Capital Gains Tax on UK Shares: Rates, Allowances, Thresholds, and How It Works

Capital gains tax on UK shares is an important consideration for individuals who sell or otherwise dispose of shares outside tax-advantaged arrangements. When shares have increased in value since acquisition, the resulting gain may be subject to UK Capital Gains Tax (CGT), depending on the individual's circumstances, available allowances, losses, and applicable reliefs.

For the 2026/27 UK tax year, the main Capital Gains Tax rates for individuals are 18% and 24% for most chargeable assets, including shares. The rate that applies depends largely on the individual's taxable income and the amount of the taxable gain. The annual exempt amount for individuals is £3,000.

Understanding the capital gains tax rate on shares UK, the capital gains tax allowance on shares UK, and the capital gains tax threshold shares UK can help investors understand when a disposal may create a tax liability and how gains are calculated.

What Is Capital Gains Tax on UK Shares?

Capital Gains Tax is a tax on gains made when certain assets are disposed of for more than their allowable cost.

Shares are generally chargeable assets when they are held outside tax-advantaged accounts such as an ISA. HMRC specifically identifies shares that are not held in an ISA or certain other protected arrangements as assets that can be subject to CGT.

A disposal can include:

• Selling shares for cash
• Giving shares to another person
• Transferring shares in certain circumstances
• Other transactions treated as disposals for CGT purposes

The tax generally applies to the gain, rather than the total amount received from selling the shares.

For example, if an investor buys shares for £20,000 and later sells them for £30,000, the starting point for the CGT calculation is a £10,000 gain, before considering allowable costs, losses, reliefs, and the annual exempt amount.

Understanding the definition of Capital Gains Tax on UK Shares

How Is Capital Gains Tax on Shares Calculated?

The basic calculation involves determining the gain on the shares and then applying the relevant deductions and tax rates.

A simplified calculation is:

Sale proceeds − allowable acquisition costs − allowable disposal costs = capital gain

The resulting gains are then considered alongside other capital gains and allowable capital losses for the tax year.

A simplified example:

• Purchase price: £20,000
• Sale proceeds: £35,000
• Allowable transaction costs: £500
• Capital gain: £14,500

If the investor has no other gains or losses, the £14,500 gain would then be reduced by the applicable annual exempt amount before CGT is calculated.

For the 2026/27 tax year, an individual has a £3,000 annual exempt amount, leaving £11,500 potentially taxable in this example.

The actual tax payable then depends on the individual's taxable income and the applicable CGT rate.

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Capital Gains Tax Rate on Shares UK

The capital gains tax rate on shares UK depends on the individual's circumstances.

For the 2026/27 tax year, the main rates for individuals are:

This proportion depends on the investor's income and the extent of the gain.

Capital Gains Tax Allowance on Shares in the UK

The capital gains tax allowance on shares in the UK is commonly referred to as the Annual Exempt Amount (AEA).

For individuals, the Annual Exempt Amount is £3,000 for the 2026/27 tax year.

This means that an individual can generally make up to £3,000 of overall taxable capital gains in the tax year before CGT becomes payable, after taking into account allowable losses and other applicable rules.

The £3,000 amount applies to the individual's overall qualifying capital gains, not £3,000 for every individual shareholding.

For example, if an investor makes:

• £2,000 gain on Company A shares
• £4,000 gain on Company B shares

The combined gain is £6,000 before deductions and losses. The annual exempt amount applies to the overall position rather than giving the investor a separate £3,000 allowance for each investment.

The Annual Exempt Amount Is Not a Per-Share Allowance

This is an important distinction for investors with diversified portfolios.

The allowance is generally applied to total relevant gains for the tax year. It is not:

• £3,000 per company
• £3,000 per transaction
• £3,000 per brokerage account
• £3,000 per stock exchange

An investor who sells multiple shareholdings during the same tax year needs to consider the combined capital gains position.

=> Learn more: United Kingdom Company Formation

Capital Gains Tax Threshold Shares UK

The phrase capital gains tax threshold shares UK can be misleading because the UK does not have a single share-specific CGT threshold at which all gains suddenly become taxable.

Instead, there are several figures that investors need to distinguish.

Annual Exempt Amount

For 2026/27, the Annual Exempt Amount for individuals is £3,000. Gains above the available allowance can become subject to CGT after relevant losses and reliefs are considered.

Income Tax Basic-Rate Band

The CGT rate can also depend on how much of the individual's basic-rate Income Tax band remains available.

For 2026/27, the basic-rate band is £37,700 for England, Wales, and Northern Ireland.

This is not a CGT allowance. Instead, it helps determine whether a taxable gain falls at 18% or 24%.

Share Sale Value Is Not the Same as the CGT Threshold

Another common misunderstanding is assuming that CGT depends on how much an investor receives from selling shares.

The CGT calculation is generally based on the gain, not simply the gross sale proceeds.

For example, selling shares for £100,000 does not automatically mean that £100,000 is subject to CGT. If the allowable acquisition cost was £80,000, the initial gain would be £20,000 before other deductions.

UK's 2023/2024 tax-free capital gains allowance is £12,300.

Are Shares Held in an ISA Subject to Capital Gains Tax?

Shares and investments held within an Individual Savings Account (ISA) benefit from specific tax treatment.

HMRC states that you do not pay tax on dividends from shares held in an ISA, and shares that are not in an ISA are among the assets that can be subject to CGT.

Therefore, investors should distinguish between:

• Shares held in an ISA
• Shares held in a standard investment account
• Shares held through other tax-advantaged arrangements
• Shares held personally outside such arrangements

The tax treatment can differ substantially depending on the account and investment structure.

How Capital Losses Can Reduce CGT on Shares

Capital losses can be important when calculating CGT.

If an investor sells one investment at a gain and another at a loss, the allowable loss may be available to offset gains, subject to the relevant UK rules.

For example:

• Gain on Share A: £12,000
• Loss on Share B: £4,000
• Net gain: £8,000

The investor would then consider the £3,000 Annual Exempt Amount for 2026/27, leaving £5,000 potentially subject to CGT before applying the relevant rate.

HMRC's calculation process generally involves adding gains from relevant disposals and deducting allowable losses before applying the annual exempt amount.

Investors should also keep records of losses because they may be relevant to future tax years under the applicable rules.

Capital Gains Tax on UK Shares for Non-Residents

UK CGT treatment can differ depending on whether the investor is UK resident or non-resident.

Non-residents should not assume that simply holding shares in a UK company automatically creates a UK CGT liability on disposal.

HMRC states that non-residents generally do not pay UK CGT on other capital gains, although specific rules and exceptions apply, including rules concerning UK property and land.

Residence status, temporary non-residence rules, the type of asset, and the individual's circumstances can therefore be important.

For international investors, the analysis may also involve the tax rules of the investor's country of residence and any applicable tax treaty.

UK's Capital Gains Tax Calculator aids proactive tax planning

How to Reduce Capital Gains Tax on UK Shares

There are several legitimate ways investors may manage their exposure to CGT, although the appropriate approach depends on individual circumstances.

Use Tax-Advantaged Investment Accounts

Holding eligible investments within an ISA can provide a different tax treatment from holding shares in a standard taxable investment account.

Consider the Annual Exempt Amount

For 2026/27, the individual Annual Exempt Amount is £3,000. Investors should understand how their total gains interact with this allowance rather than treating it as a separate allowance for each investment.

Keep Track of Capital Losses

Allowable losses can potentially offset gains, reducing the amount exposed to CGT.

Consider Timing

Where commercially appropriate, the timing of disposals can affect which tax year a gain falls into and how the gain interacts with the individual's other income and gains.

However, investment decisions should not be based solely on tax considerations.

Review Available Reliefs

Some transactions may qualify for specific CGT reliefs, but eligibility depends on detailed statutory conditions.

Professional tax advice can be useful when dealing with large disposals, private company shares, business sales, or complex share reorganizations.

Worked Example of Capital Gains Tax on UK Shares

Consider an individual who sells shares during the 2026/27 tax year.

• Purchase cost: £30,000
• Sale proceeds: £50,000
• Allowable costs: £1,000
• Capital gain: £19,000
• Annual Exempt Amount: £3,000
• Taxable gain: £16,000

Assume the investor has £20,000 of taxable income and no capital losses.

For 2026/27, the basic-rate Income Tax band is £37,700. The investor therefore has £17,700 of unused basic-rate band before considering the taxable gain. The full £16,000 taxable gain could fall within the 18% CGT rate in this simplified example.

The illustrative CGT would therefore be:

£16,000 × 18% = £2,880

This is a simplified example. Actual calculations can differ because of income, allowable expenses, losses, share matching rules, reliefs, residence status, and other circumstances.

Disclaimer

This article is for general informational purposes only and does not constitute legal, tax, or financial advice. Readers should consult qualified professionals before making decisions about UK shares or Capital Gains Tax.