772.8. An individual who is resident in Québec on the last day of a taxation year and who, in the year, carries on a business in a foreign country through an establishment situated in that country, may deduct from his tax otherwise payable under this Part for the year an amount that does not exceed the total of(a) 45% of the business-income tax paid by the individual for the year in respect of businesses the individual carried on in that country; and
(b) the individual’s unused portions of the foreign tax credit in respect of that country for the ten taxation years preceding the year and the three taxation years following the year.