The purpose of this site is to help UK tax payers to calculate, and to keep track of, their capital gain (or loss) based on their share trades. This is important for effective tax planning and can potentially save you a significant amount on your tax bill. To use the capital gains calculator simply store your trades in a spreadsheet, or a simple text editor like Notepad, in a simple format.

Anyone who has tried working through the Inland Revenue matching rules for share trades will know that the process can quickly become very complicated. This is especially true if you have made more than a couple of dozen or so trades, if you have taper relief to take into account or if one or more of your shares has changed status from a business asset to a non-business asset (or vice versa!) during the period of ownership. This calculator will make it easy.

Capital gains tax rules for the 2010-2011 tax year. Note that all capital gains (after exemption has been applied) before 24/06/2010 are taxed at 18%. After this date the rate rises to 28% for higher rate tax payers. Use this tax calculator for the 2010-2011 tax year.

Last updated January 2012