Understanding Capital Gains

Understanding capital gains is crucial when you sell assets like property, shares, or valuable personal items in the UK, as you may owe capital gains tax on the profit. This tax applies to individuals, trustees, and some companies, and knowing the rules can help you plan sales effectively and avoid unexpected bills.

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How Capital Gains Tax Works in the UK

Capital gains tax is charged on the profit you make when you sell or dispose of an asset that has increased in value. The gain is calculated by subtracting the original purchase price and allowable costs from the sale price. HMRC sets different tax rates based on your income tax band and the type of asset.

You only pay tax on gains above your annual tax-free allowance, which is £12,300 for individuals in 2025/26. If you're a higher or additional rate taxpayer, residential property gains are taxed at 28%, while other gains are at 20%. Basic rate taxpayers may pay 10% or 18%, depending on the asset and their income.

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What Assets Are Subject to Capital Gains Tax

Not all assets are taxable, and some have specific rules or exemptions. Here’s a comprehensive list of what you need to consider when understanding capital gains:

Residential property that isn't your main home, including second homes, buy-to-let properties, and inherited homes.
Shares and investments held outside of tax-efficient accounts like ISAs or pensions.
Business assets, such as machinery, goodwill, or shares in your own company when you sell them.
Personal possessions worth over £6,000, like art, antiques, or jewellery.
Cryptoassets, such as Bitcoin or Ethereum, when you dispose of them for a profit.
Land and non-residential property, including commercial buildings or plots of land.
Assets gifted to others, where the market value at the time of gift is used to calculate the gain.
Assets transferred as part of a divorce or separation, which may have special rules.
Foreign assets, where gains are still taxable in the UK, often with double taxation relief.
Assets held in trusts, where trustees are responsible for paying capital gains tax.

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Common Mistakes and When to Get Professional Help

A common mistake is forgetting to use your annual tax-free allowance or missing allowable costs like legal fees, which can reduce your gain. Also, people often assume their main home is always exempt, but if you've rented it out or used part for business, some gain might be taxable. Another error is not reporting disposals on time, which can lead to penalties from HMRC.

Keep detailed records of purchase prices, sale proceeds, and related costs for at least six years. If your situation is complex, such as with multiple asset sales, inheritance, or business disposals, consulting an accountant can ensure accurate calculations and identify reliefs like entrepreneurs' relief or gift hold-over relief.

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