Incentive Stock Options (ISOs) offer significant tax benefits, but relocating from New York to Texas creates complex timing considerations. When you exercise ISOs relative to your move can dramatically impact your state tax liability and Alternative Minimum Tax (AMT) exposure.
How ISOs Are Taxed
ISOs receive favorable tax treatment:
At Grant: No tax
At Exercise:
- No regular income tax
- But the “bargain element” (FMR – exercise price) is an AMT preference item
- May trigger Alternative Minimum Tax
At Sale:
- If you hold for 1 year after exercise AND 2 years after grant (qualifying disposition): Long-term capital gain
- If you sell earlier (disqualifying disposition): Ordinary income on the spread at exercise, capital gain/loss on additional appreciation
State Tax Allocation
Unlike RSUs, which are allocated based on workdays between grant and vest, ISO income is allocated based on:
- At exercise: Where you were a resident when you exercised (for AMT purposes)
- At sale: Where you were a resident when you sold (for regular tax)
The AMT Problem
When you exercise ISOs, the bargain element is added to your AMT income. If this triggers AMT:
- You pay AMT in the year of exercise
- You receive an AMT credit that can offset future regular tax
- The state where you’re a resident at exercise gets to tax the AMT income
Timing Strategy 1: Exercise After Moving to Texas
If you exercise ISOs after establishing Texas residency:
- No state AMT (Texas has no income tax)
- No state tax on eventual sale (if you’re still a Texas resident)
- You save NY’s top rate (10.9%) on the entire bargain element
Example:
- 10,000 ISOs with $10 exercise price
- FMV at exercise: $60
- Bargain element: $50 × 10,000 = $500,000
- NY tax savings: $500,000 × 10.9% = $54,500
Timing Strategy 2: Exercise Before Moving (If AMT Isn’t Triggered)
If exercising won’t trigger AMT (because the bargain element is small or you have AMT credits), exercising before you move may be fine. You’ll pay no state tax on exercise, and if you sell after moving to Texas, you’ll pay no state tax on the sale either.
Timing Strategy 3: Split Exercise Across Move Date
If you have a large ISO position, consider:
- Exercise some ISOs before moving (if AMT isn’t an issue)
- Exercise remaining ISOs after establishing Texas residency
- This spreads the AMT impact across multiple years
The Disqualifying Disposition Trap
If you exercise ISOs while a NY resident and then sell before meeting the holding period requirements (disqualifying disposition):
- The spread at exercise becomes ordinary income
- New York will tax this income even if you’re a Texas resident at sale
- You lose the benefit of moving to a no-tax state
Example:
- Exercise ISOs in 2024 while NY resident
- Move to Texas in 2025
- Sell ISOs in 2025 (disqualifying disposition)
- Spread at exercise: $500,000
- NY taxes the full $500,000 as ordinary income
- You saved nothing by moving
Allocation for Multi-State Workers
If you worked in multiple states between grant and exercise, some states (including California) may try to allocate ISO income based on workdays, similar to RSUs. New York generally doesn’t use this method for ISOs, but the law is unclear.
AMT Credit Planning
If you pay AMT when exercising ISOs:
- You receive an AMT credit
- The credit can offset future regular tax
- But you can only use the credit in years when you’re not subject to AMT
If you move to Texas after exercising ISOs in New York:
- You paid NY AMT
- Your future regular tax will be lower (because you’re in Texas)
- You may not be able to fully utilize your AMT credit
Cashless Exercise Considerations
Many employees use cashless exercise (exercise and immediately sell). For state tax purposes:
- The spread at exercise is ordinary income
- Allocated to your state of residence at exercise
- Moving to Texas before cashless exercise saves significant state tax
Example:
- Cashless exercise of 10,000 ISOs
- Spread: $50 per share = $500,000 ordinary income
- If done as NY resident: $54,500 NY tax
- If done as TX resident: $0 state tax
- Savings: $54,500
83(b) Elections and ISOs
If you have early-exercisable ISOs and you make an 83(b) election:
- You pay tax at exercise (even though shares aren’t vested)
- Future appreciation is capital gain
- State tax is owed in your state of residence at exercise
Moving to Texas before making an 83(b) election can save significant state tax.
Coordinating with Your Employer
Before relocating, discuss with your employer:
- Vesting schedules and exercise windows
- Whether acceleration is possible
- Payroll tax withholding for multiple states
- Equity plan rules about residency changes
Our ISO Planning Process
We help clients optimize ISO exercise timing by:
- Calculating AMT impact of exercise before vs. after move
- Modeling state tax savings under different scenarios
- Advising on optimal exercise timing
- Coordinating with your employer’s equity team
- Preparing multi-state tax returns
- Defending allocation in audits
If you have significant unvested ISOs and you’re planning to relocate, contact us to model your options. The tax savings from proper timing can be substantial.
