The short version
Moving before an option exercise or stock payout can change a state tax calculation, but it does not necessarily remove the state where the award was earned. The review has to establish your actual residency, identify the kind of award, and determine which work period each state uses to source the income.
California and New York illustrate why one payroll percentage can be misleading. Their rules can use different periods for the same kind of option, and compensation can follow different rules from a later investment gain. A pre-move review should model those differences before the exercise or payout, rather than treating an address change as the tax plan.
What the state rules actually say
California regulation 18 CCR 17951-5 addresses a nonresident employee’s compensation for California services. Where services occur inside and outside the state, the compensation must be allocated appropriately. Becoming a nonresident does not erase compensation attributable to earlier California work.
New York regulation 20 NYCRR 132.24 specifically addresses stock options, stock appreciation rights, and restricted stock. It uses a New York workday fraction for the applicable allocation period and connects recognition to the federal income inclusion. The allocation period may span multiple years, including years when the employee was a resident.
Residency is a separate question that comes first. California’s part-year and nonresident guidance distinguishes worldwide income during the resident period from California-source income during nonresidency. New York’s residency guidance likewise distinguishes resident and nonresident taxation. A new mailing address or voter registration does not, by itself, establish that a New York domicile has changed.
The Firm’s review therefore distinguishes an intended move from a supported change in tax status. Homes, work arrangements, family circumstances, travel records, and the relevant state’s rules belong in that analysis. This article uses California and New York examples; it is not a rulebook for every state.
The award determines which workdays matter
For a nonstatutory stock option, also called a nonqualified option, California’s Publication 1004, section C describes a reasonable time-allocation method running from grant to exercise, or to termination of employment if earlier. The numerator is California workdays and the denominator is total workdays during that period. The publication is revised January 2015 and remains available through the state’s current equity and residency guidance; its date should not be mistaken for the year of your award.
For a nonstatutory option without a readily ascertainable value at grant, New York’s regulation generally ends the allocation period when all service-related exercise conditions have been satisfied, meaning employment vesting. Later service before exercise ordinarily does not extend that period. An option vested when granted has a different allocation rule. California’s described grant-to-exercise method should not simply be copied onto a New York return.
Restricted stock and restricted stock units require separate review. California’s Publication 1004 describes a purchase-to-vesting period for restricted stock under its time method, stopping at earlier employment termination, and its summary table uses a grant-to-vesting service period for restricted stock units. New York’s regulation addresses restricted stock and changes the allocation treatment when a section 83(b) election was made. The specific instrument and its tax-recognition date must be established before using a workday ratio.
Remote work also needs more than a calendar label. New York’s telecommuting guidance explains that a nonresident with a primary New York office may have out-of-state telecommuting days treated as New York workdays unless the applicable employer-office requirements are met. An employee should not automatically remove every home-office day from the New York numerator.
A move can leave a substantial compensation allocation
Consider a hypothetical employee who leaves California, establishes genuine nonresidency, and later exercises a nonstatutory option into fully vested shares. Assume the option had no readily ascertainable value at grant, no special deferral applies, employment continues through exercise, and the exercise produces $200,000 of compensation.
The employee worked 300 California days and 200 days elsewhere from grant through exercise. Under the time method described in Publication 1004, the California fraction is 300 divided by 500, or 60%. The California-source compensation is $120,000. These are assumed workday facts and an allocation result, not a tax bill or a finding about a real client.
If the employee later sells the shares, that sale is a separate event. Its gain, residence at sale, and applicable state rules must be examined separately. The same 60% is not automatically applied to all later investment gain. Conversely, moving after exercise cannot retroactively change where compensation had already been recognized while the employee was a resident.
Numbers in the official illustrations
Scroll the table sideways to read all columns, including sources.
| Official example | Calculation in the source | Authority |
|---|---|---|
| California nonstatutory option allocation | 700 California workdays out of 1,000 total workdays produces 70% California-source compensation | California Franchise Tax Board (FTB), Publication 1004, section C, Example 3 |
| New York nonstatutory option allocation | 720 New York workdays out of 1,200 total workdays produces a 60% fraction | 20 NYCRR 132.24(d), Example 1 |
| New York income amount in that example | 60% of $70,000 compensation is $42,000 of New York-source income | 20 NYCRR 132.24(d), Example 1 |
These are separate official teaching examples with different employees and facts. They demonstrate allocation mechanics, not an estimate of your likely state tax.
Federal capital-gain treatment does not end the state review
New York’s regulation contains an additional trap for statutory options. Even when the federal return reports capital gain, New York can treat a specified portion as compensation for its sourcing calculation. Section 132.24(c)(1) generally limits that amount to the lesser of the exercise spread or the gain actually recognized. The applicable workday fraction then matters. A federal capital-gain label does not by itself establish that the entire amount escaped New York sourcing.
California’s Publication 1004 describes different treatment for a qualifying sale of incentive-stock-option shares while a nonresident and separately addresses the alternative minimum tax adjustment at exercise. The state analyses must be done independently. This is also why a federal projection alone cannot answer which state returns are needed.
Credits may reduce overlapping state tax, but they are not automatic. California’s Schedule S instructions impose residency, source, and other requirements for the other-state tax credit. The review must identify which state allows a credit, the income and tax covered, and any limits. It should not assume that two state liabilities will cancel each other.
Related reading
One Stock Option, Two Sourcing Periods compares federal international sourcing with California’s option method. It uses a specific nonstatutory-option example and explains why the federal and state periods should be recorded separately.
FEIE Is Federal, State Tax Is Separate explains why the foreign earned income exclusion, a federal provision, does not settle state residency, conformity, sourcing, or credits. A move abroad therefore adds another layer of review rather than resolving the state equity question automatically.
How Sheepdog Tax can help
Contact noah@sheepdogtax.com with the states involved, the award type, and the expected move and payout dates. Sheepdog Tax can discuss a scoped review of residency evidence, grant and employment records, workday allocations, projected payments, and the resulting filing obligations. The Firm can identify where additional state or legal advice is needed.
Sheepdog Tax is a veteran-owned practice led by Noah Green, Certified Public Accountant (CPA) and Certified Fraud Examiner (CFE). A move does not guarantee a particular tax result. The conclusion depends on the applicable law and the facts supported by the records.
Sources
- California regulation 18 CCR 17951-5, nonresident compensation for services.
- New York regulation 20 NYCRR 132.24, equity compensation, workday fractions, and Examples 1 to 3.
- California FTB, Part-year resident and nonresident, residency-period and source distinctions.
- New York, Frequently Asked Questions about Filing Requirements, Residency, and Telecommuting, domicile, source, and remote-work guidance.
- FTB Publication 1004, Equity-Based Compensation Guidelines, revised January 2015, sections C to E and summary table.
- California Schedule S instructions (2025), other-state tax credit requirements.
Prepared by Noah Green, CPA, CFE.