The figures below are illustrative. The tax rates are those for 2026/27.
Maya is employee number six at a seed-stage company selling software to businesses. In June 2026 she is granted EMI options over 20,000 shares. HMRC agrees an actual market value of £1.00 a share, and the exercise price is also £1.00, so there is no discount. The unrestricted market value is £1.25 a share, so the grant uses £25,000 of her £250,000 limit. Her salary is £55,000.
Four years later the company is sold at £9.00 a share. Maya exercises and sells: proceeds £180,000, cost £20,000, so a gain of £160,000.
With EMI
- There is no tax when the option is granted, and none when it is exercised, because the exercise price was at least the agreed market value at the date of grant.
- The whole £160,000 is a capital gain. The annual exempt amount is £3,000, leaving £157,000.
- Business Asset Disposal Relief applies, because the options were granted more than two years before the sale and she was an employee throughout. EMI shares do not have to meet the usual requirement to hold at least 5% of the company.
- The relief gives a rate of 18% for disposals on or after 6 April 2026, up to a £1 million lifetime limit. Tax: £157,000 × 18% = £28,260.
Without EMI: the same options, unapproved
- At exercise, the £160,000 difference between market value and what she paid is employment income. Shares in a company that is being sold can be turned into cash straight away (they are readily convertible assets), so the income goes through payroll with PAYE and National Insurance.
- Added to her £55,000 salary, the £160,000 is taxed partly at 40% and mostly at 45%, and she loses her personal allowance. The extra income tax is £73,521.
- Employee National Insurance at 2% on £160,000 adds £3,200. Total: £76,721.
- Employer's National Insurance at 15% is another £24,000. Unapproved option agreements commonly pass this to the option holder through a joint election, and if it is passed to her, Maya's bill is £100,721.
- There is then no capital gain on the immediate sale, because the £160,000 taxed as income is added to her base cost, making it £180,000.
On the same shares and the same sale, Maya pays £28,260 with EMI and £76,721 without it. If the employer's National Insurance has been passed to her, she pays £100,721 without EMI, which is £72,461 more than with it.
The company gets the same corporation tax deduction in both cases, equal to the employee's gain at exercise of £160,000, which is worth £40,000 at the 25% main rate.