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  • Thanks. I am on the HMRC website and don't get it from reading their guide.
    However, looking at your comment, if you bought and resold instantly within 30 days (say in 2024), whenever you eventually close out the position, your original purchase price (say from 2002) prior to bed & breakfasting is the cost for Cgt purposes.

    I never knew this. Don't think I've ever triggered it but never been asked on a tax return done through accountancy if I did anything within 30 days that I can recall.

  • That is the relevant section: You have some existing shares with some cost basis then you sell some and buy some (a bit later). To calculate the gain you have to identify "which"
    shares you sold, done by the rules in that order. Equally, if you end up at the end with some shares remaining you need to calculate the new cost basis for those shares for when you need to calculate any gain the next time you sell.

    I suspect it is this latter that many get wrong.

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