Invoice No. 66-6 means ordinary invoice.

The coding principle of general VAT invoice codes is basically the same as that of special invoices. The meaning of the 10-digit code in the upper left corner of the invoice. The 1st to 4th digits represent each province, the 5th to 6th digits represent the year of plate production, and the 7th digit represents In the printing batch, the 8th digit represents the invoice type, the ordinary invoice is represented by 6, the 9th digit represents the several-part version, the two-part version of the ordinary invoice is represented by 2, the five-part version of the ordinary invoice is represented by 5, and the 10th digit represents the amount version. Number, 0 indicates the computer version.

In addition, what needs to be understood in particular is that the invoice code is the code given to the invoice by the tax department. When checking the authenticity of the invoice, you need to enter the invoice code. The invoice number is usually 10 or 12 digits.