Investing is one of the most effective ways to grow your wealth over time, but the returns you make can be subject to tax. Understanding the basics of how investment taxes work in the UK can help you plan more effectively and make sure you are not paying more than you need to.
Capital Gains Tax
When you sell an investment for more than you paid for it, the profit you make is known as a capital gain. Capital Gains Tax (CGT) is charged on that gain, not on the full amount you receive. Every individual has an annual CGT allowance, which in 2025/26 is £3,000. Gains below this threshold are tax-free. Above it, the rate you pay depends on your income tax band and the type of asset.
Unlike income tax, CGT is not deducted automatically. You are responsible for reporting gains to HMRC, usually through a self-assessment tax return. Failing to report accurately can result in penalties that outweigh the original tax owed, so it is important to keep good records.
Dividend Tax
If you own shares in a company, you may receive dividends, which are payments made from company profits. For the 2025/26 tax year, the first £500 of dividend income is covered by your dividend allowance and is tax-free. Above that, dividend tax rates are 8.75% for basic rate taxpayers, 33.75% for higher rate taxpayers, and 39.35% for additional rate taxpayers.
It is worth noting that dividends received within an ISA or pension are free from dividend tax entirely, which is one of the reasons these wrappers are so valuable for investors.
Interest Tax
If you earn interest on savings accounts or bonds, this is also potentially taxable. The Personal Savings Allowance lets basic rate taxpayers earn up to £1,000 in interest tax-free each year, while higher rate taxpayers can earn up to £500 tax-free. Additional rate taxpayers do not receive a Personal Savings Allowance and pay tax on all savings interest above what is sheltered in an ISA.
The role of ISAs
Individual Savings Accounts (ISAs) are one of the most straightforward ways to reduce your investment tax bill. Any growth, dividends, or interest earned within an ISA is completely free from UK tax. In 2025/26 you can save up to £20,000 per tax year across your ISAs. The main types relevant to investors are Cash ISAs, Stocks and Shares ISAs, and Innovative Finance ISAs.
Using your ISA allowance each year is one of the simplest and most effective tax planning steps available to most people.
A few things to keep in mind
Tax rules on investments can change from year to year, and the amount you owe depends on your individual circumstances, including your total income and which types of accounts your investments are held in. What applies to one person may be quite different for another.
If you are unsure about your tax position on investments, speaking to a financial adviser or tax specialist is a sensible step. Good advice can help you make the most of available allowances and structure your investments in the most tax-efficient way.
The value of investments can fall as well as rise, and you may not get back what you originally invested. Tax treatment depends on individual circumstances and may be subject to change. Tax planning is not regulated by the Financial Conduct Authority.
Approved by In Partnership FRN 192638 June 2026
