156.2. The amount referred to in paragraph a of section 156.1 is, in respect of an individual for a taxation year, equal to 20% of the amount determined in respect of the individual for the year according to the following formula:
A × (B / C).
For the purposes of the formula provided in the first paragraph,(a) the letter A represents the amount deducted by the individual, in computing his income for the year, under paragraph a of section 130 or the second paragraph of section 130.1 in respect of a prescribed depreciable property;
(b) the letter B represents the amount by which the aggregate of the income earned in Québec and elsewhere by the individual for the year exceeds the income earned in Québec by the individual for the year;
(c) the letter C represents the aggregate of the income earned in Québec and elsewhere by the individual for the year.