Billionaire Wealth Tax & Migration Simulator

Policy Presets

Tax Parameters

Wealth Tax Rate 5.0%

Annual or windfall assessment levied on net worth exceeding the exemption line.

Exemption Floor $1.0 Billion

Only wealth above this threshold is taxable. Covers California's 246 billionaires.

Behavioral & Migration Dynamics

Relocation Elasticity Moderate (0.55)

Sensitivity of billionaires to change tax domicile to Texas, Florida, or Nevada.

Exit Enforcement & Clawback

Legal friction delaying tax avoidance via residency change.

Lost Baseline Income Tax / Head $28 Million

Average annual CA personal income & capital gains tax surrendered for each departed billionaire.

Year 1 Gross Wealth Tax$38.4B
From remaining CA cohort

Billionaire Relocations

37 / 246

15.0% flee to TX/FL/NV

Lost Baseline Annual Tax

$1.04B

Recurring income & cap gains

5-Year Cumulative Net+$164.2B
Net windfall after tax-base erosion

Cohort Distribution: California's 246 Billionaires

Each node represents one billionaire. Position indicates net worth; color indicates residency decision.

Remaining in CA Relocated (TX / FL / NV) Under Exemption

5-Year Net Fiscal Trajectory ($ Billions) Gross Wealth Tax vs Cumulative Base Erosion

Destination State Allocation Where departing billionaires relocate

Billionaire Cohort Wealth Tier Analysis

Pareto-distributed California wealth model

Tier Range	Billionaires	Total Wealth	Taxable Wealth	Est. Departures	Wealth Tax Raised	Status

The Mechanics of California's Billionaire Wealth Tax Debate

The proposal highlighted by the Financial Times envisions a 5% windfall tax on net worth exceeding $1 billion, aimed at California’s 246 billionaires. While the prospective one-time or recurring revenue is immense—potentially generating tens of billions in year one—the core policy dilemma hinges on interstate tax elasticity. Because California does not operate with federal borders or currency sovereignty, high-net-worth individuals have the constitutional right to re-establish domicile in zero-income-tax states like Texas, Florida, or Nevada.

The Laffer Curve for Super-Wealth

California's top 1% of earners already generate over 45% of total state personal income taxes. If a wealth levy prompts even 15% to 20% of ultra-wealthy founders and investors to relocate, the state permanently forfeits their annual ordinary income tax, capital gains realizations, and consumption taxes.

The Contagion Hypothesis

If peer progressive economies—such as New York, Washington, and Massachusetts—coordinate wealth levies or if federal minimum taxes align, the incentive to flee is substantially blunted. Conversely, if Texas and Florida aggressively market their absence of wealth and income taxes, unilateral state policies face elevated capital flight.

Exit Friction & Legal Enforceability

Proponents of state wealth taxes often include multi-year lookback provisions or exit surcharges. However, legal scholars debate whether state-level exit taxes violate the Commerce Clause or the Privileges and Immunities Clause of the U.S. Constitution. If an exit tax is struck down by federal courts, relocation friction collapses to zero, accelerating departures to states with statutory protections against wealth taxation.

How to Interpret the Model

This simulator combines Pareto-distribution wealth modeling for California’s 246 billionaires with empirical migration elasticity functions derived from recent high-earner mobility studies. By adjusting the tax rate, exemption threshold, and exit tax assumptions, users can observe the exact tipping point where gross wealth tax collections are overwhelmed by the long-term erosion of California's baseline income tax receipts.