RSU Taxes When You Move States: The Complete Guide

Restricted stock units don't behave like a paycheck when it comes to state taxes. A paycheck is earned and paid close together, in the same place, so the question of which state gets to tax it rarely comes up. An RSU grant can vest one, two, or four years after it's awarded — long enough for an employee to move states once, twice, or more before the shares are ever taxable. When that happens, more than one state can have a legitimate claim on the same vest, and the rules governing which state gets what, and whether a move actually reduces the total bill, are poorly understood even by people who otherwise manage their finances carefully.

This guide covers the full picture: how RSU income actually gets sourced across states, what happens specifically to Californians who move away, how the credit system that's supposed to prevent double taxation works, and — the part almost nothing else explains clearly — the specific situations where that credit system doesn't actually help.

The Core Reframing: RSU Income Follows the Work, Not the Address

The starting assumption most people bring to this topic is that whichever state they live in on the vest date gets to tax the vest. That's true only if all of the underlying work was performed in that one state. If a grant vested over a period spanning a move, most states with an income tax — California, New York, Massachusetts, and New Jersey among the most active — apply a workday-based allocation formula: the share of the vest sourced to a given state equals that state's share of total workdays between the grant date and the vest date.

This means the state that gets to tax part of a vest is determined by where you were physically working during the entire vesting period, not by where you happen to live on the one specific day the shares become yours. See RSU State Sourcing for the full formula, what counts as a workday, and a complete worked example.

Why Employer Withholding Doesn't Solve This

Payroll withholding is almost always based on an employee's current state of residence at the time of vest — not on a multi-state allocation calculation. This creates a structural gap: an employee who moved from a high-tax state partway through a vesting schedule may have nothing withheld for that prior state at all when a later tranche vests, only to discover a real filing obligation, and a real balance due, well after the fact. For private-company double-trigger RSUs, this gap can be especially large, since the taxable vest date is tied to a liquidity event that may not occur for years after the time-based vesting condition is otherwise satisfied — by the time an IPO or acquisition finally triggers the second condition, the employee may have moved states multiple times since the grant date, with a correspondingly complex workday allocation to sort out across several jurisdictions.

California: The Most Consequential Case for Nauma's Audience

Given the concentration of Nauma's audience in or formerly in California, California's specific rule deserves particular attention. Under California Code of Regulations, Title 18, §17951-5 (implementing Revenue and Taxation Code §17951) and Franchise Tax Board Publication 1004, California sources RSU income based on the same grant-to-vest workday principle described above — and California is widely regarded as one of the more assertive states in the country at actually enforcing this rule against departed residents, not merely having it on the books.

The detail that surprises the most people: this claim survives regardless of how long ago someone left California, and regardless of how little current connection they have to the state. An engineer who left California for Texas five years ago, with zero California workdays since, can still owe California tax today on a vest occurring today, if a meaningful share of that grant's vesting period was worked in California years earlier. See Nonresident Equity Taxation: California's Rule for Equity You Earned There for California's specific filing mechanics (Form 540NR), a worked example modeled on the FTB's own published guidance, and a real Office of Tax Appeals case illustrating a known weakness in the standard allocation method.

The Credit That Usually Fixes Double Taxation — When It Applies

When a prior state sources part of a vest to itself, and the new state of residence also taxes that same income under its own resident-taxation rules, the mechanism that usually prevents paying full tax twice is a resident credit: the new state generally allows a credit for tax paid to the prior state, capped at what the new state itself would have charged on that portion. This works reasonably well moving between two states that both have an income tax. See Resident Credit for Taxes Paid to Another State for exactly how the calculation works, including a worked example and the cap that limits it.

The Scenario Almost Nothing Else Explains Clearly

Here is the single most important, and most commonly misunderstood, planning fact in this entire area: moving to a state with no income tax at all — Texas, Washington, Florida, Nevada — does not eliminate a prior high-tax state's sourced claim on equity earned before the move, and there is no credit available to offset it, because the new state has no tax liability for a credit to apply against. The resident credit mechanism only functions because there's a liability on the other side of the equation. A state with zero income tax has none. This means the prior state's sourced tax on that equity is simply owed, in full, with nothing reducing it — not a double-tax problem being "relieved," but a single, undiminished claim that a move to a no-tax state does nothing to address.

A second, related failure mode involves states with a "convenience of the employer" rule — most notably New York — which can source remote-work income to the employer's state rather than to where the work was actually performed, creating a genuine, sometimes only partially-resolved conflict between two states' competing sourcing theories. See When Double Taxation on Equity Compensation Isn't Actually Fixed by a Credit for both scenarios in detail, including worked examples.

A Practical Framework Before You Move

Given all of the above, the practical sequence for anyone with unvested equity considering a move between states is: identify every state where meaningful workdays will have occurred by the time each remaining tranche vests; determine which of those states applies a workday-sourcing rule (and whether the destination state has an income tax at all, since that determines whether a credit will be available later); keep contemporaneous records of workdays by state starting from the time a move is contemplated, not after the fact; and, for a large or complex multi-year grant spanning a move, get specific tax guidance before the move rather than after the first affected vest, since the planning options available beforehand are generally better than the cleanup options available afterward.

A Forward-Looking Note on Washington

Washington currently has no general income tax, though it has imposed a capital gains excise tax since 2022 on long-term gains above an annually adjusted threshold ($278,000 for 2025; the 2026 figure had not yet been published by the Washington Department of Revenue as of this writing). Separately, Washington's legislature enacted a new 9.9% flat income tax on household income above $1,000,000 (ESSB 6346, signed into law in 2026), scheduled to take effect January 1, 2028 — not yet in effect for the 2026 or 2027 tax years, but relevant for anyone modeling a multi-year relocation to Washington that extends into 2028 or beyond. This is worth revisiting specifically as that effective date approaches.

California Note

For a departing California resident, this entire guide is disproportionately about one state's rule, because California is both unusually active in enforcing it and unusually common as the departure point for Nauma's audience. The single most valuable habit for anyone in this position: treat the workday allocation as something to calculate and understand before a move affects an active grant, not as a surprise to discover at tax time years later. See Tax-Friendly States for Retirees for the broader California relocation tax picture beyond equity sourcing specifically, and Capital Gains Taxes for how California treats post-vest appreciation, which is sourced differently (generally to state of residence at time of sale) than the vest-date ordinary income covered throughout this cluster.

This article is for educational purposes only and does not constitute legal, tax, or financial advice. State sourcing, resident credit, and double-taxation rules for equity compensation are technical, fact-specific, and subject to change. Always consult a qualified tax advisor before or during a relocation that spans an active vesting schedule.