173.3. For the purposes of this Act, where a trust that is resident in Canada designates, for the purposes of the Income Tax Act (R.S.C. 1985, c. 1, (5th Suppl.)), an amount for a taxation year in accordance with subsection 5.4 of section 18 of that Act in respect of all or any portion of an amount paid or credited as interest by the trust, or by a partnership, in the year to a person not resident in Canada, the amount so designated is deemed to be income of the trust that has been paid to the person not resident in Canada as a beneficiary of the trust, and not to have been paid or credited by the trust or the partnership as interest, to the extent that an amount in respect of the interest(a) is included in computing the income of the trust for the year under paragraph m.1 of section 87; or
(b) is not deductible in computing the income of the trust for the year because of section 169.
Chapter V.2 of Title II of Book I applies in relation to a designation made under subsection 5.4 of section 18 of the Income Tax Act.