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OkInvoice

All guides

Plain-language guides to the e-invoicing rules, checked against official sources.

Tools

E-invoice validatorCheck XRechnung, ZUGFeRD, Factur-X and Peppol files against the official rules, in your browser.Deadline checkerAnswer four questions and see when you must receive and issue e-invoices.Mandates by countryEvery e-invoicing deadline in Germany, France and Belgium on one page.

Countries and who is affected

GermanyE-Rechnung: receive since 2025, issue from 2027 or 2028.FranceReceive since September 2026, issue from 2026 or 2027 via an approved platform.Belgium (Peppol)Structured e-invoices over Peppol for B2B since January 2026.France’s e-invoicing directoryThe State annuaire that routes French e-invoices.Approved platforms (PA)France’s plateformes agréées: what they do and how to choose.Auto-entrepreneursWhat France’s mandate means for micro-entrepreneurs.KleinunternehmerGermany’s small-business scheme and e-invoices.

Formats and networks

XRechnungGermany’s EN 16931 format for public and business invoices.ZUGFeRDA PDF with the invoice data inside: profiles and what counts.Factur-XThe Franco-German hybrid PDF invoice and its profiles.PeppolThe network and the BIS Billing 3.0 format behind Belgium’s mandate.Peppol directoryFind a company’s Peppol ID and check it can receive.Leitweg-IDThe routing ID for invoices to German public bodies.What is e-invoicing?Plain-language glossary from BT codes to ViDA.

Software and free options

Software for GermanyInvoicing tools that send XRechnung and ZUGFeRD, compared.Software for FranceApproved platforms and invoicing tools for the French reform.Peppol access pointsPeppol software and access points for Belgian businesses.Free optionsFree ways to send, receive and read e-invoices.

About OkInvoice

AboutWho makes OkInvoice and how it is funded.MethodologyHow we check facts and how the validator works.