In simple terms, it’s a plan that allows employees to acquire shares in their company, but the real benefit depends on understanding how the rules and setup work.
Don’t worry, we will guide you all down in plain language, what a Share Incentive Plan is, how the four share types work, what tax savings you can expect, and how to work out whether joining makes sense for you.
"If you want to skip straight to the numbers, this free and reliable Share Incentive Plan calculator lets you estimate your potential tax savings and returns in minutes."
What Is a Share Incentive Plan?
A Share Incentive Plan (SIP) is an HMRC-approved share scheme that allows UK employees to acquire shares in their employer’s company in a tax-efficient way.
In a SIP, if shares are held for the required holding period, they are generally exempt from Income Tax and National Insurance Contributions (NICs).
There are four types of shares in the plan: Free Shares, Partnership Shares, Matching Shares, and Dividend Shares.
According to the rules set by HM Revenue and Customs, SIPs must be offered on equal terms to all eligible employees, which is why they are considered one of the most accessible employee share schemes in the UK.
A Share Incentive Plan (SIP) is set up by your employer and must be approved by HM Revenue and Customs. This approval is what gives the plan its key tax advantages.
If shares are kept within the plan for the required holding period, you typically do not pay Income Tax or National Insurance Contributions (NICs) on their value.
The plan is run through a trust, which holds the shares on your behalf until you decide to take them out, or until you leave employment. Try our SIP calculator tool to estimate your benefit.
The Four Types of SIP Shares Explained
1. Free Shares — Something for Nothing
Your employer can give you up to £3,600 worth of Free Shares each tax year, simply because you are an employee. You do not need to invest your own money to receive them.
These Free Shares usually need to stay in the plan for around 3 to 5 years (the exact period is set by the employer). If you withdraw them earlier than this holding period, Income Tax and National Insurance Contributions (NICs) may apply on their value.
2. Partnership Shares — Buy From Your Pre-Tax Salary
Partnership Shares are shares you buy yourself from your salary, but the purchase is made using pre-tax income meaning the amount is deducted before Income Tax and National Insurance Contributions (NICs) are applied.
You can invest up to £1,800 per tax year or 10% of your salary (whichever is lower).
Since the money comes from your gross pay, you also benefit from tax savings, basic rate taxpayers typically save around 20% Income Tax and 8% NICs, while higher-rate taxpayers may save more. Understand how dividend shares are reinvested inside your plan.
3. Matching Shares — Extra Shares From Your Employer
If your employer offers a Matching Shares option, they can give you up to two additional free shares for every partnership share you buy. This is essentially an extra benefit provided in the form of shares rather than salary.
Matching Shares must usually be kept in the SIP for the same holding period as partnership shares, typically 3 to 5 years. If you sell or withdraw your partnership shares early, you will often lose the matching shares as well.
4. Dividend Shares — Reinvesting Your Returns
If you receive dividends on your SIP shares, you can reinvest them back into the plan. These are then used to buy additional shares, known as Dividend Shares.
Up to £500 of dividend income per tax year can be reinvested without paying Income Tax on it.
These Dividend Shares usually need to remain in the SIP for at least 3 years to retain their tax advantages. This option is typically available in companies that pay dividends, most often larger or listed companies.
SIP Tax Benefits: What Do You Actually Save?
The SIP tax benefits are genuinely significant, particularly for partnership shares. Here is a straightforward summary:
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Income Tax: Not charged on shares acquired within the plan, provided they are held for the required period.
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National Insurance: Neither you nor your employer pays NICs on shares inside the plan.
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Capital Gains Tax: Shares transferred directly from the plan to an ISA within 90 days of withdrawal are not subject to CGT, even if they have grown significantly in value.
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Dividend Tax: Dividend shares reinvested within the plan are free from Income Tax up to the £500 annual limit.
If you look at it in numbers, a basic-rate taxpayer who buys £1,800 worth of partnership shares may end up with an effective cost of around £1,260 after tax and National Insurance savings.
For higher-rate taxpayers, the savings can be even greater. The actual benefit depends on your tax rate, salary level, and your employer’s specific SIP structure. We've explained theSIP withdrawal rules and the five-year holding period in this article. Must check it out for knowledge gaining.
Who Is Eligible for a SIP?
SIPs are typically offered on equal terms to all eligible UK employees, meaning an employer cannot exclude someone based on seniority or performance. If the plan is open, it must be open to everyone who qualifies.
However, employers may set a condition requiring employees to complete up to 18 months of service before joining. Some plans allow immediate participation, while others include a waiting period.
This scheme can only be operated by companies that meet the qualifying requirements set by HM Revenue and Customs. This usually includes many listed UK companies as well as a significant number of private businesses that meet the criteria.
Is Joining a Share Incentive Plan Worth It?
For most employees, especially those buying partnership shares, the immediate tax savings make SIP a very attractive option. You effectively acquire shares at a lower upfront cost, regardless of how the share price moves later.
If your employer offers matching shares, for example 2 shares for every 1 you buy, this can effectively become a 200% employer contribution. Importantly, this benefit applies before any share price movement.
The main risk is that the company’s share price may fall, reducing the overall value of your shares, since this is not a guaranteed cash bonus. This risk is generally higher in smaller or more volatile companies.
If you work for a large, stable company and can afford to lock away part of your salary for a few years, SIP is usually considered a strong employee benefit. What happens to your SIP shares if you leave job?
Frequently Asked Questions
Are SIP shares counted as part of my pension for tax purposes?
No. SIP shares are separate from pension contributions and are not treated as pensionable pay.
Can I withdraw from a Share Incentive Plan early?
Yes, you can withdraw your shares before the holding period ends, but you will owe Income Tax and National Insurance Contributions on their value at the point of withdrawal.
What happens to my SIP shares during a company takeover?
In most cases, a takeover is treated as a good leaver event under HMRC rules, which means your shares are released to you free of Income Tax and NICs regardless of how long they have been in the plan.
Can I transfer SIP shares into a Stocks and Shares ISA?
Yes, and this is one of the most valuable features of the plan. You can transfer shares directly from your SIP into a Stocks and Shares ISA within 90 days of withdrawing them, without triggering a Capital Gains Tax charge on any growth.
Do all UK employers have to offer a SIP?
No. Offering it is entirely voluntary for employers. The SIP framework is set up and approved by HMRC, but it is up to individual companies to decide whether to run one.