Финансы в Канаде
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оттуда же:
If, for example, a resident of Canada receives income from sources in another country which has been subject to withholding tax at a rate in excess of the rate specified in a treaty between Canada and that country, such excess is not considered to be foreign tax paid for the year for purposes of the foreign tax credit. The maximum credit allowed will be determined on the basis of the treaty rate and the taxpayer should seek a refund of the excess withholding tax from the foreign revenue authorities.