T-0.1, r. 2 - Regulation respecting the Québec sales tax

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350.51.1R5. The person making a supply for a group of persons pursuant to a written agreement relating to the supply may, as soon as possible after the group event, provide an invoice insofar as it is provided to the recipient with another document requesting payment; the person is to retain a copy of the invoice and other document with the written agreement.
O.C. 586-2015, s. 7.