Personal Income Tax Calculator

Enter monthly pre-tax salary, the cumulative month index (1 = Jan … 12 = Dec), monthly five-insurance & housing-fund deduction, monthly special additional deduction (children education, elderly care, housing loan, etc.) and the monthly threshold (default 5000). The calculator uses the 2024 seven-bracket progressive table and the cumulative withholding method: cumulative taxable income = Σ salary − threshold × months − Σ insurance − Σ special; cumulative tax = taxable × rate − quick deduction; this month's withholding = cumulative tax − already withheld. Assumes flat monthly figures; the prior-month withholding is derived from the same monthly inputs.