How does it ensure calculation accuracy?

It enforces rounding to the nearest cent and requires tests using real-world numbers that must be manually verifiable against official fiscal rules.

Can it modify an invoice that has already been issued?

No, following Italian law, this skill enforces that invoices in an 'Issued' state cannot be modified; an annulment requires a separate credit note.

Does this skill handle Italian Public Administration invoices?

Yes, it includes specific logic for PA requirements such as Codice Univoco Ufficio, CIG, and CUP as per Italian electronic billing standards.

Can I use it for simple UI refactoring?

No, this skill is specifically optimized for features with fiscal impact. It should not be used for technical bug fixes or UI changes that do not affect tax logic.

Which Italian laws are supported by this skill?

It primarily validates against DPR 633/72 (VAT), DPR 600/73 (Income Tax), and DPR 642/72 (Stamp Duty).

Italian Invoicing Feature Implementation

Name: Italian Invoicing Feature Implementation
Author: lazyoft

bylazyoft

•

E-commerce Solutions

Implements legally compliant features for Italian electronic invoicing systems by validating against specific fiscal regulations and statutes.

This skill empowers Claude to build and extend Italian invoicing software while ensuring strict adherence to national fiscal laws such as DPR 633/72 and DPR 600/73. It automates the complex logic required for VAT calculations, withholding taxes, split payments, and Public Administration (PA) compliance. By analyzing local domain rules and enforcing immutable state transitions for issued invoices, it minimizes the risk of non-compliance and financial errors in Italian financial applications.

Key Features

01Compliance-driven logic for VAT, withholding tax, and split payments

02Strict data integrity rules for issued invoices and progressive numbering

03Automated fiscal validation against Italian DPR 633/72 and 600/73 statutes

04Automated test generation with real-world financial verification scenarios

05Electronic invoicing support for Public Administration (PA) and B2B/B2C

062 GitHub stars

Use Cases

01Implementing Public Administration specific fields like Codice Univoco, CIG, and CUP

02Adding support for Regime Forfettario (flat-rate tax) to an existing billing platform

03Creating credit note logic that maintains fiscal traceability and compliance

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add lazyoft/raymond-invoices implement-feature

For use in Claude.ai and ChatGPT

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