RSUs vs. Stock Options: What’s the Difference?

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Depending on the company you work for, your compensation may include some form of equity — likely stock options or restricted stock units (RSUs). In this post, we’ll explain what they are, how they differ, and why you’re likely to be granted fewer RSUs than stock options (all other things being equal).

What are stock options?

Employer-granted stock options give you the option to buy company stock at a certain price at a certain time. Buying the stock is called exercising your options. The price you’ll pay to do that is called the exercise price or strike price — this price is set when you are granted your options. Employer-granted stock options can be incentive stock options (ISOs) or non-qualified stock options (NSOs), and their tax treatment varies (more on that below). Stock options are often subject to vesting, which means you may need to work at the company for a certain amount of time before you can exercise your options. 

What are RSUs?

RSUs are claims for shares of company stock given to employees as a form of compensation. Unlike stock options, you don’t have to pay to exercise RSUs — once they vest, they’re yours. Historically, RSUs were far more common for employees of public companies than those who work at private companies. But over the last 20 years, RSUs have become much more common at private companies that have closed rounds of financing at large valuations (over $1 billion) when that valuation isn’t likely to be achieved or justified for a few years. Like stock options, RSUs are usually subject to vesting.

Stock options vs. RSUs

Here’s a breakdown of the key differences between stock options and RSUs:

RSUs and stock options have very different tax treatment

Equity compensation can make your tax situation more complicated, and it’s important to understand what you could owe. Let’s take a closer look at the tax treatment of stock options and RSUs.

How RSUs are taxed

RSUs are taxed as soon as they vest and are liquid. In many cases, your employer will withhold some of your RSUs as payment for taxes owed at the time of vesting. You might also get the option to pay those taxes with cash in order to retain all of your vested RSUs. Either way, your RSUs will be taxed at ordinary income rates which could be as high as 37% at the federal level plus Social Security and Medicare taxes, depending on your income. You may owe additional taxes at the state level, depending on where you live.

How stock options are taxed

In contrast, stock options are taxed when you exercise them and/or when you sell them. This means you might want to exercise your options in a year when you anticipate your tax rate will be relatively low (or you have a lot of harvested losses to use from an investment manager like Wealthfront). If you early exercise your options before they’ve increased in value and file an 83(b) election within 30 days, then you won’t owe any taxes until you sell. 

The rest depends on whether you have NSOs (which are more common) or ISOs. With NSOs, you will be taxed at ordinary income rates on the difference between the exercise price and the current fair market value when you exercise. If you then hold the shares for over a year, any gains or losses going forward will be taxed at the lower, long-term capital gains rate (which ranges from 0% to 20%). If you have ISOs, exercising your options is not a taxable event for regular tax purposes. Any increase in value over the  exercise price will be taxed at the long-term capital gains rate when you sell as long as you meet both of the following conditions:

  1. You hold the shares for at least two years after they were granted to you.
  2. You hold the shares for at least one year after exercising them

You should also be aware of the alternative minimum tax (AMT) if you have ISOs. AMT is a separate tax system designed to make sure high earners pay at least a minimum (hence the name) amount of taxes. If you exercise your ISOs and don’t sell them that year, the difference between the exercise price and the fair market value at the time of exercise is subject to AMT even if you didn’t sell any shares. AMT can make filing your taxes far more complicated, which is why we think it’s smart to consider working with a tax professional if you think you might be subject to AMT. Whether or not you pay AMT is largely dependent on your income — in 2021, if you’re a single filer making less than $73,600 or a married couple filing jointly making less than $114,600, you don’t need to worry about it. If you earn more than that, however, you’ll need to calculate your taxes under both systems (AMT and the regular system) and pay whichever amount is bigger. The good news is your AMT payments are credited against the taxes owed upon sale of your options.

Why you’ll get fewer RSUs than stock options for the same job

You should expect to receive fewer RSUs than stock options for the same job because RSUs don’t have an exercise price. Let’s look at a hypothetical private company example to illustrate this. Imagine a company with 10 million shares outstanding that just completed a financing at $100 per share, which translates to a $1 billion valuation. If you knew that the company would ultimately be worth $300 per share, then you’d need to issue 11% fewer RSUs than stock options to deliver the same net value to the employee. 

Here’s a chart to help you visualize this example:

You should also keep in mind that RSUs have value independent of how the company performs, whereas stock options can become worth less than the exercise price if the company struggles. Put more simply: RSUs are less risky than stock options.

Key takeaways: RSUs and stock options

If you receive equity as part of your compensation, here’s what you need to remember about RSUs and stock options:

  • Both RSUs and stock options give you the opportunity to own a piece of the company you work for.
  • RSUs don’t have an exercise price, but stock options do — that’s why you’ll receive fewer RSUs than stock options for the same job.
  • RSUs give you less flexibility when it comes to taxes (both the timing and the rate) than stock options do.

Hopefully this information helps you confidently navigate the equity portion of your compensation. For more guidance on how to handle RSUs, check out this blog post for our advice on managing vested RSUs — generally, we think it’s smart to sell some portion of your RSUs and invest in a more diversified way (Wealthfront’s Investment Accounts make this easy). For a deep dive on all things related to equity, we encourage you to read Wealthfront’s Guide to Equity & IPOs.

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