For Fairy1 and JG68 - Further re CGT and 30-Day Rule13 Mar 2021 21:17
Hi again Fairy1 and JG68,
I've re-done my example, which is at the bottom of this post (if it all fits). It's got so complicated that there *might* be numerical errors in it, but hopefully not. Again, prices and numbers are fictional.
In terms of other comments, JG68 asks: "Do you have to report these transactions individually to HMRC on tax return or can you bulk report them after you have done all the calculations you described below?" My answer is I think it's best to list them all individually. That way HMRC can see you're not hiding anything, they can see how you got your answers (so avoiding further queries from them), and if it is wrong you'll get "free" education from them, for future use!
Also, JG68 says: "I think all gains under an ISA are tax free". That's right, all gains once the shares are in an ISA are tax-free, and so are all dividends from those shares. However, even when buying in an ISA, you still pay Stamp Duty (another kind of tax) each time you buy shares. I think that it *is* a good idea to keep a running record for each share as you go along. I do mine in "Excel". Hopefully for the frequent trading you do, online calculators will make life simpler, but I've never tried them myself. I think it's still important to understand the principles of the rules - that way (i) you can "sanity check" what the calculator is doing, and (ii) you can use the rules to your best advantage.
The new example:-
(a) 23 May 2020: Buy 1,000 BP @ £3-00.
(b) 3 Jun 2020: Buy 600 BP @ £4-60.
(c) Section 104 holding is now 1,600 BP at total cost £5,760.
(Average cost per share is £3-60).
(d) 5 Jun 2020: Sell 400 BP @ £5-00 - proceeds £2,000.
Allowable cost for the 400 is (400/1,600) x £5,760 = £1,440. Gain is £560.
(e) Carried-forward Section 104 holding is 1,200 BP at cost of £4,320.
(This is still average cost per share of £3-60).
(f) 18 Jul 2020: Buy 1,800 BP @ £4-40). Cost £7,920.
(g) Carried-forward Section 104 holding is 3,000 BP at cost of £12,240.
(Average cost per share is now £4-08).
(h) 9 Sep 2020: Sell 600 BP @ £4-88 - proceeds £2,928.
(i) 19 Sep 2020: Buy 1,200 BP @ £4-52. Cost £5,424.
The sale on 9 Sep 2020 (h) is matched to some of the shares bought on 19 Sep 2020 (i), because of the 30-day rule.
Allowable cost for the 600 sold is (600/1,200) x £5,424 = £2,712. Gain is £216 (£2,928 - £2,712).
(j) Carried-forward Section 104 holding is 3,600 BP at cost of £14,952 ((g) plus half of (i)).
(Average cost per share is now £4-1533).
All the best, and hope that helps.
Mike.