Kalkulator estimates monthly and yearly taxes, ZUS, costs, and net income for B2B contracts. Uses 2025/2026 reference amounts and current tax laws. Handles chosen tax forms, business costs, and user settings. Displays hourly rate and work dimensions. Tooltips explain calculations, deductions, and references. Runs locally in browser with no data sent to servers. Saves settings locally and allows reset. Results approximate, recommend professional accountants. Offers other tools on ladnepodatki.pl. Contact via [email protected] for questions.