According to the general tax regulations, the invoice increment in the electronic tax bureau refers to the new invoice data generated in the electronic invoice system, which needs to be confirmed by the buyer. The purpose of the buyer's confirmation of invoices is to ensure that the buyer examines and recognizes the authenticity and validity of these new invoices, and to prevent false invoices and fraud, which can ensure that the contents of invoices are consistent with the actual transactions, and also provide the buyer with an opportunity to verify and record tax information.

The process of buyer's invoice confirmation varies with the electronic tax bureau system. Usually, the buyer needs to log in to the electronic tax bureau system to check the new invoice data and confirm it. The way to confirm the invoice may include clicking the confirm button, entering the verification code or digital signature, etc. The buyer confirms that the invoice may have legal effect and be used as evidence in tax audit or other related procedures.