Section 161 — Excise Tax Act: Early or late payments

For the purposes of this Part, where tangible personal property or services are supplied and the amount of consideration for the supply shown in the invoice in respect of the supply may be reduced if the amount thereof is paid within a time specified in the invoice or an additional amount is charged to the recipient by the supplier if the amount of the consideration is not paid within a reasonable period specified in the invoice, the consideration due shall be deemed to be the amount of consideration shown in the invoice.