Section 4 — Income Tax Act: Income or loss from a source or from sources in a place

For the purposes of this Act, a taxpayer’s income or loss for a taxation year from an office, employment, business, property or other source, or from sources in a particular place, is the taxpayer’s income or loss, as the case may be, computed in accordance with this Act on the assumption that the taxpayer had during the taxation year no income or loss except from that source or no income or loss except from those sources, as the case may be, and was allowed no deductions in computing the taxpayer’s income for the taxation year except such deductions as may reasonably be regarded as wholly applicable to that source or to those sources, as the case may be, and except such part of any other deductions as may reasonably be regarded as applicable thereto; and where the business carried on by a taxpayer or the duties of the office or employment performed by a taxpayer was carried on or were performed, as the case may be, partly in one place and partly in another place, the taxpayer’s income or loss for the taxation year from the business carried on, or the duties performed, by the taxpayer in a particular place is the taxpayer’s income or loss, as the case may be, computed in accordance with this Act on the assumption that the taxpayer had during the taxation year no income or loss except from the part of the business that was carried on in that particular place or no income or loss except from the part of those duties that were performed in that particular place, as the case may be, and was allowed no deductions in computing the taxpayer’s income for the taxation year except such deductions as may reasonably be regarded as wholly applicable to that part of the business or to those duties, as the case may be, and except such part of any other deductions as may reasonably be regarded as applicable thereto. Subject to subsection 4(3), in applying subsection 4(1) for the purposes of this Part, no deductions permitted by sections 60 to 64 apply either wholly or in part to a particular source or to sources in a particular place. In applying subsection 4(1) for the purposes of subsections 104(22) and 104(22.1) and sections 115 and 126, subject to paragraph (b), all deductions permitted in computing a taxpayer’s income for a taxation year for the purposes of this Part, except any deduction permitted by any of paragraphs 60(b) to (o), (p), (r) and (v) to (z), apply either wholly or in part to a particular source or to sources in a particular place; and any deduction permitted by subsection 104(6) or 104(12) shall not apply either wholly or in part to a source in a country other than Canada. [Repealed, 1996, c. 21, s. 2(1)]