A Share Incentive Plan holding period is an important part of understanding how SIP shares work. If your employer offers a Share Incentive Plan, you may receive free shares, buy partnership shares, receive matching shares or reinvest dividends into additional shares.
However, you may not always receive the same tax treatment if you take those shares out of the plan early.
The length of time you keep your shares in the plan can affect the tax advantages available to you. That is why understanding the SIP holding period can help you make better decisions about your employee shares.
If you are new to Share Incentive Plans, you may also want to read our guide on What Is a Share Incentive Plan? before looking at the holding period rules.
What Is a Share Incentive Plan Holding Period?
The Share Incentive Plan holding period is the period during which your shares remain inside the SIP.
Different types of SIP shares can have different rules. Free shares and matching shares generally need to remain in the plan for a certain period before you can take them out without losing some of their tax advantages.
The reason for taking shares out can also matter. For example, leaving your employer because of retirement or redundancy can receive different tax treatment from leaving voluntarily.
So, there is no single rule that applies to every situation.
How Long Do You Have to Keep SIP Shares?
For many SIP shares, the five-year holding period is particularly important.
Under current UK rules, if qualifying shares remain in the Share Incentive Plan for five years, you generally do not pay Income Tax or National Insurance on their value. GOV.UK also explains that different rules can apply when shares leave the plan earlier.
This means that the length of time you hold your shares can have a direct effect on the tax benefits you receive.
For example, an employee who keeps qualifying shares in the plan for the full five-year period may receive more favourable treatment than someone who removes them after only two years.
What Is the Three-Year SIP Rule?
The three-year point is also important.
Free and matching shares generally cannot be taken out of the plan during the first three years. Your employer can choose to apply a longer holding period, up to five years, within the scheme rules.
After three years, the tax consequences can still depend on the exact circumstances.
Therefore, reaching three years does not automatically mean that every tax benefit has become available.
The five-year point is generally more significant when considering the full Income Tax and National Insurance advantages.
What Happens If You Take SIP Shares Out Early?
Taking SIP shares out before the end of the relevant holding period can affect their tax treatment.
The outcome depends on several factors, including:
- The type of SIP shares
- How long you held them
- Why you removed them
- Whether you remain employed by the company
- The rules of your employer’s SIP
For example, taking shares out voluntarily before the relevant period can result in Income Tax and National Insurance becoming payable in circumstances where they would not have been payable after the full holding period.
That is why you should not look only at the current market value of your shares when deciding whether to withdraw them.
Do Partnership Shares Have the Same Holding Period?
Not exactly.
Partnership shares have different rules from free and matching shares.
You purchase partnership shares using deductions from your salary, and you can generally take partnership shares out of the plan at any time. However, taking them out can affect the tax treatment and may also affect related matching shares.
This is one reason why it is useful to understand the difference between partnership shares and matching shares before making a withdrawal decision.
If you want to understand how the different share types work, read our comparison guide Free Shares vs Partnership Shares vs Matching Shares vs Dividend Shares.
What Happens to Matching Shares?
Matching shares are linked to partnership shares.
For example, an employer might offer one matching share for every partnership share you purchase. If you buy 100 partnership shares, you could receive another 100 matching shares.
The matching shares can have their own holding period requirements.
This makes the timing of a withdrawal particularly important. Taking partnership shares out too early could affect the matching shares associated with them, depending on the rules of the scheme.
Always check your employer’s SIP documentation before making a withdrawal.
How Long Do Dividend Shares Need to Stay in the Plan?
Dividend shares have their own rules.
Dividend shares are shares that you purchase using dividends from shares already held in your SIP.
The holding period for dividend shares differs from the five-year rule that applies to the full tax advantages for many other SIP shares.
Current HMRC guidance provides specific rules for dividend shares, including a three-year period for Income Tax treatment.
Therefore, if your SIP allows dividend reinvestment, make sure you understand the specific rules that apply to those shares.
What Happens If You Leave Your Employer?
Leaving your employer can change what happens to your SIP shares.
If you leave because of certain reasons, such as:
- Retirement
- Redundancy
- Disability
- Certain business transfers
the tax treatment can differ from leaving voluntarily.
The length of time you held the shares can also affect the result. GOV.UK provides specific guidance on what happens to SIP shares when an employee leaves the company.
For this reason, it is worth checking the scheme rules before you resign or make plans to remove your shares.

Does the Holding Period Affect Capital Gains Tax?
Yes, the way and timing of removing SIP shares can also affect Capital Gains Tax.
If qualifying SIP shares remain in the plan until you sell them, GOV.UK states that you do not pay Capital Gains Tax on the gains from that sale.
If you remove shares from the plan before selling them, different CGT rules can apply.
This is another reason to consider the complete tax position rather than focusing only on the share price.
Why the Holding Period Matters When Calculating SIP Value
The holding period can affect the potential overall benefit of your Share Incentive Plan.
Imagine that you have:
- 100 partnership shares
- 100 matching shares
- A current share price of £5
Your total holding would be 200 shares with a market value of £1,000.
But the final benefit is not necessarily £1,000.
You also need to consider how long you plan to hold the shares, whether the share price changes and what tax treatment applies when you eventually take the shares out.
This is where a Share Incentive Plan Calculator can be useful.
You can use our Share Incentive Plan Calculator to explore different contribution, share-price and matching scenarios and estimate the potential value of your SIP.
The calculator provides an estimate rather than a guaranteed future result.
Should You Keep SIP Shares for Five Years?
There is no universal answer.
Keeping qualifying shares in the plan for five years can provide important tax advantages, but your personal circumstances may make an earlier withdrawal appropriate.
For example, you may need access to the money, you may be leaving your employer, or you may want to reduce your exposure to a single company’s shares.
Remember that an SIP gives you an ownership interest in your employer. If the company’s share price falls, the value of your shares can fall as well.
Therefore, tax advantages should not be the only factor you consider.
What Should You Check Before Taking SIP Shares Out?
Before withdrawing your shares, check:
- What type of shares you hold
- When you acquired them
- How long they have been in the plan
- Why you are taking them out
- Whether matching shares are affected
- What tax may become payable
- Whether your employer has additional scheme conditions
Your employer’s SIP documentation should provide the details that apply to your specific plan.
If the amount involved is significant, consider getting professional tax or financial advice before making a decision.
Final Thoughts
Understanding the Share Incentive Plan holding period can help you see why timing matters when managing employee shares.
The three-year and five-year points are particularly important, but the rules differ depending on the type of shares and the circumstances in which you take them out.
Free shares, partnership shares, matching shares and dividend shares can all have different conditions. Your employer’s scheme rules therefore matter just as much as the general SIP rules.
If you want to estimate how your contributions, matching shares and share price could affect the potential value of your plan, use our [Share Incentive Plan Calculator].
You can also read our guide to Share Incentive Plan Tax Benefits to understand how holding periods can affect the tax advantages available to employees.
