Share Incentive Plan (SIP) UK 2026: Free Shares, Partnership Shares and Tax Benefits

What is a Share Incentive Plan?

A Share Incentive Plan (SIP) is an all-employee HMRC-approved share scheme. Unlike CSOPs or EMI options, which are discretionary (the company chooses who receives them), a SIP must be offered to all eligible employees on identical terms. You cannot run a SIP for selected staff only.

SIPs were introduced in the Finance Act 2000 and remain the most tax-efficient way for UK employees to acquire shares in their employer company, particularly through salary sacrifice for partnership shares.

The scheme is administered by a UK-resident plan trust, which holds the shares on behalf of employees while they are in the plan. Shares must remain in the trust to benefit from the favourable tax treatment.

The four types of SIP shares

1. Free shares -- up to £3,600/year

The employer awards shares worth up to £3,600 per employee per tax year at no cost to the employee. There is no income tax or NI on the award.

Free shares must be held in the plan for a minimum "holding period" set by the employer (between three and five years). If you leave voluntarily before the end of the holding period, the shares are forfeited.

Tax treatment on removal:

• Held 5+ years: no income tax, no NI.
• Held 3-5 years: income tax on the lower of the market value at award and the market value at removal. No income tax on growth above the original value if removed in this window.
• Held under 3 years (and left voluntarily): forfeited to employer -- no tax issue, no benefit.

Awards can be conditional on performance targets set over a period of up to 18 months, giving employers some flexibility to tie awards to company results.

2. Partnership shares -- up to £1,800/year

You can buy shares in your employer from your pre-tax salary (before income tax and NI are deducted). The annual limit is:

Lower of: £1,800 per year or 10% of your salary

For a basic-rate taxpayer contributing £1,800, the real cost is:

• Income tax saved: 20% of £1,800 = £360.
• Employee NI saved: 8% of £1,800 = £144 (for earnings in the NI band).
• Net cost: approximately £1,296 to buy £1,800 of shares.

For a higher-rate taxpayer:

• Income tax saved: 40% of £1,800 = £720.
• Employee NI saved: 2% of £1,800 = £36.
• Net cost: approximately £1,044 to buy £1,800 of shares.

Contributions can be accumulated over a period of up to 12 months and then used to buy shares, meaning the purchase price can be the lower of the share price at the start of the accumulation period or at the purchase date.

Partnership shares are always returned to you when you leave, regardless of how long you have held them. The income tax treatment on removal is:

• Held 5+ years: no income tax.
• Held 3-5 years: income tax on the lower of the original deduction value and removal market value.
• Held under 3 years: income tax on the lower of original value and removal value.

3. Matching shares -- up to 2:1

The employer can give you matching shares in proportion to the partnership shares you buy. The maximum ratio is 2 matching shares for every 1 partnership share purchased.

Matching shares have the same holding period and forfeiture rules as free shares. If you withdraw your partnership shares early, the related matching shares are also forfeited.

The tax treatment mirrors free shares:

• Held 5+ years: no income tax, no NI.
• Held 3-5 years: income tax on the lower of award value and removal value.
• Held under 3 years (voluntary leaver): forfeited.

4. Dividend shares

If your SIP shares pay dividends, the employer can choose to reinvest those dividends into more shares within the plan, called dividend shares. The dividend reinvestment is free of income tax at the time of reinvestment.

If dividend shares are held in the plan for at least three years, they are removed with no income tax. If removed before three years, income tax applies on the value at reinvestment.

The dividend allowance (£500 in 2026/27) does not apply to dividends reinvested as dividend shares -- the SIP provides its own exemption.

Capital Gains Tax treatment

SIPs provide a unique CGT advantage: while shares are inside the plan trust, no CGT accrues. Growth over many years is entirely sheltered.

When shares are removed from the plan, your CGT base cost is set at the market value on the date of removal. Any growth that occurred while the shares were in the plan does not give rise to a CGT liability.

Example

An employee bought partnership shares at 50p in 2021. By 2026, the share price is £2.00. If the shares are removed from the plan in 2026:

• Income tax: none (held 5+ years).
• CGT base cost: £2.00 (market value at removal).
• CGT on in-plan growth from 50p to £2.00: £0.

If the employee then sells the shares at £2.50 in 2027:

• CGT gain = £2.50 - £2.00 = £0.50 per share.
• After Annual Exempt Amount of £3,000, relatively modest CGT applies.

This step-up in base cost is one of the most valuable features of the SIP.

Worked example: partnership shares plus matching

An employee at a mid-size UK company earns £36,000/year. They decide to contribute the maximum £1,800/year in partnership shares. The employer matches 1:1.

Year 1 purchase:

• Employee contributes £1,800 (from gross pay at 50p per share = 3,600 shares).
• Employer gives 3,600 matching shares (at 50p = £1,800 value).
• Total shares in plan: 7,200.
• Income tax saved: £360 (basic rate). NI saved: approximately £144.
• Net cost of buying £3,600 of shares: approximately £1,296.

Five years later (price now £2.00 per share):

• All 7,200 shares are removed from the plan.
• Value at removal: 7,200 x £2.00 = £14,400.
• Income tax on removal: £0 (held 5+ years).
• CGT base cost: £14,400.

Sold immediately at £2.00:

• CGT gain: £0.
• Total gain received tax-free: £13,104 (£14,400 - £1,296 net cost).

If price rises further to £2.50 before sale:

• CGT gain per share: £0.50.
• Total additional gain: 7,200 x £0.50 = £3,600.
• After Annual Exempt Amount (£3,000): £600 taxable.
• CGT at 18%: £108.

A small amount of CGT on a substantial gain.

What happens when you leave employment

Leaving employment triggers removal of all shares from the plan. The tax treatment depends on how long shares were held and the reason for leaving:

Key point: if you are likely to leave voluntarily within three years, free and matching shares represent a risk. Consider whether accepting them is worthwhile if your employment is uncertain.

US-listed companies and withholding tax

Many large employers are US-listed (or have US parent companies) and operate UK SIPs over US-sited shares. US withholding tax of 30% (reduced to 15% under the UK-US double tax treaty) is typically deducted from dividends before they reach the plan.

This complicates the otherwise clean SIP dividend rules. The withheld tax is technically creditable against UK income tax, but since SIP dividends are income-tax-exempt, there may be no UK tax against which to credit it. Reclaiming US withholding tax on UK SIP dividends can be difficult.

If your company is US-listed, check with your plan administrator how dividends and withholding are handled before making decisions about dividend shares.

SIP vs CSOP vs EMI: a brief comparison

Tax efficiency summary

For a higher-rate taxpayer making full use of partnership shares and receiving a 1:1 match:

• Income tax saved on contributions: £720/year.
• NI saved: approximately £36/year.
• Employer matching shares: £1,800/year of shares received tax-free.
• CGT shelter on in-plan growth: unlimited while in the plan.

Over ten years with a company that grows well, the total tax benefit can be substantial -- easily tens of thousands of pounds for a loyal employee at a successful company.

Sources

• HMRC: Share Incentive Plans
• HMRC: Employment-related securities: approved schemes
• gov.uk: Capital Gains Tax rates and allowances
• MoneyHelper: Share Incentive Plans explained