Oddjobby
Menu

UK money

Capital gains tax calculator 2026/27

18% and 24%, the £3,000 exempt amount, and HMRC share matching.

Calculated in this page. Nothing you type is sent to a server.

These figures are estimates. They are not tax advice and they are not financial advice.

Business Asset Disposal Relief

From 6 April 2026 the relief rate is 18%. The lifetime limit is £1,000,000.00 of qualifying gains, not an annual limit. This page does not test whether a disposal qualifies. Anything above the limit left is taxed at the ordinary rates.

Capital Gains Tax£1,728.00
Gain before losses and the exempt amount£12,600.00
Annual exempt amount used£3,000.00
Taxed at 18%£9,600.00
Tax at 18%£1,728.00

Taxable income is £20,000.00 after a Personal Allowance of £12,570.00. The basic-rate band on the Capital Gains Tax rates page is £37,700, so £17,700.00 of it is unused. That unused slice is taxed at 18%. The rest of an ordinary gain is taxed at 24%. For 2026/27 those two rates apply to residential property and to other chargeable assets. The rates page does not set a separate residential pair.

Shares in an ISA or a PEP, and investments held for a registered pension scheme, are outside Capital Gains Tax. Do not enter them. Carried interest from 6 April 2026 is Income Tax and National Insurance, and is not calculated here. A gain on your main home is usually covered by Private Residence Relief, which is not calculated here. Other Income Tax reliefs, besides the Personal Allowance and its taper above £100,000, are not deducted. Scottish Income Tax bands are not used for this split.

How to use it

  1. Choose one disposal, or shares and funds if you have several trades in one holding.
  2. Enter the proceeds, the cost and the allowable costs, or each buy and sell.
  3. Enter losses and your income before the Personal Allowance. Open Business Asset Disposal Relief only if you know the disposal qualifies and how much of the lifetime limit is already used.
  4. Read the tax, and how much of the gain is at 18% and how much is at 24%.

The gain, the allowance, then the rate

These figures are estimates. They are not tax advice and they are not financial advice. For 2026/27 the gain is proceeds minus cost minus allowable costs. Losses of the same tax year come off in full. Losses brought forward are used only until the gain is down to the annual exempt amount of £3,000. What is left is taxed at 18% while it fits in the unused basic-rate band, and at 24% above that.

GOV.UK’s first example is taxable income of £20,000 and a gain of £12,600. The £3,000 allowance leaves £9,600. Added to the income, £29,600 is inside the £37,700 basic-rate band, so the tax is 18%, which is £1,728. Income of £32,570 with the full Personal Allowance is that £20,000 of taxable income. The second example, a gain of £52,600, is £3,186 at 18% and £7,656 at 24%, which is £10,842.

The basic-rate band used here is the £37,700 on the Capital Gains Tax rates page. Taxable income is income minus the Personal Allowance, including the taper above £100,000. Other Income Tax reliefs are not deducted. Scottish Income Tax bands are not used for the split. From 6 April 2026 the same 18% and 24% apply to residential property and to other chargeable assets.

Shares: same day, then 30 days, then the pool

For one holding, a disposal is matched with shares of the same class acquired on the same day, then with shares acquired in the next 30 days, then with the Section 104 pool. Same-day buys are treated as one acquisition. Shares matched on the day or within 30 days do not join the pool. A sale on 1 July that is bought back on 31 July is still inside the 30 days: the new shares are matched to the sale, and the old pool stays put.

HMRC’s CRYPTO22255 uses the same order. Someone already holds 14,000 tokens that cost £200,000, sells 4,000 on 30 August for £160,000, and buys 500 on 11 September for £17,500. The 500 match the new buy. The other 3,500 come out of the pool at £200,000 × 3,500 / 14,000, which is £50,000. The gain is £92,500. The pool left is 10,500, still costing £150,000. The manual writes the year as 20XX. Load that example on this page. A longer note is how capital gains tax works on shares.

Reliefs this page will and will not apply

Business Asset Disposal Relief is 18% from 6 April 2026, on up to £1 million of qualifying gains over a lifetime. The page caps the relief at the limit still left and taxes the excess at the ordinary rates. It does not test the qualifying conditions. You say that the gain qualifies, and how much relief you have already used.

Shares in an ISA or a PEP, and investments held for a registered pension scheme, are outside Capital Gains Tax. Carried interest from 6 April 2026 is Income Tax and National Insurance. A gain on your main home is usually covered by Private Residence Relief. None of those is calculated here.

Sources for 2026/27

Rates were reviewed on 8 October 2026. Email hello@oddjobby.co.uk if a figure looks out of date.

Questions

Do residential property and shares use different rates this year?

No. For disposals from 6 April 2026 the Capital Gains Tax rates page charges 18% and 24% on gains. It does not publish a separate residential pair.

Why might a brought-forward loss be left unused?

It is used only to bring the gains down to the £3,000 annual exempt amount. The rest stays available for a later year. A loss made in the same tax year is deducted even when that uses up the exempt amount.

Related tools