What Are Incentive Stock Options and How Do They Work?

If you are building a company and trying to hire the best talent, you have probably heard about incentive stock options. Maybe a candidate has asked about equity in an interview, or you have wondered how other startups attract strong talent without paying big corporate salaries.

Incentive stock options can help you compete for strong hires, especially when you cannot offer high pay. In this article, we will explain what they are, how they work, and what to consider before you offer them.

1.0 What are incentive stock options?

Incentive stock options (ISOs), also known as statutory stock options, are a way companies give employees a chance to buy company shares later at a fixed price, called the “strike price.” No shares are given right away, as employees just get the option to buy in the future. Usually, the strike price matches the stock’s value on the day the options are granted.

If the company grows and the stock price goes up, employees can buy shares at the original lower price. The difference between what they pay and what the shares are worth is their gain. And that potential upside is a big part of why ISOs work as an incentive.

Many organizations nowadays use solutions like Salary.com’s Compensation Software to manage these programs, making sure grants are fair, compliant, and fit into the company’s overall pay strategy.

1.1 Why offering ISOs matters for your business

Here's why offering these statutory stock options is important:

• Save cash: ISOs let companies offer equity instead of big salaries, keeping money in the business for growth.

• Attract talent: Stock options make offers stand out, helping startups hire people who care about long-term gains.

• Create ownership: Employees feel like owners, so their efforts directly impact the company’s success.

• Keep employees longer: Vesting schedules reward staying with the company, lowering turnover and keeping teams stable.

• Boost performance: When employees share in profits, they work harder and innovate more, benefiting everyone.

2.0 How do incentive stock options work?

Here's what the process looks like from your side for statutory stock options to work:

2.1 Setting up an equity plan

Before giving out ISOs, you need an official equity plan approved by your board and shareholders. This plan decides:

• how many shares are available,

• the rules for granting them, and

• what employees have to do to earn them.

Most companies work with a startup attorney to draft this. A solution like Salary.com Compensation Software can also help simplify this process by tracking shares, modeling allocations, and keeping the plan in compliance.

2.2 Determining the strike price

You need to set the strike price at the stock’s fair market value on the grant date. For private companies, this usually means getting a 409A valuation, which is an independent check of your company’s value. It is not optional.

If the price is too low, the IRS can hit employees with taxes and create problems for you. Update the 409A at least once a year or after big funding rounds.

2.3 Granting options

Once the plan is ready, you can grant options to employees. Each grant should have an agreement showing:

• the number of options,

• the strike price,

• vesting schedule, and

• expiration date.

2.4 Vesting schedules

You decide how options vest. A common setup is four years with a one-year cliff. That means employees get nothing in the first year, then 25% after 12 months, and the rest vests monthly over the next three years.

This way, if someone leaves early, they don’t take a big chunk of equity with them.

2.5 The $100,000 annual limit

The IRS limits how much can qualify as ISOs each year. Options that first become exercisable in a year can’t be worth more than $100,000 based on the fair market value of the shares at the time of grant.

Anything above that limit automatically converts to NSOs. You need to keep track of this for bigger grants.

2.6 Reporting requirements

As an employer, you have to report ISOs. When an employee exercises their options, you must give them a Form 3921 by January 31 of the following year.

This form reports the exercise and helps the employee calculate any potential AMT (Alternative Minimum Tax) liability. You also need to file copies with the IRS.

2.7 Expiration date

Options have an expiration date, which is included in the grant agreement. Most ISOs expire 10 years from the grant date.

If an employee leaves the company, they usually have 90 days to exercise their vested options before they expire. If an employee becomes disabled, that window extends to 12 months. In case of death, unexercised options can be exercised by the estate for up to 12 months (or the original term).

After that, the options are gone. Make sure employees are aware of this when they leave.

2.8 Payout

Employees do not receive money when options are granted. The payout happens when they sell their shares. Exercising and selling are two separate events.

Employees first exercise their options to acquire shares, then sell them later (or immediately). Note that exercising alone can trigger AMT liability even before any shares are sold.

The gain is the difference between the strike price and the sale price. For example, if the strike price is $1 and the shares sell for $10, the employee earns $9 per share.

If they hold the shares long enough, at least two years from the grant and one year from exercising, that profit is taxed at the lower long-term capital gains rate instead of as regular income.

If those requirements are not met, it is treated as a disqualifying disposition and taxed as ordinary income.

3.0 FAQs

Here are frequently asked questions related to the topic:

3.1 Do ISOs cost the company anything?

Not in direct cash, but they do reduce everyone’s ownership a little because they add more shares. You need to manage the option pool so founders and early investors don’t lose too much.

3.2 What's the difference between ISOs and RSUs?

ISOs give employees the right to buy shares at a set price. RSUs (restricted stock units), on the other hand, are a promise to give shares outright once conditions are met, usually vesting.

3.3 Should we offer ISOs or NSOs?

For employees, ISOs are generally more attractive due to the tax advantages. However, NSOs are more flexible, as they can be granted to contractors and advisors too, and there's no $100,000 annual cap. Many companies use both: ISOs for employees and NSOs for everyone else.

3.4 What if our company gets acquired?

Your equity plan should explain what happens to options in a sale. Common provisions include single-trigger, which means all unvested options vest when the company is bought. There’s also double-trigger, which means unvested options vest only if the employee is let go after the sale. Buyers will check your cap table during due diligence, so having clean, well-documented equity records really matters.

3.5 Do we need a lawyer to set this up?

Yes. Setting up an equity plan involves securities law, tax law, and corporate governance. And mistakes can be costly, both for your company and your employees. That’s why it is always best to work with a lawyer who knows startup equity to set it up correctly.