A client-side tool to calculate your net disposable income ("netto overhead") after Dutch income tax and childcare costs.
Live Demo: https://bad33ndj3.github.io/netto-calculator/
- 2026 Tax Rules: Includes the latest Box 1 brackets, Heffingskortingen (General & Labour), and phase-outs.
- 2026 Childcare Benefit (KOT): Uses the new max rate (€11.23) and reimbursement table (96% up to €56k).
- Real-time Simulation: Adjust working days and see the financial impact instantly.
- Privacy: All data is processed locally in your browser and saved to LocalStorage.
Simply open the site, enter your gross monthly salary (full-time basis), and adjust the sliders to match your situation. The tool handles the pro-rating and tax calculations automatically.