This HMRC helpsheet explains how employee share schemes and share options are treated for Capital Gains Tax, covering approved schemes (like SIP, SAYE, CSOP, EMI) and unapproved arrangements. In general, your CGT cost is what you paid for the shares plus any amount already taxed as employment income, with special rules for different schemes (for example, SIP shares can be CGT-free if held correctly, and EMI options get favourable treatment including from grant date for relief purposes). It also sets out administrative rules such as reporting requirements, elections (like same-day share acquisition elections), transfers to ISAs or pensions, and reliefs for certain disposals, all of which affect how and when tax is calculated on employee-related shares.