In brief
Proposition 3 would retain higher income tax rates that otherwise expire in 2031.
The state estimates the extension would generate $5 billion to $15 billion annually, depending on economic conditions.
Client planning should distinguish preserving existing rates from imposing an immediate new rate increase.
The sunset is the issue
California voters are being asked to make an existing high-income tax increase permanent. Proposition 3, on the November 3 ballot, would eliminate the scheduled 2031 expiration of higher rates first approved in 2012 and extended in 2016.
For CPAs, the important distinction is timing. This is not simply another immediate increase in the rate clients already pay. It is a decision about whether those higher rates remain in place after the current authorization ends. A projection that assumes a future rate reduction could need to change if voters approve the measure.
The proposal reaches a much broader population than the separate billionaire-tax debate. Reporting based on 2024 data puts the affected group at nearly 376,000 taxpayers. The official voter guide describes the existing higher rates as applying to the top 2% of California taxpayers.
What the state projects
The Legislative Analyst's official analysis estimates that Proposition 3 would bring in between $5 billion and $15 billion each year. The wide range reflects the sensitivity of high-earner income, including investment gains, to market conditions.
The same analysis says roughly 40% of the funding would go to schools and community colleges. The rest would support other state programs, with part set aside in budget reserves. That matters when explaining the measure: its fiscal effects are broader than an education-only extension.
The proposal remains a ballot measure, not enacted law. Client presentations should keep the current-law scenario separate from the scenario in which voters approve a permanent extension.
Revisit long-term income assumptions
Roth conversions, business exits and large investment sales can turn on a client's expected marginal rate in a future year. Where a plan assumes California rates fall after 2030, the firm should identify that assumption explicitly and test what happens if they do not.
That does not make accelerating income the automatic answer. Federal taxes, investment risk, cash needs and the client's expected future income still matter. A rate projection is one input, not permission to manufacture a transaction before the election.
Advisors should also avoid turning a residency discussion into a simplistic comparison of state tax rates. Moving involves factual and legal questions, as well as family and business consequences. Tax counsel and the client's other advisors should be involved before a relocation strategy is treated as settled.
A practical client conversation
Start with clients whose multiyear plans rely on the sunset. Show both outcomes, document which transactions are genuinely flexible and identify what would warrant revisiting the plan after the vote.
The useful service is not predicting the election. It is making sure a client's tax strategy does not depend on an expiration date that voters may remove.
