Anduril Stock Options Explained: A Tax Playbook for Early ISO Holders

Anduril’s valuation has moved fast. The company was valued at $4.6 billion after its Series D round in 2021, and recent reports now place a possible new round near $60 billion. For early employees holding incentive stock options, that kind of jump can create meaningful paper gains, but it also brings one of the most important tax questions into focus: when should you exercise?

That decision is not just about believing in the company’s future. It’s about understanding how the Alternative Minimum Tax works, how much cash you may need before liquidity exists, and whether a staged exercise strategy could reduce the tax pressure over time.

This guide walks through the AMT planning window for Anduril’s early ISO holders, using a representative 2022 grant to show how strike price, current value, exercise size, and timing can change the outcome.

What changed in Anduril’s valuation, and why does it matter?

The key shift is not just that Anduril’s valuation increased, but actually how far the company has moved relative to where early employee strike prices were set.

Most early ISO grants were issued when Anduril’s internal valuation was in the single-digit billions, with strike prices often around $5 per share for 2021–2022 hires. Today, secondary market references and recent funding discussions suggest prices that are dramatically higher.

That gap creates what’s known as the bargain element:

(Current fair market value – strike price)

This is the number that drives tax exposure when shares are exercised.

A simple way to frame it

• Low strike price → fixed at grant
• Higher current value → moves with each funding round
• The difference → becomes taxable under AMT

As that spread widens, the same number of shares produces a much larger tax impact. That’s why timing matters. Exercising earlier locks in a smaller spread. Waiting increases potential upside, but also increases the size of the tax calculation.

Why do early Anduril employees have more flexibility than newer hires?

Not all equity works the same way, and Anduril’s shift from ISOs to RSUs is a key dividing line.

Early employees typically received incentive stock options (ISOs), while newer hires are more likely to receive restricted stock units (RSUs). The difference is not just technical. It changes how and when tax is triggered.

ISOs (early employees)

• You decide when to exercise
• You control when the tax clock starts
• You can potentially qualify for long-term capital gains
• You can plan around AMT thresholds

RSUs (newer hires)

• Shares vest automatically
• Tax is triggered as ordinary income at vest
• No control over timing
• No AMT planning window

That control is what creates opportunity for early employees. It also introduces the need for planning, because the timing decision directly affects both tax exposure and long-term outcomes.

How does AMT actually work when you exercise Anduril ISOs?

At a high level, exercising ISOs does not trigger regular income tax if you hold the shares. Instead, it introduces a separate calculation under the Alternative Minimum Tax system.

That’s where most of the confusion starts.

Step 1: Calculate the bargain element

When you exercise, the IRS looks at the difference between what you pay and what the shares are worth today:

(Fair market value – strike price) × shares exercised

This number is added to your income for AMT purposes.

Step 2: Compare regular tax vs AMT

You effectively run two tax systems in parallel:

• Your regular tax calculation (based on salary, deductions, etc.)
• Your AMT calculation (which includes the bargain element)

If your AMT is higher, you pay the difference.

Step 3: Identify the crossover point

There’s a threshold where exercising more shares starts to trigger AMT.

• Below that point → no additional tax
• Around it → partial AMT
• Above it → AMT increases quickly

That threshold is different for everyone, depending on income, filing status, and deductions.

Why exercise size matters more than people expect

This is where planning actually comes into play.

The same grant can produce completely different outcomes depending on how many shares you exercise in a single year.

• A smaller exercise may fall entirely within the “AMT-free zone”
• A larger exercise can push you into higher AMT brackets
• A full exercise in one year can significantly increase your tax bill

That’s why many employees don’t exercise all at once. They sequence it.

A simple way to think about it

• Exercise less → lower immediate tax, longer exposure to future price increases
• Exercise more → higher tax today, but locks in current valuation for tax purposes

There is no universal answer here. It’s a trade-off between tax, risk, and timing.

What does this look like with a real Anduril ISO grant?

To make this concrete, take a representative early grant:

• 4,000 incentive stock options
• March 2022 grant date
• $5.29 strike price
• ~$114 current fair market value

By 2026, the shares are fully vested but unexercised. That creates a wide spread between the strike price and current value – and that spread is what drives the AMT calculation.

What changes as you exercise more shares?

The key thing to understand is that the tax impact does not scale evenly. It builds as you exercise more in a single year.

At smaller exercise levels, the bargain element can often be absorbed by your existing tax profile, meaning little or no AMT is owed. As you increase the number of shares, more of that income flows into the AMT system, and the effective rate starts to climb.

By the time you approach a full exercise, the marginal impact begins to resemble the upper AMT range, even though earlier shares were effectively taxed at a much lower rate.

Why this matters for planning

This is where most of the decision-making happens.

You’re not just deciding whether to exercise. You’re deciding how much to exercise in a given year.

• Exercising a smaller portion may keep you in a lower or zero AMT zone
• Exercising a larger portion locks in today’s valuation but increases immediate tax exposure
• Exercising everything at once concentrates both tax risk and timing risk

That’s why many employees don’t treat this as a one-time decision. They treat it as a sequence.

The takeaway from the example

The same 4,000-share grant can produce very different outcomes depending on how it is executed. The difference isn’t just a few percentage points. It can materially change the total tax paid and the timing of that tax.

How does California change the picture?

For Anduril employees based in California, there’s a second layer to consider beyond federal AMT.

California applies its own AMT system, calculated separately and typically at a 7% rate on California AMT income. While the mechanics differ slightly, the effect is straightforward: it increases the total tax impact of exercising ISOs.

What this means in practice

• Federal AMT is not the full picture
• State AMT can meaningfully increase the total bill
• The combined impact is often higher than expected

As a rough guide, California can add a noticeable percentage on top of the federal AMT for the same exercise, depending on income and deductions.

That’s why planning around exercise size and timing should always account for both systems, not just the federal side.

What happens to the AMT you pay?

AMT is often misunderstood as a permanent cost, but in many cases, it functions more like a timing difference.

When you pay AMT on an ISO exercise, you typically generate a Minimum Tax Credit. That credit can be used in future years to offset regular tax, especially once the shares are sold and your tax profile shifts back toward the standard system.

What to keep in mind

• AMT paid today can often be recovered over time
• The recovery usually depends on future income and liquidity events
• The timeline is not immediate and can take several years

The key point is that while AMT may not be lost, it still requires real cash upfront. That’s why it needs to be planned carefully, especially when liquidity is uncertain.

Planning around private-company equity before liquidity arrives

Anduril’s growth story highlights something many private-company employees experience at some point. The value on paper can move quickly, but the financial decisions arrive well before any liquidity event.

At Augustus Wealth, we work with employees, founders, and investors across aerospace, defense, and high-growth technology to plan around stock options, AMT exposure, and future liquidity. That includes helping clients evaluate when to exercise, how much to exercise each year, how to manage the tax impact, and how to think about concentration risk as valuations climb. Our ISO calculator can also help model different exercise scenarios before those decisions are made.

For early employees, the window before a liquidity event is often where the most important decisions get made. The goal is not just to participate in the upside, but to approach it with a clear plan around timing, taxes, and long-term wealth.

 

 

 

DISCLOSURE:

Augustus Wealth, LLC is a registered investment adviser. Advisory services are only offered to clients or prospective clients where Augustus Wealth, LLC and its representatives are properly licensed or exempt from licensure. This financial planning assessment is solely for informational purposes. Past performance is no guarantee of future returns. Investing involves risk and possible loss of principal capital. This assessment is built based off information provided by the client and cannot be relied upon as financial advice. No advice may be rendered by Augustus Wealth, LLC unless a client service agreement is in place.