Methodology & sources

Our approach

FinAdministrator calculations run entirely in your browser against static, versioned tax-rules data files — there are no external API calls and nothing you enter is transmitted or stored. Each file is sourced from official government publications, carries the source URLs and the date we retrieved them, and is archived by year so prior years remain available.

For each salary we apply the relevant country's income tax (progressively, band by band), its mandatory social or payroll contributions, and any region-specific rules you select. We show the full gross-to-net breakdown so you can see exactly where each part of your salary goes.

What these figures are — and aren't

They are estimates for general information, accurate for a typical salaried employee in a standard situation. They are not a payslip, a tax return, or professional advice. They cannot capture every personal allowance, benefit-in-kind, local levy, salary-structure choice or individual circumstance. Always confirm with the relevant tax authority or a licensed adviser before making financial decisions.

Praveen, who operates FinAdministrator from Berlin, Germany, is not a licensed tax professional. Where we make a deliberate simplification — for example, the German taxable-income approximation, or simplified US state-tax modelling — we note it in the calculator's warnings and in our data files.

Annual updates

Tax law changes by statute every year. We publish a new data file for each tax year and keep the old one, so a search for a prior year's brackets still finds an accurate, dated page. We re-verify every figure against its official source before a new year's calculators go live.

Sources by country