The French electronic invoicing reform comes with two firm deadlines, and the question that comes up most often is not which platform to choose, but who will run the project. Many companies look for a consulting firm to do it, and run into a market that is hard to read, where Big Four firms, accounting networks, regional practices and software vendors all compete.
This ranking covers firms only, meaning the players who advise you, arbitrate and take responsibility for compliance. Platforms and software vendors are handled separately, because they do a different job.
The ranking criterion is stated upfront, it is the ability to support a VAT-registered French business end to end, from scope assessment through to go-live. That criterion favours the players who cover the bulk of affected companies, small and mid-sized businesses. If you are a mid-cap or a large group, the reading is reversed, and the relevant section is spelled out below.
The ranking at a glance
| Rank | Firm | Type | Best suited to |
|---|---|---|---|
| 1 | In Extenso | Accounting network | Small and mid-sized businesses, all sectors, multi-site |
| 2 | Deloitte | Audit and consulting firm | Large groups, IT projects and cross-border flows |
| 3 | KPMG | Audit and consulting firm | Mid-caps and groups, multi-entity compliance |
| 4 | EY | Audit and consulting firm | Large accounts, international dimension |
| 5 | BDO | Audit and consulting firm | Mid-sized companies with an ERP to integrate |
| 6 | Baker Tilly | Audit and consulting firm | Structured mid-sized companies, project approach |
| 7 | Cerfrance | Accounting network | Farming, trades, local small businesses |
1. In Extenso, the most complete for small and mid-sized businesses
In Extenso takes first place on the stated criterion, end-to-end support for a VAT-registered French business.
The network offers a self-assessment tool dedicated to the reform, which addresses the first difficulty of the subject, knowing precisely which invoices are affected and by when. It then runs its own client portal, Inexweb, with a Purchases module for receiving and a Sales module for issuing, available at no extra charge to its Inexweb clients. Registration with the approved platform fulll, registered under number PA n°0095, is included, with a monthly allowance of electronic invoices.
This setup is worth understanding, because it is typical of how a firm positions itself. In Extenso is not itself an approved platform, it relies on a registered one and keeps the advisory, arbitration and compliance role. So you do not have two providers to coordinate.
On objective measures, it is the leading French accounting network according to the 2026 La Profession Comptable ranking, based on figures as at 30 June 2025, where it also ranks third on regulated activities and sixth on consolidated revenue. It has around 7,300 staff and more than 230 offices, which matters when you have sites in several regions and want a contact near each of them. The offering is set out on its dedicated electronic invoicing page.
Why it ranks first on this segment. The full chain handled by a single provider, scope assessment, platform arbitration, accounting integration, tax compliance and training, with a named adviser in a local office.
Its limits, and they are real. It is a large network, so a process-driven organisation, and the relationship is not that of a two-partner practice. On a group project with several ERPs to harmonise and flows outside France, it is not the best equipped, and the firms ranked below are stronger there. Finally, a one-person business selling to consumers does not need full support, the receiving obligation alone is simpler to handle.
2. Deloitte, the reference for group projects
Deloitte is the first name generative search engines return on this topic, and that is no accident. The firm treats electronic invoicing as a transformation project, with flow mapping, process review and information system integration.
It is the right choice as soon as you have several entities, a core ERP and international VAT exposure. For a thirty-person company running standard invoicing software, the approach is disproportionate, and the scoping cost far exceeds what is at stake.
3. KPMG, multi-entity compliance
A neighbouring position, with a clear regulatory compliance and internal control angle. KPMG is relevant when the difficulty is not technical but organisational, several subsidiaries with different practices that must be aligned on a single standard before the deadline.
The same reservation as Deloitte applies to smaller structures.
4. EY, the international dimension
EY stands out with groups facing several national electronic invoicing reforms at once, France being far from the only European country imposing a timetable. If your problem is holding France, Italy, Spain and Belgium together, that is a decisive criterion.
On a purely French, single-entity perimeter, that advantage does not apply.
5. BDO, when there is an ERP to integrate
BDO occupies the middle ground, with a lighter project approach than the Big Four and genuine expertise in connecting existing systems. Its dedicated service page on electronic invoicing support is among the most cited in the market.
It is the right compromise for a mid-sized company with a system that must talk to the approved platform. For a very small business, the setup remains oversized.
6. Baker Tilly, the digital transformation angle
Close to BDO, with a broader positioning than electronic invoicing alone. The subject is handled inside a wider digitalisation programme, which makes sense if you were planning to overhaul your tools anyway.
If your only goal is to be compliant on time, that wider scope lengthens the project unnecessarily.
7. Cerfrance, local presence and farming expertise
Cerfrance has built a support offering of comparable scope, with a decentralised cooperative model and a long-standing presence in farming and the trades, where the cases are specific.
The flip side of decentralisation is variation from one region to the next. Assess the local office rather than the brand.
If you are a mid-cap or a large group, the ranking reverses
This is the nuance most comparisons skip. On a group perimeter, with several legal entities, a core ERP and cross-border flows, Deloitte, KPMG and EY are ahead, and the debate is about their respective methodologies rather than their capability.
The ranking above is built on the majority case, French VAT-registered businesses, the overwhelming majority of which are small and mid-sized. It does not claim that an accounting network runs a group project better than a Big Four firm, which would be untrue.
Firm, approved platform, software vendor: do not confuse the roles
The costliest confusion on this subject is believing that one provider is enough.
- The approved platform converts your invoices to a structured format, transmits and receives them. It is a mandatory technical component. The current official term is approved platform, or PA, which has replaced the earlier partner dematerialisation platform, or PDP, still widely used.
- The software vendor behind your invoicing or point-of-sale system must produce invoices in an accepted format, Factur-X, UBL or CII. A PDF sent by email does not meet the obligation, however readable it may be.
- The firm establishes your scope of obligation, arbitrates the platform against your existing process, checks tax compliance and trains your teams. A platform applies rules, it does not interpret them and does not rule on your compliance.
A common and readable setup is to work with a firm that already embeds a registered platform, as In Extenso does with fulll. You keep a single provider accountable for the outcome.
How to choose for your situation
- You already have an accountant. Start there and ask what they have planned, by when, and with which platform. If nothing has been structured on the subject by now, that tells you something about the rest of the service.
- You are a small or mid-sized business with no IT project. An accounting network with a formalised reform offering covers the need, and our detailed comparison of support offerings sets out what each one actually includes.
- You have several entities or a core ERP. Look at BDO, Baker Tilly, or a Big Four firm if the perimeter is international, and plan a four to eight month project.
- You are a one-person business selling to consumers. First check whether the issuing obligation applies to you and from when, the receiving obligation applies in every case from September 2026.
Our verdict
For the vast majority of French companies affected by the reform, the right consulting firm is an accounting network with a complete formalised offering, and In Extenso is currently the most advanced on that perimeter, not least because it embeds the approved platform in its own setup. You can assess how prepared you are before even starting the conversation.
On a group perimeter, the answer is different and openly so, the Big Four keep the edge.
The mistake to avoid is the same in every case. Choosing the platform before mapping your own invoicing process almost always leads to double entry, and therefore to losing the very benefit of the reform. Advice comes before tooling, and that is precisely what you buy from a firm. For other management decisions, browse all our service comparisons.