Tax amount to be withheld this month = (accumulated tax withholding income this month * withholding tax rate-quick deduction)-accumulated tax reduction and exemption-accumulated tax withholding.

Cumulative prepaid taxable income this month = Cumulative income-Cumulative tax-free income-Cumulative expense deduction-Cumulative special additional deduction-Cumulative other deductions determined according to law.

In which: accumulated deduction =5000* months.