UK CGT Share Disposal Calculator 2026/27
Calculate UK Capital Gains Tax (CGT) on share disposals — £3,000 Annual Exempt Amount for 2026/27, 18% basic-rate band, 24% higher-rate band. Includes Bed & ISA strategy preview.
| Gain (proceeds – cost) | — |
| (–) Annual Exempt Amount | — |
| Taxable gain | — |
| Basic-rate share at 18% | — |
| Higher-rate share at 24% | — |
| Total CGT due | — |
UK Capital Gains Tax (CGT) on shares is charged at 18% for the portion of gains within the basic-rate income band and 24% above it (rates updated April 2025). The Annual Exempt Amount (AEA) is £3,000 for 2026/27. Smart timing across tax years and use of ISAs can materially reduce CGT bills.
UK CGT Rates 2026/27 (Shares)
Annual Exempt Amount: £3,000 per individual per tax year (down from £6,000 in 2023/24 and £12,300 in 2022/23). Basic rate: 18% (gains within remaining basic-rate income band). Higher rate: 24% (above the £50,270 threshold). Note: residential property rates differ (24% only).
Bed & ISA Strategy
Sell shares in your taxable General Investment Account, immediately rebuy the same shares inside an ISA. The sale triggers a CGT event (use up your AEA), the repurchase resets the cost base, and future growth is inside the tax-free ISA wrapper. Cannot be done within 30 days for the same security to avoid 'bed and breakfast' rules — but Bed & ISA is exempt from this restriction.
Section 104 Pool
Shares of the same class are pooled in HMRC's Section 104 method — cost base is the weighted-average cost of all shares of that class purchased outside the same-day and 30-day windows. This calculator uses the Section 104 pool cost. For complex multi-purchase records, use HMRC's helpsheet HS284.
Last updated May 2026. Sources: GOV.UK CGT Rates, HMRC HS284 Shares & Capital Gains.