---
name: netherlands-references
description: Primary source references and related open-source projects for this jurisdiction.
license: AGPL-3.0-or-later (code) / OpenAccountants Guide License v1.0 (content)
metadata:
  source: openaccountants
  jurisdiction: NL
  category: tax
  quality: source-cited draft
  openaccountants_url: "https://openaccountants.com/skills/netherlands-references"
  obligation: OTHER
---

# Netherlands — Related Open-Source Projects

> **General reference only.** This skill is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for any specific person's facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.

OpenAccountants is AGPL-3.0. All projects below have compatible licenses.

## dutch-tax-income-calculator

- Repository: [stevermeister/dutch-tax-income-calculator-npm](https://github.com/stevermeister/dutch-tax-income-calculator-npm)
- License: MIT
- Language: English / Dutch
- Stars: 33
- Scope: npm package for Dutch income tax calculation. Computes payroll tax, social tax, general credit (algemene heffingskorting), labour credit (arbeidskorting), and net income from gross salary.
- Integration: MIT. Tax computation logic, credit calculations, and rate tables directly usable.

## ib-broncode (Inkomstenbelasting)

- Repository: [Hilbrand/ib-broncode](https://github.com/Hilbrand/ib-broncode)
- License: AGPL-3.0
- Language: Dutch
- Scope: Source code for a web tool providing insight into Dutch income tax categories, brackets, IACK (inkomensafhankelijke combinatiekorting), and Wet Inkomstenbelasting 2001 rules.
- Integration: Same license (AGPL-3.0). Tax category logic and bracket data directly usable.

## MinBZK/poc-machine-law (RegelRecht)

- Repository: [MinBZK/poc-machine-law](https://github.com/MinBZK/poc-machine-law)
- License: check (government project)
- Language: Dutch
- Scope: Dutch government proof-of-concept for machine-readable legislation, including Wet Inkomstenbelasting (Income Tax Act) for toetsingsinkomen (test income) calculation.
- Integration: Reference for how the Dutch government itself models tax law as executable rules. Useful for validation and rule structure.

## belastingbonnetje

- Repository: [Giels14/belastingbonnetje](https://github.com/Giels14/belastingbonnetje)
- License: MIT
- Language: Dutch
- Stars: 4
- Scope: Calculates how Dutch tax payments are distributed across government spending categories, based on the Rijksbegroting 2025.
- Integration: MIT. Not directly tax computation, but useful for user-facing explanations of where tax money goes.

---

_Source: [OpenAccountants](https://openaccountants.com/skills/netherlands-references) — open tax Guides for AI, reviewed by named CPAs/CAs/EAs. Quality: **source-cited draft**. For always-current figures and named-accountant backing, connect the OpenAccountants MCP server (`openaccountants-mcp`)._