Definition
A freelance copywriter switches invoicing software in September. The brand-new tool issues its first document as invoice 0001.
She had already sent fourteen since January, and one of them carried exactly that number.
Two different documents are now circulating with the same reference, in the same year, at two clients who have never met.
Invoice numbering is the rule requiring every Invoice to carry a unique number, assigned when it is issued, those numbers forming a chronological and continuous sequence.
The official page on mandatory invoice details states it in one line, and article 242 nonies A of annex II to the French tax code carries it: one number per invoice, never the same one twice, never a gap in the sequence.
That number is one of the Mandatory invoice details, alongside the issue date, your identity, the client's identity and the description of the work.
Under the franchise en base, the VAT basic exemption, it sits next to the no-VAT wording.
For that wording, the Bulletin officiel des finances publiques, the official tax doctrine, accepts three formulations rather than a single one.
The most common remains "TVA non applicable, article 293 B du CGI" until 31 December 2026.
On 1 January 2027, VAT rules move into a new code and it becomes "TVA non applicable, article L. 233-3 du CIBS".
What a valid sequence is allowed to do
No format is imposed. What counts is continuity, not elegance: a plain run of digits does the job, and so does a year prefix.
Separate series are accepted where the way you work justifies them, two clearly distinct activities for instance, provided each series stays continuous on its own.
| Numbering | What it is worth |
|---|---|
| 1, 2, 3, never resetting to zero | Valid, and the easiest to defend during an audit |
| 2026-001, 2026-002, then 2027-001 | Valid: the year is in the number, each yearly series stays continuous |
| CONS-2026-001 for consulting, TRAIN-2026-001 for training | Separate series, acceptable if the activity genuinely justifies them |
| SMITH-01, JONES-01, SMITH-02 | Rule it out: a per-client run is no longer chronological at all |
| 0001 after switching tools mid-year | Duplicate: two invoices carry the same number |
Restarting at 1 on 1 January is perfectly acceptable, on one condition: the year must be readable in the number. Without it, your invoice 001 for 2026 and the one for 2027 become indistinguishable the day someone goes looking for them.
Seven numbers, six invoices, one year of turnover
Take a consultant under the BNC (non-commercial income) rules who starts the year at 2026-001. She issues six invoices of €1,500, so €9,000 invoiced.
In April one job is cancelled: she issues a Credit note (avoir) of €1,500, which takes the next number, 2026-007, and repeats the number of the cancelled invoice.
A credit note number is only worth something if it quotes the number of the invoice it corrects, otherwise the two documents no longer answer each other.
The cancelled invoice stays in the sequence, visible, with its credit note facing it. Net invoiced drops to €9,000 - €1,500 = €7,500.
Her last invoice, issued on 20 December, is paid by transfer on 8 January.
She has therefore collected €7,500 - €1,500 = €6,000 within the calendar year, and that is the figure she declares.
The sum is €6,000 × 25.6% = €1,536 of social contributions at the 2026 rate for non-regulated liberal professions outside the Cipav.
That rate covers neither the vocational training contribution nor income tax.
Those €6,000 count towards the ceiling of €83,600 set for the years 2026 to 2028, not the €7,500 invoiced.
The sequence describes your documents, the Cash receipt decides your turnover, and seven numbers issued may well weigh only €6,000 declared.
The most expensive reflex is deletion. An invoice sent out with a wrong amount is never deleted and never renumbered: it is corrected by a credit note, which takes the next number.
Deleting leaves a gap in the sequence, and a gap is exactly what an audit looks at first, because it looks like revenue collected and then wiped.
Same vigilance when changing software: take control of the counter before issuing the first invoice from the new tool, or it will restart at 1 by itself.
If the duplicate has already gone out, it is repaired the same way: a credit note quoting the duplicated invoice, then that invoice reissued under the first free number in your run.
Quotations, deposits and credit notes: what belongs in the sequence
Your commercial documents do not all share the same counter.
The Quotation (devis) lives in its own numbering, which is free, and turning an accepted quotation into an invoice never carries its number over: the invoice takes the next one from its own run.
A Deposit invoice (facture d'acompte) is a full invoice: it consumes a number from the sequence, and the balancing invoice refers back to it so the client does not pay the same amount twice.
A credit note also consumes a number, either in the main run or in a dedicated series such as AV-2026-001, and both hold up as long as the choice does not change halfway through.
A proforma invoice, on the other hand, is not an invoice and has no business in the sequence.
Then comes the long game: these numbers are worth nothing if they no longer point to anything.
Document retention requires you to keep the invoices themselves, and an exported copy beats a cancelled subscription to software that hosts your entire invoicing history.
This page is up to date as of 5 September 2026.
Frequently asked questions
Can I restart at 1 every year?
Yes, provided the year appears in the number, in the form 2026-001 for example.
Each yearly series then stays continuous and no invoice can carry the same number as another one, which is the only outcome the rule is really after.
I skipped a number by mistake, what should I do?
Above all, do not renumber invoices already sent to clients, who may already have booked them.
Write down where the gap came from and carry on with your sequence: an explained gap defends itself easily, an unexplained one is the one that causes trouble.
Do invoices sent to private individuals need numbering?
Yes, the rule depends on the document rather than on the client.
As soon as you issue an invoice it joins the same sequence as the others, whether it goes to a company, to a public body or to a private individual paying for a one-off job.
Should a cancelled invoice stay in the numbering?
Yes, and that is the whole point of the method.
The original invoice keeps its number, the credit note cancelling it takes another one, and reading the sequence shows both the mistake and its correction, which a deletion would have erased without a trace.