How does capital gains tax in the UK work? A beginner's explanation

By FastBuySale Newsroom · 5 Nov 2026 · 16m ago

What do you pay capital gains tax on in the UK?

Capital gains tax in the UK is a tax on the profit when you sell or otherwise dispose of something that has increased in value. official UK government guidance stresses that it is the gain that is taxed, not the amount of money you receive. Its own example: buy a painting for £5,000, sell it later for £25,000, and your gain is £20,000.

The short answer for beginners: add up the gains you made in the tax year (6 April to 5 April), deduct allowable losses, and you only pay tax on what is left above the annual tax-free allowance, called the Annual Exempt Amount, which is £3,000 for individuals and £1,500 for trusts. Basic rate taxpayers pay 18% on the portion that fits inside their basic rate band, and anything above that, or any gain made by a higher or additional rate taxpayer, is taxed at 24%.

official UK government guidance lists the main 'chargeable assets'. You pay capital gains tax on the gain when you dispose of: most personal possessions worth £6,000 or more, apart from your car; property that is not your main home; your main home if you have let it out, used it for business or it is very large; any shares that are not in an ISA or PEP; business assets; and cryptoassets.

Disposing does not only mean selling. official UK government guidance says it includes giving an asset away as a gift or transferring it to someone else, swapping it for something else, and getting compensation for it, such as an insurance payout if it is lost or destroyed. Beginners are often surprised that a gift of shares to an adult child can create a taxable gain even though no money changed hands.

Some gains are tax-free. official UK government guidance says you do not pay capital gains tax on gains from ISAs or PEPs, UK government gilts and Premium Bonds, or betting, lottery or pools winnings. From 6 April 2026 carried interest is taxed through Income Tax and National Insurance instead. You do not usually pay tax when you sell the home you live in, thanks to relief for a main home.

Jointly owned assets are split: if you dispose of something you own with someone else, you pay capital gains tax on your share of the gain. Overseas assets can also be taxable for UK residents, and non-residents still pay on gains from UK property and land.

Inherited assets work differently. When you inherit, Inheritance Tax is usually paid by the estate. official UK government guidance says you only need to work out whether capital gains tax applies if you later dispose of the asset yourself.

Practical tip: holding shares and funds inside an ISA keeps future gains outside capital gains tax altogether. Read our beginner's guide to the Cash ISA at and the Lifetime ISA at to compare wrappers.

How are capital gains tax rates worked out?

From 6 April 2026, official UK government guidance says higher and additional rate taxpayers pay 24% on their gains. For basic rate taxpayers, the rate depends on the size of the gain and their taxable income, so there are four steps.

Step 1: work out your taxable income, which is your income minus your Personal Allowance and any other Income Tax reliefs. Step 2: work out your total taxable gains. Step 3: deduct the £3,000 tax-free allowance. Step 4: add what is left to your taxable income. Any part that falls within the basic rate band is taxed at 18%; any part above it is taxed at 24%.

Worked example 1 (official UK government guidance): taxable income of £20,000 and taxable gains of £12,600. Deduct the £3,000 allowance, leaving £9,600. Added to income that makes £29,600, which is below the £37,700 basic rate band for 2026 to 2027, so all of it is taxed at 18%. The bill is £1,728.

Worked example 2 (official UK government guidance): the same £20,000 income but gains of £52,600. After the allowance, £49,600 is taxable. Income plus gains comes to £69,600, above £37,700. So £17,700 is taxed at 18% and the remaining £31,900 at 24%, a total of £10,842.

Notice how the band works: in example 2 only £17,700 of gains fits inside the basic rate band (£37,700 minus £20,000 of income). Spreading disposals across two tax years can mean using two allowances and more of the lower band each time, which is a legitimate planning point many beginners miss. Use our to estimate your taxable income first.

Different rates may apply to some business disposals, and trustees and personal representatives have their own rules, so check official UK government guidance if either applies to you.

How do losses, gifts and allowances reduce the bill?

Losses: official UK government guidance says you can report losses on a chargeable asset to HMRC to reduce your total taxable gains. A loss is first deducted from gains in the same tax year. If your gains are still above the allowance, unused losses from earlier years can be deducted too, and anything left can be carried forward. You can claim a loss up to 4 years after the end of the tax year in which you disposed of the asset.

Worthless assets: you can claim a loss on an asset you still own if it has become worthless or of 'negligible value', using HMRC's negligible value claim process.

Gifts to a spouse or civil partner: you do not pay capital gains tax on assets you give or sell to your husband, wife or civil partner, unless you were separated and did not live together at all in that tax year, or you gave them goods for their business to sell on. Your partner may pay tax when they later dispose of it, based on the value when you first owned it, so keep a record of what you paid.

Gifts to charity: no capital gains tax is due on assets you give to a charity. If you sell to a charity for more than you paid but less than market value, your gain is based on what the charity actually pays.

Family and 'connected people': you usually cannot deduct a loss on a disposal to a family member or other connected person, such as a business partner or a company you control, unless you are offsetting a gain from the same person.

Keep records of purchase prices, costs and dates. Gains are measured in pounds, not in real terms, so long holding periods can produce large nominal gains; see how prices change over time with our and model growth with the

When and how do you report and pay?

UK residential property: if you sold a UK residential property with a completion date on or after 27 October 2021 and have tax to pay, official UK government guidance says you must report and pay within 60 days, using a Capital Gains Tax on UK property account. Do not wait for your next tax return, or you may pay interest and a penalty.

Other gains: report in the tax year after the disposal through a Self Assessment tax return. If you are eligible, the 'real time' Capital Gains Tax service lets you report by 31 December in the tax year after the sale.

Below the allowance but big sales: even if your gains are under £3,000, if you are registered for Self Assessment you must report gains on your return when the total amount you sold assets for was more than £50,000 (for 2023 to 2024 onwards). For earlier years the limit was 4 times the allowance.

Non-residents must report all sales of UK property or land, residential and non-residential, even when there is no tax to pay or they made a loss.

A simple yearly routine: list every disposal with dates, proceeds and costs; total gains and losses; compare with the £3,000 allowance; check whether sale proceeds passed £50,000; and diary the 60-day deadline the day a property sale completes. For more on returns, see

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