In this guide
Quick answer: we publish a free, open-source Dutch income tax calculator in Python — 2026 brackets, 30% ruling with the salary cap, general and employment tax credits, ZVW contribution and holiday allowance. No dependencies, Python 3.10+. Download it below, use and modify it freely; a link back to this site is appreciated.
Download
- dutch-tax-calculator.py — the calculator (single file, no dependencies)
- README.md — features, quick start and examples
What it calculates
The calculator covers the three 2026 Box 1 bands, the general and labour tax credits, and an optional 30% ruling estimate. It does not model every payroll item, pension deduction or personal circumstance, so treat the output as planning information rather than a tax assessment.
# Run the built-in demo (5 salary levels)
python dutch-tax-calculator.py
# Single salary
python dutch-tax-calculator.py 60000
Prefer a no-code version? The same logic powers our salary checker and the salary comparison tool.
License and attribution
Free to use, modify and distribute — commercially too. Attribution is appreciated: a link to expatnetherlandshub.com. Tax rates and thresholds are current as of March 2026; always verify against the Belastingdienst for decisions that matter.
No rights can be derived from this calculator or its output.