Mandatory E-Invoicing in Europe: What Is Actually Obligatory
E-invoicing in Europe explained: the EU requirements and regulations, when e-invoicing becomes mandatory, and which national law actually obliges your business.
This section answers one question over and over, in a different jurisdiction each time: who is obliged to issue a structured invoice, to whom, from which date, and under which law. It is written for the person inside a finance or tax function who has to say which of their own entities is caught and by when, and who has discovered that the vendor summaries disagree with each other in small ways that turn out to matter.
Every country piece is built the same way so that they can be read against one another: what the law actually obliges, how the scope test is drawn, what changes on each staged date, what the format and channel requirements are, and what happens when the obligation cannot be met. Dates are given with the instrument that fixes them and the status of that instrument, because a mandate that has been announced, one that has been legislated and one that is in force are three different things and have been confused in print more than once. Where a Member State moved before the VAT Directive was amended, the derogation that permitted it is named. The mechanics of the document itself sit in standards and formats, and how it travels is in networks and transmission; the library lists everything on the site on one page.
E-invoicing in Europe explained: the EU requirements and regulations, when e-invoicing becomes mandatory, and which national law actually obliges your business.
Every date below is taken from the country article linked in its row, which names the instrument that fixes it and links to the administration's own page. A date marked adopted is in published law; one marked proposed is not yet law and has moved before. For the framework these national laws sit inside — what the EU itself requires and what it leaves to each Member State — read what is actually mandatory in Europe.
Italy and Hungary are not in the calendar because their obligations have applied for years: see Italy's SdI clearance and Hungary's real-time invoice reporting. Dates in this list are revised when the underlying instrument changes, not before.
The analysis underneath the anchor piece.
Belgium's B2B e-invoicing mandate has applied since 1 January 2026: structured invoices between Belgian businesses over an existing network, with no state platform.
For a decade, a Member State that wanted to mandate e-invoicing had to ask the Council for permission. That requirement shaped every national mandate in Europe, and it has now been removed.
The EU e-invoicing directive, 2014/55/EU, obliges public bodies to accept invoices built to EN 16931 but obliges no supplier to send one. What it requires, and from when.
France's e-invoicing reform applies from September 2026: licensed platforms carry the invoice, and a separate e-reporting duty catches what invoicing does not.
Germany's B2B e-invoicing mandate: every business has had to receive structured invoices since 2025, issuing follows in stages to 2028, and there is no central platform.
Italy's SdI exchange system has cleared domestic B2B invoices longer than any system in Europe. How it works, what an SdI code is, and what is still difficult.
Poland's KSeF mandate routes every domestic B2B invoice through one state system, from February 2026 for the largest taxpayers and April 2026 for everyone else.
Romania cleared every domestic B2B invoice through a state platform from 2024 and added consumer sales in 2025, on a European format and a tight timetable.
Spain legislated a business-to-business e-invoicing obligation and then made it wait for an implementing regulation, while two other obligations arrived in the meantime.