This list does not replace proper support. It is there to tell you, in ten minutes, where you really stand.
First of all: getting connected
- Choose an approved platform, or check that your accountant provides one.
- Confirm that it handles both receiving and issuing.
- Check that it archives invoices for the legal retention period.
The data to clean up
This is the most thankless step, and the one that sets your rejection rate.
- A valid SIREN number for every business customer.
- A complete, up-to-date billing address.
- The intra-EU VAT number for European customers.
- Removing duplicate customer records.
The new mandatory invoice details
Four pieces of data are added to the ones you already put on your invoices: from 1 September 2026 for large and intermediate-sized companies (ETI), from 1 September 2027 for SMEs, small and micro businesses.
Detail
Customer’s SIREN number
- What it is
- For VAT-registered customers established in France
Detail
Delivery address
- What it is
- When it differs from the billing address
Detail
Type of transaction
- What it is
- Supply of goods, provision of services, or both
Detail
Option to pay VAT on debits (invoicing basis)
- What it is
- Where applicable, stated explicitly
| Detail | What it is |
|---|---|
| Customer’s SIREN number | For VAT-registered customers established in France |
| Delivery address | When it differs from the billing address |
| Type of transaction | Supply of goods, provision of services, or both |
| Option to pay VAT on debits (invoicing basis) | Where applicable, stated explicitly |
The test that beats every audit
Issue a real invoice to a real customer, through the platform, and follow its life cycle until payment. Whatever breaks, breaks then — not on deadline day.
After the switch
- Watch rejection statuses during the first month.
- Decide who handles a rejection, and how fast.
- Keep the old channel running alongside for one full cycle.