Core Viewpoint - The article emphasizes the importance of timely reporting of specific tax-related professional services by various institutions, including tax firms and accounting firms, to the tax authorities by March 31, 2026, to avoid negative impacts on credit scores [3][11]. Group 1: Reporting Requirements - Institutions providing tax-related professional services must submit annual reports detailing the overall situation of tax services for the previous year, ensuring data accuracy and allowing for corrections if necessary [3][4]. - Specific business element information must be reported by tax firms and accounting firms that completed certain services, including tax advisory and compliance plans, by the same deadline [4][5]. Group 2: Submission Process - The submission process involves logging into the electronic tax bureau, navigating to the relevant sections for tax service management, and ensuring that the report is accurate before submission [5][6]. - Institutions can view or correct previously submitted reports through the electronic tax bureau interface, ensuring that all data is up-to-date and accurate [8][9]. Group 3: Important Dates and Data - The deadline for submitting both the annual report and specific business element information is set for March 31, 2026 [4][5]. - Institutions are advised to ensure that the total reported business income does not exceed the total VAT declared income for the same year, with exceptions requiring supporting documentation [14].