Data Sources and Update Policy

1. Source priority

For Korean tax, payroll, labor and social-insurance calculators, we first use laws, government notices and official guidance from the National Tax Service, Ministry of Employment and Labor, National Health Insurance Service, National Pension Service and other responsible public institutions. Each calculator links to the material used whenever a stable public URL is available.

2. Calculation and testing

Each focused calculator defines its formula, default assumptions, input limits and result breakdown separately. When calculation code changes, representative inputs and boundary cases are tested again before publication.

3. Representative verification records

The following reference cases are rerun automatically when calculation code changes. They verify that the explanations and calculator output remain aligned; they are not official assessments for an individual user.

See the full assumptions and calculation steps in the focused calculation guides.

4. Review cycle

Rule-based calculators are reviewed at least once each calendar year and again when a responsible authority announces a material rate or formula change. The date on a page means the rules and source links were checked; it does not mean every individual exception is included.

5. Rounding and exclusions

Displayed amounts may be rounded to the nearest won or percentage. Official bills can use daily calculations, institution-specific rounding, caps, deductions, exemptions and supporting documents that a short calculator cannot determine. Important exclusions are listed on each calculator.

6. Error reports and corrections

Compare the result with the relevant contract, payslip, notice or official simulator. If a formula, rate or source appears wrong, report the calculator name, input conditions and supporting official material through Contact. The operator reproduces the issue, checks the responsible authority’s material, updates the formula or explanation and records the review date.