and] could also strike down payroll taxes that fund Washington's critical social safety net..."
— Washington Constitutional Constraints (Source: Northwest Progressive Institute)
What to watch: Watch whether Washington voters reject Initiative Measure No. 26-645 this November, establishing a powerful precedent that progressive taxes on high earners can survive direct popular votes Washington Constitutional Constraints.
Federal Design and Enforcement (Promoted)
Federal proposals are now moving past the constitutional debates surrounding Moore to focus on the practical, administrative machinery of wealth taxation. Senator Elizabeth Warren's S. 4246 is the primary vehicle here, specifically targeting the "administrative nightmare" of valuation.
"...the bill explicitly authorizes the IRS to use 'formulaic valuation approaches for designated assets, including formulaic approaches based on proxies for determining presumptive valuations.'"
— Federal Wealth Tax Proposals (Source: S. 4246 Legislative Text)
What to watch: Watch whether the Treasury Department begins drafting preliminary guidance on formulaic proxies for illiquid private assets in anticipation of future legislative shifts Federal Wealth Tax Proposals.
What surprised us
- The "Small Billionaires" Gap: [NEW] Standard lists like Forbes miss a massive "small billionaire" tier. Applying a Pareto tail extrapolation reveals there are actually an estimated 617 billionaires in California—368 more than listed by Forbes—representing a massive, untapped tax base California 2026 Initiative.
- The $0 Tax Years of Tech Giants: [NEW] Despite generating billions in economic profits, prominent tech founders like Larry Page and Sergey Brin managed to pay exactly $0 in California individual income tax in multiple recent years, illustrating how easily the ultra-wealthy bypass traditional income taxation California 2026 Initiative.
- The Self-Defeating Nature of Repeal Initiatives: [UPDATED] The broad drafting of anti-income tax initiatives can accidentally trigger catastrophic legal challenges to existing payroll taxes and social programs. Rather than just rolling back a millionaires' tax, Washington's repeal measure threatens to dismantle unemployment insurance and long-term care funding Washington Constitutional Constraints.
Open threads
- Washington Initiative 26-645: The thread regarding the repeal of the 9.9% millionaires' tax remains active and is the central focus of the "What to watch" section in the Washington State analysis.