If you supply goods or services on credit, it is important that you print out invoices as soon as possible after you have delivered them. Experience has shown that poor invoicing routines can result in some businesses forgetting to invoice deliveries. In other cases, we have seen poorly completed invoices to the extent that it leads the tax authorities to increase the income on a discretionary basis.
Print out sales documents (invoices) as soon as possible after the goods/service has been delivered. The general rule is that sales documents must be issued no later than one month after delivery. The best arrangement is to print out sales documents on the same day as delivery takes place.