How to Invoice French Clients as a UK or EU Freelancer in 2026

French tax rules can be confusing from abroad — and in 2026, the rules have changed significantly. If you are a UK, German, Dutch, or Spanish freelancer (or a small company) billing French businesses, you can no longer just attach a PDF to an email and call it done. France has rolled out one of Europe's most ambitious e-invoicing mandates, and even foreign suppliers are feeling the effect.

The good news: once you understand what is actually required, the process is straightforward. This guide covers everything you need to know to invoice French clients in 2026 — from the new Factur-X format to the exact data fields your invoice must contain, and the mistakes that trip up most foreign freelancers.

Why Invoicing French Clients Is Different in 2026

France's e-invoicing reform — known as the réforme de la facturation électronique — requires all B2B transactions between VAT-registered entities established in France to flow through certified electronic platforms called Plateformes de Dématérialisation Partenaires (PDPs). Large French companies have been able to receive structured invoices since September 2026, and the obligation to issue them is progressively extending to smaller businesses through 2027.

As a foreign freelancer or SME, you are not legally required to register with the French tax authority — but your French clients are increasingly expecting structured, machine-readable invoices. A plain PDF is no longer adequate for many large French businesses. If your invoice cannot be processed automatically, it risks being delayed, queried, or rejected — which means a delayed payment for you.

For a deeper look at the full 2026 timeline and what it means for companies outside France, see our article: E-Invoicing in France 2026: What Foreign Companies Need to Know.

What Is Factur-X and Why It Matters for Foreign Freelancers

Factur-Xis the invoice format at the heart of France's e-invoicing reform. It is a hybrid document: a standard, human-readable PDF combined with an embedded XML data file that your French client's accounting software can read automatically.

Why does this matter to you as a foreign freelancer? Because:

• It looks just like a normal PDF to a human — no special viewer needed on either side.
• Your French client can import it directly into their accounting software without re-keying data.
• It satisfies the structured-invoice requirement that large French businesses now expect from suppliers.
• For cross-border B2B invoices, the EN 16931 Factur-X profile is the safest choice — it carries all the fields required under the European e-invoicing norm.

Want to understand the format in more detail? Our dedicated guide explains everything: Factur-X for Dummies: A Guide for Non-French Businesses.

Step-by-Step: What You Need to Invoice a French Client

Before you create your first invoice, collect the following information from your French client. Without these, you cannot produce a compliant invoice.

1. Your Client's SIREN (or SIRET) Number

Every French company has a SIREN — a unique 9-digit identifier assigned by INSEE. Their full establishment identifier (SIRET) is 14 digits: the SIREN plus a 5-digit location code. For most invoicing purposes, the SIREN is sufficient, but if your client has multiple sites, ask for the SIRET of the specific establishment you are billing.

Why does this matter? Without the SIREN/SIRET, the invoice cannot be routed correctly through the French e-invoicing network, and your client's accounting software may refuse to process it. Ask for it before you start work — it avoids awkward conversations later.

2. Your Own VAT Number

If you are VAT-registered in your home country (UK, Germany, the Netherlands, Spain, etc.), include your VAT identification number on the invoice. It signals to your French client that you are a legitimate VAT-registered business and helps them apply the correct VAT treatment on their side.

Not VAT-registered? If your annual turnover exceeds your home country's VAT threshold, you should be. If you are genuinely below the threshold, state this clearly on the invoice and apply the reverse-charge mechanism (see below).

3. VAT Treatment for Cross-Border Services

For B2B services invoiced from a foreign freelancer to a French business, the general rule under EU VAT law is the reverse charge: you invoice with 0% VAT and add the mention "Autoliquidation — TVA due par le preneur conformément à l'article 283-2 du CGI" (or its equivalent in English: "VAT reverse charged to the recipient"). The French client then accounts for the VAT themselves.

Post-Brexit UK freelancers follow the same principle: you invoice without VAT and include a reverse-charge notice. Your French client handles the VAT. If in doubt, consult a tax advisor — getting this wrong can create headaches on both sides.

4. Mandatory Invoice Fields

French law (Article 289 of the Code général des impôts) requires all B2B invoices to contain:

• Full legal name and address of both seller and buyer
• Your VAT number (or a note that you are exempt)
• Your client's SIREN/SIRET number
• A unique, sequential invoice number
• Invoice issue date and date of supply (if different)
• Clear description of the services provided
• Quantity, unit price excluding VAT, and applicable VAT rate
• Total excluding VAT and total including VAT
• Payment due date and payment terms
• Late payment penalty rate and the €40 fixed recovery indemnity (required by French law for all B2B invoices)

5. The Invoice Format

For most foreign freelancers, Factur-X is the right choice. It is widely supported, easy to generate with modern invoicing tools, and accepted by all major French accounting platforms. You send a single file — a PDF with the XML embedded inside — and your client can process it automatically.

Common Mistakes to Avoid

These are the errors that most often delay payments or trigger complaints from French clients:

• Missing the SIREN/SIRET. This is the most common blocker. Without it, the invoice cannot be routed or matched in the French accounting system. Always ask before you start work.
• Sending a plain PDF. A standard PDF without embedded XML is no longer sufficient for most large French businesses. Even if your client accepts it today, they may be required to reject non-structured invoices in the near future.
• Wrong VAT treatment. Forgetting the reverse-charge mention — or incorrectly charging VAT on a cross-border B2B service — creates administrative problems for your French client and may require a corrective invoice.
• Omitting payment penalty clauses. French law requires all B2B invoices to state the late payment penalty rate and the €40 fixed recovery fee. Many foreign freelancers omit these because they are not required in their home country — but they are mandatory in France.
• Using the wrong Factur-X profile. Factur-X has several profiles (Minimum, Basic, EN 16931, Extended). For cross-border B2B invoices, use the EN 16931 profile — it carries all the fields the European norm requires.
• Invoice numbers that are not sequential. French law requires invoice numbers to follow a strictly sequential series with no gaps. Make sure your invoicing tool enforces this automatically.

How Bonne Facture Handles This for You

If juggling SIREN lookups, Factur-X profiles, and reverse-charge mentions sounds like a lot — it does not have to be. Bonne Facture is built specifically for this use case. You enter your client's details once (including their SIREN, which the tool validates), choose the right VAT treatment from a simple dropdown, and the platform generates a fully compliant Factur-X invoice — EN 16931 profile, all mandatory French fields included, payment clauses pre-populated. No accounting degree required. Whether you invoice one French client a month or fifty, the compliance layer is handled for you automatically.

Start Invoicing French Clients with Confidence

Invoicing French clients as a foreign freelancer does not have to be complicated. Once you have the right information (SIREN, VAT treatment, mandatory fields) and the right format (Factur-X EN 16931), you are fully equipped to invoice French businesses in a way they can process smoothly — and pay on time.

The key steps to remember:

1. Ask your French client for their SIREN/SIRET before starting.
2. Confirm the correct VAT treatment for your transaction type (usually reverse charge for cross-border B2B services).
3. Use an invoicing tool that generates Factur-X with all mandatory French fields pre-filled.
4. Include payment terms, late penalty rate, and the €40 recovery indemnity on every invoice.
5. Keep your invoice numbers strictly sequential.

Ready to get started? Bonne Facture makes it easy — you can create your first compliant invoice for a French client in minutes.