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State Wealth Tax Showdown: The 2026 Billionaire Tax Act vs. Federal Law

Can a state continue to tax your wealth long after you pack up and move to a different part of the country?

That scenario is sparking a major showdown over California’s proposed 2026 Billionaire Tax Act. This ballot initiative attempts to levy a one-time 5% tax on the global net worth of billionaires claiming California residency as of January 1, 2026.

Advocates claim it will generate massive healthcare funding. Opponents caution it will drive wealthy taxpayers out of the state while attempting to capture revenue from individuals who no longer live there.

Now, federal lawmakers are stepping in.

Understanding the 2026 Billionaire Tax Act

If voters approve this initiative on the November 2026 ballot, the legislation would:

  • Levy a one-time 5% excise tax

  • Target individuals or trusts with a net worth of $1 billion or more

  • Establish January 1, 2026 residency status as the benchmark

  • Apply to worldwide assets

Revenue would primarily fund healthcare programs, with the remainder supporting food assistance and education.

Based on projections from the California Legislative Analyst’s Office (LAO), the proposal could yield “tens of billions of dollars” starting in 2027. Yet, the LAO also warned it might trigger a permanent drop in state income tax—potentially hundreds of millions annually—if targeted taxpayers simply relocate.

Tax planning and wealth management

Federal Intervention: Keep Jobs in California Act

To counter this aggressive state-level taxation, U.S. Representative Kevin Kiley introduced the Keep Jobs in California Act (H.B. 7619).

This federal legislation explicitly prevents states from enforcing retroactive taxes on a nonresident’s assets for a timeframe preceding the tax’s enactment if they officially moved.

Representative Kiley called the proposed state wealth tax an “unprecedented attempt” to retroactively tax former residents. Importantly, the federal bill draws a hard line against post-departure asset taxation, though it does not shield current residents from localized tax policies.

Legal Hurdles of Retroactive Taxation

At CPA Consulting Services, we help business owners and individuals across Connecticut navigate multi-state tax filings. We know firsthand that taxing former residents introduces steep constitutional hurdles. Legal analysts point to several glaring issues:

  • Due Process protections

  • The constitutional right to travel

  • Commerce Clause limitations

  • The scope of state authority to tax worldwide assets

California already deploys intense residency tests scrutinizing physical presence and intent. Taxing individuals after they relocate will undeniably spark immediate litigation.

CPA analyzing state tax residency laws

Migration Risks and Competing Measures

California relies heavily on top earners in technology and entertainment. The LAO openly recognized that taxpayer flight could severely erode revenues, highlighting the core debate: securing short-term cash versus risking permanent tax base depletion.

Adding to the chaos, multiple competing ballot initiatives could derail the billionaire tax by proposing to:

  • Raise the voter threshold to two-thirds for new one-time taxes

  • Prohibit new taxes on personal savings and retirement assets

  • Clarify residency rules for nonresidents and part-time residents

  • Increase fiscal transparency measures

This clash between California’s ambitions and the federal Keep Jobs in California Act is shaping up to be a historic constitutional battle.

For everyday taxpayers—whether you need IRS resolution for back taxes or advice on how to lower self-employment taxes—the lesson is clear: Residency is not just a mailing address. It can determine whether your wealth is taxable, even after you move.

Need straightforward guidance on how state residency impacts your specific financial picture? Contact Gene Turley and the team at CPA Consulting Services in Manchester, CT, to schedule a consultation.

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