RSUs and Tax in the UK: What Employees Need to Know About Restricted Stock Units
Restricted Stock Units, commonly known as RSUs, have become an increasingly common part of remuneration packages, particularly for employees working for large multinational, technology and listed companies.
An RSU can be a valuable benefit, but the tax position is not always straightforward. Employees can find themselves receiving shares, having shares automatically sold to meet a tax liability and potentially becoming liable for further tax when the remaining shares are eventually sold.
Understanding when tax becomes due, how it is calculated and how RSUs fit into your wider financial plan can help you make more informed decisions about whether to retain or sell the shares you receive.
What is an RSU?
A Restricted Stock Unit is a promise by an employer to provide an employee with shares, or sometimes their cash equivalent, once specified conditions have been satisfied.
Unlike owning a share from the outset, an RSU will commonly have a vesting period. For example, an employer might award RSUs that vest in stages over three or four years. Until the relevant units vest, the employee does not normally have unrestricted ownership of the underlying shares.
Vesting conditions vary between employers and may depend on remaining employed for a particular period, achieving performance targets or a combination of different conditions.
HMRC treats shares and other securities provided in connection with employment as employment-related securities. Broadly, the UK tax system seeks to tax the value received as a reward for employment in a similar way to other employment remuneration.
When do you normally pay tax on RSUs?
For many conventional RSU arrangements, the important point from a UK tax perspective is when the award vests and the employee becomes entitled to the shares.
At this stage, the value received will generally be treated as employment income rather than an investment gain. Income Tax and, where applicable, National Insurance contributions can therefore become payable.
HMRC’s general principle for employment-related securities is that the value an employee receives as a reward for their services is subject to Income Tax and National Insurance when that value becomes accessible to them.
This can create a surprisingly large tax charge where a substantial number of RSUs vest at once.
For example, if 1,000 shares vest when the shares are worth £40 each, the award has a value of £40,000. Subject to the particular terms of the scheme, that amount may form part of the employee’s taxable employment income for the year.
Importantly, the tax consequences are based on the value of the shares at the relevant taxable event. What subsequently happens to the share price is a separate matter.
For employees receiving significant share-based remuneration, working with an independent adviser alongside an appropriate tax professional can help ensure RSUs are considered alongside pension planning, cash flow and other investments rather than being viewed in isolation.
Book a meeting with an adviser to discuss how RSUs could fit within your wider financial plan.
How is the tax actually collected?
For listed shares and other readily convertible assets, PAYE will commonly apply. HMRC guidance states that where employment income arises from employment-related securities that are readily convertible assets, PAYE is generally due, together with National Insurance where applicable.
In practice, many employers operate what is sometimes described as a “sell to cover” arrangement.
If 1,000 shares vest, for example, some of those shares might immediately be sold and the proceeds used to meet the PAYE and National Insurance liability. The employee receives the remaining shares after the necessary deductions have been made.
This can occasionally cause confusion because employees may see fewer shares arrive in their investment account than the number that originally vested.
It is therefore worth retaining vesting statements, payslips and transaction records. These can be important when calculating the acquisition cost of the shares and any future Capital Gains Tax liability.
What happens if you keep the shares?
Once the shares have vested and the relevant employment taxes have been dealt with, future movements in their value will generally move into the Capital Gains Tax regime rather than being taxed again as employment income.
HMRC’s guidance confirms that normal subsequent commercial growth in shares that have already been taxed as employment remuneration generally falls within Capital Gains Tax.
Broadly, the market value used when you acquire employment-related shares will usually form part of the acquisition value used when calculating a subsequent capital gain, although the precise calculation can be more complicated for certain restricted securities and other specialist arrangements.
As a simplified example, suppose shares are worth £40 each when they vest and are later sold for £55.
The £40 value has already been dealt with through the employment tax regime. The subsequent £15 increase in value may represent a capital gain.
This distinction is important. You should not normally be paying Capital Gains Tax on the entire sale proceeds simply because you originally received the shares through your employment.
Capital Gains Tax on RSUs
For the 2026/27 tax year, individuals generally have a £3,000 Capital Gains Tax annual exempt amount, although eligibility and individual circumstances can affect its availability. Gains above the available exemption may become taxable.
For most gains on shares in 2026/27, the main CGT rates are 18% and 24%, depending on the individual’s taxable income and the amount of their gains.
This means the timing and size of share disposals can potentially make a material difference.
It may sometimes be possible to spread disposals between tax years, realise available capital losses or coordinate disposals with other investments. These decisions should, however, be driven by the overall financial position rather than tax considerations alone.
A financial advisor providing a broader investment service can also help assess whether retaining a large employer shareholding is appropriate in the first place.
The concentration risk problem
Tax is only one part of RSU planning.
One of the biggest financial planning issues created by RSUs is concentration risk.
Employees can gradually build up significant holdings in their employer without consciously choosing to do so. A person might receive annual RSU awards over many years while also receiving their salary, bonus and potentially other benefits from the same company.
Their financial position can then become unusually dependent on a single business.
If the company performs badly, the employee could potentially experience several problems simultaneously:
-the value of their RSUs falls;
-their existing employer shares fall;
-future bonuses or RSU awards may reduce; and
-in more extreme cases, their employment could become less secure.
Diversification cannot eliminate investment risk, but it can reduce the extent to which your financial future depends on the fortunes of one company.
A financial adviser assessing the best approach for your circumstances should therefore look beyond the immediate tax bill and consider your total exposure to the company alongside your other assets, liabilities and future objectives.
Book a meeting with an adviser if you would like to review whether employer shares have become too large a proportion of your investments.
Should you sell RSUs as soon as they vest?
There is no universal answer.
A useful question is to separate how the shares were acquired from whether you would actively choose to own them today.
Imagine receiving £50,000 in cash from your employer rather than £50,000 of company shares. Would you immediately use all £50,000 to buy shares in your employer?
If the answer is no, it may be worth considering why you would automatically retain £50,000 of shares simply because that is how you were remunerated.
There may nevertheless be good reasons for retaining some or all of the shares. Your view of the investment, other assets, capital gains position, future RSU awards and long-term objectives are all relevant.
This is where a top financial adviser should focus on the overall financial planning decision rather than simply attempting to predict whether the company’s share price will rise or fall.
RSUs and pension planning
Large RSU awards can push an employee’s taxable income materially higher in a particular tax year.
That can make pension planning especially relevant.
Depending on your circumstances and the applicable pension rules, making or increasing pension contributions may help improve tax efficiency while building assets for retirement.
For higher earners, however, pension allowances can be complicated. The annual allowance, potential tapering and the availability of unused allowance from previous years may all need to be considered.
RSU income can also interact with other elements of the tax system, including the gradual loss of the Personal Allowance for individuals whose adjusted net income exceeds the relevant threshold.
A financial advisor experienced in pension planning can work alongside your accountant or tax adviser to identify opportunities before the end of the tax year rather than discovering them after the opportunity has passed.
What about RSUs from an overseas employer?
International RSU arrangements can be significantly more complicated.
You may work in the UK but receive RSUs in a US-listed or other overseas parent company. You may have been granted RSUs while living in one country, moved internationally during the vesting period and eventually received the shares while resident somewhere else.
Questions can then arise around residence, the period during which the award was earned, foreign taxes, double taxation agreements, overseas withholding and currency conversion.
Dividend equivalent payments attached to RSUs can create additional issues. HMRC states that these payments will generally be taxed as earnings when received, subject to the specific structure of the arrangement.
Cross-border RSU cases should therefore normally be considered with an appropriately qualified tax professional rather than relying solely on general guidance.
RSUs should form part of your wider financial plan
For many employees, RSUs eventually become one of their largest assets outside their pension and home.
They should therefore be included in normal financial planning discussions.
That could involve looking at:
-how much of your wealth is held in employer shares;
-when future awards are expected to vest;
-your potential Income Tax and Capital Gains Tax liabilities;
-whether shares should gradually be diversified;
-pension contributions and tax-year planning;
-ISA funding and other investment allowances;
-emergency cash reserves;
-mortgage or other debt repayment;
-retirement planning; and
-financial protection for you and your family.
If you are trying to find financial adviser support for RSUs, it can be useful to choose an adviser who understands both investment planning and the practical implications of employment-related shares. An independent financial adviser can consider your employer shares alongside the wider market rather than treating them as a standalone investment.
The fees for financial advice should also be made clear before proceeding, allowing you to understand the cost of the service and what ongoing support is included.
Keep good records
Finally, maintain detailed records of your RSU awards.
These might include grant statements, vesting confirmations, payslips showing tax deductions, details of shares sold to cover tax, contract notes and records of subsequent sales.
This information can become particularly important if you accumulate shares through multiple vesting dates at different prices.
HMRC publishes specific guidance for people completing tax returns involving employment-related shares and securities, including guidance covering Capital Gains Tax calculations on employee shares.
Bringing everything together
RSUs can be an extremely valuable part of an employment package, but receiving shares creates different financial planning considerations from simply receiving a cash salary.
There are effectively two stages to think about: the employment tax consequences when value is received and the potential Capital Gains Tax consequences of subsequent movements in the share price.
Beyond tax, there is also the question of what to do with the shares themselves.
For employees receiving regular or substantial RSU awards, the objective should not simply be to minimise tax. It should be to build a coordinated strategy covering tax efficiency, diversification, retirement planning and longer-term financial goals.
A certified adviser or suitably qualified independent financial adviser can help bring these different areas together, while specialist tax advice should be obtained where your RSUs involve complex tax or international considerations.
Book a meeting with an adviser to discuss your RSUs and how they could be incorporated into your broader financial planning strategy.
The information in this article is provided for general information purposes and does not constitute personalised financial or tax advice. Tax treatment depends on individual circumstances and may change. Where appropriate, specialist tax advice should be obtained.
