This page estimates UK Capital Gains Tax on shares and funds for the 2025-26 tax year. Capital Gains Tax on selling shares, unit trusts and other investment funds (outside an ISA or pension) in the 2025-26 tax year. The calculator above is pre-filled with a realistic example and you can change every figure.
Worked example
On a £15,000 gain with £30,000 of other taxable income, CGT is £2,418 — £1,386 at 18% on the £7,700 sitting in the basic-rate band, plus £1,032 at 24% on the £4,300 above it, after the £3,000 allowance.
| Step | Amount |
|---|---|
| Capital gain | £15,000 |
| Less £3,000 annual exempt amount | −£3,000 |
| Taxable gain | £12,000 |
| Taxed at 18% (within basic-rate band) | £7,700 → £1,386 |
| Taxed at 24% (above basic-rate band) | £4,300 → £1,032 |
| CGT due | £2,418 |
| Net after CGT | £12,582 |
| Effective rate on the gain | 16.1% |
Shares held in an ISA or pension are exempt from CGT — only gains on shares held in a general investment account are chargeable. The ‘same-day’ and ‘30-day bed-and-breakfast’ share matching rules and Section 104 pooling determine your gain; this tool assumes you have already worked out the chargeable gain.
CGT rates & allowance — 2025-26
| Item | 2025-26 figure |
|---|---|
| Annual exempt amount (individuals) | £3,000 |
| Annual exempt amount (most trusts) | £1,500 |
| Main rate — gains within unused basic-rate band | 18% |
| Main rate — gains above basic-rate band | 24% |
| Residential property — basic / higher | 18% / 24% |
| Trustees & personal representatives | 24% |
| Business Asset Disposal Relief | 14% (lifetime limit £1,000,000) |
| Basic-rate band split point (taxable income) | £37,700 |
The main 18% / 24% rates apply to all chargeable assets for disposals on or after 30 October 2024, so they cover the whole 2025-26 tax year. Your gain is stacked on top of your taxable income: the part still within the £37,700 basic-rate band is taxed at 18%, and the rest at 24%.
How CGT is worked out
- Gain = disposal proceeds − cost − allowable expenses.
- Subtract the £3,000 annual exempt amount (per person, can’t be carried forward).
- Stack on income: taxable income up to £37,700 uses the basic-rate band; the unused part is available for the gain at 18%.
- Apply the rates: 18% within the remaining basic-rate band, 24% above.
Sources & as-of
- Annual exempt amount (£3,000) and rates: GOV.UK — Capital Gains Tax rates and allowances.
- 18% / 24% main rates effective 30 October 2024: GOV.UK — Capital Gains Tax rates of tax.
- Business Asset Disposal Relief 14% from 6 April 2025: HMRC CG63515.
- Income Tax thresholds (£12,570 / £37,700 / £50,270): GOV.UK — Personal Allowance and basic rate limit 2022–2026.
- 60-day property reporting: GOV.UK — Report and pay CGT.
- Page data as-of 2026-06-18. This is a planning estimate, not tax advice. Share-matching/pooling, reliefs and losses can change your gain — confirm your position on GOV.UK or with an adviser. Rates can change at fiscal events.