T-0.1 - Act respecting the Québec sales tax

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448. Where a particular person has charged to, or collected from, another person tax under section 16 calculated on the consideration or a part thereof for a supply and, for any reason, the consideration or part is subsequently reduced, the particular person may, in the reporting period of the particular person in which the consideration was so reduced or within four years after the end of that period,
(1)  where tax calculated on the consideration or part was charged but not collected, adjust the amount of tax charged by subtracting the portion of the tax that was calculated on the amount by which the consideration or part was so reduced; and
(2)  where the tax calculated on the consideration or part was collected, refund or credit to that other person the portion of the tax that was calculated on the amount by which the consideration or part was so reduced.
1991, c. 67, s. 448.