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Legal & Compliance

Alternative Minimum Tax (AMT)

Last updated

Quick Answer

A parallel tax system that can create unexpected tax liability when exercising incentive stock options.

What it is

The AMT is a parallel U.S. tax calculation that ensures taxpayers pay at least a minimum amount of tax. For startup employees, exercising ISOs can trigger AMT because the spread between exercise price and fair market value counts as AMT income, even though no cash is received.

In Practice

An employee exercises 10,000 ISOs at $1 when the 409A valuation is $10. The $90,000 spread triggers AMT, creating a potential tax bill of ~$25,000 on paper gains they can't sell.

Operational context

What good looks like

  • The term is tied to a real workflow, not just a definition.

  • Ownership, timing, and evidence are clear.

  • The reader can tell what decision the concept supports.

  • Related terms point to the next useful explanation.

Why It Matters

AMT has caused financial hardship for startup employees who exercised options in companies that later failed. Understanding AMT is critical before making exercise decisions.

VC Beast Take

AMT is the silent killer of startup equity dreams. Many employees learned this the hard way during the dot-com bust.

Related tools and reading

Term Family

Related concepts

ISOExercise Price409A ValuationStock Options

Further Reading

Startup Equity Compensation Explained: Stock Options, RSUs, and More

ISOs, NSOs, RSUs, restricted stock — startup equity comes in many flavors. Here's what each type actually means for your compensation, your taxes, and your financial future.

Related Guides

How to Set Up a Startup Option Pool: ESOP Guide for Founders

Intermediate

Setting up your employee option pool wrong costs you money and credibility. Here's the complete playbook: pool sizing, option vs RSU, ISO vs NSO, vesting schedules, and tax implications.

Frequently Asked Questions

What is Alternative Minimum Tax (AMT) in venture capital?

The AMT is a parallel U.S. tax calculation that ensures taxpayers pay at least a minimum amount of tax. For startup employees, exercising ISOs can trigger AMT because the spread between exercise price and fair market value counts as AMT income, even though no cash is received.

Why is Alternative Minimum Tax (AMT) important for startups?

Understanding Alternative Minimum Tax (AMT) is critical for founders navigating the fundraising process. It directly impacts deal terms, valuation, and the relationship between founders and investors.

What category does Alternative Minimum Tax (AMT) fall under in VC?

Alternative Minimum Tax (AMT) falls under the legal category in venture capital. This area covers concepts related to the legal frameworks and compliance requirements in venture capital.

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