belastingadviseur

Belastingadviseur Plugin

A bilingual Dutch tax workflow plugin for Cowork and Claude Code. It supports full-spectrum Netherlands tax operations for particulier, ZZP, and BV use cases.

Important: This plugin supports tax workflows, not legal or fiscal advice. All outputs must be reviewed by a qualified Dutch tax professional before filing, payment, objection, or legal submission.

Installation

1. Download the latest .zip from GitHub Releases.
2. Open Claude and navigate to Cowork > Plugins.
3. Click the "..." menu and select "Upload plugin".
4. Select the downloaded zip file.

Commands

Command	Description
/belastingadviseur:intake	Intake and dossier setup for taxpayer profile, obligations, and missing documents
/belastingadviseur:tax-calendar	Build a verified tax deadline calendar for the selected year/profile
/belastingadviseur:ib-aangifte	Prepare inkomstenbelasting workflow (box 1/2/3 context, checks, and filing readiness)
/belastingadviseur:btw-aangifte	Prepare and check BTW return workflow for monthly/quarterly/annual obligations
/belastingadviseur:vpb-aangifte	Prepare vennootschapsbelasting workflow and pre-filing control checklist
/belastingadviseur:loonheffingen	Prepare payroll tax workflow (loonheffing, wage tax, social contributions, WKR checks)
/belastingadviseur:aftrekcheck	Validate relevant deductions, credits, and scheme eligibility with evidence checklist
/belastingadviseur:bezwaar-brief	Draft a Dutch bezwaar letter template with legal references and deadline controls

Skills

Skill	Description
belasting-intake-en-dossiervorming	Intake framework, document requests, taxpayer segmentation, and dossier quality controls
inkomstenbelasting-boxen	Box-based IB workflow (box 1/2/3), evidence mapping, and risk checks
omzetbelasting-btw	VAT period handling, output/input VAT checks, ICP logic, and correction flows
vennootschapsbelasting-vpb	Corporate tax workflow, fiscal profit bridge, and supporting schedules
loonheffingen-en-werkkosten	Payroll tax filing workflow including WKR, payroll evidence, and periodic controls
aftrekposten-en-regelingen	Deduction and allowance qualification workflow for individuals and businesses
bezwaar-en-correspondentie	Objection structure, argument mapping, and correspondence quality standards
officiele-bronverificatie	Mandatory verification protocol for rates, dates, thresholds, and legal references

Official Source Policy

This plugin enforces an official-source-first policy before any date/rate/threshold/legal claim:

1. Verify against belastingdienst.nl and/or wetten.overheid.nl.
2. Cite exact URL and retrieval date (YYYY-MM-DD) in output.
3. If verification is unavailable, explicitly mark the item as not verified and do not present it as final.

Connectors

If placeholders like ~~boekhouding or ~~data warehouse appear, see CONNECTORS.md.

Example Prompts

Each command below can be tested with the included test data files.

Intake — ZZP client onboarding

/belastingadviseur:intake zzp 2025

Upload klanten.csv. Builds a complete dossier for Jan de Vries (ZZP) with obligations, missing documents, and risk flags.

Tax Calendar — BV annual planning

/belastingadviseur:tax-calendar 2025 bv

Upload klanten.csv. Generates a verified deadline calendar for Bakkerij Broodjes BV covering BTW, VPB, and loonheffingen filing dates.

IB Aangifte — Individual income tax

/belastingadviseur:ib-aangifte 2025 particulier

Upload particulier_maria_inkomsten_2025.csv and particulier_maria_box3_2025.csv. Walks through box 1 (salary, eigen woning, partner), box 3 (vermogen incl. crypto), and checks completeness.

BTW Aangifte — Quarterly VAT return

/belastingadviseur:btw-aangifte 2025-Q2 zzp

Upload zzp_pieter_btw_q2_2025.csv. Processes Q2 VAT including ICP transactions (DE, BE, CH), reverse-charge, and open invoices.

VPB Aangifte — Corporate income tax

/belastingadviseur:vpb-aangifte 2025

Upload bv_broodjes_resultatenrekening_2025.csv. Builds the fiscal profit bridge from commercial result to taxable profit with supporting schedules.

Loonheffingen — Monthly payroll tax