What is it:
In equity compensation, a plan document is the formal, board-adopted document that sets the rules for a company's equity awards. It defines who can receive awards, which types of awards the company can grant, how many shares are reserved for them, and who administers the plan, usually the compensation committee. Most grants are made under the plan through an award agreement, which supplies your specific terms and incorporates the plan by reference. Some grants to newly hired executives are made outside the plan but are still governed as if they had been issued under it.
Why does it matter:
Some of the terms that most affect what your equity is worth to you can sit in the plan rather than in your agreement, including how a change of control is defined, what counts as termination for cause, and how much authority the committee has to adjust awards. Many plans also state that the plan controls if it conflicts with an award agreement. The plan also determines whether ISOs can be granted at all: a plan can only issue ISOs if it states the maximum number of shares available for them and shareholders approve it within 12 months of its adoption.
What do people most often get wrong:
People often rely on summaries of their equity, such as a benefits overview, an equity account website, or an award letter, and never read the plan itself. It is easy to assume that the plan document is either unavailable to you or too long to be useful. Neither is true. Many companies make the plan available alongside your grant, and you can ask for a copy. At a public company, the plan is also filed publicly with the SEC and summarized in the proxy statement whenever shareholders are asked to approve it or add shares to it.