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

E-invoice XML checked against EN 16931 and the 2026 national mandates.

Who it’s for
Developers and integrators who build the billing code that emits EU e-invoices.

What breaks, and when
France requires every company to be able to receive e-invoices from 1 September 2026 and Poland’s KSeF became mandatory in 2026; an invoice XML missing a mandatory mention is rejected by the platform.

What you get
• 5 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/e-invoicing

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