If you work for a tech startup, you may have non-qualified stock options (NSOs). 

Hopefully they’ll make you money someday. But how much you’ll make depends for a good part on how they’re taxed.

It isn’t easy to educate yourself on this. Most info isn’t specific to the tech startup situation, or it’s written in jargonese, or it’s too high-level to be practically useful.

That’s why we wrote this guide. An in-depth resource on NSO taxes and strategies, in plain English and with helpful visualizations.

Still got some questions? Always feel free to hit us up for a chat in the bottom-right. ↘️ 


NSOs are taxed when you exercise them, and then later when you make money with them (when your company exits and you sell your shares). 

They don’t get taxed either when the company first grants you them or when they vest.

Assuming that the company you work for:

Then the key to minimizing your tax burden (both at exercise and at sale) is to exercise as early as possible. 

Here’s why:

Warning: when exercising your NSOs, your employer will withhold only some of the taxes. It’s up to you to pay the remainder to the IRS. This often surprises people.

(Want to know exactly how much you'll be taxed? Use our free Exercise Tax Calculator for taxes on exercise and the Profit Simulator for taxes on sale.)

What are NSOs?

Non-qualified stock options (or NSOs) are a type of stock option that do not ‘qualify’ for the same favorable tax treatment that other types of stock options (specifically ISOs) do. 

What is the difference between ISOs and NSOs?

With NSOs you’re more likely to be taxed when you exercise them than with ISOs. And if you are taxed, then it’s usually at a higher rate. 

When you later make money with them you’re taxed again at an effective rate that’s often higher than with ISOs (more on that later).

The one advantage of NSOs is that how they are taxed is a bit more straightforward and easier to understand than with ISOs. Although we’re not gonna lie – it’s still pretty complex.

The big picture: what’s the best tax strategy for your NSOs?

Before the rest of this guide dives into the details, let’s take a holistic look.

If you work for a constantly growing startup that ends up succeeding, the best tax strategy is to exercise your NSOs as early as possible.

That’s because:

Here’s a real-world example:

Say you join a startup and get 15,000 NSOs with a $3 strike price. Eventually, the company IPOs and you get to sell the shares for $150 each.

Over time, the 409A valuation of your company grows. (We’ll explain what that is in a bit, but in short, it’s an appraisal of a company share for tax purposes.)

Say this is the timeline:

Then this gives 5 distinct moments at which you could exercise:

When should you exercise your NSOs?

You could exercise at any of these points in time – but your tax situation would be different at each.

Depending on when you exercise, the amount of cash you need to exercise as well as your net profit change.

Here’s the amount of cash you’d need to exercise at A, B, C, D or E:

Assuming California tax rates – see later in this guide for calculations.

If you wait all the way until you sell (point E), you don’t need any cash to exercise — because you can cover the costs with your proceeds.

But if you exercise before selling, you need to pay out of pocket. 

And the higher the 409A, the more cash you need. (This is because you trigger a higher tax bill – more on that below). 

So why would anyone exercise before selling? Because otherwise you’d end up with the lowest possible net profit:

If you exercise at least 12 months prior to selling – which is the case at A, B and C – your net profit is higher. 

And the lower the 409A when you exercise, the higher your net profit gets.

In summary, here's what happens depending on when you exercise:

Why it works like this 🤔

Normally, the money you make from NSOs is taxed just like your salary. 

But if you exercise your NSOs at least 12 months before selling them, you get a tax discount. That can increase your net profit by up to 27% (the above image).

The problem? 

As soon as you exercise, you have to prepay a part of these taxes. So exercising before IPO is a trade-off: it means paying some tax now so you’ll pay less tax overall.

Things depend on the 409A valuation of the company at the time of your exercise:

  1. The higher the 409A, the smaller the overall tax discount you get 
  2. The higher the 409A, the more tax you need to prepay

Generally, as long as a company is growing, its 409A increases over time. 

So, in our example, this is what the taxes do depending on when you exercise:

In conclusion:

If you work for a constantly growing startup, then the longer you wait to exercise your NSOs, the less net profit you’ll end up with and the more cash you’ll need to do it. 

What exactly is a 409A valuation?

The 409A valuation (a.k.a. fair market value) is an appraisal of the value of a company share for tax purposes. Your employer is required to have it re-assessed by a third party at least once a year – or when something impactful happens, like a new funding round. 

The 409A reflects company growth. Is the company in a better place than last time? Then the 409A will rise. So a higher 409A is a good sign for the company, but it’s bad for your tax situation if you haven’t yet exercised.

More on 409A valuations here.

What if exercising my NSOs is too expensive?

Of course, $261k or even $531k is a huge amount to pay for your NSOs.

Unfortunately, these aren’t uncommon numbers for employees at the most successful and high-growth startups. 

See, for example, how much these Snowflake and DoorDash employees had to pay. Among Secfi users, the average exercise cost is $505,923

Even if you have that kind of money, putting your personal savings on the line is risky since it’s not guaranteed that your company will actually manage to reach a successful exit.

So what do you do if you still want that tax savings? Or what if you recently left your company and now have a deadline to exercise your NSOs? 

That’s exactly why exercise financing exists, which we offer at Secfi. 

Here’s how our exercise financing works:

We make money only if there is a successful exit. If there is, you’ll pay us back more than the original amount. (But because of the tax savings, you’re often still at a net benefit vs not having exercised.)

If there’s no exit, you don’t owe us anything (and we’ll take the hit). 

See www.secfi.com/products/options-exercise to check if exercise financing is available for you, and at what rates.

Is it always better to exercise my NSOs as early as possible?

No. In the example we made two assumptions:

  1. Your company successfully exits (i.e. you get to sell your NSOs at a profit)
  2. The 409A valuation of your company keeps rising

Regarding #1, most startups never get to that point. 

That’s why exercising early on is risky. If the company later goes out of business, you’ve lost the money you spent. (You may be able to recover some of the taxes – but more on that in a future blog post.)

If you want to exercise your NSOs but don’t want to risk losing money, non-recourse financing is a solution.

Regarding #2, sometimes the 409A valuation of a company temporarily dips. This means you can exercise at a lower cost, so in that scenario waiting actually makes it cheaper. 

This is uncommon, but it happened at Airbnb

They could justify a lower 409A valuation when the business was impacted by covid, which enabled employees to exercise at a tax discount (before the 409A went up again shortly after).

It’s difficult to time this, however. If you are long-term optimistic about the company, you should expect the 409A valuation to go up – unless you foresee a specific reason why the company would take a hit in the short term.

Now that you’ve got the big picture, let’s dig into the details of just how NSOs are taxed...

So how exactly are NSOs taxed?

NSOs are taxed at ordinary income tax rates (the highest possible rate, just like your salary) twice:

  1. When you exercise them 
  2. Then again when you make money with them after your company exits.

But as we already mentioned, usually the earlier you exercise, the less you’ll owe (especially for fast-growing companies).

That’s because some of your taxes convert from ordinary income rates to the lower long-term capital gains rates. More details on how this works below.

Are NSOs taxed when initially granted?

No. There’s no tax due when your company initially grants you the NSOs (i.e. awards you with them).

Are NSOs taxed when they vest?

No. After the initial grant, most NSOs follow a vesting schedule that dictates when you actually ‘get’ them. But when they vest, there’s still no tax due.

How are NSOs taxed when exercised?

In short:

Ordinary income tax rates are usually ~35-52% for our clients in California. We’ll assume 45% in this article – use our Exercise Tax Calculator to get a personalized figure.

The costs of exercising an NSO, visualized:

Let’s go through this step by step with some actual numbers.

Here’s a real-world example:

Say you have 15,000 NSOs with a $3 strike price, and the current 409A valuation is $35.

If you exercise one of these NSOs, you’ll pay your company $3 to buy a share. 

But the IRS views that share to be worth $35. The difference between the $3 and the $35 counts as a $32 phantom profit (also called the spread).

The phantom profit is taxed at ordinary income rates. So 45% of $32 is $14, which means you’ll pay $17 to exercise each NSO.

Say you decide to exercise all 15,000 NSOs. Then:

Including taxes and the strike price, your exercise costs are $261,000 ($216,000 + $45,000).

While that’s already more than most people realize they’ll have to pay, there are a few additional things to watch out for:

Warning #1: your employer will not yet charge you the full amount

Because the IRS counts this ‘profit’ as income, your employer is required to withhold taxes on it. 

But since your employer hasn’t ‘paid’ you anything, they charge you a part of the taxes whenever your tax liability exceeds your salary.

And there’s an additional catch:

Your employer usually only charges you the bare minimum, say 25%. 

Many employees think that’s all they owe. But you still owe the other ~20%, and it’s up to you to pay this to the IRS.

We’ve seen cases of people not realizing this and scrambling to come up with an extra $100K when taxes are due. Make sure to figure your full tax liability before exercising.

Warning #2: the later you exercise, the higher your tax liability can become

If your company keeps growing – like successful startups do – exercising your NSOs becomes increasingly expensive over time. 

And the faster the company grows, the worse it gets.

This is because of the 409A valuation. The higher the 409A, the larger your phantom profit, and the more tax you’ll owe. 

The 409A is updated at least yearly and reflects company growth. 

Say, for example, that the 409A valuation of your company grows from $35 now to $50 one year later and $75 two years later:

Then the total cost to exercise your 15,000 NSOs grows from $261,000 to $362,250 to $531,000:

Exploding exercise costs effectively lock you out from exercising your NSOs. This is especially a problem at high-growth startups. See these Snowflake and DoorDash case studies for real-life examples.

Warning #3: exercising NSOs can push you into a higher tax bracket

Reading the above examples, you might think: “Wait, 35-52%? I live in California and my income taxes never reach 35%.”

The problem is your NSO phantom profit counts as income on top of your salary. 

If your annual salary is $200,000 but your phantom profit $480,000, in the year you exercise your NSOs you’ll owe tax as if you’ve made $680,000. 

This will push you into the higher tax brackets, and can lead to an effective tax rate as high as 52%.

Tip: if your employer allows early exercising, you can exercise tax-free

A higher 409A valuation means more taxes, but this also works the other way around. A lower 409A means less taxes. 

And if the 409A is equal to your strike price, you pay no taxes at all (because your phantom profit is zero).

That’s exactly the case when you’re first granted your NSOs, because your strike price is based on the 409A valuation at the time. So if you exercise before the 409A valuation goes up, it’s tax-free.

You can only do this if your company allows early exercising, or exercising options before they vest. 

At most companies you’ll have to wait for your NSOs to vest instead, by which time it’s likely the 409A has already increased.

Warning: if you early exercise, you need to file an 83(b) election with the IRS within 30 days. This makes it official. If you forget to file it, you’ll still be taxed when your NSOs vest in the future.

Use an NSO tax calculator to figure out your exact tax burden

In the above we’ve used an effective tax rate of 45%, which is what we’re often seeing among our clients in California. But it really depends on:

If you want a personalized figure, use our Exercise Tax Calculator. It’s completely free. Just create an account, enter your tax and equity details and it runs the numbers for you.

How are NSOs taxed when you make money (i.e. sell them after an exit)?

When you make money by selling your equity in an IPO or acquisition, your profit is taxed.

In the worst case, it’s again taxed at ordinary income rates (the highest possible rate, just like your salary). 

But under the right conditions you get a discount.

The amount of tax you owe depends on two things:

  1. Did you exercise your NSOs at least a year before selling them? 
  2. If so, what was the 409A valuation at the time?

If you answer #1 with no, you’re taxed at ordinary income rates.

If you answer #1 with yes, you get a discount (called long term capital gains). And the lower the 409A valuation was at the time, the higher the tax discount. 

So – assuming you work for a company whose 409A valuation keeps rising – the earlier you exercise your NSOs, the higher your net profit in case of a successful exit.

Here’s how it works:

When you exercise, you’re taxed on your phantom profit (a.k.a. spread) – the difference between the strike price of the NSO, and the 409A valuation at the time.

But if your company goes on to have a successful exit, hopefully you’ll sell your share for an amount higher than that 409A. So your actual profit is more than that initial phantom profit you paid taxes over. 

Your remaining profit now gets taxed, too. 

But at what rates? It depends on when you exercised:

Let’s go through both cases step by step.

If you didn’t exercise at least a year prior: ordinary income rates

This is the worst tax case. 

Your remaining profit is taxed at the same rate as your phantom profit earlier. 

This means, effectively, your full pre-tax profit (the selling price minus the strike price) is taxed at the highest possible rates, and your net profit is the same regardless of whether and when you exercised (or what the 409A valuation was at the time).

Here’s a real-world example

Say you again have these 15,000 NSOs at the $3 strike price. You exercised them when the 409A was $35. After the IPO you can sell them for $150 each. 

However, the IPO was less than a year from when you exercised, so you don’t get the tax discount.

Now the situation is this:

If you sell all of your 15,000 NSOs, then:

If you exercised at least a year prior: long-term capital gains rates

This is the best tax case. 

Your remaining profit is taxed at long-term capital gains rates, which is lower than ordinary income rates. This means your net profit is higher and you maximize your NSO earnings.

And the earlier you exercise, the higher your net profit. 

That’s because exercising earlier means the 409A at the time was lower, so your phantom profit was smaller and your remaining profit larger. 

In other words, a bigger chunk of your gross profit now falls under those favorable long-term capital gains tax rates:

The effective tax rate depends on your personal situation – we’ll use 30% in this article. 

Assuming 30%, this is how the timing of your exercise (and the 409A value at that time) affects your net profit:

Here’s a real-world example

Let’s take the same scenario as before: 

You have 15,000 NSOs at a $3 strike price, you exercised them when the 409A valuation was $35 and now sell them for $150.

Except this time, let’s assume you exercised more than 12 months before your sale, so your remaining profit gets taxed as long-term capital gains. 


The benefit of long-term capital gains rates

In the examples above, getting the long-term capital gains tax rates meant taking home an additional $258,750 after taxes. 

That’s a 21% increase.

Your effective tax rate dropped from 45% to 33% (rather than 30%, because you still paid the higher ordinary income rates over your phantom profit).

This tax savings can make a big difference in practice. See these Snowflake and DoorDash case studies for real-life examples.

How are NSOs taxed when you exercise and sell at the same time (i.e. a cashless exercise)?

Stock options are often explained as:

  1. You first pay money to exercise them, buying you a share
  2. Then, later, you sell that share at a profit (hopefully)

But #1 and #2 can happen at the same time – you buy the share, then immediately sell it. It’s as if you directly sold the NSO (rather than a share).

Of course, you can only do this if you wait until your company exits (otherwise its shares aren’t sellable). 

This is called a cashless exercise, since you never actually have to come up with the cash to cover the exercise costs. 

You immediately make money — the immediate costs are withheld from your proceeds — and you’re guaranteed to have enough cash to cover any taxes later on.

Waiting for an exit to do a cashless exercise is a popular strategy because exercising prior to the exit can be expensive and risky (after all, there’s no guarantee of a successful future exit).

But what does that mean tax-wise?

With a cashless exercise, the two taxable events – exercising and selling – blend into one. This means you don’t get the tax savings of long-term capital gains (after all, you didn’t exercise at least a year prior to selling.)

Instead, you pay the higher ordinary income tax rates over your full profit (i.e. the price you sell your NSOs for, minus their strike price):

Hope that was helpful
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