104.6. For the purposes of sections 104.4 and 104.5, the following rules apply:(a) the computation of income earned in Québec and of income earned in Québec and elsewhere is made in the manner prescribed in the regulations made pursuant to section 22, with the necessary modifications; and
(b) the computation of business carried on in Canada, of business carried on in Québec and of business carried on in Québec and elsewhere by a corporation is made in the manner prescribed by the regulations made pursuant to subsection 2 of section 771, with the necessary modifications, and the computation of business carried on in Canada, of business carried on in Québec and of business carried on in Québec and elsewhere by a partnership is made in the manner so prescribed by those regulations, with the necessary modifications, as if the partnership were a corporation and its fiscal period were a taxation year.