Tesla Senior Engineer: Exercising a Near-Zero-Strike Option Grant
A Tesla senior engineer holds 12,000 options at a near-zero effective strike after a prior 3-for-1 split. Here is how we timed the exercise around AMT.
A senior software engineer at Tesla joined in 2018 and received a grant of 5,000 ISOs at a strike price of $68 per share. Tesla conducted a 5-for-1 split in 2020 and a 3-for-1 split in 2022. After both splits, his position adjusted to 75,000 options at an effective strike of $4.53 per share. By 2024 he had exercised 63,000 shares over several years. His remaining 12,000 unexercised ISOs at $4.53 strike were sitting with an intrinsic spread of nearly $200 per share at Tesla’s 2025 price of $205. The question: how and when to exercise the remaining 12,000 before the 10-year expiration in 2028?
Situation
His option position:
- 12,000 remaining ISOs, strike $4.53, expiration March 2028.
- Current FMV: $205.
- Spread per share: $200.47.
- Total AMT preference if all exercised today: 12,000 × $200.47 = $2,405,640.
His tax picture:
- Single filer, California resident.
- W-2 income: $285k base + $65k bonus + $195k RSU vest = $545k.
- Pre-exercise regular federal tax: approximately $142,000.
- Pre-exercise tentative AMT: approximately $98,000 (below regular, no AMT).
- AMT exemption single 2025: $88,100, phasing out at $626,350.
At $545k of regular income, his AMT exemption was partially phased out (approximately $66,000 of exemption remaining). Any ISO exercise would generate AMT preference that is not offset by remaining exemption. The effective AMT marginal rate on incremental preference:
- 28% up to phaseout region.
- At higher income, 32.5% due to the 25%-per-dollar phaseout on remaining exemption.
If he exercised all 12,000 in one year, AMT preference of $2.4M would drive his AMT far above regular tax. The additional AMT owed:
| Exercise size | AMT income added | Additional AMT owed | Cash cost (strike + AMT) |
|---|---|---|---|
| 0 | $0 | $0 | $0 |
| 2,000 shares | $400,940 | $116,300 | $9,060 strike + $116k AMT = $125,360 |
| 4,000 shares | $801,880 | $240,600 | $18,120 strike + $241k AMT = $258,720 |
| 8,000 shares | $1,603,760 | $481,100 | $36,240 strike + $481k AMT = $517,340 |
| 12,000 shares | $2,405,640 | $721,700 | $54,360 strike + $722k AMT = $776,060 |
At 12,000 shares in one year, his AMT cash cost would be $722k. AMT credits would carry forward indefinitely and recover against future regular tax, but recovery typically takes 5-15 years, meaning substantial opportunity cost on the AMT-paid cash.
Alternative: spread the exercise across 3 years (2025, 2026, 2027). Each year’s exercise of 4,000 shares stays within a more manageable AMT band. Total AMT cost across 3 years: approximately $720k, roughly the same as a single-year exercise. But the cash-flow profile is smoother.
What we modeled
Three strategies:
| Strategy | Cash timing | AMT credit recovery |
|---|---|---|
| Exercise all 12,000 in 2025 | $776k out-of-pocket in 2025 | Credit of ~$700k to be recovered over 5-15 years |
| Exercise 4,000 per year in 2025-2027 | $259k per year | Each year’s AMT recovers 3-5 years out |
| Exercise AMT-neutral amount only | Small out-of-pocket each year | No AMT credit to recover |
AMT-neutral for him was approximately 330 shares per year, far below his vested position. That would leave most of his options unexercised and nearing expiration.
We also considered the §422 disqualifying disposition strategy. If he did not care about ISO treatment, he could exercise and same-day sell, recognizing the full $200 spread as ordinary W-2 income at 37% federal + 13.3% California = 50.3% effective. No AMT. Tax on 12,000 shares at this treatment: $1.21M. Net cash after tax and strike: $1.19M.
Compare to ISO qualifying disposition (exercise, hold 1 year, sell):
- AMT on exercise: $722k.
- Long-term capital gains on sale: 20% + 3.8% + 13.3% = 37.1%.
- If he holds for qualifying disposition and Tesla stays at $205, he pays LTCG on the $200 spread at 37.1% = 37.1% × 12,000 × $200 = $890k.
- Net tax across exercise + qualifying sale: $890k LTCG minus the AMT credit he recovers over time (say $722k) = net $168k. Plus, he has the $722k tied up in AMT-paid cash for years.
The comparison isn’t clean because AMT credits recover against future regular tax, not current. At his ongoing income level, his AMT credit could recover approximately $50-80k per year, taking 9-14 years to fully recover.
A practical way to think about it: qualifying disposition saves tax if the stock appreciates between exercise and sale (capital gains on appreciation). If the stock is flat or declines, disqualifying disposition is often better because it avoids AMT lock-up.
What he did
He exercised 4,000 shares in 2025 (qualifying-disposition intent), paying $18,120 of strike and $240,600 of AMT. He financed the AMT with a combination of cash savings and a $180k margin loan against his Tesla shares held in a brokerage.
He committed to exercising 4,000 more in 2026 and the final 4,000 in 2027, assuming his income situation remained comparable and Tesla’s stock stayed in a reasonable range.
He also sold 2,000 shares of previously-exercised Tesla stock that had met §422 holding requirements, realizing $322,000 of long-term capital gain at 37.1% = $119,500 of tax. This provided cash to partially offset the AMT bill and started diversifying his Tesla concentration.
What he wishes he had done differently
He did not use the 2022-2023 AMT-exemption window. In 2022, Tesla’s stock dropped from $400 pre-split-adjusted to $120. If he had exercised 4,000 shares in Q4 2022 at the lower FMV, his AMT preference would have been ($120 - $4.53) × 4,000 = $462k, producing maybe $140k of AMT. That is 60% less AMT than the same exercise in 2025. He held off waiting for “more certainty,” which cost him approximately $100k of AMT on the delayed exercises.
The lesson: AMT is a function of the spread at exercise. Exercising during stock drawdowns dramatically reduces the AMT burden for appreciating-over-time stocks. This requires psychological difficulty (exercising when the stock is underwater feels wrong) but the tax math favors it.
He also did not track his AMT credit balance historically. Several prior-year exercises had generated AMT that he had never reconciled properly. His CPA discovered $48,000 of previously-unclaimed AMT credit from 2019-2021 that could have offset $48k of 2022-2024 regular tax. Amended returns recovered most of it.
Third: he did not early-exercise his original 5,000 ISOs in 2018 under §83(b). At the time, the FMV equaled the strike of $68 (he received the grant at fair value), and the spread was zero. A §83(b) election on early-exercise unvested ISOs would have converted the entire position to restricted stock with a zero-spread basis. That would have eliminated all subsequent AMT and started the §422 and §1202 clocks immediately. The cost in 2018: $340,000 to exercise all 5,000 pre-split shares. He did not have that cash in 2018. But had he borrowed at 4% rates available then, the savings on AMT alone (over $1M in lifetime AMT on the position) would have dwarfed the interest.
Frequently asked
What happens to ISOs in a stock split?
The strike and share count adjust proportionally to preserve the grant’s economic value. After Tesla’s 5-for-1 then 3-for-1, his 5,000 shares at $68 became 75,000 shares at $4.53. Total spread position unchanged.
When does the 10-year expiration clock start?
From the grant date, not vesting or exercise. Most grant agreements set expiration at 10 years for ISOs and 10 years (or more) for NSOs. Check your specific plan.
Can I exercise post-termination?
ISOs typically expire 90 days after termination (per §422 requirements for ISO treatment). Some companies extend the window, but extended ISOs lose ISO treatment after 90 days and become NSOs.
What is AMT credit and how do I recover it?
AMT paid creates an AMT credit under §53. The credit carries forward indefinitely and offsets regular tax in years when regular tax exceeds tentative AMT. For high-income earners with large ISO exercises, the credit typically recovers over 5-15 years.
Is it worth exercising and holding for qualifying disposition?
Depends on expected stock movement between exercise and sale. Qualifying disposition converts ordinary-rate gain into capital-gain rate gain. If the stock rises post-exercise, the savings are real. If flat or declines, AMT paid may exceed the savings.
Composite scenario drawn from common patterns in our advisor network's casework. Names, companies, and exact numbers are illustrative. Not tax, legal, or investment advice.