UK Capital Gains Tax Calculator: Estimate Your Property Gains

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Easily calculate your capital gains tax on UK property sales with this guide. Discover tax-free allowances and expert tips from Fraser Bond.

If you're looking to calculate Capital Gains Tax (CGT) in the UK, here's a basic breakdown of how it works and how you can calculate your tax liability. Keep in mind that while online capital gains tax calculators can offer estimates, it’s important to consider personal circumstances or consult with professionals, such as Fraser Bond, for more accurate guidance.

Key Factors in Capital Gains Tax Calculation

  1. Tax-Free Allowance (Annual Exempt Amount)
    As of the 2023/2024 tax year, individuals are entitled to a tax-free CGT allowance of £6,000. This amount will reduce to £3,000 in 2024/2025. Any gains up to this limit are exempt from tax.

  2. Capital Gain Calculation
    A capital gain is the difference between the selling price of the asset and its original purchase price, minus any allowable expenses (e.g., legal fees, agent fees, or improvement costs).

    • Capital Gain = Sale Price - Purchase Price - Allowable Expenses
  3. Applicable CGT Rate
    The rate at which CGT is charged depends on your income tax band and the type of asset being sold.

    • For residential property:
      • 18% for basic rate taxpayers
      • 28% for higher/additional rate taxpayers
    • For other assets (e.g., stocks, businesses, etc.):
      • 10% for basic rate taxpayers
      • 20% for higher/additional rate taxpayers

    Note: If the capital gain pushes your income into a higher tax bracket, you may pay different rates on different portions of the gain.


Example Calculation

Let’s walk through a simple calculation using a residential property as an example.

  • Original Purchase Price: £200,000
  • Selling Price: £300,000
  • Allowable Expenses: £5,000 (e.g., legal fees, agent costs)
  • Capital Gain: (£300,000 - £200,000 - £5,000) = £95,000
  • Annual Exempt Amount: £6,000
  • Taxable Gain: £95,000 - £6,000 = £89,000

Assume you're a higher-rate taxpayer, so the applicable CGT rate on residential property is 28%.

  • Tax Payable: £89,000 x 28% = £24,920

Factors That Can Affect Your CGT

  • Marital Status: You can transfer assets between spouses without triggering CGT, which can help in tax planning.
  • Private Residence Relief: If you’re selling your main home, you may be eligible for Private Residence Relief, which could reduce or eliminate your CGT liability.
  • Other Reliefs: Entrepreneurs’ Relief and Investors’ Relief may apply in specific cases, lowering the CGT rate on certain business assets to 10%.

CGT Calculator Tools

You can use online CGT calculators to get an estimate of your capital gains tax. The UK government also provides a CGT calculator on the HMRC website, which can help you calculate the tax due based on your specific transaction.

For complex cases, such as dealing with multiple properties, foreign assets, or business disposals, professional advice is often necessary. Fraser Bond can assist you with property sales and capital gains tax planning to ensure you are maximising your tax efficiency.


For more personalized advice on capital gains tax and how it applies to your property investments, get in touch with Fraser Bond today. We’re here to help you navigate the complexities of the UK property tax system.