Continuous supply invoicing requires invoices timed to statements, payments, contract due dates, or completion events. For continuous supply of goods, invoices must be issued before or at the time each successive statement of account is issued or each payment is received. For continuous supply of services, invoicing depends on contractual payment terms: on or before the contractually ascertainable due date; if not ascertainable, before or at receipt of payment; or on or before completion of the linked event. If supply of services ceases before completion, an invoice must be issued at cessation for the supply made.