Understanding Employee Share Schemes: RSUs and ESPPs

Reviewed by Neil AinsworthLast updated: April 8, 2026 12:31 pm

Image credit: EqualStock IN @Pexels

Employee share schemes such as Restricted Stock Units¹ (RSUs) and Employee Stock Purchase Plans² (ESPPs) give staff a direct stake in their employer’s performance. Used well, they can support retention and align incentives, but they also introduce specific risks and tax considerations. This guide explains how RSUs and ESPPs typically work, their potential benefits, and the main points to weigh up before taking part.

What are Restricted Stock Units (RSUs)?

Restricted Stock Units (RSUs) are a common form of equity pay. An employer promises to deliver a set number of shares if vesting conditions are met, usually continued employment and, in some cases, performance targets. There is normally no upfront cost to the employee and no shareholder rights until vesting.

Key Features of RSUs

• Vesting Period: The vesting schedule sets how and when you become entitled to the shares. It often runs over one to four years and may be “cliff” (all at once) or “graded” (in stages).
• Taxation: In the UK, when RSUs vest and shares are delivered, the value is treated as employment income and is usually subject to Income Tax³ and employee National Insurance contributions⁴ via PAYE. Employers commonly sell or withhold some shares to meet withholding obligations. No Capital Gains Tax⁵ (CGT) arises at vesting; your CGT base cost is the amount taxed at vesting.
• Sale of Shares: After the shares have vested, you can sell or hold them, subject to any company dealing restrictions (such as blackout periods and insider dealing rules). A later sale may give rise to a CGT gain or loss based on the difference between the sale proceeds and your base cost. Rates and allowances can change, so check the current HMRC guidance.

Benefits of RSUs

RSUs allow employees to share in the company’s growth without committing personal funds upfront, helping align employees’ interests with shareholders’. However, share prices can fall as well as rise, and the eventual value you receive will depend on future share performance and the taxes due.

Additional Considerations

Plan ahead for tax at vesting. In the UK, the value of vested shares is normally subject to Income Tax and employee National Insurance via PAYE. Employers often sell or withhold some shares to cover this, but the amount withheld may not always match your final liability, so ensure you have sufficient liquidity.

Read your plan documentation carefully. Vesting schedules, leaver provisions, performance hurdles, treatment on corporate events, dividend or dividend‑equivalent rights, and any agreement to transfer employer NICs can vary by employer and award. Cross‑border working can also change the tax position, so seek guidance if you have worked in more than one country during the vesting period.

What is an Employee Stock Purchase Plan (ESPP)?

An Employee Stock Purchase Plan (ESPP) enables employees to acquire company shares at a discount through payroll deductions over a set offering period. At the end of the period, the accumulated contributions are used to buy shares, typically at a discounted price. ESPPs are commonly offered by multinational or US‑headquartered companies and, in the UK, are generally not tax‑advantaged schemes.

Enhanced Features of ESPPs

• Discount: ESPPs commonly provide shares at a discount to the market price, typically ranging between 5% and 15%.
• Contribution Limits: Plans usually cap how much stock an employee can purchase, often as a percentage of salary or a fixed monetary limit, to keep participation fair and accessible.
• Look-Back Provisions: Many ESPPs feature a “look‑back” option that sets the purchase price using the lower of the share price at the start or end of the offering period.
• Automatic Purchasing: At the close of the offering period, shares are typically purchased automatically, so participation does not require active trading or market monitoring.

Additional Benefits of ESPPs

Participating in an ESPP can foster a sense of ownership and connection to your employer. For UK taxpayers, the discount you receive at the time of purchase is usually treated as employment income and may be subject to PAYE and National Insurance. Any further profit or loss when you later sell the shares is generally subject to CGT. Holding the shares for longer does not create a preferential UK CGT rate. Different tax rules apply to UK tax‑advantaged plans such as Share Incentive Plans⁶ (SIP) or Save As You Earn⁷ (SAYE), where offered.

Strategic Considerations

Consider how ESPP participation fits your wider portfolio and cash flow. Avoid over‑concentration in your employer’s shares, be mindful of dealing windows and blackout periods, and consider currency risk if the shares are listed overseas. Plan for any tax arising at purchase and disposal, and speak to a financial adviser if you are unsure.

By understanding the features of your ESPP and its related tax treatment, you can decide whether participation aligns with your objectives. Remember that share prices can go down as well as up, and you may get back less than you invest.

Considerations When Participating in Employee Share Schemes

While employee share schemes can be valuable, be aware of the following:

1. Diversification: Building a large position in your employer’s shares creates concentration risk. As a broad rule of thumb (not a recommendation), many investors aim to limit employer stock to around 10-20% of their overall investment portfolio.
2. Liquidity and Selling Restrictions: Plan rules and company dealing codes may restrict when you can sell (for example, during blackout periods). This can reduce flexibility, including at times when you need cash or markets are volatile.
3. Market Volatility: Share prices can be volatile and influenced by company‑specific news, sector trends and wider economic conditions. If shares are denominated in a foreign currency, exchange‑rate movements can also affect your outcome.

Additional Considerations

In addition to the above points, consider the following when participating in employee share schemes:

• Changes in Tax Legislation: UK tax rules for employment‑related shares are complex and can change. For example, on disposal, you may fall within CGT, where liabilities depend on the size of the gain and your tax band; unlike some countries, the UK does not offer lower CGT rates simply for holding shares longer. Check current HMRC guidance or seek advice.
• Company Performance: While employee share schemes align your interests with those of the company, your outcome will also depend on how the business performs, which may diverge from the wider market.
• Personal Financial Goals: Assess how the scheme fits your risk tolerance, time horizon and existing commitments. What suits a colleague may not be right for you.

It is beneficial to review your portfolio regularly and treat these schemes as part of a broader investment plan. If needed, obtain regulated financial advice tailored to your circumstances.

A Financial Adviser Can Help

RSUs and ESPPs can be technically and tax‑complex. A qualified financial adviser can help you understand how participation might affect your cash flow, tax position and long‑term plans, and explain the risks as well as the potential benefits. This information is for education only and is not personal advice.

FinancialAdvisers.co.uk can connect you with an FCA‑authorised and regulated financial adviser in your area. An adviser can provide tailored guidance on employee share schemes and how they may fit within your wider financial planning.

This article contains external links for further information on topics. Whilst all attempts are made to verify the trustworthiness of these external sources, we accept no responsibilty for the upkeep or security of these external websites. Some of these links in particular are annotated below:

• ¹ https://www.investopedia.com/terms/r/restricted-stock-unit.asp
• ² https://www.gov.uk/tax-employee-share-schemes/company-share-option-plan
• ³ https://www.moneyhelper.org.uk/en/work/employment/how-income-tax-and-personal-allowance-works
• ⁴ https://ifs.org.uk/taxlab/taxlab-taxes-explained/national-insurance-contributions-explained
• ⁵ https://www.litrg.org.uk/savings-property/capital-gains-tax
• ⁶ https://uk.indeed.com/hire/c/info/employee-share-scheme
• ⁷ https://www.moneysavingexpert.com/savings/sharesave-scheme/