About this guidance
This calculator will work out the Capital Gains Tax adjustment that needs to be included in your 2024-25 Self Assessment tax return for disposals of assets on or after 30 October where the rates changed.
Once you have worked out your Capital Gains Tax adjustment you will need to:
- save a copy of your results
- attach your results to your Self Assessment tax return
Make sure you have all the information you need before you start. You cannot save your progress.