Auto-Entrepreneur Invoicing Rules Explained (2026 Update)

The invoice rules that predate the e-invoicing reform — and still trip people up

Before France's e-invoicing mandate even enters the picture, there's a simpler problem: a lot of auto-entrepreneur invoices are already missing mandatory information, and most freelancers don't find out until a client's accounting department bounces one back, or worse, until a tax audit asks for it.

This is the baseline — the mandatory mentions every auto-entrepreneur invoice needs regardless of format, plus the mistakes I see most often. The 2026-2027 e-invoicing changes (I've written about the timeline separately) layer additional structured-format requirements on top of this, not instead of it.

"This is general guidance, not tax advice specific to your situation — when in doubt, your accountant or impots.gouv.fr has the final word."

The mandatory mentions, in full

Every invoice you issue as an auto-entrepreneur needs to include:

• A unique, sequential invoice number — no gaps, no reused numbers. Most tax authorities treat a broken sequence as a red flag.
• The issue date and, if different, the date the service or delivery was completed.
• Your identity — full name (or business name if you have one), address, and SIREN number.
• Your client's identity — name and address, and their SIRET if the client is itself a registered business.
• A description of what you sold — nature of the service or product, quantity, and unit price before tax.
• The total amount due.
• The VAT mention — most auto-entrepreneurs operate under the "franchise en base de TVA," which means the invoice must state "TVA non applicable, article 293 B du CGI" rather than charging VAT. If you've crossed the VAT threshold and now charge it, the rate and amount need to be broken out explicitly instead.
• Payment terms — due date and, for B2B invoices, the late-payment penalty rate that applies if the client pays late.
• The €40 fixed compensation clause — French law requires B2B invoices to state that a flat €40 recovery fee applies in case of late payment, separate from any penalty interest.

The mistakes I see most often

Forgetting the VAT exemption mention entirely

This is the single most common gap. It's an easy line to forget when you're building your own invoice template from scratch, and it's the first thing that looks unprofessional to a client's finance team — or draws attention during a tax review.

Renumbering or skipping invoice numbers

Deleting a draft invoice and reusing its number, or restarting numbering mid-year without a clear convention, creates exactly the kind of inconsistency that turns a routine check into a longer one. Pick a numbering scheme once — year-sequential is the simplest — and never break it.

No late-payment terms on B2B invoices

Freelancers often leave payment terms vague to avoid seeming aggressive with a new client. Contractually, that's backwards: the late-payment penalty and €40 recovery clause aren't optional extras, they're what gives you standing to actually chase a late payment later.

Not keeping invoices for the full retention period

Invoices and supporting records need to be kept for 10 years in France. A spreadsheet on a laptop that gets replaced in three years isn't a retention strategy.

Where this is heading

None of this goes away under the 2026-2027 e-invoicing reform — it gets layered on top of a structured format requirement (Factur-X, UBL, or CII) delivered through an approved platform. The mandatory mentions above still need to be present; they just need to live inside a machine-readable structure instead of a free-form PDF.

Practically, that means the cleanest path is a tool that gets both right at once — the legal content and the delivery format — rather than fixing your invoice template today and re-fixing it again next year.

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