Capital Gains Tax UK Explained: Rates & Allowance (2026)

Capital Gains Tax (CGT) is a key part of the UK tax system that applies when individuals or businesses dispose of certain assets and make a gain. While it is commonly associated with property sales, CGT can also apply to shares, investments, and valuable personal possessions. As asset values have increased over time and tax allowances have reduced in recent years, more people are finding themselves affected by these rules.

Understanding how Capital Gains Tax works is important for anyone who owns assets that may be sold, transferred, or disposed of. The rules can vary depending on the type of asset, how it was used, and the individual’s overall financial position. This guide explains the fundamentals of CGT in the UK, including thresholds, rates, reporting requirements, and what has changed in recent years, in a clear and practical way.

What Capital Gains Tax Is

Capital Gains Tax is charged on the profit (or “gain”) made when an asset is disposed of. A disposal does not only mean selling an asset for cash; it can also include gifting it, exchanging it, or transferring ownership in certain situations.

The key point is that CGT is not based on the total sale value, but on the gain itself. This is generally calculated as the difference between what the asset cost originally and what it is worth at the point of disposal.

CGT exists to tax increases in wealth arising from asset growth rather than income. It sits alongside other taxes such as income tax and corporation tax but applies specifically to capital transactions.

Not all assets are subject to Capital Gains Tax. Certain items, such as personal belongings sold for less than a specific threshold, or assets held within tax-efficient wrappers like ISAs, may fall outside the scope. However, many commonly held assets, including second properties and shares held outside tax wrappers, are typically within scope.

Who Capital Gains Tax Applies To

Capital Gains Tax applies to individuals, trustees, and, in some cases, business owners. Companies do not pay CGT in the same way; instead, they pay corporation tax on chargeable gains.

For individuals, CGT generally applies when disposing of:

• Residential property that is not your main home
• Shares and investments held outside ISAs or pensions
• Business assets
• Valuable personal items above certain thresholds

Your main residence is often exempt due to Private Residence Relief, although this depends on how the property has been used over time.

There are also important considerations where assets are jointly owned. In these cases, each individual may have their own share of the gain and their own tax allowance.

CGT can also apply even if no money changes hands. For example, gifting an asset to another person is usually treated as a disposal at market value for tax purposes.

How Capital Gains Tax Works in Practice

In practical terms, Capital Gains Tax is calculated and reported when an asset is disposed of. The process typically involves identifying the gain, applying any available reliefs or allowances, and then determining the tax due.

The gain is broadly calculated by taking the disposal value and deducting the original purchase cost, along with certain allowable expenses such as improvement costs or transaction fees.

After calculating the gain, individuals can usually deduct an annual tax-free allowance, known as the Annual Exempt Amount. Any remaining gain is then taxed at the applicable CGT rate, which depends on the type of asset and the individual’s overall income.

The reporting process can differ depending on the asset. For example, residential property disposals often require reporting and payment within a short timeframe, whereas other gains are typically reported through a Self Assessment tax return.

In practice, this means that CGT is not something that arises continuously throughout the year, but rather at specific points when disposals occur.

Key Rules, Deadlines and Rates

Capital Gains Tax includes several important thresholds, rates, and deadlines that determine how it applies.

As of recent UK tax rules:

• The Annual Exempt Amount for individuals has been significantly reduced in recent years
• Gains above this allowance are taxable
• CGT rates differ depending on the asset type and income band

For residential property:

• Lower rate taxpayers are typically charged at a lower CGT rate
• Higher and additional rate taxpayers are charged at a higher CGT rate

For other assets such as shares:

• Rates are generally lower than those applied to property

Deadlines are also a critical part of the system:

• UK residential property gains must usually be reported and paid within 60 days of completion
• Other gains are reported via the Self Assessment tax return following the end of the tax year

Failure to meet reporting deadlines can result in penalties and interest, which is why timing is an important part of how CGT operates in practice.

Real-World Example

To understand how Capital Gains Tax works in a real-world context, consider a simple scenario.

An individual purchases a second property for £200,000. Several years later, the property is sold for £300,000. This results in a gain of £100,000 before considering any allowable costs or reliefs.

If the individual incurred legal fees, stamp duty, or improvement costs, these may be deducted from the gain. After these deductions, the remaining gain is then reduced by the annual CGT allowance.

The taxable portion of the gain is then subject to CGT at the relevant rate based on the individual’s income level.

While this is a simplified example, it illustrates how CGT focuses on the increase in value rather than the total sale proceeds.

What Has Changed in Recent Years

Capital Gains Tax has undergone several notable changes in recent years, which have increased its relevance for a wider group of taxpayers.

One of the most significant changes has been the reduction in the Annual Exempt Amount. This means that smaller gains that may previously have fallen below the threshold are now more likely to be taxable.

In addition, reporting requirements for residential property have become stricter, with shorter deadlines for declaring and paying tax.

There has also been increased alignment between CGT and income tax considerations, particularly when determining which rate applies to a gain.

These changes reflect a broader trend towards tightening the scope of CGT and increasing compliance requirements.

Common Issues and Challenges

Capital Gains Tax can present a number of practical challenges, particularly for individuals who do not deal with it regularly.

One common issue is identifying what qualifies as a disposal. Many people assume CGT only applies to sales, but it can also apply to gifts and transfers.

Another challenge is record keeping. Calculating a gain accurately requires details of the original purchase cost, associated expenses, and any improvements made over time. Without clear records, this process can become more difficult.

Timing is also important. The requirement to report property gains within a relatively short period can catch individuals off guard, particularly if they are unfamiliar with the rules.

Understanding which reliefs apply, such as those relating to main residences or business assets, can also be complex due to the conditions attached.

Getting Started

For those who may be affected by Capital Gains Tax, the starting point is understanding whether a disposal has occurred and whether the asset falls within scope.

This typically involves identifying the type of asset, reviewing how it has been used, and determining whether any exemptions or reliefs may apply.

Keeping accurate records of purchase costs, improvements, and sale details is an important part of this process, as these figures form the basis of the calculation.

It is also important to be aware of reporting deadlines, particularly for residential property transactions, where the timeframe is shorter than for other types of gains.

Capital Gains Tax is a tax on the profit made from disposing of certain assets, and it plays an important role in the UK tax system. While the concept is relatively straightforward, the rules around thresholds, reporting, and asset types can make it more complex in practice.

With reduced allowances and tighter reporting requirements, CGT is becoming increasingly relevant for a wider group of individuals. Understanding how it works, when it applies, and what needs to be reported is essential for staying compliant with UK tax rules.

Disclaimer

This article is for general informational purposes only and does not constitute financial, tax, or legal advice. Tax rules may change and individual circumstances can vary.