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Group 1 - The article discusses the tax implications for individuals receiving annual bonuses, emphasizing that they can choose to either calculate the tax separately for the bonus or include it in their comprehensive income [7][11][12] - It is stated that once a taxpayer chooses a method for calculating the annual bonus tax within a tax year, they cannot switch methods for that same bonus [7][10] - The calculation method for the annual bonus tax is detailed, indicating that the bonus amount should be divided by 12 to determine the applicable tax rate and deduction [11][15] Group 2 - The article references specific tax regulations, including the notice from the State Administration of Taxation regarding the adjustment of personal income tax calculation methods for annual bonuses [15] - It highlights that various types of bonuses, such as quarterly or half-year bonuses, must be combined with monthly salary for tax purposes and cannot be treated as annual bonuses [10][12] - The article suggests using the mobile tax app to compare the tax outcomes of different calculation methods to determine the most beneficial option for the taxpayer [13]