Versions of s. 171(2)(a)
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there may be included the total of any tax that became payable by the person before that time, to the extent that the tax was payable in respect of services to be supplied to the person after that time for consumption, use or supply in the course of commercial activities of the person or was calculated on the value of consideration that is a rent, royalty or similar payment attributable to a period after that time in respect of property that is used in the course of commercial activities of the person; and