Capital Gains Tax if selling shares or investments

Capital Gains Tax (CGT) is a tax on the profit you make when you sell or dispose of an asset. Importantly, it only applies when that asset has increased in value. Moreover, it is the gain itself that is taxed, not the total amount you receive.

For example, imagine you buy shares for £3,000 and later sell them for £8,000. In that case, the taxable gain is £5,000, not the full sale price.

When CGT applies

Generally, you must consider Capital Gains Tax if selling shares or investments that have grown in value. However, a ‘disposal’ covers more than just a straightforward sale. Specifically, it includes:

• Selling an asset
• Gifting it to someone else
• Exchanging it for another asset
• Receiving compensation, for example through an insurance payout

In addition, if you jointly own investments, you only pay tax on your share of any gain.

Assets that are usually exempt

Thankfully, not every investment falls within the CGT net. Indeed, several common assets and gains are generally exempt, including:

• Investments held within ISAs or PEPs
• UK government gilts
• Premium Bonds
• Gambling winnings
• Carried interest (from 6 April 2026)

As a result, careful planning around tax-efficient wrappers can make a real difference.

Your annual tax-free allowance

Furthermore, you only pay tax on total gains above your annual tax-free allowance. Currently, this allowance sits at £3,000. However, if your gains exceed it, you must report and pay CGT.

Typically, you do this by filing a self-assessment tax return. That said, reporting deadlines vary depending on the type of asset you sold or gifted.

How much CGT will you pay?

Next, the rate you pay depends on your overall income. Broadly, the rates work as follows:

• Basic rate taxpayers pay 18% on gains within the basic rate band
• Basic rate taxpayers pay 24% on amounts above that band
• Higher and additional rate taxpayers generally pay 24% on all gains

Consequently, your wider income position can significantly affect your final bill.

Reducing your CGT bill

Fortunately, several strategies can help reduce the amount you owe. For instance, you can offset losses on investments against your gains. In addition, other reliefs may also be available depending on your circumstances.

Therefore, good record-keeping is essential. Make sure you keep clear records of:

• Original purchase costs
• Sale proceeds
• Associated fees, such as broker charges

Ultimately, accurate records help you calculate the correct taxable amount and avoid overpaying.

Plan ahead before you sell

Finally, timing matters. By planning disposals carefully, you can make full use of your allowance each year. Moreover, spreading gains across tax years can sometimes reduce your overall liability. So, before making any major moves, it pays to take advice.

Need help with Capital Gains Tax?

Our team can guide you through the rules on Capital Gains Tax if selling shares or investments. Get in touch today to discuss your situation and plan your next steps with confidence.