Core Viewpoint - The article provides a detailed guide on the procedures and requirements for tax-related professional service agencies to log in and manage their agency business through the electronic tax bureau, emphasizing the importance of compliance with regulations and the necessary prerequisites for operation [2][3][4]. Group 1: Agency Business Login - The agency business login allows tax service personnel to set up agent accounts to handle tax matters on behalf of clients, requiring prior submission of basic information and completion of real-name authentication [2]. - Only tax service agencies with a credit rating of TSC5 or above can utilize the bulk declaration feature [2]. Group 2: Operation Steps - The login process involves selecting the "Agency Business" option on the electronic tax bureau, entering the agency identification number, service personnel's ID number or phone number, and personal user password [3]. - After successful login, personnel can select the client company to manage tax-related tasks [3]. Group 3: Bulk Declaration - After logging in, tax service personnel can access the bulk declaration interface, which displays a list of current declarations for the client companies, allowing for various operations such as filling out forms, viewing, canceling, and making payments [4]. - The article references the National Taxation Administration's regulations that outline the responsibilities and rights of both the taxpayer and the tax service agency when handling tax matters [4].