Equity Compensation Fundamentals: From ISOs to ESPPs

Equity comes in several forms—ISOs, NSOs, RSUs, RSAs, and ESPPs—and each has different tax treatment at grant, vesting, exercise, and sale. A CPA translates your grant documents into a clear picture of your total position and an actionable exercise-and-diversification plan.

That's a reasonable starting point. Equity compensation comes in several forms -- incentive stock options (ISOs), non-qualified stock options (NSOs), restricted stock units (RSUs), restricted stock awards (RSAs), and employee stock purchase plans (ESPPs). Each has different tax treatment at grant, vesting, exercise, and sale. Most employees receive grant documents that explain the mechanics but not the tax consequences or strategic choices involved.

What a CPA reviews in the first meeting. Your grant agreements, vesting schedules, current fair market value (or 409A valuation for private companies), and any prior exercises or sales. From this, they build a picture of your total equity position and the tax implications of each action you could take -- exercise, hold, or sell.

The output is a plan, not just a tax return. A CPA who specializes in equity compensation creates an exercise-and-diversification roadmap: how many shares to exercise each year, when to sell, how to manage AMT exposure, and how equity income interacts with your other compensation. This is forward-looking planning, distinct from filing last year's return.

The pitfall: Equity compensation decisions are often time-sensitive -- vesting dates, expiration dates, and company events create windows that close. Starting the conversation before those deadlines is more valuable than after.