RE: Tax Man11 Feb 2020 12:38
CGT is only incurred (in a share trading account/not ISA/SIPP etc..) on a chargeable event = sale of share (would include sale of company, as shares are then sold).
At that time point you have a charge.
Whatever profits you make (ie..less costs in buying) are chargeable.
Knock off £12k tax free annual allowance, knock off any CGT losses incurred in prior years (these must be registered with taxman for those years (i believe you can go back 4 yrs here to complete old loss making returns) the remaining figure is taxed.
10% on that element considered lower rate, 20% on element considered high rate.
Given the tax year ends 5th April it maybe possible to stagger your sale over 2 tax years & gain 2x 12k allowances & 2x Lower rates.