Full text
For the purposes of this section, where in any taxation year the income of a taxpayer who has an eligible child for the year and the income of a supporting person of the child are equal (on the assumption that both incomes are computed without reference to this section and paragraphs 60(v.1) and 60(w), no deduction shall be allowed under this section to the taxpayer and the supporting person in respect of the child unless they jointly elect to treat the income of one of them as exceeding the income of the other for the year.