The Two-Bucket Framework — Why RSU Sale Income Is Not One Number
When you sell RSU shares after they have vested, the total proceeds represent two economically and legally distinct components, each with its own tax treatment, its own sourcing rule, and its own filing obligation.
Bucket 1 — The W-2 Portion (Vest-Date Value): This equals the fair market value of the shares on the date they vested, multiplied by the number of shares. This amount was already included in your W-2 as ordinary compensation income in the year of vesting — it represents payment for services performed during the grant-to-vest period. For multi-state allocation purposes, this income is sourced using the workday fraction method: each state where you worked during the grant-to-vest period claims a share proportional to the workdays spent there. This sourcing is permanent — it does not change based on where you live when you eventually sell the shares.
Bucket 2 — The Capital Gain Portion (Post-Vest Appreciation): This equals the difference between the sale price and the vest-date fair market value (the amount already taxed as Bucket 1). This is a capital gain — taxed federally as either short-term (ordinary rates) or long-term (preferential 0/15/20% rates) depending on how long you held the shares after vesting. For state tax purposes, this gain is sourced to your state of residence at the time of the sale — completely independent of where you worked during the grant-to-vest period.
The critical insight: moving to a no-tax state changes the sourcing of Bucket 2 going forward, but has zero effect on Bucket 1's sourcing for any grant where workdays were performed in a source-rule state like California or New York. Bucket 1's tax obligation to your former state is fixed at the moment of vesting and follows the shares — and you — until that income is reported and taxed.
Key Highlights
- RSU sale income splits into two buckets: the W-2 portion (vest-date FMV, sourced by workday fraction to grant-period work states — permanent) and the capital gain portion (sale price minus vest-date FMV, sourced to your residence at time of sale).
- California's FTB Publication 1004 codifies the workday-fraction allocation: California workdays from grant date to vest date ÷ total workdays in that period = the California allocation ratio applied to total vest income.
- California's claim on the Bucket 1 portion does not expire when you move. Former California residents file Form 540NR reporting California-sourced wages for the relevant grant in the year those shares vest — and FTB Publication 1100 governs the broader nonresident sourcing framework, including capital gains and passive income after a residency change.
- New York applies a 14-day de minimis threshold: fewer than 14 workdays in New York during the grant-to-vest period exempts that grant's entire vest income from New York sourcing. At 14 or more workdays, New York applies the standard workday fraction on Form IT-203.
- Capital gains (Bucket 2) are sourced to your state of residence at the time of sale — not to your former work states. A Texas resident who sells shares that vested while they were a California resident owes zero Texas tax (no income tax) and zero California tax on the post-vest appreciation.
- The holding period for federal long-term vs short-term capital gains treatment begins on the vest date — not the grant date. A sale within 12 months of vesting is short-term, taxed at ordinary federal rates regardless of how long you held the underlying grant before vesting.
- Most resident states provide a credit for taxes paid to another state on the same income — California uses Schedule S (Form 540), New York uses Form IT-112-R — preventing full double taxation but typically capping the credit at the lower of the two states' effective rates on that income.
- The resident-state credit applies to Bucket 1 income when your new resident state also claims a piece of that income (uncommon, since most Bucket 1 income belongs entirely to former-work states) — but more commonly applies when a current resident sells shares that have multi-state Bucket 1 sourcing from a prior job change within states that both tax income.
- Single-trigger RSUs are taxed as they vest, on the normal grant-to-vest schedule, regardless of any later liquidity event. Double-trigger RSUs (common pre-IPO) vest only upon a liquidity event (IPO, acquisition) — but the grant-to-vest period for workday-fraction purposes still runs from the original grant date to the actual vesting date, which may be years after the original grant.
- Each RSU grant requires its own separate Bucket 1 calculation and its own separate Form 540NR (or equivalent) for the vest year — grants cannot be merged across different grant dates or different vesting schedules.
California vs New York — Trailing Tax Rules Side by Side
California and New York are the two states most likely to generate a trailing tax obligation for technology and finance employees who relocate. Their rules share the workday-fraction foundation but differ meaningfully in threshold rules, filing forms, and audit posture.
| Feature | California | New York |
|---|---|---|
| Governing authority | FTB Publication 1004 (Equity-Based Compensation Guidelines); FTB Publication 1100 (Taxation of Nonresidents and Individuals Who Change Residency) | TSB-M-95(3)I and TSB-M-12(5)I (stock-based compensation allocation guidance); 20 NYCRR 132.18 |
| De minimis threshold | None — any California workdays during the grant-to-vest period create a California allocation, however small | 14-day rule: fewer than 14 New York workdays during the grant-to-vest period = $0 New York-sourced income for that grant |
| Allocation formula | California workdays from grant date to vest date ÷ total workdays from grant date to vest date × total vest income | (If ≥14 NY workdays) New York workdays ÷ total workdays in grant-to-vest period × total vest income |
| Filing form for non-residents | Form 540NR (California Nonresident or Part-Year Resident Income Tax Return) — required for the year of vest, and again if the FTB requires reporting capital gains separately at sale | Form IT-203 (Nonresident and Part-Year Resident Income Tax Return) — required for the year of vest if the 14-day threshold is met |
| Trailing obligation duration | Indefinite — the California-sourced fraction of any grant with California workdays remains taxable whenever that grant vests, regardless of years elapsed since departure | Indefinite for the same reason — but the 14-day threshold means many grants with limited NY travel generate zero NY trailing obligation in the first place |
| Capital gains (Bucket 2) treatment | Sourced to residence at time of sale — California does not claim Bucket 2 for non-residents under Publication 1100's general framework for capital gains after a residency change | Same principle — NY does not extend the workday fraction to post-vest capital gains for non-residents at time of sale |
| Local/city add-on | None — California has no city-level income tax | New York City adds its own income tax (up to ~3.876%) on New York-source income for NYC residents during the relevant period |
| Resident-state credit form (if applicable) | Schedule S (Form 540) — credit for taxes paid to another state, used when a California resident has income also taxed by another state | Form IT-112-R — New York resident credit for taxes paid to another state |
| Audit posture | FTB cross-references employer W-2 Box 16 California wage reporting against non-resident addresses; widely regarded as the most aggressive state on this issue | NYDTF audits large vesting events for former NY residents and high-income non-residents with NY employer ties, particularly in financial services |
The single most common misconception in this area is the belief that relocating to Texas, FloridaFlorida Tax: 6.00%, NevadaNevada Tax: 6.85%, or WashingtonWashington Tax: 6.50% before selling RSU shares makes the entire sale tax-free at the state level. It does not — and the reason is the two-bucket framework. The W-2 portion (Bucket 1) was earned during the grant-to-vest period, when you were working in California or New York. That income is sourced to those states based on where the work was performed — a fact that is permanently fixed at the moment of vesting and does not change based on your residence at the time of a later sale. Your move to Texas changes the sourcing of Bucket 2 (the capital gain) going forward — that gain is now Texas-sourced and Texas has no income tax, so Bucket 2 generates zero state tax. But Bucket 1 remains California-sourced (or New York-sourced) at whatever fraction the workday calculation produced, and that state's claim on Bucket 1 survives your move indefinitely. As FTB Publication 1100 makes clear, California's sourcing rules for income earned while a resident — or while working in California as a non-resident — do not evaporate simply because the recipient later moves away.
Reverse Formula — Splitting Sale Proceeds Into the Two Buckets
Every RSU sale after a multi-state grant-to-vest period requires this two-step calculation: first split the sale proceeds into the two buckets, then apply the correct sourcing rule to each bucket separately.
For shares sold within 12 months of vesting, Bucket 2 is short-term capital gain — taxed at ordinary federal rates. For shares held more than 12 months after vesting, Bucket 2 is long-term capital gain — taxed at preferential federal rates (0%, 15%, or 20%). The vest date — not the original grant date — is the start of the holding-period clock for this purpose.
Step-by-Step: Filing for a Post-Move RSU Sale
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Real-World Trailing Tax Scenarios — CA and NY
Scenario 1: California to Texas — Selling Two Years After the Move
Situation
An engineer worked 700 of 1,000 total workdays in California during a grant's grant-to-vest period (the remaining 300 workdays were in Texas after relocating). The grant vested in 2024 at $80 per share — 1,000 shares vested, total Bucket 1 value $80,000. The engineer held the shares and sold all 1,000 in 2026 at $110 per share, while living in Texas.
California allocation ratio: 700 ÷ 1,000 = 70%.
California-sourced Bucket 1 (2024 vest year): $80,000 × 70% = $56,000. This should have been reported on a California Form 540NR for the 2024 tax year as California-source wages. If it was not filed at the time, an amended or original 2024 540NR is now required.
Bucket 2 (2026 sale year): ($110 − $80) × 1,000 shares = $30,000 capital gain. Holding period: vested 2024, sold 2026 — more than 12 months — long-term capital gain.
Bucket 2 sourcing: The engineer is a Texas resident in 2026. Texas has no income tax. Bucket 2 generates $0 in state income tax — regardless of the $56,000 California allocation on Bucket 1.
Total state tax exposure: California tax on $56,000 (2024 vest year, via 540NR) — approximately $4,500–$5,500 depending on the engineer's total 2024 California-source income and applicable bracket. Texas tax on $30,000 capital gain (2026): $0.
Key lesson: The 2026 sale itself generates no new California filing obligation for Bucket 1 — that obligation was fixed in 2024, the vest year. The 2026 sale only generates Bucket 2 reporting, which is entirely Texas-sourced (zero tax). If the 2024 540NR was never filed, that is the open item — not anything related to the 2026 sale.
Scenario 2: New York Under the 14-Day Threshold — Zero Trailing Obligation
Situation
A consultant based in ConnecticutConnecticut Tax: 6.35% worked a total of 1,200 workdays during a grant's grant-to-vest period, of which 10 days were spent at a New York City client site. The grant vested in 2025 at $200 per share — 500 shares vested, Bucket 1 value $100,000. In 2026, the consultant (still in Connecticut) sells all 500 shares at $240 per share.
New York 14-day threshold check: 10 New York workdays during the grant-to-vest period. 10 < 14. The 14-day de minimis rule applies — New York-sourced Bucket 1 income = $0.
No Form IT-203 required for this grant's vest income — New York has no claim on any portion of the $100,000 Bucket 1.
Bucket 2 (2026 sale): ($240 − $200) × 500 = $20,000 long-term capital gain (held more than 12 months from the 2025 vest date). Sourced to Connecticut, the consultant's state of residence at sale — taxed under Connecticut's resident income tax rules.
Key lesson: The 14-day rule is a complete exemption, not a partial one. Ten New York workdays — even at a high-value engagement — produce zero New York tax on this grant's Bucket 1, because the threshold was not met. Had the consultant spent 4 more days in New York (totaling 14), the entire workday-fraction calculation would apply: 14 ÷ 1,200 = approximately 1.17% of $100,000 = approximately $1,167 in New York-sourced income, requiring a Form IT-203 filing for what would likely be a New York tax liability under $150.
Scenario 3: California to New York — Resident Credit in Action
Situation
A product manager worked 400 of 800 total workdays in California during a grant's grant-to-vest period before transferring to the New York office for the remaining 400 workdays. The grant vested in 2025 at $150 per share — 2,000 shares vested, Bucket 1 value $300,000. The product manager is a New York resident in 2025 (the vest year) and remains so in 2026 when they sell all shares at $170 per share.
California allocation ratio (Bucket 1): 400 ÷ 800 = 50%. California-sourced Bucket 1: $300,000 × 50% = $150,000. Filed on Form 540NR for the 2025 vest year — California non-resident tax on $150,000 at California rates (roughly $13,000–$15,000 depending on bracket stacking with other income).
New York allocation ratio (Bucket 1): 400 ÷ 800 = 50% — but as a New York resident in the vest year, New York taxes 100% of the product manager's worldwide income, including the full $300,000 Bucket 1 — not just the 50% New York-workday fraction. New York residents are taxed on worldwide income; the workday fraction only matters for non-residents.
Resident-state credit (Form IT-112-R): New York provides a credit for the California tax paid on the $150,000 that California also taxed (the overlapping portion). Credit = MIN(California tax on $150,000, New York tax on $150,000). If California tax on $150,000 ≈ $14,000 and New York tax on the same $150,000 ≈ $13,000, the credit is capped at $13,000 (the lower of the two) — New York tax due on that portion after credit ≈ $0, but the $1,000 difference (California's higher rate) is not refunded by New York.
Bucket 2 (2026 sale): ($170 − $150) × 2,000 = $40,000 capital gain, long-term. Sourced to New York (current residence) — taxed under New York resident rules on the full $40,000, no California allocation.
Key lesson: When you move to a state that itself has an income tax — especially one that taxes worldwide resident income like New York — Bucket 1 can be taxed by both your former work-state (California, via the workday fraction for non-residents) and your new resident state (on 100% of worldwide income as a resident). The resident-state credit mitigates but does not always fully eliminate this overlap, particularly when the former state's rate exceeds the new state's rate on that income.
Scenario 4: Short-Term vs Long-Term — Holding Period Starts at Vest, Not Grant
Situation
An employee's RSU grant was issued in 2020 with a 4-year vesting schedule. The final tranche vested on March 1, 2026 at $90 per share — 250 shares, Bucket 1 value $22,500. The employee sells those 250 shares on August 1, 2026 at $105 per share — five months after vesting.
Holding period determination: The grant itself is six years old (issued 2020). But for capital gains purposes, the holding period clock starts at the vest date — March 1, 2026 — not the 2020 grant date. From March 1, 2026 to August 1, 2026 is five months — less than the 12-month threshold for long-term treatment.
Bucket 2 characterization: ($105 − $90) × 250 = $3,750 short-term capital gain — taxed at ordinary federal income tax rates (the same brackets as wages, up to 37%), not the preferential long-term rates (0/15/20%).
State sourcing of Bucket 2: Sourced to the employee's state of residence on August 1, 2026 (the sale date) — entirely independent of the grant's six-year history or any prior multi-state work.
Key lesson: A grant being years old does not make a sale automatically long-term. Each vesting tranche has its own vest date, and the 12-month holding period clock restarts at each tranche's vest date. Selling immediately or within months of a vest — common with same-day-sale strategies — almost always produces short-term gain or loss on Bucket 2, taxed at ordinary rates federally, regardless of how long the underlying grant has existed.
California Publication 1100 — Nonresident Sourcing Beyond RSUs
FTB Publication 1100 governs the broader framework for how California sources income for nonresidents and individuals who change residency — not just RSUs. Understanding this framework clarifies why Bucket 1 and Bucket 2 are treated so differently.
| Income Type | California Treatment for Non-Residents | Key Form | Trailing Obligation? |
|---|---|---|---|
| RSU vest income (Bucket 1) | Workday-fraction allocation per FTB Pub. 1004 — sourced to where services were performed during the grant-to-vest period | Form 540NR | Yes — indefinite, tied to the vest event regardless of current residency |
| RSU sale capital gain (Bucket 2) | Sourced to residence at time of sale — California does not tax non-resident capital gains on intangible property like stock under the general Pub. 1100 framework | None (if non-resident at sale) — no California filing needed for this component | No — sourcing resets to current residence at each sale |
| NQSO exercise spread | Workday-fraction from grant date to exercise date per FTB Pub. 1004, Section B/C — same methodology as RSUs | Form 540NR | Yes — same indefinite trailing rule as RSUs |
| ISO disqualifying disposition | Workday-fraction on the ordinary income spread per FTB Pub. 1004, Section D — qualifying dispositions taxed as ordinary income in CA regardless (no LTCG preference) | Form 540NR | Yes for the ordinary income component |
| Rental/passive income from CA property | Always California-sourced regardless of residency — property location governs, not workdays | Form 540NR; passive loss carryforwards tracked separately per Pub. 1100 examples | Yes — for as long as the property generates income, regardless of owner's residence |
| Deferred compensation (non-equity) | Generally sourced to where earned (service period), similar workday-style analysis; some deferred comp plans have specific federal preemption rules (Section 401(a) source tax rules) | Form 540NR | Often yes, subject to federal source-tax limitations under 4 U.S.C. §114 |
| Interest, dividends, intangible capital gains (non-RSU) | Generally NOT California-sourced for non-residents — California follows the general rule that intangible income follows the owner's residence | None for non-residents | No |
Sources: CA FTB Publication 1004 (Equity-Based Compensation Guidelines), CA FTB Publication 1100 (Taxation of Nonresidents and Individuals Who Change Residency), FTB.ca.gov — May 2026.
Resident-State Credit — Schedule S (CA) vs IT-112-R (NY)
| Feature | California Schedule S | New York Form IT-112-R |
|---|---|---|
| Purpose | Credit for net income tax paid to another state on income also taxed by California as a resident | Resident credit for taxes paid to another state (or Canadian province) on income also taxed by New York as a resident |
| When it applies to RSU income | When you are a California resident and a portion of your Bucket 1 income is also sourced to and taxed by another state (e.g., New York) for the same vest event | When you are a New York resident (taxed on worldwide income) and a portion of your Bucket 1 income was also sourced to and taxed by another state (e.g., California) as a non-resident there |
| Credit cap | Lesser of: (a) tax actually paid to the other state on the double-taxed income, or (b) California tax attributable to that same income | Lesser of: (a) tax actually paid to the other state on the double-taxed income, or (b) New York tax attributable to that same income |
| Does it eliminate double taxation entirely? | Only if the other state's rate is equal to or higher than California's rate on that income — if California's rate is higher, residual CA tax remains after the credit | Only if the other state's rate is equal to or higher than New York's rate — if the other state's rate is lower, residual NY tax remains after the credit |
| Documentation required | Copy of the other state's return showing the income and tax paid; proof of payment | Copy of the other state's return (e.g., CA Form 540NR) showing the income and tax paid; proof of payment |
| Common RSU scenario | CA resident with a grant that has NY-workday-fraction sourcing (e.g., business travel to NY during the grant period) — NY taxes its fraction as non-resident income, CA credits that tax via Schedule S | NY resident with a grant that has CA-workday-fraction sourcing (e.g., prior CA employment during the grant period) — CA taxes its fraction as non-resident income via 540NR, NY credits that tax via IT-112-R |
What Triggers a Trailing Obligation vs What Does Not
Situations that DO create a trailing state tax obligation
- Any RSU grant where you performed at least one workday in California during the grant-to-vest period — the California fraction, however small, is California-sourced Bucket 1 income for the vest year, requiring Form 540NR
- Any RSU grant where you performed 14 or more workdays in New York during the grant-to-vest period — the New York fraction is New York-sourced Bucket 1 income, requiring Form IT-203
- NQSO exercises and ISO disqualifying dispositions where grant-to-exercise period included California or New York (14+ days) workdays — same workday-fraction mechanics as RSUs
- Rental income or gains from California real property — always California-sourced regardless of where you live, for as long as you own the property or until sale (and even at sale, CA may tax the gain on real property specifically, unlike intangible stock gains)
- A prior-year vest event for which the required non-resident return (540NR or IT-203) was never filed — the obligation does not disappear with time, though statute-of-limitations considerations apply for very old vest years
Situations that do NOT create (or do not extend) a trailing obligation
- Bucket 2 (capital gain) on RSU shares sold while you are a non-resident of California or New York — neither state taxes non-resident capital gains on intangible stock under the general sourcing framework, regardless of how the original Bucket 1 was sourced
- A grant issued entirely after you permanently left California or New York, with zero workdays in either state during that grant's entire grant-to-vest period — no allocation to either state for that grant
- An RSU grant where total New York workdays during the grant-to-vest period were fewer than 14 — the 14-day rule produces a complete exemption, not a small allocation
- Remote work performed for a California-based employer from outside California — physical location governs Bucket 1 sourcing, not the employer's location; zero California workdays means zero California allocation for that grant
- Interest, dividends, and gains on non-RSU intangible assets (brokerage accounts, mutual funds) held by a non-resident — these are not California- or New York-sourced under the general intangible-income rule, distinct from the RSU-specific Bucket 1 rule
Expert Tip — Ritu Sharma
"The question I ask every client who tells me they 'sold some old RSUs' after moving out of California is always the same: 'When did these vest, and did you file a 540NR for that year?' Almost nobody has thought about it that way. They're focused on this year's sale — the Schedule D entry, the capital gain — because that's the part that feels current. But the bigger number is almost always sitting in a prior year that nobody looked at. I had a client who moved to Austin in 2022, held onto a large vest from 2021 that was 60% California-sourced, sold the shares in 2025, and was completely focused on the 2025 capital gain — which, as a Texas resident, was zero state tax. Meanwhile the 2021 540NR had never been filed, and that 60% allocation on a six-figure vest was a real, six-figure-adjacent California liability sitting open with penalties and interest accruing. We filed the 2021 return that year — separately from, and more importantly than, the 2025 sale return. The sale is the easy part. The vest-year filing is the part that doesn't go away on its own."
Who Needs to Understand the Two-Bucket Framework?
- Anyone who held RSU shares after vesting and later sold them post-relocation — the most common error is treating the entire sale as a single event sourced to the current state of residence. If any portion of the underlying grant's grant-to-vest period included California or New York (14+ day) workdays, Bucket 1 has a fixed sourcing obligation to that state for the vest year — separate from and unaffected by the current-year sale. Anyone in this position should first determine whether the vest-year non-resident return was filed correctly before focusing on the sale-year capital gains reporting.
- Employees who relocated mid-grant and plan to hold shares rather than sell immediately — holding RSU shares after vesting converts what would otherwise be a single, simple W-2 income event into a two-event, two-bucket, potentially two-state filing situation. The financial-planning convention of selling RSUs immediately at vest (same-day sale) avoids the entire Bucket 2 complexity — there is no appreciation to source separately because the sale happens at the same value as the vest. Employees who choose to hold shares for tax-timing, diversification-delay, or other reasons should understand that they are creating a future Bucket 2 event whose state sourcing will depend on wherever they live when they eventually sell — which may be a different state than where Bucket 1 was sourced.
- Workers with grants that span a job change and a relocation simultaneously — when an employee changes employers and relocates in the same period, RSU grants from the prior employer may have grant-to-vest periods that straddle both the old location and the new one, with vesting continuing for years after the job change under the prior employer's accelerated vesting terms (common in acquisitions) or under a new employer's assumed/converted grants. Each grant's workday fraction must be calculated based on where the recipient actually worked during that specific grant's period — which may not align neatly with employment dates if there was a gap, a leave of absence, or overlapping employment during a transition.
- New York residents with prior California-sourced equity from a previous job — a worker who spent several years in California, accumulated unvested RSU grants, then relocated to New York for a new role faces an unusual situation: as a New York resident, New York taxes 100% of their worldwide income including any California-sourced Bucket 1 from grants that continue vesting from the prior California employer (if any continued vesting was negotiated) — while California separately taxes its workday fraction as non-resident income. This is the scenario where Form IT-112-R's resident credit becomes directly relevant, and where the interaction between two high-tax states' rules produces the most complex filing requirements covered in this guide.
- Anyone considering an amended return for a previously unfiled 540NR or IT-203 — if you vested RSUs with California or New York sourcing in a prior year and never filed the corresponding non-resident return, the obligation does not disappear — it remains open subject to each state's statute of limitations (generally longer for unfiled returns than for amended returns, since the limitations period for assessment often does not begin running until a return is filed). Anyone who discovers this gap — often when reviewing records for a current-year sale — should evaluate whether to file the original prior-year non-resident return now, potentially with penalties and interest, versus the risk of the state identifying the gap independently through W-2 Box 16 data matching.
- Tax preparers handling clients with multi-state equity compensation history — preparers who default to sourcing 100% of an RSU sale to the client's current state of residence will systematically miss Bucket 1 trailing obligations for clients with California or New York work history during any grant's vesting period. The two-bucket framework should be a standard intake question for any client reporting RSU sale proceeds: "Did you work in California or New York at any point between the grant date and the vest date of these shares?" — a single question that determines whether a 540NR or IT-203 review is needed for the vest year, independent of the current-year sale return.
Before preparing the tax return for the year you sell RSU shares, take a separate pass through your records to confirm that every prior vest year with potential California or New York sourcing already has the corresponding non-resident return on file. This is a distinct task from the current-year sale return — the sale return only needs to correctly characterize and source Bucket 2 (the capital gain), which is usually straightforward if you know your current state of residence. The harder, often-overlooked task is verifying Bucket 1's historical compliance. Pull your W-2s for every year in which RSUs from the relevant grants vested. Check Box 16 (state wages) for California (CA) or New York (NY) entries. If Box 16 shows a California or New York allocation and you do not have a corresponding 540NR or IT-203 on file for that year, that is the priority item — independent of, and prior to, the current sale-year filing. Addressing a multi-year-old unfiled non-resident return proactively, before a state's automated data-matching program identifies it, generally produces a better outcome in terms of penalties and the overall resolution process.
Common Mistakes in Post-Move RSU Sale Reporting
Treating the sale-year return as the only relevant filing: The sale generates Bucket 2 reporting in the sale year. It does not retroactively create or resolve the Bucket 1 obligation, which belongs to the vest year. Filers who only consider "what do I report for this year's sale" without separately checking the vest year's compliance miss the larger and often more consequential issue.
Assuming the capital gain's holding period runs from the original grant date: The holding period for federal short-term vs long-term capital gains characterization on Bucket 2 begins at the vest date, not the grant date — regardless of how many years elapsed between grant and vest. A grant that took six years to fully vest under a complex schedule still produces a Bucket 2 with a holding period clock that starts fresh at each tranche's individual vest date.
Applying the workday fraction to Bucket 2: The workday fraction is a Bucket 1 concept — it allocates the compensation-for-services income among the states where that service was performed. Bucket 2 (capital gain on intangible property) follows an entirely different sourcing principle: residence at time of sale. Applying the grant-period workday fraction to the capital gain produces an incorrect — and overstated — allocation to the former work state.
Believing New York's 14-day rule applies separately to each year rather than to the whole grant-to-vest period: The 14-day threshold is measured across the entire grant-to-vest period for a given grant — not per calendar year. A grant with a 3-year vesting period and 5 New York workdays in year one, 5 in year two, and 5 in year three totals 15 New York workdays across the period — meeting the 14-day threshold even though no single year exceeded it. The cumulative count across the full period is what matters.
Not accounting for the resident-state credit cap when the former state's rate is higher: When a current resident state's credit (Schedule S, IT-112-R) is capped at the lower of the two states' tax on the overlapping income, filers sometimes assume the credit fully eliminates the former state's tax. If California's rate on the overlapping income exceeds the current resident state's rate on that same income, the credit only offsets up to the current state's tax — the excess California tax remains a real cost with no further offset.
Expert Insight and Market Impact
The trailing-tax issue has become significantly more visible as technology employee migration from California to no-tax states accelerated over the past several years, while RSU grant values at major technology companies grew substantially. The combination means more individuals than ever are in a position where a multi-year-old grant, sourced partly to California or New York during years they worked there, vests or is sold years after their departure — at a time when their current state of residence has no income tax and therefore no natural prompt to "think about state taxes" at all.
California's FTB has correspondingly increased its data-matching sophistication. Employer-reported W-2 Box 16 California wage data for non-resident addresses is a direct signal the FTB uses to identify potential non-filers — and equity compensation events, because they are often large dollar amounts concentrated in a single vest date, are disproportionately likely to trigger this kind of review compared to smaller, more routine wage income.
The two-bucket framework itself is not new — it reflects long-standing principles distinguishing compensation income (sourced to where services were performed) from capital gains on intangible property (sourced to the owner's residence). What has changed is the scale: RSU grant values that were once modest are now, at many technology and finance employers, large enough that even a 10-20% workday-fraction allocation to a high-tax state represents a meaningful five- or six-figure tax liability — making the historically niche question of "did I file the right non-resident return for my vest year" a materially consequential one for a much larger population of taxpayers.
Final Verdict
RSU sale income after a multi-state move is never a single number for tax purposes — it is two buckets governed by two different rules. Bucket 1 (the W-2 portion, equal to vest-date value) is sourced by the workday fraction to wherever you worked during the grant-to-vest period, and that sourcing is permanent — California's and New York's claims on their respective fractions do not expire when you move, though New York's claim is entirely extinguished if total New York workdays for that grant were under 14. Bucket 2 (the capital gain, equal to sale price minus vest-date value) is sourced to wherever you live when you sell — independent of the grant's work history.
Before filing a return for the year of an RSU sale, separately verify that the vest year's non-resident filing obligations (Form 540NR for California, Form IT-203 for New York) were satisfied for every grant involved — this is the higher-stakes and more commonly overlooked piece. The sale-year return itself is usually the simpler of the two: characterize Bucket 2 by its holding period from the vest date, and source it to your current state of residence. If your current resident state also taxes worldwide income and a portion of Bucket 1 was independently taxed by a former work state, the resident-state credit (Schedule S or IT-112-R) addresses the overlap — but only up to the lower of the two states' rates on that specific income.