Gross salary − social insurance & housing fund − IIT = what actually lands in your bank account.
For detailed bracket tables and examples, see the income tax calculator.
Typical personal rates: pension 8%, medical 2%, unemployment 0.5%, housing fund 5–12% (city-dependent). Total ≈ 15.5%–22.5% of gross salary. Employers pay a much larger share on top.
Possible reasons: your city's social insurance base is capped or floored (not your full salary), housing fund is lower, or annual bonus is taxed separately. This calculator uses your full salary as the base.