Please note: We DO NOT offer free tax advice for TurboTax users or self-preparers.

The Federal Fight Over California’s Wealth Tax: Can States Tax You After You Leave?

Relocating to a new state often comes with the expectation of leaving your old tax obligations behind. But what happens when a state attempts to tax your assets long after you have moved away?

This unprecedented scenario is the focal point of a major legal and political clash surrounding California’s proposed 2026 Billionaire Tax Act. The ballot initiative seeks to levy a one-time 5% tax on the worldwide net worth of billionaires who claim California residency as of January 1, 2026.

Advocates believe this measure could generate substantial funding for social programs. Conversely, critics argue it crosses a dangerous line by trying to tax individuals who have already established domicile elsewhere, potentially sparking an exodus of high-net-worth taxpayers. Now, lawmakers in Washington are stepping in.

Inside the Proposed 2026 Billionaire Wealth Tax

Proponents are aggressively campaigning to get this initiative on the November 2026 ballot. If voters pass the measure, it would:

  • Levy a one-time 5% excise tax on total wealth.

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

  • Utilize January 1, 2026 as the pivotal benchmark date for residency.

  • Assess taxes on global assets, regardless of where they are held.

State Capitol Building

Based on projections from the California Legislative Analyst’s Office (LAO), this wealth tax could generate “tens of billions of dollars” over several years starting in 2027. Yet, the LAO also cautions that this aggressive tax strategy could result in a permanent reduction of standard state income tax revenue—potentially hundreds of millions of dollars annually—if affluent taxpayers permanently relocate.

Federal Intervention: The Keep Jobs in California Act

To counteract this post-departure taxation effort, U.S. Representative Kevin Kiley (R-CA) introduced the federal Keep Jobs in California Act (H.B. 7619).

This federal legislation would explicitly block any state from enforcing a retroactive tax on the assets of a nonresident for any period before the tax was signed into law, provided the individual no longer lives in that state. While states maintain the authority to tax current residents, this bill targets the controversial practice of retroactive asset taxation across state lines.

Constitutional Concerns and Revenue Risks

Taxing former residents opens up a myriad of constitutional disputes. Legal scholars point to potential violations of Due Process, the Commerce Clause, and the fundamental constitutional right to travel.

Financial Planning Meeting

Furthermore, competing ballot measures are emerging to either complicate or block the billionaire tax entirely. These include proposals to raise the voter approval threshold to two-thirds for new one-time taxes, clarify non-resident rules, or strictly prohibit taxing personal savings.

Protect Your Wealth with Proactive Tax Planning

If this California dispute proves anything, it is that residency is much more than a mailing address—it is the foundation of your entire tax profile. Whether you are managing complicated IRS issues, navigating state tax disputes, or seeking proactive tax planning for business owners, you need experienced guidance.

At Steve Shapiro, EA CTRC in Saint Charles, Missouri, we leverage 40 years of financial expertise to protect your assets and resolve complex tax burdens. From comprehensive tax resolution to strategic planning, our team is here to help you navigate an ever-shifting tax landscape. Contact us today to secure your financial future.

Share this article...

Want our best tax and accounting tips and insights delivered to your inbox?

Sign up for our newsletter.

I confirm this is a service inquiry and not an advertising message or solicitation. By clicking “Submit”, I acknowledge and agree to the creation of an account and to the and .
Have a question? Check out the frequently asked questions below.
Hi there! Welcome to Steve Shapiro, EA website. For any questions not listed here, use the Ask Me A Question form and one of our staff will reach out to you.
Please fill out the form and our team will get back to you shortly The form was sent successfully