How we calculate

Each calculator follows the law and official values currently in force: the IRS Code, withholding tables, the Labour Code, Segurança Social, IMT and IUC tables, ERSE tariffs and INE data. On every page, "How it was calculated" lists the assumptions and links to the sources.

Every result has a confidence level: Exact calculation (fixed formula with official values), Estimate (depends on assumptions) or Guidance (information to confirm with the relevant authority).

Yearly values (minimum wage, IAS, IRS brackets, deductions) are kept in one block of parameters and reviewed every January and whenever new legislation is published.

Before every update we run an automated test battery with official cases, edge cases and a comparison across the 7 languages.

Results are estimates to help you decide. They do not replace an accountant, a lawyer or the relevant authority.