How California Taxes Your RSUs Even After You Leave the State

One of the most common surprises for people who leave California is a tax bill for RSU income long after the move. The reason is California Revenue and Taxation Code Section 17951: the state taxes income from California sources regardless of where you live when the income arrives.

For restricted stock units, California does not care whether you live in Phoenix, Las Vegas, or Austin when the shares vest. The state looks at where you worked between grant and vest and applies a mechanical formula, published in FTB Publication 1004, to decide what portion of the gain is California-sourced. That portion is taxable by California.

If you hold unvested equity and are considering a move, or you have already moved and a Franchise Tax Board notice just arrived, the allocation method below determines exactly what you owe.

How Does California Calculate Tax on RSUs After You Move?

California allocates each RSU tranche by workdays. The formula is:

California-Sourced Portion = (California Workdays from Grant to Vest) / (Total Workdays from Grant to Vest)

Workdays exclude weekends, holidays, and vacation. The same method applies to performance stock units, stock options, and other equity awards with a service period. California's Office of Tax Appeals affirmed the grant-to-vest allocation in the Appeal of Prince, so this is settled practice, not an aggressive FTB position.

Two details matter more than most articles admit. First, each vesting tranche is allocated separately, because each tranche has its own grant-to-vest period. Second, the allocation is fixed by your workday history, not by your move date or your intent. Once you have the dates, there is no judgment call.

A Worked Example: Four Tranches, One Move

You are an engineer in San Francisco. Your company grants you 80 RSUs on April 1, 2023, vesting 20 shares per year for four years. You work in California through December 31, 2024, then relocate to Phoenix on January 1, 2025. Your California workday period is 21 months of each grant-to-vest window. Using months as a proxy for workdays, the allocation per tranche:

Now the dollars, using the final tranche. Say the stock is $200 at vest in April 2027: 20 shares is $4,000 of ordinary income. California claims 43.8%, or $1,750. At a 9.3% marginal rate, the California tax is $163. Arizona taxes the full $4,000 at its flat 2.5%, which is $100. Because of the credit described below, your combined state tax is about $219. Had you stayed in California, the same tranche would cost $372.

A note on rates: California's 9.3% bracket covers single filers earning roughly $77,000 to $400,000. The 13.3% top rate people quote applies only above $1 million. Your allocation percentage matters more than the headline rate. You can run the vest-by-vest math on your own grants with your schedule and share price.

Does It Matter Whether You Move to Arizona, Nevada, or Texas?

The California-sourced share is identical in all three cases. What changes is the tax on everything else, and the credit mechanics.

Arizona taxes residents at a flat 2.5%, and it is one of California's four reverse-credit states. That flips the usual rule: instead of claiming a credit on your Arizona return, you claim the other-state credit on the California nonresident return, using Schedule S with Form 540NR. The net effect: you pay Arizona's 2.5% on the full gain, plus the rate difference on the California-sourced slice. Most tax software gets this wrong by default.

Nevada and Texas have no state income tax, so there is no credit to coordinate. You pay California on the California-sourced share and nothing on the rest. Grants made after your move, for work performed outside California, owe California nothing at all.

If Arizona is your destination, the sequencing of the move itself affects the allocation. I wrote a separate checklist on what to do before your equity vests when moving from California to Arizona.

Why Does the RSU Grant Date Matter More Than the Move Date?

The allocation is set by grant and vest dates, not the move date. This creates a trap for employees who do not plan ahead.

If you received a grant in June 2023 while working in California and moved to Arizona nine months later, California still claims 9 / 48 = 18.75% of a four-year grant's gain, on every tranche, through June 2027. The worst case is a large grant early in your California tenure followed by a quick move: two California years of a four-year grant hands California a claim on half the future gain, wherever the stock goes afterward.

The flip side: every workday outside California shrinks the ratio on later tranches. In the table above, California's claim falls from 100% to 43.8% across the four vests. Time out of state is the one variable that keeps working in your favor.

How Do You File Taxes If You Moved from California Mid-Year with RSUs?

File California Form 540NR as a part-year or nonresident, reporting only California-sourced income. File a full-year resident return in your new state. If that state is Arizona, claim the other-state credit on the California return under the reverse-credit rule above.

The common mistake is filing a full-year California return after moving, reporting all RSU income to California. That overpays California and creates an inconsistent record if the allocation is ever examined. The opposite mistake, reporting nothing to California, invites an FTB notice, because your employer's W-2 state wage boxes already told California about the vest.

Your residency change also has to hold up on its own. California looks at domicile facts, not just a new address. I covered the specifics in what California looks for when high earners establish Arizona domicile.

For the returns themselves, work with a CPA who handles multi-state allocation. I coordinate this analysis with clients' CPAs so the allocation, the credit, and the domicile record all tell the same story.

How Can You Reduce California Tax on RSUs After Moving?

You cannot un-source income already earned on California workdays. You can control timing, documentation, and what happens to future grants.

Time the move against the grant calendar

New grants issued after you leave, for work performed outside California, carry no California claim. If a refresh grant is coming, the difference between receiving it as a California employee and receiving it as an Arizona employee is the entire allocation. Where you have flexibility on a start date or a transfer date, model both.

Check your withholding after the move

Employers often keep withholding California tax on 100% of each vest after you move, or stop withholding California entirely. Both are wrong. Ask payroll to apply the allocation, and adjust estimated payments for the gap. RSU withholding is already short for high earners at the federal level; a wrong state split compounds it.

Keep a workday record

The allocation lives or dies on dates: grant dates, vest schedules, your last California workday, travel days back to a California office. Badge records, calendars, and a simple log settle an FTB inquiry quickly. Ambiguity is what turns a mechanical formula into a dispute.

How Much Can the California Allocation Cost You?

For someone vesting $120,000 of RSUs per year, the range is wide. If half the gain is California-sourced at a 9.3% marginal rate, California's claim is about $5,600 per year. Your total state bill lands between the pure-Arizona floor of $3,000 and the pure-California figure of $11,200, and it moves toward the floor with every year of Arizona workdays as old grants roll off.

That trajectory is the real planning insight. The first post-move year usually looks disappointing because most vesting tranches are still mostly California-sourced. By year three or four, new grants dominate and the California share approaches zero. Plan against the multi-year path, not the first tax return.

What Are the Most Common Multi-State RSU Tax Filing Mistakes?

• Reporting all RSU income to your new state and ignoring California. Your W-2 already reported California wages, so this invites an FTB notice with penalties.
• Reporting all RSU income to California after moving. This overpays and undermines your part-year filing position.
• Claiming the Arizona credit on the wrong return. For Arizona residents the other-state credit goes on the California 540NR, not the Arizona return.
• Treating all tranches as one blended allocation. Each tranche has its own grant-to-vest period and its own ratio.
• Losing the workday record. Without dates, you cannot defend the allocation you filed.
• Leaving employer withholding on autopilot. Payroll rarely applies the allocation correctly without being asked.

Frequently Asked Questions

Does California tax RSUs after you move to another state?

Yes. California sources RSU income by the ratio of California workdays to total workdays between grant and vest, per FTB Publication 1004. That share is taxable by California regardless of where you live at vest, and each tranche is allocated separately.

Do you get double-taxed on RSUs if you move from California to Arizona?

No, but the credit runs backwards. Arizona is a reverse-credit state, so the other-state credit is claimed on the California nonresident return. The net cost is Arizona's 2.5% on everything plus the rate difference on the California-sourced share.

Does moving to Nevada or Texas avoid California tax on RSUs?

Not for grants that began while you worked in California; the California-workday share stays taxable. The rest of the gain, and any grants made after the move, escape state tax entirely because Nevada and Texas impose none.

How do you file if you moved from California mid-year with RSUs?

File California Form 540NR reporting only California-sourced income, and a full-year resident return in your new state. Arizona residents claim the other-state credit on the California return. Keep grant dates, vest dates, and a workday log.