For early-stage startups, stock options are better. Later-stage startups (typically Series C+ with a $500M+ valuation) can use Restricted Stock Units (RSUs) to attract and retain senior talent, but they must use a 'double-trigger' vesting structure. This prevents employees from owing tax on illiquid shares, linking the tax event to a liquidity event like an IPO or acquisition.
Key takeaways
- Use stock options for early-stage (pre-seed to Series B). Don't use RSUs.
- Use RSUs for later-stage (Series C+) to offer more predictable compensation.
- ALWAYS use "double-trigger" vesting for private company RSUs to avoid a tax disaster.
- RSU grants are based on a dollar value, not a percentage of the company.
- Communicate clearly to employees how vesting and taxes work before they sign.
- Consult experienced legal counsel before issuing any equity.
As you scale, your equity philosophy has to evolve. The stock options you gave your first ten employees aren’t always the right tool for hiring your 200th. You start hearing about Restricted Stock Units (RSUs) and how all the public companies use them. They seem simpler, more predictable. They are also dangerously easy to get wrong.
For most early-stage startups (pre-seed, seed, Series A), the answer is simple: use stock options (ISOs or NSOs), not RSUs.
But if you are a later-stage founder (Series C or beyond) running a company with a significant and stable valuation, RSUs can be a powerful tool for attracting and retaining senior talent. This guide will show you how to use them without accidentally setting a tax bomb for your team.
An RSU is a promise from you to an employee: if they stay with the company for a certain period and/or other conditions are met, you will give them a specific number of shares at a future date. They don’t buy the shares; you grant them.
The conditions are called "vesting triggers." For private companies, it's critical you use two of them.
This is the most important part of this guide. If you only read one section, read this one.
With a simple time-based RSU (a "single-trigger" RSU), the moment the employee vests, the IRS considers the value of those shares as ordinary income. Your employee immediately owes income and payroll taxes on the full value of the vested shares, based on your current 409A valuation.
Here’s the disaster scenario: You grant an engineer RSUs that vest over 4 years. On their first anniversary, they vest $100,000 worth of your private stock. Congratulations, you just handed them a tax bill for ~$40,000 (depending on state and federal rates). But they can't sell the stock to pay the tax. It's illiquid. You haven’t given them a benefit; you’ve given them a massive financial liability.
This isn't a theoretical risk. It’s a real, company-killing mistake. You will destroy employee morale and trust.
To prevent the tax bomb,…
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Frequently asked questions
- What's the main difference between RSUs and stock options?
- RSUs are a grant of shares, while options are the right to buy shares at a set price. RSUs always have value unless the stock is worthless; options can become worthless ('underwater') if the stock price drops.
- Why don't early-stage startups use RSUs?
- Standard RSUs trigger a tax bill for the employee upon vesting, even if the shares are illiquid private stock. Stock options are better suited for the high-risk, high-growth nature of early companies, as they defer the purchase and tax until exercise.
- What is double-trigger vesting for RSUs?
- It's a structure where shares are only delivered after two conditions are met: the employee completes their time-based service, AND the company has a liquidity event (like an IPO or acquisition). This aligns the tax event with the ability to sell shares.
- Can I file an 83(b) election on my RSUs?
- Generally, no. An 83(b) election lets you pay taxes on equity at grant, but with double-trigger RSUs, the shares aren't delivered until much later, so there's nothing to file for at grant.
- How are RSU grants calculated?
- Unlike early option grants that are often discussed as a percentage, RSU grants are calculated based on a target dollar value. The number of RSUs is this dollar value divided by the company's current 409A share price.
