E-invoicing exposes your documentation

The quick timeline

For the record: electronic invoicing has been mandatory for all French businesses on the receiving side since September 2026, and on the issuing side rolled out progressively by size (large companies and mid-caps first, SMEs next, small businesses last).

Core of the system: every B2B invoice flows through a certified platform (PDP), which transmits tax data to the administration in real time.

The real shift is traceability

Beyond the technical flow, the reform changes what clients expect. From now on, your client expects to verify at any moment:

• Why a given entry was booked this way.
• Which supporting document is attached.
• Why their VAT status is what it is.
• Which discount or exception was applied and on what basis.

Before 2026, the client asked these questions twice a year. Today, they ask them every month — because the data is in front of them, instantly.

Three new pressures on documentation

1. The pace of questions explodes

Where you handled 30 documentation requests per month, you now handle 80 to 120. Volume breaks your front desk if you stay manual.

2. Expected precision rises

Before: “tell me from memory.” Today: “cite the exact document.” The client has seen their banker do it with statements; they expect the same standard from their firm.

3. The response window shrinks

Before: 24 to 48 hours to reply. Today: anything over half a day feels like a service lapse to the client.

Absorbing the pressure with an AI assistant

Three assistants to roll out, in this order:

1. Client assistant fed with the complete file of each client (invoices, journal entries, agreements, engagement reports). Watertight per client.
2. Doctrine assistant fed with your technical base (memos, case law, internal classification). Shared across staff.
3. Firm assistant fed with internal procedures (engagement framing, methodologies, templates). For new hires.

Step-by-step in Accounting firms: three assistants to build before summer. Documentation audit method in Good documentation makes a good assistant.

The firm’s role isn’t replaced, it’s raised

Common question: if the assistant answers client questions, what is the firm for?

Pragmatic answer: the assistant absorbs the bottom of the pyramid (retrieval, reference, simple classification). The firm recovers time for the top of the pyramid — strategic advice, optimization, anticipation. That is to say the part where you actually add value.

Across the firms we support, the ratio of billable hours spent on advisory (vs. reporting) gains 8 to 15 points in the first year. See also our accounting firms page.