Federal pushback on wealth tax retroactivity
Rep. Kevin Kiley (R-CA) introduced the "Keep Jobs in California Act of 2026" on 18 February, prohibiting states from levying retroactive taxes on individuals who no longer live there. The timing is pointed. California's Billionaire Tax Act, currently gathering signatures for the November ballot, would impose a one-time 5% tax on net worth for anyone who was a resident on 1 January 2026.
The tax targets approximately 200 individuals with combined wealth around $2 trillion. Revenue estimates sit at $100 billion over five years, with 90% earmarked for healthcare and 10% for education and food assistance. The catch: residency status on 1 January 2026 determines liability, even if you moved in February.
Who's leaving, who's staying
Meta's Mark Zuckerberg and Google co-founders Larry Page and Sergey Brin are reportedly planning departures ahead of the ballot. Gov. Newsom opposes the measure, citing potential ongoing income tax losses the Legislative Analyst's Office pegs at hundreds of millions annually, worst case $900 million if all targeted individuals relocate.
The initiative, filed November 2025 by SEIU-UHW, needs 90,000 signatures. Bernie Sanders is holding a rally Wednesday supporting the tax. Payment would be due in 2027, spread over five years, with deferrals available for illiquid assets.
Accounting implications
The proposed tax excludes real estate, pensions, and up to $5 million in assets. Standard apportionment assumes 100% liability for residents, with an alternative floor of 25%. Legal challenges are expected, with critics calling it a potential bill of attainder.
For practitioners with high-net-worth clients in California: residency planning around 1 January 2026 is the pressure point. The tax hinges entirely on that date. Kiley's federal bill faces uncertain prospects, but the political theatre is clarifying the stakes.
Municipal bond impact is expected to be minimal, according to the LAO. The debate continues whether a one-time windfall justifies trading permanent revenue streams for a symbolic wealth tax.