Trusted Advisor
HomePersonal FinanceStock Options Calculator

Stock Options Calculator

Do you know how much tax you might have to pay on your stock options? Use our free calculator to compare the UK tax outcome on EMI, CSOP and unapproved share options at exercise and disposal - including BADR for qualifying EMI.

As featured in

The Times Money MentorTrustpilot rating
Get In Touch

Your option grant

£
£
£
£
£

Selected: EMI (qualifying)

Gross economic gain

Sale proceeds minus cost to exercise.

£140,000

Income tax at exercise

£0

NI at exercise

£0

CGT on sale

£24,660

Net cash to you

£115,340

Effective tax rate

17.6%

Compare schemes side-by-side

How to use our stock options tax calculator

  1. 1Choose your stock option scheme and enter the number of options and strike price.
  2. 2Add the market value at exercise, expected sale price and your other annual income.
  3. 3See how your stock options could be taxed at exercise and disposal.

Your stock options calculation

The calculator estimates your potential tax outcome based on:

  • Your stock option scheme — EMI, CSOP or unapproved
  • The number of options and strike price
  • The market value when you exercise
  • Your expected sale price
  • Your other annual income
  • Whether your EMI options may qualify for Business Asset Disposal Relief
  • The Capital Gains Tax annual exempt amount

Your result

The calculator shows your gross economic gain, estimated Income Tax and National Insurance at exercise, Capital Gains Tax on sale, net cash and effective tax rate. It also allows you to compare the potential tax outcomes of different stock option schemes.

Our calculator is designed to be the start of a conversation. It provides an estimate based on the information you enter and the assumptions used. If you have a significant stock option award or are considering when to exercise or sell, we’d encourage you to speak to an equity compensation specialist or financial adviser.

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.

Frequently asked questions

The UK has three main share-option scheme types and the tax outcome can differ by tens of percentage points. EMI is the gold standard for qualifying smaller companies — no income tax or NI at exercise (provided strike ≥ grant-date market value) and a reduced Capital Gains Tax rate (18% from 6 April 2026) via Business Asset Disposal Relief if you held the options/shares for at least two years. CSOP allows up to £60,000 of qualifying options per individual with the same income-tax-free exercise treatment but standard Capital Gains Tax on disposal. Unapproved options have no special treatment: the difference between strike and market value at exercise is taxed as employment income, with NI on top. For most UK startup employees the choice is made by the employer — but understanding the relative outcomes helps you negotiate harder on grant size, push for EMI eligibility, and decide when to exercise.

Business Asset Disposal Relief reduces Capital Gains Tax on qualifying disposals to 18% from 6 April 2026 (14% in 2025/26, 10% before 6 April 2025). For EMI shares, the option must have been granted at least 2 years before the sale.

For options granted from 6 April 2026, EMI is available to companies with fewer than 500 employees, gross assets of no more than £120m and a qualifying trade, and the company can have up to £6m of unexercised options. The limit per employee is still £250k, and options can now be exercised up to 15 years after grant.

For EMI shares, the 2-year qualifying period for Business Asset Disposal Relief runs from the date the option was granted, not the date you exercise it. For unapproved options, exercising creates an income tax charge on the difference between the market value and the price you pay, taxed as employment income.

There is no income tax or National Insurance to pay if you buy the shares for at least their market value when the option was granted. If the option was granted at a discount, the discount is taxed at exercise. Capital gains tax may be due when you sell.

For options granted from 6 April 2023, up to £60,000 of options per employee can be exercised without income tax or National Insurance if you exercise between 3 and 10 years after grant. Capital gains tax applies when you sell.

The difference between the market value and the price you pay is taxed as employment income when you exercise, and National Insurance may also be due. Later growth is subject to capital gains tax when you sell.
All calculatorsSpeak to an adviser

Related tools and guides

  • RSU Calculator
  • UK Tax Calculator
  • The Additional-Rate Earner's Guide
  • Find an adviser
Trusted Advisor

FCA-verified UK financial advisers, real client reviews, and a free initial consultation with the adviser of your choice.

Find an adviser

  • All advisers
  • A–Z directory
  • Match me to an adviser

By region

  • London
  • South East
  • South West
  • East of England
  • West Midlands
  • East Midlands
  • North West
  • North East
  • Yorkshire
  • Scotland
  • Wales
  • Northern Ireland

Services

  • Retirement Planning Advice
  • Inheritance Tax Planning
  • Pension Advice
  • Mortgage Advice
  • High Earner Tax Planning
  • Financial Advice for UK Expats

Calculators

  • Retirement calculator
  • Inheritance tax calculator
  • Pensions in estate
  • Buy-to-let vs pension
  • UK tax calculator
  • Pension taper
  • Drawdown calculator
  • Mortgage calculator
  • Buy-to-let returns
  • Life insurance
  • Critical illness

Guides

  • Retirement guide
  • Inheritance guide
  • High earners with children
  • Business owners guide
About usValue of adviceFor advisersBlogPrivacyTerms

Trusted Advisor is a trading name of Coeus Management Ltd, a company registered with Companies House in the United Kingdom (No. 15581278). Trusted Advisor is an introducer service: financial advice is provided by FCA-regulated firms whose details are shown on each adviser profile. Always confirm an adviser's regulatory status on the FCA register before engaging.