Income Tax Act ( R.S.C. , 1985, c. 1 (5th Supp.))

except to the extent that the income is exempt from income tax in Canada by reason of a provision contained in a tax convention or agreement with another country that has the force of law in Canada, or

except any part thereof included in the total determined under this definition by reason of paragraph (c) or exempt from income tax in Canada by reason of a provision contained in a tax convention or agreement with another country that has the force of law in Canada,

exceeds the total of all amounts each of which is