References

Background material for the calculator surface. The glossary defines every payroll-tax term used on calculator pages; the methodology page explains how each country's engine is implemented and verified; tax-year overviews summarise each country's published rate schedule for the active tax year.

• Tax glossary

  Plain-language definitions of the payroll-tax terms used throughout this site (PAYE, FICA, IRPF, Sozialversicherung and more).

• Methodology

  How each country's tax engine is implemented, the reference calculator each is pinned to, and the per-country fixture tolerance.