Accounting for French IT Services Firms: Day Rates, Subcontracting and EU VAT

A French ESN or IT consulting firm can grow revenue while losing margin if utilisation, subcontractors, bench time and EU VAT are not tracked properly. Founders often watch the day rate, but real financial control comes from mission margin, client payment cycles, staffing cost and contract quality.

This guide is for French ESN founders, IT consulting firms, software engineering agencies, data teams, freelance collectives and CFOs in tech services businesses. It complements our French ESN sector page, freelance consultant guide, EU VAT article and outsourced CFO service.

ESN accounting should connect commercial contracts, time records, client invoices, subcontractors, payroll and VAT. Without this chain, revenue can hide declining margins. Reporting should be monthly and mission-based, with cash visibility.

Freshness note: updated on 3 May 2026. VAT, subcontracting and umbrella employment rules must be checked against the client country, contract and provider status.

The day rate helps price projects and negotiate with clients. It does not show profitability by itself. A high day-rate project may be weak if it requires senior staffing, large coordination time, bench gaps or slow client payment.

Our accounting view: every project should show selling price, delivery cost, utilisation, margin, invoice status and expected collection date.

Subcontracting lets an ESN fill a skills gap or scale capacity quickly. It also creates documentation and compliance risk. The business should keep contracts, invoices, evidence of work, client approvals and required vigilance documents.

Control points:

• consistency between client purchase order and subcontractor agreement;
• confidentiality and IP clauses;
• liability and insurance;
• days or deliverables invoiced;
• vigilance documentation where applicable;
• no disguised employment relationship;
• net margin after external delivery cost.

The underestimated risk is treating subcontracting as a routine purchase. In a review, the issue is not only whether an invoice exists. The firm must show that the work was real, properly contracted and economically coherent.

French umbrella employment can be useful for a specific consultant profile or transition period. It should still be compared with direct subcontracting and employment. The decision is financial as much as legal: management fees, salary cost, insurance, payment timing and the consultant's role all matter.

See our freelance and umbrella employment service for the wider structuring angle.

French IT service providers often sell B2B services to customers in other EU countries or outside the EU. VAT treatment depends on the customer status, place of establishment, type of service and VAT number. VIES validation should be part of the billing process, not an annual clean-up.

VAT checklist:

1. Identify the customer and country.
2. Validate the VAT number through VIES.
3. Determine whether reverse charge applies.
4. Add the correct invoice wording.
5. Reconcile invoices, VAT filings and recapitulative statements where required.

Our EU VAT guide covers the main filing logic.

The French e-invoicing reform applies to VATable businesses under the national timetable. For an ESN, implementation is operational: contracts, time approvals, purchase orders, invoices, credit notes, e-reporting where relevant and collection processes must align.

• who approves billable time;
• where contracts and purchase orders are stored;
• how subcontractors submit supporting documents;
• who checks customer VAT data;
• which dashboard tracks invoices to issue and collect.

Power BI, connected to accounting data, can help monitor mission margin and cash. Regulatory preparation can be coordinated through our e-invoicing support service.

Hayot Expertise recommends structuring ESN finance around the mission. Each mission should connect a client, contract, consultant, cost, invoice, VAT treatment, payment and margin. If one link is missing, reporting becomes decorative.

The main risk is working capital. Salaries and subcontractors may be paid before clients settle invoices. Rapid growth can therefore consume cash even when the order book looks strong. A 13-week cash forecast should be a management tool, not a crisis spreadsheet.

• Validate EU VAT numbers before invoicing.
• Document every subcontracting arrangement.
• Monitor bench time and mission margin.
• Prepare e-invoicing workflows.
• Upgrade dashboards before fundraising, bank financing or acquisition talks.