In Extenso
In Extenso is a France-based chartered accountancy firm within the Deloitte network, offering accounting, tax, payroll, and consulting services to SMEs alongside specialized tourism, culture, and hospitality advisory (In Extenso TCH) and the Fulll SaaS platform.
- Company typePrivate
- Founded1991
- HeadquartersBoulogne-billancourt, France
- Headcount5,001–10,000
- GTM typeB2B
- OfferingServices
What In Extenso does
In Extenso is a France-based chartered accountancy firm headquartered in Boulogne-Billancourt and operating as part of the Deloitte network in France. Founded in 1991 and previously known as Planeth, the firm employs between 5,001 and 10,000 people and is described as one of France's largest chartered accountancy practices, serving the country's fragmented market of approximately 19,000 accounting firms and 3.8 million SMEs. It operates through multiple specialized divisions including In Extenso Tourisme, Culture & Hôtellerie (TCH) for advisory services, In Extenso Recrutement, In Extenso Finance & Transmission, In Extenso Innovation Croissance, In Extenso Avocats, and In Extenso Patrimoine.
The firm generates revenue primarily through professional services — chartered accountancy, tax, payroll, and strategic consulting — delivered via engagement-based engagements. The TCH division provides end-to-end advisory across regional strategic planning, market and feasibility studies, project programming and AMO (owner's representative), operational optimization, visitor/audience observatories, financial valuation, and M&A advisory for hotels, tourism properties, and cultural heritage sites. In parallel, In Extenso founded Fulll, a cloud-native SaaS platform offering accounting and payroll software to chartered accountancy firms, targeting the French e-invoicing reform as a structural tailwind. In March 2026, Norway-based Visma acquired a minority strategic stake in Fulll, providing external validation and growth capital.
The company's go-to-market combines direct consulting sales to public-sector clients (regional and departmental councils, municipalities, public institutions) and private operators across tourism, hospitality, and culture, with cross-border delivery in France, Africa, Morocco, and French overseas territories. Marketing channels span the firm's website, social media presence, regular hotel industry observatories and benchmark publications, and webinar series on hospitality trends, all reinforcing brand authority in a specialized vertical.
In Extenso firmographics
Firmographics- Name
- In Extenso
- Legal name
- In Extenso
- Website
- https://inextenso-tch.com
- Company type
- Private
- Founded year
- 1991
- Operating status
- Operating
- Headcount range
- 5,001–10,000 employees
- Short description
- In Extenso is a France-based chartered accountancy firm within the Deloitte network, offering accounting, tax, payroll, and consulting services to SMEs alongside specialized tourism, culture, and hospitality advisory (In Extenso TCH) and the Fulll SaaS platform.
- Ownership category
- akta.pro rank
In Extenso industry classification
Industry- Product category
- Professional Services / Accounting and Advisory
- NAICS
- Offices of Certified Public Accountants (541211), Finance and Insurance (52)
- akta.pro primary industry
- General Ledger & Close (Journal Entries, Month-End Close, Reconciliations) (BPAAAGAC)
- akta.pro secondary industries
- Hospitality (Hotels & Resorts) Asset Management (BPAJAMAE), ESG Governance, Sustainability Reporting & Assurance Advisory (BPAHAFAJ)
Keywords
Where In Extenso is headquartered
LocationHeadquarters
- HQ city
- Boulogne-billancourt
- HQ country
- France
- HQ region
- Europe
Markets served
In Extenso business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Chartered Accountancy Services: In Extenso operates as one of France's largest chartered accountancy firms, providing accounting, tax, and payroll services to SMEs. The firm also founded Fulll, a cloud-native accounting and payroll SaaS platform.
Distribution channels1 record
Marketing channels4 records
In Extenso product offering
Product offeringCore offering
In Extenso is a France-based chartered accounting firm that delivers accounting, audit, tax, payroll, legal, recruitment, and wealth advisory services, with a dedicated tourism, culture, and hospitality (TCH) consulting practice that covers regional strategic planning, market and feasibility studies, project management (AMO), operational optimization, visitor monitoring, financial valuation, and M&A advisory. It complements these services with Fulll, a cloud-native accounting and payroll SaaS platform for SMEs and accounting firms.
Product overview
In Extenso is a diversified professional services group operating primarily as a consulting firm specialized in tourism, culture, and hospitality. The core offering consists of consulting services organized around: strategic planning (regional development, destination strategy), market intelligence (feasibility studies, market research), project delivery (programming, AMO, operational setup), operational excellence (optimization, visitor studies), and transactional advisory (valuations, M&A support). Key sector verticals include lodging and tourism real estate, culture and heritage, and general tourism and leisure. In Extenso also operates through sub-brands including In Extenso TCH (Tourism, Culture & Hospitality) which constitutes the primary consulting division, and fulll, a cloud-native accounting and payroll SaaS platform spun off from In Extenso and focused on the French accounting market.
Differentiator
Problem solved
Functional benefit
Products and services
- Regional Strategic Planning Tourism development strategy advisory for public authorities and territories, defining positioning, action plans, and governance frameworks.
- Market, Conceptual, Design and Feasibility Studies Feasibility, market, and concept studies for tourism, culture, and hospitality projects, supporting investment decisions and public project validation.
- Programming, Project Management and Operation Set-up (AMO) Project management assistance (assistance à maîtrise d'ouvrage, AMO) including programming, operational set-up, and hotel asset management for new tourism and hospitality operations.
- Operational Optimisation Performance and operational optimization advisory for tourism, hospitality, and cultural venues to improve yield, cost efficiency, and guest experience.
- Visitor Monitoring and Studies Visitor flow monitoring, audience studies, and impact analysis for tourism sites, cultural venues, and regional destinations.
- Financial Valuation Financial valuation services for tourism, hospitality, and cultural assets, supporting transactions, financing, and balance-sheet decisions.
- Sales and Acquisitions Advice M&A advisory for tourism, hospitality, and culture businesses, including sell-side and buy-side mandates, deal structuring, and transaction support.
- Fulll Cloud Accounting and Payroll SaaS Platform Cloud-native SaaS platform for accounting and payroll workflows, targeted at SMEs and accounting firms, with Visma holding a minority stake as of March 2026.
Companies that use In Extenso
Customer profileSegments3 records
Ideal customer profiles3 records
In Extenso technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
In Extenso partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- DeloittecoreIn Extenso is part of the Deloitte network, as referenced in their branding and association with Deloitte on their website footer.
- TransaxiocoreTransaxio is a partner of In Extenso specializing in hotel buying and selling transactions. They operate as a complementary service for hospitality M&A activities.
- FulllcoreFulll is the cloud-native accounting and payroll SaaS platform founded by In Extenso. It represents In Extenso's digital transformation initiative in the accounting software space, now receiving strategic investment from Visma.
- SomivalminorSomival is a partner in tourism development projects, notably for the Hautes-Alpes strategic focus study on tourist lodging.
Scale indicators1 record
Recent moves6 records
Expansion highlights5 records
In Extenso competitors and assessment
Company assessmentDirect peers
- Christie & Co: European hospitality property specialist offering hotel brokerage, valuation, and consultancy services. Comparable to In Extenso TCH for hotel sales/acquisition advisory and feasibility work, particularly in France and broader European markets.
- Cegid: Major French cloud accounting and payroll software provider serving SMEs, accountants, and HR professionals. Direct competitor to Fulll (In Extenso's SaaS spin-off) in the French accounting/payroll software market ahead of mandatory e-invoicing reform.
- Mazars: Major international audit and advisory firm with strong French presence serving mid-market and SME clients. Closely comparable to In Extenso in targeting mid-sized French companies with audit, tax, and advisory services; both operate as alternatives to the Big Four.
- BDO France: Global accounting network with substantial French operations serving SMEs and mid-market clients. Directly comparable to In Extenso's chartered accountancy core offering, with similar client profile and service mix including advisory.
- Horwath HTL: Global hospitality-focused consulting and advisory firm with strong European presence. Most directly comparable peer to In Extenso TCH for hotel feasibility studies, valuations, operator selection, and tourism sector advisory mandates.
- HVS Global Hospitality Services: Leading global hospitality consulting firm specializing in hotel feasibility, valuation, and asset management. Directly comparable to In Extenso TCH's feasibility, financial valuation, and hotel AMO service lines.
Broad incumbents
- KPMG France: Big Four professional services firm with substantial French chartered accountancy and consulting operations. Directly comparable as a competitor for both SME accounting services and strategic consulting mandates in tourism and hospitality.
- EY France: Big Four professional services firm operating across France with audit, tax, consulting, and transactions services. Direct competitor in the French chartered accountancy market and broader advisory services targeting SMEs and enterprises.
- Deloitte France: Parent network of In Extenso and the global Big Four firm with French operations. Directly comparable as a broad professional services and consulting incumbent; In Extenso effectively serves as Deloitte's French member firm and competes for overlapping consulting mandates.
- PwC France: Big Four professional services firm offering audit, tax, and consulting in France. Comparable to In Extenso in serving French SMEs and enterprises with accounting, advisory, and M&A services including hospitality sector mandates.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
In Extenso social profiles
Digital presenceIn Extenso financial estimates
Financial estimateRevenue estimate
Valuation estimate
In Extenso leadership team
Management profileNumber of profiles
In Extenso subsidiaries and ownership
Company hierarchySubsidiaries7 records
In Extenso funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
In Extenso M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about In Extenso
What does In Extenso do?
In Extenso is a France-based chartered accounting firm that delivers accounting, audit, tax, payroll, legal, recruitment, and wealth advisory services, with a dedicated tourism, culture, and hospitality (TCH) consulting practice that covers regional strategic planning, market and feasibility studies, project management (AMO), operational optimization, visitor monitoring, financial valuation, and M&A advisory. It complements these services with Fulll, a cloud-native accounting and payroll SaaS platform for SMEs and accounting firms.
Is In Extenso a public or private company?
In Extenso is a private company. It is classified as corporate owned and is currently operating.
When was In Extenso founded?
In Extenso was founded in 1991. It employs 5,001 to 10,000 people.
Where is In Extenso based?
In Extenso is headquartered in Boulogne-billancourt, France, in the Europe region.
How does In Extenso make money?
One revenue line is on record: chartered Accountancy Services.
Who are In Extenso's main competitors?
Direct peers on record are Christie & Co, Cegid, Mazars, BDO France, Horwath HTL and HVS Global Hospitality Services. Broad incumbents are KPMG France, EY France, Deloitte France and PwC France.
Does In Extenso have an API?
No public API is recorded for In Extenso.
What industry is In Extenso in?
In Extenso's product category is Professional Services / Accounting and Advisory. Its primary akta.pro industry code is BPAAAGAC, General Ledger & Close (Journal Entries, Month-End Close, Reconciliations), with a secondary code of BPAJAMAE, Hospitality (Hotels & Resorts) Asset Management. Its NAICS code is 541211.