Arizona Taxes on RSUs and Stock Options: A Tech Employee's Guide

Arizona has quietly become one of the most competitive states for tech employees from a tax standpoint. Intel is expanding its fabrication campus in Chandler with a $20B+ investment. TSMC is building a $40B advanced chip fab in north Phoenix. GoDaddy and Carvana are headquartered in the Phoenix metro. Axon Enterprise (maker of Taser and police body cameras) is in Scottsdale. Microchip Technology is in Chandler. And thousands of tech workers have relocated from California, drawn by lower housing costs and a dramatically lower tax burden.

The headline numbers: Arizona taxes all income — including RSU vests and salaries — at a flat 2.5%, the lowest flat income tax rate in the United States.¹ And starting in 2026, a new law (SB 1331) expands Arizona's 25% long-term capital gains subtraction to cover all assets — making the effective Arizona rate on long-term capital gains just ~1.875%.²

Arizona also has no state alternative minimum tax — a meaningful advantage for startup employees exercising incentive stock options, since California imposes a 7% state AMT and Colorado imposes a 3.47% state AMT on the same ISO exercise events.

This guide covers how Arizona taxes each type of equity compensation, the 2026 LTCG subtraction expansion, the California long-arm sourcing rules that follow you after a move, and how to plan around Arizona's rules.

Arizona's tax structure for tech employees at a glance

RSUs in Arizona

At vest: ordinary income taxed at 2.5%

When RSUs vest, the fair market value on the vesting date is ordinary income — taxed federally at your marginal rate (22–37%) and by Arizona at 2.5%. Your employer withholds at the IRS 22% supplemental rate for federal and should withhold Arizona's 2.5% for state. For senior engineers with marginal federal rates of 32–37%, the 22% federal withholding creates a shortfall you'll owe at tax time. Arizona's withholding at vest is generally accurate given the 2.5% flat rate. See the RSU after-tax calculator and RSU tax planning guide for modeling the full after-tax proceeds.

Example: a GoDaddy engineer in Tempe vests $200,000 of RSUs in 2026. Federal tax at 35% marginal rate = $70,000. Arizona state tax at 2.5% = $5,000. Total state + federal = $75,000. The shares' post-tax value before any subsequent appreciation is approximately $125,000. Compare: the same vest in California would incur $26,600 in state income tax (13.3%) on top of the federal — an $21,600 difference on a single vest event.

After vest: LTCG at ~1.875% if held 12+ months

Your cost basis in the shares is the FMV at vest. If you sell within 12 months, the gain is a short-term capital gain taxed at the standard 2.5%. If you hold for more than 12 months, the gain qualifies as a long-term capital gain and Arizona's 25% subtraction reduces the effective rate to approximately 1.875%.

This is importantly different from Colorado (4.4%, no LTCG preference), Oregon (9.9%, no LTCG preference), Massachusetts (5% but 8.5% on short-term gains), and New Jersey (8.97–10.75%, no LTCG preference). Arizona gives you a real state-level incentive to hold RSU shares for 12+ months after vesting — in addition to the federal LTCG preference. For tech employees with concentrated positions in large-cap employer stock that they believe in long-term, the combined federal + Arizona LTCG savings can be substantial.

ISOs and Arizona's AMT advantage

For startup employees holding incentive stock options, Arizona's most important equity tax feature is what it doesn't have: a state alternative minimum tax.

No state AMT at exercise

When you exercise ISOs and hold the shares (rather than immediately selling), the bargain element — the difference between the FMV at exercise and your strike price — is not regular income at the federal level, but it is an AMT preference item. California imposes a 7% state AMT on this spread. Colorado imposes a 3.47% state AMT. Arizona imposes zero.

Concretely: an Axon or Intel startup grant employee exercises ISOs with a $500,000 bargain element (FMV − strike) in 2026. Federal AMT on that spread is approximately $130,000 (26% on the first ~$239K of AMTI above the $90,100 exemption, 28% above that). In California, this same exercise would add another $35,000 in state AMT. In Colorado, it would add ~$17,350. In Arizona: $0 additional state AMT. Arizona effectively removes the state AMT friction from ISO exercise planning.

Qualifying vs. disqualifying dispositions in Arizona

• Qualifying disposition (hold ≥2 years from grant AND ≥1 year from exercise): no ordinary income at exercise for Arizona purposes (Arizona conforms to federal ISO treatment). At sale, the entire gain — spread plus post-exercise appreciation — is a long-term capital gain. Arizona taxes it at ~1.875% effective (25% subtraction applies). No state AMT event.
• Disqualifying disposition (sell before holding periods are met): the spread (FMV at exercise − strike) becomes ordinary income taxed at 2.5% in Arizona. Additional appreciation is either short-term (2.5%) or long-term (~1.875%) depending on whether you held 12+ months from exercise. No state AMT, even on a disqualifying disposition.

The practical implication: in Arizona, ISO planning is primarily a federal AMT optimization problem. You can exercise ISOs in larger tranches than you could in California without worrying about an overlaid state AMT. The ISO AMT calculator models the federal AMT precisely — Arizona employees can use it without adding a state AMT overlay.

NSOs in Arizona

Non-qualified stock options are taxed at exercise: the spread (FMV at exercise minus strike price) is ordinary income, reported on your W-2 and taxed by Arizona at 2.5%. There is no state AMT event for NSOs. Post-exercise appreciation held for 12+ months is a long-term capital gain subject to Arizona's 25% subtraction — effective rate ~1.875%. Post-exercise appreciation sold within 12 months is a short-term gain at 2.5%.

ESPP in Arizona

Employee Stock Purchase Plans (§423 qualifying plans) are taxed in Arizona according to the same income classification as federal treatment, at 2.5%:

• Disqualifying disposition: the ordinary income component (the discount, including any look-back benefit) is taxed at 2.5% in Arizona; any additional short-term gain is also 2.5%.
• Qualifying disposition: the 15% discount (or enhanced look-back discount) is ordinary income at 2.5%; appreciation above that held for 12+ months is a long-term capital gain at ~1.875% effective.

See the ESPP guide and ESPP calculator for after-tax modeling across both disposition types. For Arizona employees, qualifying dispositions carry a meaningful state tax advantage over disqualifying ones — the same direction as federal, just smaller in magnitude.

Moving from California to Arizona: what changes for equity

California-to-Arizona is one of the most common tech worker relocation routes. The tax savings are real and meaningful, but California's long-arm sourcing rules follow equity compensation across state lines.

California long-arm sourcing still applies to old grants

California taxes RSU income based on the proportion of the grant-to-vest period you spent working in California — regardless of where you live when the shares actually vest. If you received an RSU grant while working at a California office, moved to Arizona partway through the vesting schedule, and the shares vest after you've left California, California still claims the California-workday fraction of that vest as California-source income.³

Example: you received a 4-year RSU grant on January 1, 2024 while working at Google's Mountain View campus. You relocated to Arizona on January 1, 2026 (exactly halfway through the grant). RSUs that vest in 2027 or 2028 will still be 50% California-source income — California can tax that portion at up to 13.3%, even though you're a full-time Arizona resident at vest. Arizona will also tax the income based on your Arizona workdays during the grant-to-vest period, with a credit for taxes paid to California that partially offsets the double-exposure.

This effect fades over time: every new RSU grant made after you establish Arizona residency has 0% California-source income (assuming you've completed your move and stopped working in California). But the tail on pre-move grants can extend 3–4 years after relocation depending on your vesting schedule. The California equity tax guide and remote work state tax guide cover the sourcing mechanics in detail.

Income tax savings after the move

For a senior engineer with $400–600K in total comp (base + RSUs + bonus), the total state tax savings from a California-to-Arizona move often range from $40,000 to $80,000+ per year. Unlike Texas, Washington, Florida, or Nevada (which have $0 state income tax), Arizona still has a small income tax — but at 2.5%, it's roughly 1/5th of California's top rate.

Establishing Arizona domicile

To stop California's income tax from applying to your future income, you need to change your legal domicile — not just your mailing address. California is aggressive about challenging part-year residency claims. The standard domicile-change checklist: register to vote in Arizona, update your driver's license to Arizona, change your primary financial accounts to Arizona addresses, update employer payroll records, and document your physical presence (the 546-day rule: spend fewer than 546 days in California in any rolling 24-month period). Minimize time spent working in California after the move.

Planning strategies for Arizona tech employees

1. Hold RSU shares for LTCG benefit at both federal and state level

Arizona is one of the few states that actually rewards holding RSU shares for 12+ months. At the federal level, you shift from 37% ordinary income rates to 20% long-term capital gains — a 17-percentage-point saving on the appreciation above your vest-date cost basis. At the Arizona level, you shift from 2.5% to ~1.875% — a smaller saving but real. Combined federal + Arizona incentive to hold: up to 17.625% improvement in tax rate on appreciated shares. Use concentration risk and diversification needs as the primary guide for the sell/hold decision, but Arizona's LTCG preference eliminates the "state doesn't care anyway" logic you'd hear in Colorado or Oregon.

2. Exercise ISOs more aggressively than you could in California

Without a state AMT, the tradeoff in Arizona is purely federal AMT vs. the benefit of starting the qualifying disposition clock. Federal AMT exemptions in 2026 are $90,100 (single) / $140,200 (MFJ), with phaseouts at $500K / $1M. You can use the ISO AMT calculator to find your maximum no-AMT exercise amount each year. In Arizona, the answer feeds directly into your exercise decision — there's no California-AMT overlay to subtract. For startup employees at Intel, TSMC, or Phoenix-area companies with significant ISO grants, this gives more flexibility to exercise early and begin qualifying holding periods.

3. Time large RSU sales to capture qualifying LTCG treatment

For RSUs with substantial appreciation above the vest-date cost basis — common for employees at Intel, Microchip, Axon, or other established tech employers — waiting until 12 months after vest to sell saves both the federal rate differential and Arizona's incremental 0.625% (from 2.5% to 1.875%). On a $500K capital gain, Arizona's LTCG preference saves $3,125 in state tax alone — real money, even if small relative to the federal savings. Don't hold purely for Arizona state tax savings if it creates excessive concentration risk, but factor it into the timing decision.

4. DAF strategy for concentrated appreciated employer stock

If you have appreciated employer stock (held 12+ months from vest) and charitable intent, donating directly to a donor-advised fund eliminates the federal capital gain tax event entirely — and since Arizona also doesn't realize the gain on a DAF donation, it also avoids the Arizona state tax. You get a federal charitable deduction for the full fair market value of the shares. Arizona allows a charitable deduction conforming to the federal deduction (subject to the standard 60% AGI limit for cash, 30% for appreciated stock). This strategy is covered in the DAF guide.

5. Max retirement accounts to push ordinary income below vest-year peaks

Arizona taxes ordinary income (including RSU vests) at 2.5%, so every dollar deferred into a traditional 401(k) saves Arizona tax at 2.5% — meaningful primarily for its federal impact (22–37%), but the Arizona contribution is additive. Mega Backdoor Roth contributions (after-tax 401k → in-plan Roth conversion) build Roth assets exempt from Arizona income tax on withdrawal. See the Mega Backdoor Roth calculator to model your exact MBR space for 2026 (maximum $70,000 total 415(c) limit minus pre-tax + employer match). Note: the 2026 415(c) limit is $70,000; the employee elective deferral limit is $24,500 with $8,000 catch-up at 50+, or $11,250 super catch-up at ages 60–63.

6. Get the CA long-arm calculation done before your first Arizona vest

If you relocated from California within the last 4 years and still have unvested equity from grants made while you were a California employee, the grant-to-vest sourcing calculation affects your California non-resident return every year until those grants fully vest. Don't guess at the percentage — get it calculated specifically for each grant's grant date, vest date, and the exact California workday count during the grant-to-vest period. This number often differs from a naive "months I lived in California" estimate and can meaningfully change what you owe California vs. what you can claim as Arizona credit.

What a fee-only advisor can help you model

• The exact CA long-arm fraction for each unvested grant, so you know what you'll owe California and what to claim as a credit on your Arizona return
• ISO exercise amount each year to maximize qualifying disposition clock starts while managing federal AMT exposure (Arizona state AMT is not a constraint)
• RSU lot selection for the 12-month hold decision: concentration risk, federal LTCG savings, and Arizona LTCG subtraction all factor into the optimal sell schedule
• DAF and charitable giving strategy for tech employees with concentrated appreciated employer stock and charitable intent
• Year-by-year retirement account stacking (401k + Mega Backdoor Roth + HSA) to optimize Arizona and federal taxable income around RSU vest years