This calculator applies statutory SIP caps and standard SIP holding-period tax treatment. Your employer can set lower scheme limits, and your actual payroll tax depends on your personal tax code, UK region, pay period, and NI category.
Free shares are capped at ยฃ3,600 per tax year.
Partnership shares are capped at the lower of ยฃ1,800 or 10% of salary per tax year.
Matching shares are capped at 2 matching shares for each partnership share bought.
After 5 years in the SIP, no Income Tax or employee NI is estimated on removal.
Result options
Print, copy, or download your result
Use these quick actions after calculating. PDF summary buttons inside the result box still work where available.
Share Incentive Plan Calculator guide
Formula, example, FAQs, and notes
Formula explanation in simple language
The SIP estimate calculates eligible partnership shares, employer matching shares, free shares, immediate tax/NIC savings, and projected share value. It then applies the selected holding-period assumptions to estimate possible withdrawal charges.
Partnership share contribution is capped by entered salary and statutory/current SIP limits.
Matching shares are calculated from the selected employer matching ratio.
Tax and National Insurance savings use the editable tax/NI rates.
Projected value compounds share value by the entered growth rate and projection period.
Holding-period rules determine whether early withdrawal tax is estimated.
Example calculation
Example: salary ยฃ30,000, partnership contribution ยฃ1,800, share price ยฃ10, 1:1 matching, and 5 years holding period. The calculator estimates partnership shares, matching shares, tax/NIC savings, and projected value.
After changing any input, recalculate and compare the new result with the original assumptions.
Common mistakes and interpretation notes
Do not leave default values unchanged if they do not match your real situation.
When changing currency, confirm that money fields converted to the correct selected currency before comparing results.
Check units carefully before calculating. Mixing inches, feet, pounds, kilograms, days, months, or years can change the result.
Treat the result as an estimate, not a guarantee, quote, diagnosis, settlement promise, or final professional decision.
Do not ignore tax treatment, fees, compounding assumptions, policy limits, inflation, or rate changes.
Disclaimer
This is a planning estimate, not UK tax advice. Employer SIP rules, payroll treatment, UK region, NI category, tax code, and future tax law can change the result.
Share Incentive Plan Calculator FAQ
Helpful answers for long-tail searches
How accurate is the Share Incentive Plan Calculator?
The Share Incentive Plan Calculator is accurate to the formula and assumptions shown on the page. Real-world results can change when costs, rates, taxes, laws, health factors, or project conditions differ from the values you enter.
Can I download the Share Incentive Plan Calculator result?
Yes. Use the page result controls to download the PDF summary when available, or use the Print, Copy Result, and Download TXT buttons added below the calculator.
Does the Share Incentive Plan Calculator convert currencies using exchange rates?
Yes. Money fields use the selected currency display and the site exchange-rate endpoint where supported. The PDF or result note shows the currency/rate information when available.
What inputs matter most in the Share Incentive Plan Calculator?
The most important inputs are usually the largest cost, rate, quantity, time, and risk assumptions. Small changes in these fields can move the final result significantly.
Is the Share Incentive Plan Calculator financial advice?
No. This calculator is an educational estimate and is not financial advice. Use it for planning and discussion, then verify important decisions with a qualified professional.
