[19(1)The amount of the balancing gain or loss on a relevant high value disposal to which paragraph 15 applies is found by adding—U.K.
(a)the amount of the balancing gain or loss belonging to the notional post-April 2016 gain or loss,
(b)the amount of the balancing gain or loss belonging to the notional pre-April 2016 gain or loss, and
(c)if P held the disposed of interest on 5 April 2015, the amount of the notional pre-April 2015 gain or loss,
(treating any amount which is a loss as a negative amount).
If the result is a positive amount, that amount is the balancing gain on the relevant high value disposal.
If the result is a negative amount, that amount (expressed as a positive number) is the balancing loss on the relevant high value disposal.
(2)The balancing gain or loss belonging to the notional post-April 2016 gain or loss is equal to the balancing fraction of the notional post-April 2016 gain or loss.
(3)The balancing gain or loss belonging to the notional pre-April 2016 gain or loss is equal to the balancing fraction of the notional pre-April 2016 gain or loss.
(4)“The balancing fraction” is—
where—
“BD” is the number of balancing days (see paragraph 16(2)) in the appropriate ownership period;
“TD” is the total number of days in the appropriate ownership period.
(5)The appropriate ownership period is—
(a)for the purpose of computing the balancing gain or loss belonging to the notional post-April 2016 gain or loss, the relevant ownership period mentioned in paragraph 15(4)(a);
(b)for the purpose of computing the balancing gain or loss belonging to the notional pre-April 2016 gain or loss, the relevant ownership period mentioned in paragraph 15(4)(b).
(6)In this paragraph—
(a)“notional post-April 2016 gain or loss” and “notional pre-April 2016 gain or loss” mean the same as in paragraph 15;
(b)“notional pre-April 2015 gain or loss” means the gain or loss which would have accrued on 5 April 2015 if the disposed of interest had been disposed of for a consideration equal to the market value of that interest on that date.]