Ordinary VAT invoices are now divided into two situations: first, tickets issued by the billing system before the upgrade, then there will be online invoice numbers in the remarks column of the ticket face, and the authenticity can be checked according to the online invoice numbers. Second, the ticket issued by the upgraded billing system has no online invoice number, but there will be a check code. When querying invoices, choose the non-online invoice number to query; At present, due to the different inquiry systems in different places, in some places, such tickets can be found the next day, while in other places, they can only be found after the drawer copies the tax returns every other month.