It depends on whether your local IRS (not local tax bureau) is certified by hand or by machine. Generally, you need to carry the qualification certificate of VAT general taxpayer (there is an electronic tag behind the certificate, and you need to enter the password when authenticating the machine), the qualification certificate of VAT special invoice management personnel, and the invoice deduction form that needs to be certified.

As for how to authenticate, the most direct way is to go to the IRS to see how others operate. Just look at it once. When to enter the password and how to place the invoice, it is very simple to follow the prompts.

At present, the invoice certification period is 180 days, which does not mean that you have to be certified in the month when you receive the invoice, but also depends on how many invoices you can issue in the month, which involves the question of how much tax to pay and when to pay it, but it must be certified within 180 days at the latest.

Generally, the certification time is from the beginning of the month to the penultimate working day of the end of the month, and the certification is usually only one morning on the last working day. To be on the safe side, the certification is made two days in advance. After the machine is certified, it will print you a receipt with the certified quantity and amount. Generally, there is no manual bill, and the input tax is declared according to the actual certified amount when it is certified for tax return.