Growth Shares UK: Equity Compensation Beyond EMI for Tech Startups (2026)

For UK tech startup founders looking to attract and retain exceptional talent, equity compensation extends far beyond Enterprise Management Incentive (EMI) options. Growth shares, restricted stock, performance vesting, and phantom equity each offer distinct advantages depending on company stage, employee seniority, and strategic objectives. 

 

Understanding which mechanism suits specific situations – and the substantial tax implications of getting it wrong – can save companies and employees hundreds of thousands of pounds whilst building stronger alignment between team and shareholders. 

 

This comprehensive guide explores equity compensation structures beyond standard EMI options, covering growth shares and hurdle shares for senior hires, restricted stock arrangements and tax elections, performance-based vesting structures, phantom equity and cash-settled alternatives, tax treatment comparison across all structures, and designing optimal equity packages for different roles and stages. 

Why Look Beyond EMI Options? 

EMI options represent the gold standard for UK startup equity compensation, offering no income tax on exercise and CGT at BADR rates (14% for 2025/26, 18% from April 2026) on disposal. However, EMI has significant limitations, creating gaps that alternative structures fill. 

EMI Limitations 

Company qualifying conditions: Gross assets under £30M, fewer than 250 employees, trading company carrying on qualifying trade. Companies approaching or exceeding these thresholds lose EMI eligibility entirely. 

Individual limits: Maximum £250,000 per employee (unrestricted market value of shares at grant). Senior hires expecting larger equity packages require supplementary arrangements. 

Excluded activities: Financial services, property development, legal services, and certain other trades don’t qualify for EMI regardless of size. 

Non-UK employees: EMI is only available to employees spending 25%+ working time in the UK. International team members need alternative structures.

EMI Limitation	Impact	Alternative Solution
£250K individual cap	Senior hires need more equity	Growth shares, unapproved options
£30M asset cap	Growing companies lose eligibility	CSOP, growth shares, phantom equity
250 employee limit	Scaling companies excluded	CSOP, unapproved options
UK working time	International employees excluded	Phantom equity, local schemes
Excluded trades	Financial services, property	CSOP, growth shares

 

Growth Shares: Tax-Efficient Equity for Senior Hires 

Growth shares represent a separate class of shares with negligible current value but full participation in future value growth above a predetermined hurdle, creating tax-efficient equity awards without the limitations of option schemes. 

How Growth Shares Work 

 

Mechanics: The company creates a new share class (typically “B Ordinary” or “Growth Shares”) with rights to participate in company value only above a specified hurdle amount. Employee purchases shares at current market value (which is negligible because all current value sits below the hurdle). 

 

Example: 

Company current valuation: £10M Growth share hurdle: £10M (set at current value) Growth shares issued: 5% of equity Purchase price: Nominal (£100-£500 typically, reflecting negligible value above hurdle) 

 

At exit (£50M): 

• Value above hurdle: £50M – £10M = £40M 

• Growth share participation: 5% × £40M = £2M 

• Employee cost: £500 

• Employee gain: £1,999,500 

 

Tax treatment: 

• No income tax at grant (shares purchased at market value) 

• No income tax during holding period 

• CGT on disposal: £1,999,500 × 14% (BADR) = £279,930 

• Effective tax rate: 14% 

 

Compare with unapproved option on same gain: 

• Income tax on exercise: £1,999,500 × 45% = £899,775 

• Employee NIC: £1,999,500 × 2% = £39,990 

• Employer NIC: £1,999,500 × 13.8% = £275,931 

• Total tax burden: £1,215,696 (60.8% effective rate) 

 

Growth share advantage: £935,766 tax saving on £2M gain. 

 

Setting the Hurdle 

 

Hurdle valuation represents the critical element determining growth share value and tax treatment. Set too low, HMRC may argue shares have significant current value triggering income tax. Set too high, employees receive insufficient reward. 

 

Hurdle approaches: 

Approach	Hurdle Level	Risk	Suitability
Current FMV	£10M (if current value)	Low HMRC risk	Standard approach
Premium to FMV	£12M-£15M (20-50% premium)	Very low risk	Conservative, less employee reward
Ratchet	Increases annually	Low risk	Long-term incentive
Below FMV	£8M	High risk – income tax on discount	Avoid

 

Best practice: Commission an independent valuation establishing a hurdle at or slightly above current fair market value. Cost: £3K-£8K for valuation, £5K-£15K for legal documentation. 

 

HMRC clearance: Unlike EMI, no formal HMRC advance assurance process exists for growth shares. However, obtaining professional valuation provides strong defence if HMRC challenges. 

Growth Share Rights and Restrictions 

Typical rights structure: 

 

Dividend rights: Growth shares typically carry no dividend rights (or reduced dividends), with all current dividend value sitting with ordinary shares. This supports the negligible current value argument. 

 

Voting rights: Usually no voting rights, further supporting low valuation. 

 

Exit participation: Full participation above hurdle on exit event (trade sale, IPO, or specified liquidity event). 

 

Drag and tag rights: Growth shares typically subject to drag-along (forced sale if majority sells) and tag-along (right to sell alongside majority) on same terms as ordinary shares above hurdle. 

Leaver provisions: 

Leaver Type	Treatment	Typical Terms
Good leaver (redundancy, illness, retirement)	FMV or formula price	Retains vested growth shares
Bad leaver (resignation within cliff period)	Nominal value or forfeiture	Company repurchases at cost
Gross misconduct	Forfeiture at nominal	Immediate loss

 

Growth Shares vs EMI Options 

Feature	Growth Shares	EMI Options
Tax on grant/exercise	None (if properly structured)	None
Tax on disposal	CGT 14-24%	CGT 14-24%
Individual limit	None	£250K unrestricted market value
Company qualifying	Any trading company	<£30M assets, <250 employees
HMRC clearance	Not available	Available (recommended)
Setup cost	£8K-£20K	£5K-£15K
Complexity	Higher (share class creation, valuation)	Lower (standard scheme)
Employee risk	Pays nominal purchase price	No cost until exercise

 

When to use growth shares instead of EMI: 

 

• Senior hire needing >£250K equity value 

• Company approaching EMI qualifying limits 

• Excluded trade (financial services, property) 

• Desire for immediate ownership (rather than option to purchase later) 

• Supplementing EMI grants for key individuals 

Restricted Stock: Immediate Ownership with Conditions 

 

Restricted stock involves issuing actual shares to employees subject to forfeiture conditions (typically time-based vesting), with employees becoming immediate shareholders with voting and dividend rights. 

How Restricted Stock Works 

 

Grant mechanism: Company issues shares to employees at current market value (or below, with tax consequences). Shares are subject to forfeiture if employment ends before vesting conditions are satisfied. 

 

Vesting schedule: Typically 3-4 years with a 1-year cliff, identical structure to option vesting but applied to actual share ownership. 

 

Tax treatment without Section 431 election: 

Without election, income tax is charged when restrictions lift (vesting), based on market value at vesting minus amount paid. This creates uncertainty – if company value increases significantly during vesting, the income tax bill grows proportionally. 

 

Example without election: 

Shares acquired at £1 per share (1,000 shares = £1,000) Value at vesting (3 years later): £50 per share Income tax on vesting: (£50 – £1) × 1,000 = £49,000 × 45% = £22,050 Plus NIC: £49,000 × 2% = £980 Plus employer NIC: £49,000 × 13.8% = £6,762 

Total tax at vesting: £29,792 (61% effective rate on gain) 

Section 431 Election: The Critical Tax Decision 

Section 431 ITEPA 2003 allows employee and employer to jointly elect for income tax to be charged at grant (on unrestricted market value minus amount paid) rather than at vesting. 

 

Why this matters: 

If shares acquired at market value AND Section 431 election filed: 

• Income tax at grant: £0 (market value = purchase price) 

• All future growth taxed as CGT on disposal: 14-24% 

• Effective saving: 35-45 percentage points on entire growth 

 

Filing requirement: Election must be filed within 14 days of share acquisition. Missing this deadline is irrevocable – there is no extension or appeal mechanism. 

 

Example with Section 431 election: 

Shares acquired at £1 per share (1,000 shares = £1,000) – equal to market value Section 431 election filed within 14 days Value at eventual sale: £50 per share 

 

CGT on sale: (£50 – £1) × 1,000 = £49,000 × 14% (BADR) = £6,860 

 

Comparison: 

• Without election: £29,792 tax (61% effective) 

• With election: £6,860 tax (14% effective) 

• Saving: £22,932 on £49,000 gain 

 

Restricted Stock vs Growth Shares vs EMI 

Feature	Restricted Stock	Growth Shares	EMI Options
Ownership	Immediate (subject to forfeiture)	Immediate	On exercise only
Voting rights	Yes (typically)	Usually no	No (until exercise)
Dividends	Yes	Usually no	No (until exercise)
Purchase price	Market value	Nominal	Exercise price (market value)
Cash outlay	Significant (market value)	Minimal	Deferred to exercise
Section 431 required	Yes (critical)	Yes (recommended)	No
Best for	Co-founders, very early stage	Senior hires, supplementing EMI	Most employees

Performance Vesting: Aligning Equity with Business Outcomes 

 

Performance-based vesting conditions tie equity awards to specific business milestones rather than (or in addition to) time-based service, creating stronger alignment between equity rewards and value creation. 

 

Common Performance Metrics 

Revenue milestones: 

Tranche	ARR Target	Vesting	Rationale
Tranche 1	£2M ARR	25%	Proven product-market fit
Tranche 2	£5M ARR	25%	Demonstrated scalability
Tranche 3	£10M ARR	25%	Growth trajectory confirmed
Tranche 4	£20M ARR	25%	Scale achieved

 

Profitability targets: 

Tranche 1: Break-even achieved (25% vesting) Tranche 2: 10% EBITDA margin (25% vesting) Tranche 3: 20% EBITDA margin (25% vesting) Tranche 4: Sustained profitability for 4 consecutive quarters (25% vesting) 

 

Customer/product metrics: 

Net revenue retention exceeding 110% Customer count reaching specified thresholds Product launch milestones achieved Market expansion into new geographies 

 

Fundraising milestones: 

Series A completion: 25% vesting Series B completion: 25% vesting Exit event (trade sale or IPO): 50% vesting 

 

Hybrid Vesting Structures 

Time + performance combination (recommended): 

50% time-based: Standard 4-year vesting with 1-year cliff 50% performance-based: Tied to specific milestones 

 

Why hybrid works best: 

Pure time vesting rewards tenure without performance accountability. Pure performance vesting creates uncertainty and potential unfairness (external factors affect milestones). Hybrid ensures base reward for service plus upside for exceptional performance. 

 

Example hybrid structure for CTO: 

Total grant: 50,000 options (2% equity) Time-based (25,000 options): 4-year monthly vesting, 1-year cliff 

 

Performance-based (25,000 options): 

• 8,333 options vest when product achieves 99.9% uptime for 6 months 

• 8,333 options vest when engineering team scales to 25 people 

• 8,334 options vest when platform processes 1M transactions monthly

 

Tax Implications of Performance Conditions 

EMI options with performance conditions: Performance conditions don’t affect EMI tax treatment provided scheme properly structured. No income tax on exercise, CGT on disposal. 

 

Growth shares with performance conditions: Performance hurdles can be built into share terms without affecting tax treatment, provided shares acquired at market value reflecting conditions. 

 

Key risk: If performance conditions are considered “further restrictions” on shares, they may affect valuation and tax treatment. Professional advice essential when combining performance vesting with growth shares or restricted stock. 

 

Phantom Equity and Cash-Settled Alternatives 

Phantom equity provides economic exposure to company value growth without issuing actual shares, settling in cash rather than equity on trigger events. 

 

How Phantom Equity Works 

Mechanics: Company grants contractual right to cash payment equal to value appreciation of specified number of notional shares, payable on exit event or specified trigger. 

 

Example: 

Phantom equity grant: Equivalent to 1% of company Base value at grant: £10M (phantom value: £100,000) Exit value: £50M (phantom value: £500,000) Cash payment: £500,000 – £100,000 = £400,000 

 

Tax treatment: Cash payment treated as employment income: 

• Income tax: Up to 45% 

• Employee NIC: 2% 

• Employer NIC: 13.8% 

• Total tax burden: ~61% on gain 

 

When Phantom Equity Makes Sense 

Despite unfavourable tax treatment, phantom equity serves specific purposes. 

Scenario	Why Phantom Works	Tax Disadvantage Acceptable?
International employees	No share scheme compliance in employee’s jurisdiction	Yes – simplicity outweighs tax
Avoiding dilution	No actual shares issued	Yes – if dilution is critical concern
Non-qualifying companies	Excluded from EMI, complex structure	Maybe – consider growth shares first
Short-term incentive	1-2 year retention bonus linked to value	Yes – small amounts, short duration
Contractor incentives	Can’t issue employee share schemes	Yes – only option for non-employees

 

Structuring considerations: 

National Insurance planning: Employer NIC (13.8%) on phantom equity payments can be substantial. On £400K payment: £55,200 employer NIC. Consider whether NIC transfer agreement (passing employer NIC to employee) is appropriate – reduces employer cost but increases employee burden. 

 

Timing of payment: Structuring phantom equity to pay on exit (rather than vesting) defers both payment and tax, aligning incentive with actual liquidity event. 

 

Cap and floor provisions: Setting maximum payout prevents unexpected liability for the company. Setting a minimum ensures the employee receives meaningful reward. 

 

Stock Appreciation Rights (SARs) 

 

SARs function similarly to phantom equity but specifically reference share price appreciation rather than company value. 

 

Difference from phantom equity: 

 

Phantom equity: Tracks company value (may include different metrics) SARs: Tracks specific share price from grant to exercise/trigger 

 

Tax treatment: Identical to phantom equity – employment income subject to income tax and NIC. 

 

When SARs are preferred over phantom equity: 

• Simpler calculation (share price vs company valuation) 

• More familiar structure for US-connected companies 

• Clearer employee communication about value 

 

Designing Optimal Equity Packages by Role 

 

Different roles require different equity structures balancing tax efficiency, alignment, and practical considerations. 

 

C-Suite / Co-Founder 

 

Recommended structure: 

Component	Allocation	Structure	Rationale
Core equity	3-10%	Ordinary shares (founder) or growth shares	Maximum alignment, tax-efficient
EMI top-up	Up to £250K value	EMI options	Tax-efficient additional upside
Performance bonus	0.5-2%	Performance-vesting growth shares	Milestone alignment

 

Tax optimisation: Growth shares + EMI combination allows >£250K equity participation at CGT rates rather than income tax rates. 

 

VP / Director Level 

 

Recommended structure: 

Component	Allocation	Structure	Rationale
Primary equity	0.25-1%	EMI options	Standard, tax-efficient
Supplementary	0.1-0.5%	Growth shares (if EMI cap reached)	Additional incentive
Retention	Accelerated vesting terms	Built into option/share terms	Retention during critical periods

Senior Engineer / Manager 

 

Recommended structure: 

Component	Allocation	Structure	Rationale
Standard equity	0.05-0.25%	EMI options	Tax-efficient, simple
Performance upside	0.02-0.1%	Performance-vesting EMI	Milestone alignment

International Team Members 

Recommended structure: 

Component	Allocation	Structure	Rationale
Primary incentive	0.05-0.5%	Phantom equity or local scheme	Compliance, simplicity
Supplementary	Cash bonus	Retention bonus	Bridging tax disadvantage

 

Important consideration: Phantom equity tax disadvantage (61% vs 14-18%) means international employees receive substantially less after-tax value per percentage point of equity. Consider larger nominal grants or supplementary cash to compensate. 

 

Implementation Costs and Professional Fees 

 

Setup Costs by Structure 

Structure	Legal Fees	Valuation	HMRC Process	Total Setup	Ongoing Annual
EMI scheme	£5K-£15K	£3K-£8K	4-8 weeks clearance	£8K-£23K	£2K-£5K
Growth shares	£8K-£20K	£5K-£12K	No formal clearance	£13K-£32K	£3K-£8K
Restricted stock	£5K-£12K	£3K-£8K	Section 431 filing	£8K-£20K	£2K-£5K
Phantom equity	£3K-£8K	£2K-£5K	None	£5K-£13K	£1K-£3K
Combined scheme	£15K-£35K	£5K-£12K	Various	£20K-£47K	£5K-£12K

Ongoing Administration 

Annual requirements: 

EMI: Annual return to HMRC (form 40), option register maintenance, valuation updates for new grants. Growth shares: Share register maintenance, valuation updates, leaver processing. Restricted stock: Section 431 elections for new grants, employment tax reporting. Phantom equity: Liability tracking, valuation updates, payment processing 

 

Administration platforms: Carta, Vestd, and SeedLegals provide automated administration for £200-£500 monthly depending on scheme complexity and number of participants. 

Conclusion: Building a Comprehensive Equity Strategy 

 

Effective equity compensation extends well beyond standard EMI options, with growth shares, restricted stock, performance vesting, and phantom equity each serving specific strategic purposes. The most successful UK tech startups design comprehensive equity strategies combining multiple structures to optimise tax efficiency, alignment, and practicality across different employee categories. 

 

The key principles for effective equity compensation design include using EMI options as the primary structure for UK employees (maximum tax efficiency at lowest complexity), supplementing with growth shares for senior hires exceeding £250K EMI cap or companies approaching qualifying limits, implementing performance vesting to align equity rewards with measurable business outcomes, using phantom equity selectively for international employees or specific situations where share issuance is impractical, and filing Section 431 elections within 14 days for all restricted stock (missing this deadline is irrecoverable). 

 

Poor equity compensation design creates substantial risks, including unnecessary tax burdens converting 14% CGT to 61% income tax treatment, employee dissatisfaction when tax outcomes differ from expectations, HMRC challenges on improperly structured growth shares or valuations, and retention failures when equity packages don’t compete with market alternatives. 

 

For UK tech startups, investing in professional equity compensation design (£15K-£50K for a comprehensive scheme covering multiple structures) generates returns through improved recruitment outcomes, stronger retention, better alignment, and substantial tax savings for both company and employees. 

 

This blog post is intended as general guidance only and does not constitute tax or legal advice. Equity compensation involves complex tax implications and regulatory requirements. You should always consult with qualified tax advisers and employment lawyers before implementing equity compensation structures.

FAQ

Q: What are growth shares in the UK?
A: Growth shares are a tax-advantaged employee share scheme for UK-based companies that do not need HMRC approval. They give employees a separate class of shares with rights to participate in company value only above a predetermined hurdle price, meaning the shares have negligible current value at grant but full participation in future growth.

Q: How are growth shares taxed in the UK?
A: When properly structured with a hurdle set at current fair market value, growth shares attract no income tax at grant, no income tax during the holding period, and capital gains tax at 14–18% with BADR on disposal. This compares favourably to unapproved options where the same gain could be taxed at up to 61% including income tax and National Insurance.

Q: What is the difference between growth shares and EMI options in the UK?
A: Both growth shares and EMI options are significantly more tax-efficient than unapproved employee share schemes, with proceeds taxed as capital gains rather than income. The key difference is that EMI options have a £250,000 individual cap and company qualifying limits, whereas growth shares have no individual limit and are available to any trading company regardless of size.

Q: What is a Section 431 election and why does it matter for restricted stock?
A: A Section 431 ITEPA 2003 election allows an employee and employer to jointly elect for income tax to be charged at the point of grant rather than at vesting. If shares are acquired at market value and the election is filed within 14 days, all future growth is taxed as capital gains at 14–18% rather than income tax at up to 45%. Missing the 14-day deadline is irrevocable, with no appeal mechanism.

Q: When should a UK startup use phantom equity instead of growth shares?
A: Phantom equity works best for international employees where issuing actual shares creates compliance complexity in the employee’s jurisdiction, for contractors who cannot participate in employee share schemes, or when the company wants to avoid actual share dilution. Despite its less favourable tax treatment of up to 61%, phantom equity’s simplicity makes it the practical choice in these specific situations.

Q: How much does it cost to set up a growth share scheme in the UK?
A: Setting up a growth share scheme in the UK typically costs £8,000–£20,000 in legal fees plus £5,000–£12,000 for an independent valuation establishing the hurdle, totalling £13,000–£32,000. Ongoing annual administration costs typically £3,000–£8,000 including share register maintenance, valuation updates, and leaver processing.