Core Viewpoint - The article provides a detailed guide on how to declare other business income using the Personal Income Tax App and the Natural Person Electronic Tax Bureau Web portal, emphasizing the steps and requirements for accurate tax reporting [1][2][3]. Group 1: Declaration Process - The declaration of other business income (A form) can be done through two methods: the Personal Income Tax App and the Natural Person Electronic Tax Bureau Web portal, with slight differences in operation but similar overall processes [1][2]. - Users must log in using their ID number and phone number or biometric recognition, then navigate to the appropriate section for business income declaration [2][3]. Group 2: Filling Information - After logging in, users select the tax year and fill in basic information, including the tax period and their habitual residence, which cannot be changed within the same tax year [3][4]. - Users must accurately report income sources, including entrusted collection income, invoice income, and any allowable deductions such as previous year losses and personal donations [4][5]. Group 3: Tax Calculation - The taxable income is calculated based on the formula: Taxable Amount = Taxable Income × Tax Rate - Quick Deduction [6]. - Users can also report any tax exemptions or benefits from tax treaties, and the system will automatically calculate the payable tax amount after considering pre-paid taxes [5][6]. Group 4: Submission and Confirmation - Once all information is filled out, users can submit their declaration and, if necessary, proceed to pay any taxes owed online [6]. - A confirmation of successful submission will be displayed, allowing users to check their declaration records afterward [6].