What is a Restricted Stock Unit (RSU)?

A Restricted Stock Unit, commonly referred to as an RSU, is a commitment made by an employer to grant an employee actual shares of the company stock at a future date. It is a form of deferred compensation.

In the early days of a startup, founders often lean heavily on stock options. However, as a company matures, the compensation strategy often shifts. RSUs become a critical tool in this evolution.

When you grant an RSU, you are not giving the employee the stock immediately. You are promising to give it to them once certain conditions are met. Until those conditions are satisfied, the stock is restricted. It cannot be sold or transferred.

This distinction is important for retention. The employee has a tangible stake in the future value of what you are building, but they must remain with the company to realize that value.

The restrictions placed on these units usually fall into two categories.

• Time-based vesting: The employee must stay employed for a specific duration.
• Performance-based vesting: The company or the individual must hit specific milestones.

Once the vesting period ends, the restriction lifts. This is called settlement. At this moment, the units convert into actual shares of stock. In a public company, this is straightforward. The shares are liquid and have a market price.

In a private startup environment, this creates complexity. If the shares vest but the company is not public, the employee owns stock they cannot sell but may owe income tax on. This is a liquidity trap.

To solve this, many startups use a double trigger vesting schedule. The first trigger is time based. The second trigger is a liquidity event, such as an IPO or an acquisition. The RSUs do not officially vest until both happen, protecting the employee from a tax bill they cannot pay.

Founders often confuse RSUs with stock options, but the economic mechanics are different.

A stock option gives the employee the right to buy a share at a set price, known as the strike price. If the company valuation does not rise above that strike price, the option is worthless. It is underwater.

RSUs are different in the following ways:

• No purchase necessary: The employee does not pay for the share.
• Always have value: Even if the stock price drops, the RSU is worth the current market value of the share (unless the value goes to zero).
• Tax treatment: RSUs are generally taxed as ordinary income upon vesting, whereas options have different tax treatments depending on whether they are ISOs or NSOs.

For a founder, options are better for preserving cash in the early stages. RSUs are often better for preserving value perception in growth stages when the strike price for new options would be very high.

Deciding when to introduce RSUs requires analyzing your current growth phase. Usually, this happens when a startup has raised significant capital and the valuation is high enough that the upside of an option is less guaranteed.

You must ask yourself specific questions before making this transition.

Does your payroll system handle the tax withholding required when RSUs vest? Are you prepared for the dilution impact, as RSUs are full value grants? Do you have a clear path to liquidity that justifies the double trigger mechanism?

There is no single correct answer for every company. The goal is to align the incentives of the team with the long term health of the business entity. You want a compensation structure that rewards endurance and value creation.