1. Confirm the accuracy of the information: Sign to confirm that the information provided by the customer is consistent with the bank records to avoid errors or inaccurate tax declarations.

2. Compliance requirements: Banks ensure that customers make corresponding confirmations when paying taxes and record them for filing or verification.

3. Prevent money laundering and fraud: Signatures can help banks better prevent illegal activities such as money laundering and fraud, and improve the security and compliance of the financial system.