ISO Stock Option Exercise Planner β Multi-Year AMT Calculator
Calculate AMT exposure for ISO exercise across a 4-year window. Find max shares exercisable before AMT, optimal exercise schedule, and exercise-and-hold vs sell comparison.
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$
Current 409A valuation or market price %
Annual FMV growth assumption for future years $
W-2 + other income (affects AMT budget) $
Depreciation adjustments, private activity bond income, etc. For 4-year vesting schedule planning
Examples:
Max Shares Before AMT
$0
Bargain Element per Share
$0
AMT Budget (Year 1)
$0
AMT if All Vested Exercised
4-Year Optimal Exercise Schedule
| Year | FMV | Bargain/Share | AMT Budget | Safe Shares | AMT Exposure |
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ISO Exercise Strategy Guide
Incentive Stock Options offer significant tax advantages β exercising and holding can convert ordinary income treatment into long-term capital gains. The challenge is managing AMT exposure in the exercise year. Strategic multi-year planning can minimize or eliminate AMT while maximizing LTCG treatment.
AMT Calculation Formula
AMT Income = Regular Income + ISO Bargain Element + Other Preferences
AMT Exemption = $88,100 (single) / $137,000 (MFJ) for 2026
Phase-out: Exemption reduced by 25% of AMTI above $634,000 / $1,267,800
AMTI = AMT Income β AMT Exemption
Tentative AMT = AMTI Γ 26% (up to $232,600) + AMTI excess Γ 28%
AMT Owed = Max(0, Tentative AMT β Regular Tax)
Max "Safe" Bargain Element = AMT Exemption Available β Other AMT Items
AMT Exemption = $88,100 (single) / $137,000 (MFJ) for 2026
Phase-out: Exemption reduced by 25% of AMTI above $634,000 / $1,267,800
AMTI = AMT Income β AMT Exemption
Tentative AMT = AMTI Γ 26% (up to $232,600) + AMTI excess Γ 28%
AMT Owed = Max(0, Tentative AMT β Regular Tax)
Max "Safe" Bargain Element = AMT Exemption Available β Other AMT Items
Extended
Exercise-and-Hold vs Exercise-and-Sell + AMT Credit Recovery
Compare tax outcomes for hold vs sell strategies and see how AMT credit is recovered over time
Compare exercise-and-hold (hold for LTCG) vs exercise-and-sell (disqualifying disposition) strategies, and see the AMT credit recovery timeline for the hold strategy.
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Projected FMV at time of eventual sale (hold scenario) | Item | Exercise & Hold (LTCG) | Exercise & Sell (Ordinary) |
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AMT Credit Recovery (Hold Scenario)
| Year | Regular Tax | Tentative Min Tax | AMT Credit Used | Remaining Credit |
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Frequently Asked Questions
How does AMT work with ISO stock option exercises?
When you exercise Incentive Stock Options (ISOs) and hold the shares (rather than selling immediately), the "bargain element" (Fair Market Value minus Exercise Price) is an AMT preference item β it is added to your AMTI (Alternative Minimum Tax Income). You owe AMT if AMTI-based tax exceeds regular tax. For 2026, the AMT exemption is $88,100 single / $137,000 MFJ, phasing out at $634,000/$1,267,800. The AMT rate is 26% up to $232,600 AMTI, and 28% above. AMT paid generates a credit (AMT credit) that can be reclaimed in future years when regular tax exceeds AMT.
What is the maximum number of ISO shares I can exercise without triggering AMT?
The "safe" exercise amount is the number of shares where (shares Γ bargain element) β€ (available AMT exemption - other AMT items). If your AMT exemption is $88,100 and you have no other AMT items, and your bargain element per share is $40 ($50 FMV - $10 exercise price), you can exercise $88,100 Γ· $40 = 2,202 shares without triggering AMT. Exercising more means the excess portion is subject to AMT at 26-28%. Note: the AMT exemption phases out at higher incomes, so the "safe" amount decreases for high earners.
What is the difference between exercising-and-holding vs exercising-and-selling ISOs?
Exercise-and-hold: No regular income tax at exercise; the spread is an AMT preference item (may trigger AMT); if you hold β₯2 years from grant date AND β₯1 year from exercise date, the gain qualifies for long-term capital gains rates when you eventually sell. Exercise-and-sell (same day, "disqualifying disposition"): The entire spread is ordinary income β treated like W-2 wages, subject to FICA and income tax at your marginal rate (up to 37%). No AMT exposure but much higher immediate tax. A partial sell to cover AMT can be optimal in many cases.
What is an ISO qualifying disposition and how is it taxed?
A qualifying disposition occurs when you sell ISO shares AFTER meeting both holding period requirements: (1) more than 2 years after the grant date, and (2) more than 1 year after the exercise date. In a qualifying disposition, the entire gain from exercise price to sale price is taxed at long-term capital gains rates (0%, 15%, or 20%). This is the most tax-efficient outcome for ISOs. Any AMT paid at exercise creates an AMT credit that offsets regular tax in the sale year or future years, effectively recovering the AMT cost.
How should I plan ISO exercises across multiple years?
Optimal multi-year ISO planning involves: (1) Calculate each year's available "AMT budget" β how much bargain element can be recognized before AMT kicks in; (2) Spread exercises across years to stay below AMT each year rather than exercising all at once; (3) Consider the FMV trajectory β if the stock is growing, exercise earlier to lock in lower spread (lower AMT preference amount) while shares may be worth more at sale; (4) Coordinate with other AMT preference items (depreciation adjustments, private activity bonds); (5) In years with low income (sabbatical, early retirement), the AMT budget is typically larger. Model at least 4 years to optimize.