Yes, a PDF invoice is still valid in 2026, but the answer now depends on where you and your customer are based. In France, a new e-invoicing mandate takes effect on 1 September 2026 for invoices between French businesses, and a plain PDF sent by email will no longer qualify. In the UK, PDF invoices remain perfectly legal until April 2029, when a similar mandate arrives. Here is what actually changes, in plain terms, and what to do about it before the deadlines do it for you.
What changes in France on 1 September 2026
From 1 September 2026, every business subject to French VAT must be able to receive electronic invoices through government-registered platforms. Large and mid-sized companies must also issue their invoices this way from the same date. Smaller businesses get one extra year, until 1 September 2027, before the issuing obligation reaches them.
The key point for anyone used to attaching a PDF to an email: that habit stops counting as invoicing between French businesses. An electronic invoice under the French reform is a structured file, transmitted through an approved platform, in one of three accepted formats. Two of them, UBL and CII, are pure data formats with no visual layer at all. The third one is where it gets interesting for PDF users.
Factur-X: the PDF that is also an e-invoice
France's third accepted format, Factur-X, is a hybrid. On the outside, it is a normal PDF: your accountant opens it, reads it, files it, exactly as before. On the inside, it carries a structured XML data file that accounting systems process automatically. One file, readable by people and by software at the same time.
Technically, Factur-X is built on PDF/A-3, the archival flavour of PDF that allows other files to be embedded inside the document. That detail matters in practice: a Factur-X invoice is self-contained. It does not need a specific platform or viewer to remain readable in ten years, which is precisely what archiving rules ask of your invoices.
And in the UK?
The UK is heading the same way, on a slower clock and with a stricter definition. At Autumn Budget 2025, the government confirmed that from April 2029, VAT invoices between businesses, and from businesses to government, will have to be issued and received electronically. In June 2026, HMRC confirmed that the system will run on Peppol, an international network already used in several European countries, with the detailed roadmap due at Budget 2026 in November.
One choice stands out: the UK definition of e-invoicing explicitly excludes PDFs, Word files and scanned images, even machine-readable ones. Unlike France, the UK has not given a hybrid PDF format a place in its core framework. British businesses have time, but the direction of travel is set, and it points away from the emailed PDF.
Three things to do before the deadlines
First, work out which side of the rules you are on. The French mandate covers invoices between businesses established in France. If you are a UK business invoicing French clients, your invoices are not directly caught by it, but your French clients live under new reporting obligations, and many will start asking their suppliers for structured formats.
Second, ask your invoicing software two questions: can it receive invoices through a French registered platform, and can it produce structured formats such as Factur-X? If you run a small French business, the September 2026 receiving deadline applies to you even if your own issuing obligation only starts in 2027.
Third, do not throw away your PDF workflow. Your invoices will keep a human-readable life: as the visible layer of a Factur-X file in France, as the everyday format for B2C and international billing, and as the document you actually open when a question comes up three years later. The PDF is not disappearing from invoicing; its legal role is being redefined.
FAQ
Can I still email a PDF invoice to a French business client?
If your business is established outside France, yes: cross-border invoices are not covered by the domestic French e-invoicing mandate, although your client may request a structured format for their own processes. If both businesses are established in France, no: from 1 September 2026 invoices must travel through registered platforms in an accepted structured format.
What exactly is Factur-X?
A Franco-German hybrid invoice format: a PDF/A-3 document with an embedded XML data file. Humans read the PDF layer, accounting systems read the XML layer, and both layers are the same legal invoice.
Do UK businesses need to change anything today?
Legally, nothing changes before April 2029. Commercially, the calendar is shorter: suppliers invoicing into France, Belgium and other mandated markets are already being asked for structured invoices, and the UK roadmap arriving in November 2026 will set the technical expectations early.
Are PDF invoices still fine for record-keeping?
Yes, and this is where PDF remains strongest. UK rules require invoices to be kept for six years in a readable form, and an archival PDF is readable on its own, decades on, without depending on any platform. Pure data formats need software around them to stay legible; a PDF does not.
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