Share Incentive Plan Calculator
UK SIP Calculator — Free, Partnership, Matching & Dividend Shares · Income Tax & NICs Savings
How to Use the Share Incentive Plan Calculator
This free UK SIP calculator helps you estimate the long-term value of your Share Incentive Plan and the tax savings you can achieve. Here is how to use it step by step:
- Step 1 — Enter your Free Shares value: Input the annual value of free shares your employer awards you — up to the HMRC limit of £3,600 per year. If your employer does not offer free shares, leave this at £0.
- Step 2 — Enter your Partnership Shares: Enter how much you contribute annually from your pre-tax salary to buy partnership shares — up to £1,800 per year or 10% of your salary, whichever is lower.
- Step 3 — Select the Matching Shares ratio: Choose whether your employer offers 0:1, 1:1 or 2:1 matching shares for every partnership share you purchase. The 2:1 ratio is the maximum allowed under HMRC rules.
- Step 4 — Set your Dividend Yield: Enter the expected annual dividend yield from your company shares. UK FTSE companies typically yield between 2% and 5%. These dividends are reinvested as additional shares inside the plan.
- Step 5 — Set growth, tax rate and holding period: Enter your expected annual share price growth, select your income tax band, and choose how many years you plan to keep the shares in the plan.
- Step 6 — Read your results: The summary card shows your total projected value, total tax saved, and a year-by-year projection table. Rows highlighted in green indicate years where the 5-year tax-free milestone is reached.
You can experiment with different holding periods to see exactly how much additional value the 5-year tax-free rule adds to your SIP. Click Reset to return to default values at any time.
How a Share Incentive Plan Works — UK Guide
A Share Incentive Plan (SIP) is one of the most tax-efficient employee share schemes available to UK workers. Shares are held in a trust on your behalf. As long as you keep them in the trust for the qualifying period, you benefit from significant Income Tax and National Insurance Contributions (NICs) savings.
HMRC 2025/26 Annual Limits
| Share Type | Who Provides | Annual Limit | Immediate Tax Saving? |
|---|---|---|---|
| Free Shares | Employer | £3,600/year | N/A — given free |
| Partnership Shares | Employee (pre-tax) | £1,800/year or 10% salary | Yes — Income Tax + NICs |
| Matching Shares | Employer | Up to 2 per partnership share | N/A — given free |
| Dividend Shares | Reinvested dividends | No set limit | Tax-free reinvestment |
| Combined Maximum | — | £9,000/year | — |
The 5-Year Tax-Free Rule
The most powerful benefit of a SIP is what happens after 5 years. If you keep your shares in the SIP trust for at least 5 years from the date they were awarded, you pay zero Income Tax and zero NICs when you withdraw them — no matter how much the shares have grown in value. This is unique to SIPs and is one of the most generous tax reliefs available to UK employees.
Tax Treatment at Different Holding Periods
| Holding Period | Income Tax | NICs | What is Taxed? |
|---|---|---|---|
| Under 3 years | Yes | Yes | Full market value at withdrawal |
| 3 to 5 years | Yes (partial) | Yes (partial) | Original award value only |
| 5 years or more | None | None | Completely tax-free |
Why Use the CalcVelo SIP Calculator?
Understanding the real value of your Share Incentive Plan requires accurate compounding calculations and correct tax treatment. Our calculator is built to give you the most reliable estimate possible.
About Share Incentive Plans in the UK
Share Incentive Plans (SIPs) were introduced in the UK through the Finance Act 2000 and are one of four HMRC-approved employee share schemes, alongside SAYE (Save As You Earn), EMI (Enterprise Management Incentives), and CSOP (Company Share Option Plans). SIPs are the most widely used scheme in the UK, with over 850,000 employees participating across hundreds of companies.
Who Offers SIPs?
SIPs are offered by many large UK employers across sectors including retail, finance, energy, and technology. Notable companies that operate SIPs include major FTSE 100 and FTSE 250 companies. SIPs must be offered to all eligible employees on the same terms — they cannot be selective. This makes them different from executive share schemes.
Key Advantages of a SIP
- Partnership shares are purchased from gross (pre-tax) salary — saving Income Tax and NICs immediately on every contribution.
- Free and matching shares awarded by your employer cost you nothing and can grow completely tax-free if held for 5 years.
- Dividends reinvested as dividend shares inside the plan also benefit from tax-free treatment after 5 years.
- You build a meaningful shareholding in your employer company over time — aligning your financial interests with the company's success.
- If the company is taken over or you are made redundant, your shares are released and the 5-year rule still applies if the period has been met.
Things to Consider
- Your SIP investment is tied to your employer's share price — if the company performs poorly, your investment may fall in value.
- This calculator provides estimates only. Actual returns depend on real share price movements and dividend payments.
- Always consult a qualified UK independent financial adviser before making decisions based on SIP projections.
- HMRC limits and tax rates may change in future budget announcements — always check the current HMRC guidelines.