Versions of s. 171(4)(a)
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in determining the input tax credits of the person for the last reporting period of the person beginning before that time, there may be included the total of any tax that becomes payable by the person after that time, to the extent that the tax is payable in respect of services that were supplied to the person before that time for consumption, use or supply in the course of commercial activities of the person or is calculated on the value of consideration that is a rent, royalty or similar payment attributable to a period before that time in respect of property that is used in the course of commercial activities of the person; and