Amalgamation liability: intercompany supplies during retroactive merger period are included in each company's turnover and taxed accordingly. When companies are amalgamated or merged with retrospective effect, supplies or receipts between such companies during the period from the effective date until the date of the order are to be included in each company's turnover and taxed; the companies are treated as distinct for the period up to the order and their registration certificates are cancelled with effect from the date of the order.