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Own Luxury Homes® California Tax Cost-of-Staying Index™
Own Luxury Homes® California Tax Cost-of-Staying Index™: California 13.3% top income tax rate on $1M+: $133,000/yr vs. FL $0. 20-year compounded wealth differential at $1M/yr income: ~$5.2M at 6% return. CA capital gains taxed as ordinary income at 13.3% (no federal preference): $665,000 on $5M gain vs. FL $0. CA FTB is the most aggressive domicile auditor in the U.S.; failed challenge = back taxes + 20% penalty + interest. Own Luxury Homes® 12-Point Agent Integrity Audit™.
Own Luxury Homes® California Tax Cost-of-Staying Index™
California’s 13.3% top marginal income tax rate is the highest state income tax in the United States. For a California resident earning $1 million per year, the decision to stay in California rather than establish Florida domicile costs $133,000 per year in avoidable state income tax. Over a 20-year career or professional horizon, at a 6% annual investment return on the tax savings, that decision compounds to approximately $5.2 million in foregone wealth. This Index quantifies the California cost-of-staying at each income tier, documents the California exodus migration data, and provides the framework for understanding when the California-to-Florida move is financially decisive.
01 — The California Cost-of-Staying by Income Level
| Annual Income | CA Tax (13.3% top rate) | FL Tax (0%) | Annual Cost of Staying in CA | 10-yr Cost (simple) | 20-yr Compounded Wealth Differential (6%) |
|---|---|---|---|---|---|
| $300,000 (9.3% bracket) | $27,900 (est.) | $0 | $27,900 | $279,000 | ~$1.0M |
| $500,000 (12.3% bracket) | $61,500 (est.) | $0 | $61,500 | $615,000 | ~$2.3M |
| $1,000,000 (13.3% bracket) | $133,000 | $0 | $133,000/yr | $1.33M (10yr simple) | ~$5.2M (20yr compounded) |
| $2,000,000 | $266,000 | $0 | $266,000/yr | $2.66M | ~$10.4M |
| $5,000,000 | $665,000 | $0 | $665,000/yr | $6.65M | ~$26.0M |
| $10,000,000 | $1,330,000 | $0 | $1,330,000/yr | $13.3M | ~$52.0M |
| $50M (top athlete endorsements) | $6,650,000 | $0 | $6,650,000/yr | $66.5M | ~$260M |
| CA tax estimated at effective rate by bracket; top rate 13.3% applies above $1M/$1.25M. 20-year compounded figure assumes tax savings invested annually at 6% return and compounds for the remaining life of the 20-year window. Actual results depend on investment returns and tax rates over the period. Consult a financial planner. | |||||
02 — The California Capital Gains Problem
Most states that have income tax offer favorable treatment for long-term capital gains — the federal preference rate of 0%, 15%, or 20%. California does not. California taxes long-term capital gains as ordinary income at the full 13.3% top rate.
The result: a California resident who sells $5M in long-term appreciated stock pays:
• Federal long-term capital gains: 20% → $1,000,000
• Federal net investment income tax (NIIT): 3.8% → $190,000
• California capital gains: 13.3% → $665,000
• Total tax on the $5M gain: $1,855,000 (37.1% combined rate)
The same $5M sale by a Florida-domiciled investor:
• Federal long-term capital gains: $1,000,000
• NIIT: $190,000
• Florida capital gains: $0
• Total tax on the $5M gain: $1,190,000 (23.8% combined rate)
The difference: $665,000 on a single transaction. For founders, executives, and investors with concentrated equity positions, the California capital gains exposure is often the most financially material single event in the domicile decision — exceeding even the ongoing income tax savings.
03 — California Domicile Change: The FTB Audit Challenge
The California Franchise Tax Board (FTB) routinely audits taxpayers who file a final California return after years of high income. The FTB has the authority and the motivation to challenge any domicile change that is not fully substantiated, and it uses sophisticated data-matching to identify taxpayers who may not have truly departed.
Red flags that trigger CA FTB domicile audit:
• Maintaining a California residence (even rented to others) after filing a final CA return
• California-based employment with continued visits to a CA office
• Children remaining in California schools
• Continued California professional licenses (bar, medical, CPA) as primary licenses
• Credit card and cell phone records showing sustained California presence post-departure
• Social media posts showing California activities after claimed departure date
A failed California domicile challenge results in the full CA income tax for the years in question, plus a 20% negligence penalty, plus interest. For a high earner, this can produce a multi-million dollar retrospective assessment.
The successful California domicile change requires the same genuine lifestyle change as the New York domicile change: selling or genuinely relinquishing the California residence, spending 183+ days outside California, and establishing authentic Florida domicile ties.
Brown, Ryan. “Own Luxury Homes® California Tax Cost-of-Staying Index™.” Own Luxury Homes®. https://www.ownluxuryhomes.com/markets/national/research-indices/california-tax-cost-of-staying-indexMedia: ownluxuryhomes.com/connect · 407-900-7030
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— Ryan Brown, Principal Broker & CEO, Own Luxury Homes® (FL License BK3626873)