RE: Off Topic. Weekend6 Mar 2021 16:25
Timydogy,
On my reading of the "30-day rule", on the transaction on 5 Mar 2021 in your example you have not made a gain in tax year 2020/2021, but a very large loss. The 10,000 shares you sold on 5 March , for proceeds of £19,990, have to be matched against the 10,000 you bought on 21 March, at a total cost of £30,160. So you made a loss of £10,170. If you've already exceeded your CGT allowance for this tax year, unless you've exceeded it by more than £10,170, this loss will eliminate any CGT liability for the year.
If all your other gains for this year totalled less than £10,170 (which presumably *won't* be the case because you say you've already used up your CGT allowance), then overall you'd still have an overall net capital loss for the year which you can claim, and also carry forward for a number of years.
10,000 shares at the *original* cost (£10,060) go forwards as the Section 104 holding, so if/when you sell any shares of X in the future, these are what you'd have to match that sale to.
Regards,
Mike.