When calculating Capital Gains Tax (CGT) in the UK, certain expenses related to the acquisition, improvement, and sale of the asset can be deducted from the gain, effectively reducing the amount of tax owed. These deductions are crucial for ensuring you don’t overpay. Here’s a detailed guide on what expenses you can deduct:
1. Acquisition Costs
These are the expenses incurred when you initially purchase the asset. Examples include:
- Purchase Price: The amount you paid to acquire the asset.
- Stamp Duty Land Tax (SDLT): For properties, any stamp duty paid at the time of purchase can be deducted.
- Legal Fees: Costs incurred for solicitors or conveyancers during the purchase process.
- Survey Fees: If you paid for a survey to assess the property before buying, this cost is deductible.
2. Improvement Costs
Expenses related to making significant improvements to the asset can also be deducted, provided they add value to the property or asset and are capital in nature. Examples include:
- Structural Enhancements: Extensions, loft conversions, or new kitchens and bathrooms.
- Renovations: Repairs that upgrade the asset’s value (e.g., replacing a roof or adding insulation).
- Planning Permission Costs: Fees paid for securing planning permission for improvements.
- Professional Fees: Architect or surveyor fees related to the improvement work.
Note: Routine maintenance or repair costs, such as repainting or fixing broken items, cannot be deducted as they are considered revenue expenses rather than capital expenses.
3. Selling Costs
When you sell the asset, the following expenses can be deducted:
- Estate Agent Fees: If you used an agent to sell the property, their fees are deductible.
- Legal Fees for Sale: Solicitor or conveyancer costs during the sale process.
- Advertising Costs: Any money spent on advertising the property or asset for sale.
- Auctioneer Fees: If the asset was sold at auction, these fees can be deducted.
4. Costs Associated with Transfer of Ownership
Expenses incurred to transfer the ownership of an asset may also be deducted. Examples include:

- Valuation Fees: If you needed a professional valuation as part of the sale.
- Costs of Resolving Legal Disputes: Fees for resolving ownership issues or disputes before selling.
5. Costs of Gifting an Asset
If you gifted an asset (e.g., to family), the market value at the time of the gift is used for CGT calculations. However, you can still deduct related expenses, such as valuation fees or legal costs, associated with transferring ownership.
6. Investment-Related Expenses
For non-property assets like shares or investments, allowable expenses include:
- Brokerage Fees: Costs of buying and selling shares.
- Stamp Duty on Shares: If you paid stamp duty when acquiring the shares.
- Financial Advisor Fees: Fees for professional advice related to the purchase or sale of the investment.
7. Costs Related to Settling an Asset’s Debt
If you had to pay off a loan or mortgage as part of selling the asset, the associated early repayment fees or legal costs may be deductible.
8. Other Miscellaneous Costs
In some cases, additional expenses may qualify for deduction, such as:
- Costs of Insurance Policies: For protection related to the asset’s sale or transfer.

- Specialist Fees: For rare or unique assets, any costs to verify authenticity or conduct due diligence.
Important Notes on Deductions
- Keep Receipts and Documentation: HMRC requires proof for all deductible expenses. Maintain records, receipts, and invoices to validate your claims.
- Only Deduct Capital Costs: Revenue costs (e.g., day-to-day maintenance or operational costs) cannot be deducted.
- Partial Deductions: If the expense applies only partially to the asset, you can deduct the proportion that relates directly to the asset’s acquisition, improvement, or sale.
- Claiming Costs for Joint Ownership: If the asset is jointly owned, expenses must be split proportionately between the owners.
Example Calculation
Let’s say you sold a property for £400,000, which you originally purchased for £250,000. You incurred the following costs:
- Stamp Duty: £7,500
- Legal Fees (Purchase): £1,000
- Renovation: £20,000
- Estate Agent Fees: £4,000
- Legal Fees (Sale): £1,200
Your taxable gain would be:
Selling Price (£400,000) – Purchase Price (£250,000) – Allowable Expenses (£33,700) = £116,300
This gain would then be subject to the applicable CGT rates after applying the Annual Exempt Amount (currently £6,000 for the 2024/25 tax year).
Conclusion
Understanding which expenses can be deducted when calculating CGT is vital for ensuring you pay only the tax owed. Keep thorough records of all acquisition, improvement, and selling costs to reduce your taxable gains. If in doubt, consult with a tax advisor to ensure compliance and maximize your deductions.