In Extenso review: a French accountancy group

When a company director looks for a review of In Extenso, they rarely want a score out of five. They want to know what the firm actually covers, how far it goes beyond bookkeeping, and whether their own structure matches the network.

Here is what In Extenso is, exactly what the group offers, and the situations where it makes the most sense.

In Extenso at a glance

What the 2026 ranking says

The 2026 ranking by La Profession Comptable magazine, based on figures as of 30 June 2025, places In Extenso first in French chartered accountancy. The group also appears third on regulated activities, which cover chartered accountancy and statutory auditing, and sixth by consolidated revenue among French groups.

This reading is useful because it positions the firm precisely. In Extenso is a generalist network on the micro-business and SME segment, which is a market position of its own.

The service range, in detail

In Extenso does not sell an accounting service, it covers a company’s entire life cycle. Here is the actual map.

At start-up

• Business creation and takeover, from choosing the legal structure to the financial forecast
• Acquisition advisory, for buying a business or shares

Day to day

• Accounting and bookkeeping
• Payroll and employment administration, including collective agreements and social filings
• Tax and filings
• Legal, with a dedicated law firm entity
• Audit and statutory auditing
• Electronic invoicing, now a central topic with the mandate coming into force
• CSR
• Professional training
• Support for in-house finance departments, for companies with an internal accounting team

To grow

• Management and performance monitoring, with dashboards and reporting
• Wealth management, delivered by In Extenso Patrimoine
• Innovation advisory, notably on R&D funding schemes
• Risk management advisory
• Prevention and restructuring advisory, for companies in difficulty
• Financing advisory
• International development and setting up in France for foreign companies

At exit

• Business sale, acquisition and transfer

That breadth is the network’s real argument. A director preparing a sale in three years, weighing salary against dividends, and needing a statutory audit can deal with one group that brings these areas of expertise together.

Inexweb, the client platform

Inexweb is the group’s client portal. It centralises accounting documents, management reporting and exchanges with the local office advisor, as at the Isneauville branch featured in our reviews of chartered accountants in Rouen.

The notable point is the existence of sector-specific versions rather than one generic tool. Inexweb for construction, automotive, retail, wholesale and point of sale each carry indicators specific to the trade. A garage and a wholesaler do not track the same ratios, and each version is built around the indicators of its trade.

The group’s specialist entities

In Extenso operates as a set of entities, which explains the depth of its offer on topics a generalist firm usually subcontracts.

• In Extenso Patrimoine, director’s wealth management
• In Extenso Avocats, legal advisory and litigation
• In Extenso Social, payroll and employment administration
• In Extenso Finance, financial transactions and transfers
• In Extenso Innovation Croissance, innovation funding
• In Extenso Économie Sociale et Solidaire, associations and social economy organisations
• In Extenso Tourisme, Culture et Hôtellerie, tourism and hospitality
• Ad Astra, Money Flow, Transaxio Hôtel and fulll, on complementary expertise and tools

Client profiles served

The group organises its support by profile, with teams that know the specifics of each trade.

Agriculture, trades and retail, construction, cafés hotels and restaurants, founders and buyers, works councils, social economy, companies in difficulty, foreign companies, franchisors and franchisees, SMEs, independent professionals, athletes and sports clubs, start-ups.

This profile-based entry matters more than it looks. The most common complaints about accounting firms rarely concern accounting technique, they concern not understanding the client’s trade. An advisor handling ten restaurants understands a restaurant’s seasonality and payroll structure.

Who In Extenso suits

• An SME with employees. As soon as there is payroll, a collective agreement to apply and social filings, the value of a structured network becomes obvious. That is precisely the part no automation replaces.
• A multi-site or growing company. Geographic coverage means an advisor close to each site.
• A director anticipating a sale or a transfer. Having wealth, legal and financial expertise inside one group avoids shuttling between advisors.
• A business with a strong sector profile. Construction, automotive, retail, hospitality, agriculture, with matching tools and specialists.
• A foreign company setting up in France, or a French company expanding abroad.

Other profiles

In Extenso is most relevant when needs go beyond bookkeeping.

• A micro-business in stable management, with no employees and no particular tax issues, also benefits from In Extenso’s support, and the network shows its full value as soon as needs broaden.
• A director looking for comprehensive support. In Extenso’s strength lies in the breadth of its offer.
• Someone who values a close relationship. The group relies on proven processes, with a named local advisor ensuring proximity.

In one sentence

In Extenso is the coherent choice when the need goes beyond accounting, meaning as soon as there are employees, a project or a deadline to prepare.

To go further, see our comparison of the best chartered accountancy firms, our analysis of choosing an accounting firm for electronic invoicing and our guide to outsourcing payroll and employment administration.