Here's the thing. General VAT taxpayers can purchase invoices through the invoicing system of the Golden Tax Project of the Inland Revenue Department. After the end of the month, he has to copy the tax to the tax bureau for tax return within 10 days, and can only buy the invoice after the tax return last month. In this case, as long as you made a tax copy at the beginning of the month, you don't need to do anything in the billing system now, but don't forget to read the invoice information into the billing system after purchasing the invoice.