California's Proposed Billionaire Tax: Can the State Tax You After You Move?

We often have conversations with clients who are considering relocating to lower-tax states to protect their assets. But what happens if your former state tries to tax your wealth long after you pack up and leave?

That is the exact scenario sparking a massive legal clash over California’s proposed 2026 Billionaire Tax Act. The ballot initiative seeks to slap a one-time 5% tax on the global net worth of billionaires who claim California residency as of January 1, 2026. While proponents champion the measure as a funding source for healthcare and social programs, critics are sounding the alarm over its attempt to reach across state lines and tax former residents.

Now, federal lawmakers are stepping in to halt the reach of post-departure taxes.

Inside the Proposed 2026 Billionaire Tax

If supporters successfully land this measure on the November 2026 ballot and voters approve it, the legislation would:

  • Levy a one-time 5% excise tax
  • Target individuals or trusts holding a net worth of $1 billion or more
  • Assess global assets using January 1, 2026 as the strict residency benchmark date

According to the California Legislative Analyst’s Office (LAO), this aggressive move might generate “tens of billions of dollars” starting in 2027. Yet, the LAO also cautioned that a subsequent exodus of high-net-worth taxpayers could drain hundreds of millions annually from the state’s regular income tax base.

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The Federal Block: The Keep Jobs in California Act

Pushing back against this state-level maneuver, U.S. Representative Kevin Kiley introduced the Keep Jobs in California Act (H.B. 7619). This federal bill is designed to block states from enforcing retroactive taxes on the assets of nonresidents who have already relocated.

Congressman Kiley labeled the wealth tax an “unprecedented attempt” to penalize those who have severed ties with the state. The legislation does not stop states from taxing current residents; instead, it creates a firewall against retroactive asset taxation.

Legal Hurdles and State Revenue Risks

Attempting to tax out-of-state wealth opens a constitutional hornets' nest. Legal experts are already flagging potential violations of Due Process, the Commerce Clause, and the fundamental right to travel.

Adding to the complexity, competing ballot measures could completely undermine the wealth tax by raising the voter threshold for new one-time taxes to two-thirds or strictly protecting personal retirement assets and savings.

Protect Your Wealth Through Proactive Planning

Whether this federal bill passes or the California initiative advances, the core takeaway for high-net-worth taxpayers is clear: Residency is far more than where you receive your mail. It dictates how and when your wealth is taxed.

Before you make a major cross-border move, reach out to our team. Let’s sit down and review your comprehensive tax strategy to ensure your assets stay protected from surprise state levies.

Let's Chat!
If any of these topics caught your attention, please contact to start the conversation!
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