Do you know how much tax you will pay on your stock options?
If your employer gives you stock options, understanding how much they could be worth after tax can be complicated. The tax treatment can depend on the type of stock option scheme, the price you pay to exercise the options and the value of the stock when you exercise or sell.
Our free UK Stock Options Tax Calculator helps you estimate the potential tax on Enterprise Management Incentives (EMI), Company Share Option Plans (CSOP), and unapproved stock options. You can enter your number of options, exercise price, market value at exercise, expected sale price and other income to see how the different schemes could affect your outcome.
This can help you answer an important question: how much could I actually receive from my stock options after tax?
The result is an illustration rather than a guarantee. The actual tax treatment will depend on the terms of your stock option scheme and your personal circumstances.
What are stock options?
Stock options give you the right to buy stock in a company at a specified price, usually within a particular period and subject to certain conditions.
Stock options are commonly used by employers as part of employee remuneration. They can be offered through tax-advantaged schemes such as EMI and CSOP, or as unapproved stock options.
The tax treatment can be very different depending on which type of stock option you have.
How are stock options taxed in the UK?
For many stock options, the key tax point is when you exercise the option. With an unapproved stock option, the difference between the market value of the stock when you exercise and the amount you pay for it can generally be subject to Income Tax. National Insurance may also apply.
If you keep the stock after exercising your options and later sell it for more than its relevant acquisition cost, there may also be Capital Gains Tax to consider.
Tax-advantaged stock option schemes such as EMI and CSOP have different rules and can provide tax benefits if their conditions are met.
What happens when I exercise my stock options?
Exercising a stock option means using your right to buy stock at the agreed exercise or strike price.
For example, if you have 10,000 stock options with a £2 exercise price and the stock is worth £10 when you exercise, you would pay £20,000 to acquire stock worth £100,000. The £80,000 difference is the economic gain before tax.
For an unapproved stock option, this difference can generally form part of your employment income.
The tax treatment can be different for EMI and CSOP options, depending on whether the relevant conditions are met.
What happens when I sell the stock?
If you keep the stock after exercising your options and its value increases, you may have to pay Capital Gains Tax when you eventually sell it.
The calculation generally takes into account the amount you paid to acquire the stock and any amount already subject to Income Tax when the stock option was exercised.
This means it is important to consider both the tax when you exercise your stock options and the potential Capital Gains Tax when you sell.
When should I exercise my stock options?
The timing of exercise can be important because it can affect both the amount you need to pay to acquire the stock and the tax you may owe.
For an unapproved stock option, exercising when the market value is substantially above the exercise price can create a significant Income Tax liability.
With tax-advantaged stock options, the timing can also affect whether the conditions for favourable tax treatment are met.
There can also be practical considerations, such as how long you expect to remain with the company, whether there is a planned sale or listing, how much cash you need to exercise the options and how much of your wealth is tied to your employer.
The calculator can help you understand the potential numbers before making a decision.
Should I speak to a financial adviser about my stock options?
A stock options calculator can help you understand the potential tax and proceeds from your stock options, but it cannot account for every aspect of your circumstances.
A regulated financial adviser can help you consider how your stock options fit alongside your salary, pension, investments and wider financial plans. A tax adviser may also be able to help with the tax treatment of your particular stock option scheme, especially where you have complex or international circumstances.
Before deciding when to exercise or sell your stock options, it can be useful to consider not just the potential tax, but also the investment risk, amount of capital you are committing and how much of your wealth is tied to your employer.
If you would like help assessing your options, you can use the Trusted Advisor adviser matching service to find a regulated financial adviser suited to your needs. Alternatively, email our team at hello@trusted-advisor.co.uk and we can help you understand the next steps.

