California vs. Texas vs. Washington: The Real Tax Savings for Tech Workers

The Headline Number and Why It Is Misleading

California's top marginal income tax rate is 14.4% when you include the 1% Mental Health Services Act surcharge on income above $1 million. Texas and Washington impose zero state income tax. On $500,000 of W-2 income, the nominal difference is $50,000 to $60,000 per year in state taxes alone. That number is real, but the actual savings from relocating are far more nuanced, especially for tech employees whose compensation is heavily weighted toward equity.

The three factors that erode the headline number: California's sourcing rules for equity compensation, property tax differences, and the cost of relocating to a market that may not be as cheap as you assume.

How California Taxes Equity After You Leave

RSU Allocation

California sources RSU income to the state where you performed the services that earned the RSUs. The formula is straightforward but punishing: California taxes the portion of each RSU vest allocated to your California work period, regardless of where you live when the shares actually vest.

If you received a four year RSU grant while working in San Francisco and moved to Austin after two years, California still taxes 50% of the remaining vests. The allocation is calculated as (days worked in California from grant to vest) / (total days from grant to vest). Moving does not eliminate California's claim on equity you earned while physically present in the state.

Only RSU grants awarded entirely after you establish residency and employment in another state escape California taxation completely.

Stock Option Exercise

The same allocation formula applies to stock options, but the math can be even worse. California taxes the spread on option exercise (fair market value minus strike price) based on your California work period from grant date to exercise date.

If you worked in California for three of the four years between grant and exercise, California taxes 75% of the spread, even if you exercised the options from your home office in Seattle. On a $1 million spread, that is $108,000 in California state tax on income you realized after leaving.

A Concrete Comparison: Senior Engineer With $950K Total Income

Consider a senior engineer (L6/E6 equivalent) with $250,000 base salary, $200,000 in annual RSU vests, and $500,000 in stock option exercises. Here is the state tax picture across three scenarios:

The Texas resident who moved two years ago still owes California approximately $25,000 on equity income allocated to their California work period. The savings are real ($95,000 less than staying), but they are not the $120,000 you might expect from the "zero income tax" headline.

Property Taxes Narrow the Gap Further

Texas compensates for zero income tax with property taxes averaging 1.6% to 2.2% of assessed value. California's Proposition 13 caps the base rate at roughly 1% of purchase price with annual increases limited to 2%.

On a $1.5 million home, the Texas property tax bill eats $13,500 to $22,500 of your income tax savings every year. Over a decade, that is $135,000 to $225,000 in additional property taxes that the headline "zero income tax" comparison ignores.

Washington fares better here, with property taxes only modestly higher than California's Prop 13 rates. However, Washington's capital gains tax of 7% on gains above $270,000 (enacted in 2022 and upheld by the state Supreme Court) adds a layer of complexity for employees selling concentrated stock positions.

The SALT Deduction Cap Makes California Even More Expensive

The $10,000 cap on state and local tax (SALT) deductions means high earning California residents cannot deduct most of their state tax burden on their federal return. A California resident paying $120,000 in state income tax can only deduct $10,000 federally, leaving $110,000 as a pure cost with no federal offset.

Before the SALT cap (pre-2018), that same $120,000 in state taxes would have generated a federal deduction worth approximately $44,400 (at the 37% bracket), reducing the effective cost to roughly $75,600. The SALT cap increased the true cost of living in California by tens of thousands of dollars annually for high earners.

This makes the comparison even more favorable for Texas and Washington residents, who have minimal SALT deductions to lose.

California's Departure Audit: The FTB Is Watching

California's Franchise Tax Board (FTB) aggressively audits high earners who claim to have left the state. The stakes are high: if the FTB determines you are still a California resident, you owe tax on your entire worldwide income, plus penalties and interest.

The FTB examines a comprehensive set of factors to determine your "closest connections":

• Physical presence: Where do you spend the majority of your days? California uses a "safe harbor" of fewer than 45 days per year, but exceeding it does not automatically make you a resident.
• Family: Where do your spouse and children live? If your family stays in Palo Alto while you rent an apartment in Austin, the FTB will argue your domicile never changed.
• Professional connections: Where is your employer? Do you return to a California office regularly?
• Personal ties: Where are your doctors, dentists, accountants, and religious community? Where do you vote? Where is your driver's license registered?
• Financial connections: Where are your bank accounts, safe deposit boxes, and investment advisors?

A "paper move" where you update your mailing address but maintain your life in California will fail an audit. The FTB has the resources and the financial incentive to pursue these cases, particularly for returns showing equity compensation in the hundreds of thousands.

When Relocation Genuinely Makes Financial Sense

The math favors relocation when several conditions align:

1. You are moving for career or lifestyle reasons and the tax savings are a bonus, not the sole motivation. This also makes your case stronger if the FTB audits your departure.

2. You have no existing California sourced equity, or the remaining California allocated vests are minimal. If you are sitting on three years of unvested RSUs granted in California, the tax benefit of moving is significantly diluted until those grants fully vest.

3. You are joining a new employer in the new state. All future equity grants will be sourced entirely to your new state, giving you a clean break from California's allocation formula.

4. The total cost of living comparison favors the move. Model everything: state income tax, property tax, sales tax, housing costs, insurance, childcare. Austin and Seattle are no longer the bargain alternatives they were in 2019. Median home prices in both metros have risen 40% to 60% since 2020.

5. You are genuinely relocating. Your family moves, your children change schools, you establish medical care and community ties in the new state. Half measures create audit risk without delivering the full tax benefit.

The Bottom Line

The tax savings from leaving California are real, but they are not as large as the difference between a 14.4% rate and 0%. For a senior tech employee with $200,000 or more in California sourced equity compensation, the first several years after a move may still involve meaningful California tax obligations. Property taxes in Texas claw back a significant portion of the income tax savings. And the FTB will scrutinize whether your move is genuine.

Model the full picture: five years of projected income, equity vesting schedules with California allocation percentages, property taxes in your target market, the SALT deduction impact, and total housing costs. The answer is different for every household, and the employees who benefit most are those who plan the transition carefully rather than reacting to a headline tax rate.