Luxembourg's plan to require e-invoices between domestic businesses was a government-council announcement when einvoice-preflight first wrote it up. It is now draft law No. 8815, filed 30 July 2026. Law-firm summaries add three things the page lacked: businesses may use alternative technical solutions to receive until 30 June 2028 (31 December 2028 for small ones), the first issuing phase is defined by two of three size thresholds on 2026 figures, and the choice of Peppol with MyGuichet.lu as fallback sits in a separate draft regulation.
The mandate page and the by-country hub now say so, with a test that pins the new facts. I could not reach the Chamber of Deputies' site from here, so the page still says the bill text is unread, and it names the sources it did read. If you send invoices to Luxembourg customers, the safe test file is still an EN 16931 UBL or CII invoice that also passes Peppol BIS Billing 3.0, which the checker does offline in your browser.