Mayi Social Security Beijing Calculator

Problem

When you have a Beijing social security contribution base, the task is usually not just to calculate a total payroll amount. You also need to split employee and employer contributions across pension, medical and maternity, unemployment, and work injury insurance. Manual calculations are error-prone, especially because work injury rates vary by industry and the medical line includes a 3 CNY major disease surcharge.

How It Works

The skill takes a --base value, defaults to the July 2025 to June 2026 Beijing rate window, and runs scripts/generate.py to compute and render the result. Key steps include:
- parsing the contribution base and asking for it if missing;
- clamping the base to 7,162 – 35,811 CNY/month, with a note on the chart when a bound is applied;
- calculating pension at 16% employer / 8% employee, medical and maternity at 9.8% employer / 2% employee plus 3 CNY, and unemployment at 0.5% each;
- applying --injury-rate for work injury, default 0.4% and ranging from 0.2% to 1.9%, with no employee contribution;
- printing a terminal summary of employee, employer, monthly, and annual totals, then generating a PNG infographic with the base, itemized columns, total composition bar, and footnotes.

Boundaries

The output is a quick-reference estimate, not an official payroll statement. The actual work injury rate depends on the employer’s registered industry risk class, and contribution base limits are adjusted every July. Final amounts should be confirmed by the social security administration.