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California · moving out

Leaving California: how to cleanly break residency before a liquidity event

California residency audits are real, especially in the year of a large equity sale. Domicile factors, workday sourcing for trailing grants, and the minimum-stay counter-claim from your destination state.

What California residents actually pay

California taxes ordinary income at a top marginal rate of 13.3%. RSU settlement value, NSO exercise spread, and ESPP discount income all count as ordinary wages for this purpose and flow through the state's normal brackets.

Calculates its own state AMT; one of the most expensive states for ISO exercise.

Establishing the break

Leaving California cleanly for tax purposes means proving you changed domicile, not just changed address. Domicile audits look at: where you vote, where you hold your driver's license, where your doctors and dentist are, where your family lives, where you spend holidays, whether you sold (or stopped using) your California residence. California is the most aggressive auditor.

Trailing-grant rules

Even after a clean break, most high-tax states claim a workday-sourced share of equity that vested after you moved but was earned while you were a resident. Plan the move timing around known vesting and exercise events; moving in January before a year of vesting is cleaner than moving in June mid-vest.

Records to keep

Three years of records, minimum. Calendar (for day-count defense), payroll history (showing work location each pay period), real estate transactions, travel receipts, medical and professional records. If audited, the burden is on you to prove the new residency.

Frequently asked

Does California tax RSU income the same as wages?
Yes. California treats RSU ordinary income as wages, taxable at the state's top marginal rate of 13.3%. Supplemental-wage federal withholding (22%, or 37% above $1M YTD) does not adjust for state withholding, so you often owe extra at filing.
What happens if I exercise ISOs while living in California?
California calculates its own AMT on top of federal AMT, so large ISO exercises can trigger two AMT bills. Plan the disqualifying-vs-qualifying disposition decision with both layers in mind.
I moved to California from another state. Who taxes my vesting RSUs?
Most high-tax states (CA, NY, MA) source RSU ordinary income to workdays between grant and vest. If your grant pre-dates your California move, expect the old state to tax the portion of each tranche attributable to workdays earned there. California taxes the remainder.
Can I reduce California taxes by timing my RSU sales?
California taxes long-term capital gains at the same rate as ordinary income, so timing alone does not produce a state savings — only federal. Holding for 12 months still halves the federal rate on gains above basis.

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