Invoice authentication refers to the special VAT invoices purchased by enterprises for goods and raw materials produced or sold, and authentication is required when deducting input tax. The certification period is within 90 days after the invoice is issued. Generally, it is necessary to carry a copy of the deduction invoice and tax registration certificate of the certified invoice for invoice authentication.

After you get the VAT invoice, you should send the first deduction and the invoice to the IRS under your jurisdiction to verify the authenticity of the invoice. If it is certified, the tax can be deducted, that is, the national tax payable this month = the output tax MINUS the input tax this month, and the VAT invoice must be certified within 90 days, otherwise it will not be deducted.