Capital Gains Tax (CGT) Calculator UK 2025/26
Capital Gains Tax (CGT) is a tax on the profit made when you sell or transfer assets such as property, shares, or other investments that have increased in value. For the 2025/26 tax year in the UK, each individual has a tax-free allowance of £3,000. Any gain above this is taxed at different rates depending on your income, the type of asset, and your taxpayer status. This calculator helps you estimate your CGT liability based on the latest rules.
How to Use the CGT Calculator for Capital Gains Tax
- Choose the relevant asset type from the dropdown menu-select either “Residential Property” for property sales, or “Other Assets” for shares and investments.
- Enter the sale price, purchase price, and any allowable costs (such as legal fees or improvements) in the respective fields. These values should be in pounds sterling (£).
- Fill in your taxable income for the current tax year. This is your total income after deducting your Personal Allowance and any other Income Tax reliefs you are entitled to.
- Select the ownership type that applies to your situation-whether you are an individual, trustee, personal representative, or if the asset qualifies for Business Asset Disposal Relief.
- Click the “Calculate CGT” button. Your estimated Capital Gains Tax will be displayed prominently, along with a step-by-step explanation showing how the result was calculated and which tax rates were applied based on your inputs.