Reporting Capital Gains on Your Self Assessment

Capital Gains Tax (CGT) applies when you sell or dispose of an asset that has increased in value. If you are already in Self Assessment, you report capital gains on your return.

What Triggers CGT

You may owe CGT when you sell:

• A second property (not your main home)
• Shares and investments
• Business assets
• Valuable personal possessions worth over £6,000
• Cryptocurrency

Your main home is usually exempt under Private Residence Relief.

The Annual Exempt Amount

For 2026/27, the annual CGT exempt amount is £3,000. You only pay CGT on gains above this threshold.

CGT Rates (2026/27)

| Asset type | Basic-rate taxpayers | Higher/additional-rate taxpayers | |-----------|---------------------|-------------------------------| | Most assets | 18% | 24% | | Residential property | 18% | 24% |

Business Asset Disposal Relief (formerly Entrepreneurs' Relief) may apply to qualifying business assets, with a 10% rate on gains up to the lifetime limit.

Reporting on Self Assessment

Include capital gains on the capital gains supplementary pages of your return. Report each disposal separately with:

• Description of the asset
• Date of acquisition and disposal
• Proceeds (sale price)
• Allowable costs (purchase price plus improvement costs)
• The gain or loss

Property Disposals

If you sell UK residential property, you must report and pay CGT within 60 days of completion. This is in addition to including it on your Self Assessment return.

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