UK EMI Stock Options 2026 — CGT vs Income Tax & How to Optimise

You're granted 5,000 share options (EMI, Enterprise Management Incentive) at £2/share (grant price), with a fair value of £2.50 at grant date. You exercise after 3 years when shares are worth £5. Do you pay income tax (on £2.50 gain per share = £12,500 income tax at 40% = £5,000 tax) or capital gains tax (on £3 gain per share = £15,000 CGT at 20% = £3,000 tax)? The answer is: it depends on the scheme design and your exit timing. We'll walk through EMI taxation and show how to minimize tax via careful timing.

UK Employee Share Schemes: The Options

| Scheme | Grant Price | Tax on Exercise | Tax on Sale | Lifetime Limit | Ideal For | |---|---|---|---|---| | EMI | Market value | None (if conditions met) | CGT (20/24%) | £250k | Early-stage companies | | CSOP (SAYE) | Up to 20% discount | None | CGT | £30k | Large companies | | SIP (Share Incentive Plan) | Can be discounted | None | None (if held 5 yrs) | Various | Any company | | Restricted shares/RSUs | Market value | Income tax (on vesting value) | CGT | No limit | Tech startups |

EMI is most common for private/early-stage tech companies. CSOP is used by larger public companies.

Real-World EMI Scenario: Startup Founder

Meet James, 35, granted 10,000 EMI options at £1/share grant price:

Year 0 (grant):

• Grant price: £1/share
• Fair value at grant: £1 (no gain, no tax)
• EMI conditions: Must hold 3 years, exercise after year 3

Year 3 (exercise eligibility):

• Fair value now: £3/share
• Exercise: £1/share (grant price)
• Gain: £2/share × 10,000 = £20,000
• Tax on exercise (EMI): £0 (EMI relief applies)
• James exercises, owns 10,000 shares worth £30,000

Year 4 (sale):

• Share price: £5/share
• Proceeds from sale: £5 × 10,000 = £50,000
• Acquisition cost (basis): £1/share × 10,000 = £10,000 (original exercise price)
• Capital gain: £50,000 − £10,000 = £40,000
• CGT (20%): £8,000 (less than £3,000 if CGT allowance used)
• Net proceeds: £42,000

Tax-efficient outcome:

• No tax at exercise (EMI relief)
• CGT only at sale (20% vs 40% income tax)
• Total tax: £8,000 (16% of gain)

Compare to non-EMI RSUs:

• If the same scheme was RSUs (not EMI), vesting at year 3:
• Income tax at vesting: 40% × £20,000 = £8,000
• CGT at sale: 20% × £20,000 = £4,000
• Total tax: £12,000 (worse by £4,000)

The EMI Advantage: Tax-Free Exercise

EMI's magic: no income tax on exercise (if conditions are met):

• Grant price must be fair market value (or lower)
• Company must qualify (turnover <£30m, etc.)
• Options exercised between years 3–10 of grant
• Exercise price must equal fair value at grant date (no free options)

If these conditions are met:

• Exercise is tax-free
• Only CGT applies on later sale (20/24%, not 40% income tax)
• Effective tax rate on gains: 20–24% (vs 40% for RSUs)

This saves 16–20% in tax per share exercised. On a £100,000 gain, that's £16,000–£20,000 saved.

Timing Strategy 1: Exercise + Sell in Different Tax Years

If James exercises 10,000 shares in late March 2026 and sells in April 2026:

Tax year 2025/26 (exercise):

• Exercise: £0 tax (EMI relief)
• CGT: £0 (no sale yet)

Tax year 2026/27 (sale):

• Sale: £40,000 capital gain
• CGT allowance (2026/27): £3,000
• Taxable gain: £37,000
• CGT (20%): £7,400
• Net tax: £7,400

If James exercised and sold in the same tax year (Jan–March 2026):

• Sale proceeds would count in the same year
• CGT allowance would apply to the full £40,000 gain
• Same final tax: £7,400

No timing advantage here if exercised/sold quickly. But if exercised in March 2026, he could delay sale to April 2026 to use a fresh CGT allowance.

Timing Strategy 2: Holding for CGT Taper Relief (Abolished)

Important note: CGT taper relief (discount for holding >1 year) was abolished in 2008. Holding 10 years vs 1 year doesn't give tax relief anymore. Don't rely on this.

Timing Strategy 3: Sell During Low-Income Year

If James takes a sabbatical (low income year) while holding shares:

Normal year (£80k salary):

• Salary: £80,000
• Tax: £32,000 (40%)
• Used basic-rate allowance: £0 (he's a higher-rate taxpayer)
• CGT on £40k gain: 20% = £8,000
• Total tax: £8,000

Sabbatical year (£20k income):

• Salary: £20,000
• Tax: £0 (below personal allowance?)... actually wrong; higher-rate taxpayers don't get allowance at £80k.

Let me recalculate:

Normal year (£80k salary, higher-rate taxpayer):

• CGT on £40k: 20% = £8,000

Low-income year (£20k from freelance, basic-rate):

• Salary: £20,000
• Tax: 20% (basic rate still applies)
• CGT on £40k: Still 20% (CGT rate doesn't drop)
• Same CGT: £8,000

CGT rate doesn't depend on income level (20/24% flat rate). So timing a sale during low income doesn't save CGT; it only helps with income tax and NI.

Timing Strategy 4: Spread Sale Across Tax Years

If James sells 5,000 shares in March 2026 (gain £20,000) and 5,000 in April 2026 (gain £20,000):

Year 2025/26:

• Gain: £20,000
• CGT allowance: £3,000
• Taxable: £17,000 × 20% = £3,400

Year 2026/27:

• Gain: £20,000
• CGT allowance: £3,000
• Taxable: £17,000 × 20% = £3,400
• Total CGT: £6,800 (vs £7,400 if sold in one year)

Saving: £600 (by splitting across two tax years and using two annual allowances).

This is useful for very large gains (>£6,000).

Married Couples: Transfer Allowances

If James is married, he can transfer shares to his spouse before sale:

Example:

• James owns 10,000 shares, planning to sell all
• He transfers 5,000 to spouse (gift, no tax)
• Both sell simultaneously:
  • James: 5,000 shares, £20,000 gain, CGT allowance £3,000, tax £3,400
  • Spouse: 5,000 shares, £20,000 gain, CGT allowance £3,000, tax £3,400
• Total: £6,800 (vs £8,000 if he sold alone)

Requirement: Spouse must have lower/no other capital gains to make full use of their allowance.

Company Share Options: Not All EMI

CSOP (Company Share Option Plan):

• Often offered by larger companies
• Tax treatment: No income tax on exercise (if conditions met); CGT on sale
• Similar to EMI but capped at £30,000 exercise price (EMI has £250k limit)

SIP (Share Incentive Plan):

• Employees buy shares, employer matches 2:1 (e.g., buy 1, get 2 free)
• Tax: Dividend tax-free on SIP shares; gains tax-free if held 5 years
• This is the most tax-efficient scheme (better than EMI)

Restricted Stock Units (RSUs) / Performance Shares:

• Taxed on vesting (income tax on vesting value)
• No EMI relief
• 40% income tax + 20% CGT on sale
• Worst tax treatment

Most tech startups use EMI or RSUs. Check your grant letter to confirm which scheme.

Cash Bonus vs Share Options

If James could take a cash bonus of £20,000 instead of the £20,000 EMI gain:

Bonus:

• Income tax (40%): £8,000
• NI (2%): £400
• Net: £11,600

EMI gain:

• Exercise tax: £0
• Sale CGT: £4,000 (20%)
• Net: £16,000

EMI is better by £4,400 (options deliver 38% more after-tax value than cash).

This is why early-stage companies offer options instead of high salaries; the tax advantage is huge.

Pitfalls: When EMI Tax Breaks Don't Apply

If conditions aren't met:

• Grant price > fair market value at grant (rare, but possible in a down round)
• Company doesn't qualify (turnover >£30m)
• Options exercised <3 years or >10 years after grant
• Non-qualifying options (some schemes issue both qualifying and non-qualifying)

If EMI relief doesn't apply, exercise is taxed as income. On a £20,000 gain:

• Income tax (40%): £8,000
• NI (2%): £400
• Total: £8,400
• Then CGT on later sale (20%): another £4,000 potentially
• Total tax: £12,400 (vs £4,000 with EMI relief)

This is why it's critical to confirm your options are EMI-qualifying before exercising.

Final Checklist: Optimizing EMI Tax

• Confirm options are EMI-qualified (check grant letter)
• Don't exercise before 3-year vesting
• Exercise within 3–10 years of grant (outside this window, EMI relief is lost)
• If possible, split sale across two tax years (to use two CGT allowances)
• If married, consider transferring to spouse if they have unused allowances
• Don't hold expecting "taper relief" (abolished; doesn't apply)
• Consider low-income year timing if possible (not for CGT, but helps with ancillary tax)
• Beware of cashless exercise (broker fees can be significant; avoid if possible)

Next step: Use the Stock Option Tax calculator with your grant price, current share price, and planned sale date. Most UK tech employees with EMI options save £8,000–£20,000 in taxes by understanding the relief and timing carefully.