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Calculating Capital Gains Tax Due on Account with hundreds of buys.

I have an online share account which was purchasing shares every month for several decades, so there have been hundreds of buys throughout that time.

For the first time I am going to sell some, but not all of the shares.

When calculating the cost of the shares, is it permissible to use the average cost of all the shares that I have bought. ?

Also, do I need to do a HMRC return even if the profit figure is below the threshold ?


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