Capital Gains Tax on shares in 2026/27

For 6 April 2026 to 5 April 2027: the individual annual exempt amount is £3,000. The main CGT rates for shares are 18% within the unused basic-rate band and 24% above it.

2026/27 figures at a glance

Sources: CGT rates and allowances and 2026/27 rates and allowances.

The tax year does not reset the share pool

Disposals in 2026/27 may depend on acquisitions from earlier years. Same-day and following-30-day acquisitions are identified first, then the Section 104 pool. Import enough history to establish the pool; a tax-year-only statement may be insufficient.

HMRC's 2026 HS284 helpsheet confirms the identification order: same-day acquisitions first, acquisitions in the following 30 days second, then the Section 104 holding. This order applies before you compare the year's net gains with the annual exempt amount.

Worked rate example

Assume taxable income after allowances is £20,000 and net gains before the annual exempt amount are £12,600. Deducting the £3,000 exemption leaves £9,600. Because £20,000 plus £9,600 remains within the £37,700 basic-rate band for 2026/27, the example gain is charged at 18%, giving £1,728. If taxable income plus taxable gains crosses the band, the excess is charged at 24%.

This mirrors the published GOV.UK CGT rate example. Your result can differ where reliefs, losses, residential property, Business Asset Disposal Relief, Investors' Relief, non-residence or other special rules apply.

Calculate 2026/27 disposals

The FiscalFox calculator supports 2026/27 estimates now. The 2026/27 SA108 form has not yet been published, so any field mapping must wait for HMRC’s filing-year form. Use the estimate for record keeping and planning, and verify final filing requirements when HMRC publishes them.

Losses and filing

Allowable current-year losses are deducted before the annual exempt amount. FiscalFox does not currently apply losses brought forward from earlier years. HMRC’s Capital Gains Manual explains the ordering; use your recorded balance when completing the final return.

If you are registered for Self Assessment, GOV.UK says gains must also be reported when total disposal proceeds exceed £50,000 for 2023/24 onwards, even if gains are below the annual exempt amount. Check the current reporting test against all relevant disposals, not only transactions imported into one calculator.

Records to assemble for 2026/27

Keep the original broker exports, contract notes for corrections or unusual trades, evidence of fees, exchange rates used for non-sterling transactions, and documents for transfers or corporate actions. Reconcile total proceeds and transaction counts to each broker before relying on a combined calculation.

Also retain the opening and closing Section 104 quantities and pooled costs for each security. Those balances connect one tax year to the next. A report limited to disposals in 2026/27 is not, by itself, evidence that the historic pool was complete. Record any manual adjustment, its source and the person who reviewed it.