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If you make a cpaitla gain in excess of the gains allowance, then the excess is chargeable to CGT. It is not the value of the share or sales proceeds but the gain made.
The tax office would not communicate with you for payment unless you have completed the relevant section on your tax return to report the chargeable gain.
You need to establish what the gain was when you exercised your shares option.
If the gain is in excess of the gains allowance then you need to report it to the tax office.
I will be able to tell you what the threshold is if you provide me with details of gain and tax year the sale took place.
I hope this is helpful and answers your question.
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Capital gains allowance for tax year 2012-13 was £10,600.
Provided your sale proceeds did not exceed £42,400 and the gain was less than £10,600 you don't have to report the gain to HMRC.
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