Legal basis: Article 9 of the Regulations for the Implementation of the Enterprise Income Tax Law of People's Republic of China (PRC), the calculation of taxable income of an enterprise is based on the accrual basis and belongs to the income and expenses of the current period, regardless of whether the payment is received or not. The income and expenses that do not belong to this period, even if the money has been received and paid in this period, are not regarded as the income and expenses of this period. Except as otherwise provided by this Ordinance and the competent departments of finance and taxation of the State Council.