Equity
ISO Tax Planning: How It Saves You $10,000-$100,000 in 2026
Incentive Stock Options (ISOs) receive preferential tax treatment: no ordinary income tax at exercise (unlike NSOs). However, the spread at exercise is an AMT preference item, which can trigger Alternative Minimum Tax. Strategic planning around exercise timing, AMT crossover points, and qualifying dispositions can save tens of thousands. The key: exercise enough to use your AMT exemption but not so much that you trigger a massive AMT bill.
Who Qualifies
- Hold ISOs from current or previous employer
- Pre-IPO employees with significant ISO grants
- Post-IPO employees deciding when to exercise
Who does NOT qualify
- Only hold RSUs (no ISO component)
- Already exercised and sold all options
How the Math Works
Spread: $18/share × 50,000 = $900K AMT preference. Exercising all at once triggers ~$250K in AMT. Instead, exercise 10,000/year over 5 years.
Phased exercise keeps AMT under $50K/year (within AMT credit recovery range). Total tax savings vs. one-time exercise: $80K-$120K.
Legal Basis & IRC Citations
- IRC §422: Incentive stock options
- IRC §421: General rules for statutory stock options
- IRC §55: Alternative Minimum Tax
- IRC §56(b)(3): ISO spread as AMT preference item
What to Tell Your CPA
“I have [X] ISOs with a strike price of $[X] and current FMV of $[X]. I'd like to model the AMT impact of exercising different quantities this year. Can you calculate my AMT crossover point and recommend an optimal exercise quantity?”
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Frequently Asked Questions
Do I owe tax when I exercise ISOs?
Not regular income tax, but the spread (FMV minus strike price) is an AMT preference item. If the spread pushes your AMT calculation above your regular tax, you'll owe AMT. However, AMT paid on ISO exercises generates an AMT credit that can be recovered in future years.
What is a qualifying disposition?
Hold the shares for 2+ years from grant date AND 1+ year from exercise date. If you meet both, the entire gain is taxed at long-term capital gains rates (20%) instead of ordinary income rates (37%). This can save 17 percentage points.
Should I exercise ISOs before an IPO?
Often yes, if the FMV is still low (reducing the AMT spread). The 83(b) election timing doesn't apply to ISOs, but early exercise at low FMV starts the qualifying disposition clock. Consult your CPA on the AMT impact.
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