Legal basis: Article 9 of the Individual Income Tax Law of People's Republic of China (PRC) takes the income as the taxpayer and the unit or individual that pays the income as the withholding agent. If the taxpayer has a China citizenship number, the China citizenship number shall be the taxpayer identification number; If a taxpayer does not have a China citizenship number, the tax authorities shall issue a taxpayer identification number. When a withholding agent withholds tax, the taxpayer shall provide the withholding agent with the taxpayer identification number.