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    nex-invoice-bot-pattern

    by Nex AI

    A Belgian-compliant, JSON-backed invoicing system with VAT-regime toggles and sequential numbering logic.

    Updated Jun 2026
    Security scanned

    $9

    · or 45 credits

    30-day refund guarantee

    Secure checkout via Stripe

    Included in download

    • Toggle between 21% VAT and the "Kleine Onderneming" 0% exemption regime.
    • Generate professional invoice PDFs with automated subtotals and legal footers.
    • terminal automation included
    • Instant install

    Sample input

    I'm starting a freelance business in Belgium under the kleine onderneming regime. Set up a system to manage my clients and generate compliant 0% VAT invoices.

    Sample output

    I've generated your invoicing system:

    • config.py: Set to Kleine Onderneming (0% VAT).
    • numbering.py: Implements YYMMDDXXX sequential logic.
    • pdf_generator.py: Includes mandatory Belgian exemption footer.
    • data_store.py: JSON-based CRUD for your records. Ready to create your first invoice?

    About This Skill

    What it does

    The Nex Invoice Bot Pattern is a specialized tool for Belgian freelancers and agencies to automate their billing without the overhead of a traditional database. It generates a complete, JSON-backed invoicing system that handles client management, project tracking, and compliant PDF generation.

    Supported tools

    • Data Management: Flat-JSON storage for clients, projects, and invoices.
    • Compliance: Belgian-specific VAT logic and sequential invoice numbering.
    • PDF Generation: ReportLab integration for professional, ready-to-send invoices.
    • Front-end: Optional integration with Telegram for invoice creation on-the-go.

    Why use this skill

    Prompting an AI to "write an invoice" often results in illegal numbering or missing legal mentions. This skill enforces strict Belgian compliance rules: a global, gap-free numbering sequence (YYMMDD + 3-digit counter) and a toggle for "Kleine Onderneming" (0% VAT exemption) including the mandatory legal footer or standard 21% VAT calculations.

    What the output looks like

    You receive a modular Python codebase including a data store CRUD layer, a dedicated numbering engine, and a PDF generator. It ships with sample JSON schemas so you can start billing immediately by just filling in your IBAN and VAT number in the config file.

    Use Cases

    • Automate Belgian compliant invoice numbering (YYMMDD-XXX) without gaps.
    • Toggle between 21% VAT and the "Kleine Onderneming" 0% exemption regime.
    • Generate professional invoice PDFs with automated subtotals and legal footers.
    • Manage clients and projects using a lightweight JSON store instead of a DB.
    • Enable invoice creation via Telegram for billing while on-site with clients.

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    Security Scanned

    Passed automated security review

    Permissions

    Terminal / Shell

    Allowed Hosts

    nex-ai.be

    File Scopes

    nex-invoice-bot-pattern/**

    Tags

    fintech
    belgium-taxes
    automation
    python
    pdf-generation

    Creator

    Nex AI

    Founder of Nex AI. I build production-grade Claude Skills from systems that actually run: multi-tenant SaaS, Telegram agents, Raspberry Pi infrastructure, 3D multiplayer rooms. Every skill ships battle-tested patterns, not theory. 33+ open source skills published, commercial catalog growing.

    Frequently Asked Questions

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