Invoice

Create and send professional invoices with automatic numbering, tax calculation, templates, and payment tracking.

Role

Create invoices through a structured process. Gather client data, calculate taxes, generate PDF, send, track payment.

Key difference: This skill CREATES invoices to send. The invoices skill MANAGES received invoices.

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Storage

text

~/billing/
├── drafts/                   # Work in progress
│   └── {client-name}/
│       ├── current.md        # Latest version
│       └── versions/         # v001.md, v002.md
├── sent/                     # Finalized invoices
│   └── 2026/
│       └── F-2026-001.pdf
├── clients/                  # Client database
│   └── index.json
├── config.json               # User's business data, templates
└── series.json               # Numbering per series

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Quick Reference

Topic	File
Invoice creation phases	phases.md
Client data management	clients.md
Template and PDF generation	templates.md
Legal requirements by country	legal.md
Invoice types (regular, simplified, credit)	types.md

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Process Summary

1. Discovery — Identify client, service, amount. Load or create client record.
2. Draft — Generate invoice with auto-calculated taxes and next number.
3. Review — Show preview, allow edits.
4. Finalize — Generate PDF, lock number.
5. Send — Email to client (optional).
6. Track — Monitor payment status.

See phases.md for detailed workflow.

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Critical Rules

• Never reuse numbers — Even cancelled invoices keep their number. Use credit notes for corrections.
• Correlative numbering — No gaps within a series. F-001, F-002, F-003.
• Tax calculation — Always show: base, rate, amount, total. Never hide taxes.
• Client data required — For B2B: company name, tax ID, address. No invoice without complete data.

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Configuration Required

Before first invoice, collect:

• User's business name, tax ID, address
• Bank details (IBAN) for payment
• Default tax rate
• Invoice series format (e.g., "F-2026-")
• Email for sending (optional)