E-Invoice Mandate Lint: Lints UBL and CII invoice XML against EN 16931 and the national e-invoicing mandates that are live in 2026

EU rules dated 2026 — AI Act, e-invoicing, accessibility — checked in VS Code.

Who it’s for
Developers and compliance leads shipping software into the EU in 2026.

What breaks, and when
EU dates in this shelf are already live: AI Act documentation duties for general-purpose models since 2 August 2025, national e-invoicing mandates in 2026 that reject invoices missing EN 16931 fields.

What you get
• 27 ReadyStack linters on this shelf (VS Code Marketplace and Open VSX), plus any added later
• Your key unlocks the whole-workspace sweep and the dated report in each
• Rule updates pulled from ReadyStack without a reinstall
• The single-file check stays free without a key

FAQ
Q: How is this different from asking ChatGPT?
A: Each check reads your own file against a rule file that names the provision and its start date; the report records the run date, check version and file fingerprints. A chat answer has none of that and may describe last year’s rule.

Billed $79 a year. All linters on the shelf: https://getreadystack.com/collections/eu-rules-2026

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