March 20, 2026
Capital gains tax (CGT) is a UK tax you may pay when you make a profit from selling or disposing of certain UK assets such as shares, property, or other investments. It applies to the increase in value (your capital gains) rather than the total amount you receive.
If you’re a UK resident, understanding how capital gains tax works can help you plan, manage your tax bill, and make more informed decisions about your money. This guide explains how capital works in plain English, when CGT applies, and how to manage your gains efficiently.
Capital gains tax is charged on the gains you make when you dispose of an asset for more than you paid for it. In personal finance, capital refers to the value you hold in assets such as property, shares, or other investments.
Capital gains arise when the value of an asset increases over time, and you sell or transfer it for a higher amount than your original purchase price. This difference is your taxable gains, which may create a CGT liability depending on the rates and allowances available to you in that tax year.
You may need to pay capital gains tax on a range of UK assets, including:
A disposal includes selling, gifting, or transferring ownership of an asset. In some cases, exchanging assets or receiving compensation can constitute a disposal.
Some assets are exempt from CGT. For example, assets held within an ISA or pension are typically outside the scope of CGT, and certain personal possessions may also be exempt.
Calculating gains after a disposal
Your gains are usually calculated as the sale price minus the purchase price and allowable costs. Allowable costs may include legal fees, improvement costs, and selling expenses.
Once calculated, your taxable gains are added to your income and capital gains for the tax year to determine how much CGT you owe under the current CGT rates.
The amount of capital gains tax you pay depends on:
Different rates apply depending on your income band and the asset type. Scottish taxpayers and Welsh taxpayers follow UK-wide CGT rules, although income tax bands differ in Scotland and can affect how much of your gains fall into higher tax bands.
Each tax year, you may benefit from a free allowance, also known as the exempt amount. This means you can make a certain level of capital gains before CGT applies.
Understanding the rates and allowances available can help reduce your tax bill. Planning disposals across tax years—including into the next tax year—may allow you to use more than one free allowance over time.
CGT is reported and paid after a disposal within specific deadlines. In general, this would usually be reported as part of your self assessment for the tax year in which the disposal occurs. This differs from residential property, where you must report and pay the CGT within 60 days of completion of the sale
Missing deadlines can increase your tax bill, so it’s important to keep accurate records and understand your responsibilities under UK tax rules and taxation requirements. HMRC’s online tax service can be used to report and pay CGT.
There are several reliefs that may reduce your CGT liability, including the following:
These reliefs can significantly reduce your CGT exposure when conditions are met, particularly for business owners and those disposing of qualifying assets.
Financial advice for managing capital gains
Careful planning can help manage capital gains tax effectively. This may include:
Professional financial advice can provide clarity on how CGT fits into your broader financial planning, helping you balance today’s benefits with your long-term goals.
CGT does not usually apply at death, but assets may form part of your estate for Inheritance Tax purposes. When assets are later sold by beneficiaries, CGT may apply based on their value at the time of inheritance.
Gifts to family members can trigger CGT in some circumstances, even where no money changes hands. Some transfers may be exempt from CGT, depending on the situation and applicable reliefs.
Common questions about capital gains
Do I pay CGT if I reinvest?
Reinvesting does not automatically remove CGT. Your liability depends on the disposal and whether reliefs apply.
Do I pay CGT on my main home?
Your main home is often covered by Private Residence Relief and may be exempt from CGT, subject to conditions.
What records should I keep?
Keep purchase documents, improvement costs, and disposal details to support your CGT reporting.
Managing capital and gains effectively is about planning ahead. Keeping clear records, understanding your tax rules, and reviewing your position each tax year can help you avoid surprises.
If your circumstances are changing, for example, selling property, restructuring investments, or planning for your estate, professional guidance can help ensure your decisions support your long-term goals and minimise unnecessary taxation.
If you’re planning a disposal or reviewing your investments, tailored financial advice can help you understand your capital gains tax position and plan with confidence. Speak with an adviser to explore your options and take the next step toward a more secure financial future.
"*" indicates required fields
