Construction accountant in France: 2026 guide

Construction accountant in France: 2026 guide#

Construction accounting in France must follow the site, not only the invoice. Progress billing, reverse-charge VAT, subcontractors, retention money, payroll, material purchases and payment delays can create a very different picture from the annual profit and loss statement.

This guide is for building contractors, construction SMEs, specialist trades, engineering offices and project managers. It connects with our French pages for BTP and construction accounting and outsourced CFO support.

The key accounting risks are VAT, contracts, site margin and cash. A construction company may be profitable on paper while cash is trapped in payment delays, retention money or poorly controlled subcontracting.

French tax rules provide a reverse-charge mechanism for certain construction works performed through subcontracting. When applicable, the subcontractor invoices without VAT and the customer accounts for VAT under the reverse-charge mechanism. The mechanism should never be applied automatically. The contract, the role of each party and the nature of the work must be checked first.

For relevant private works contracts, French law allows retention money up to 5% of progress payments to secure completion and reservations at reception. Accounting should track it as a receivable, not as a discount.

Example: if a progress invoice is 80,000 euros excluding VAT and the contract includes 5% retention, 4,000 euros is not collected immediately. Across several sites, this can materially reduce cash even when revenue has been booked.

Before paying a subcontractor, the company should keep a clear contract, description of works, price, payment milestones, insurance evidence, relevant certificates and VAT treatment.

Site margin should compare budget, committed purchases, internal hours, subcontracting, billed progress and remaining work. Global company margin is not enough because one late or badly priced site can absorb the profit of several good projects.

In construction, the economic reality is more gradual than a standard sale. A project moves through a quote, a service order, a deposit, progress statements, retention, subcontracting, reception, reservations and a final balance. Accounting therefore has to separate four different things at any moment: what has been invoiced, what has actually been produced on site, what has been collected, and what still remains to be done. Confusing these is the single most common source of trouble, because a deposit invoice never proves that a site is profitable.

This is why progress statements deserve careful handling. A progress invoice reflects how much of the works has advanced, and it must be issued at the right rhythm: too slow, and the company finances the client; too fast, and the statement no longer matches the real state of the site, which creates disputes and credit notes later. Each statement should be tied to a specific project so that revenue, deposits, revisions and retention can all be traced back to the same site.

A manager running building works should monitor several moving parts in parallel: the margin on each site, purchases allocated to each project, the cost of internal teams and of subcontractors, retention money and financial guarantees, customer advances and supplier deposits, and any disputes, reservations or penalties. None of these appear cleanly in a single global figure, which is why site-level tracking matters more than the company-wide profit and loss statement. One late or badly priced site can absorb the profit of several good ones.

A reporting dashboard built with a tool such as Power BI can help a construction SME compare its sites, but only when the underlying purchase, time and billing data are clean. The dashboard is only as reliable as the allocation of costs to projects beneath it.

A construction business can be profitable on paper and still run short of cash on the ground. The reason is timing. Material purchases and crew payroll are paid early, while collection arrives late, slowed further by deposits, customer payment terms and retention money held back at reception. The job of the accounting function is to anticipate this site-by-site cash need rather than discover it after the fact.

Payroll adds its own weight to the equation. Teams have to be paid throughout the works, regardless of when the client settles a progress statement, and the cost of internal hours is a real production cost that should be allocated to the relevant site rather than left in a general overhead bucket. When labour is poorly tracked, the margin at completion drifts away from the quoted margin without anyone noticing in time.

Subcontracting is the area where prevention pays off most. The contract should be secured before the first invoice, not reconstructed afterwards. A minimum file should bring together a clear contract or purchase order, a description of the works, the price, milestones and payment terms, the social and tax certificates where they are required, suitable professional insurance, a validated VAT treatment, and an agreed approach to reservations and penalties. Assembling these documents up front reduces both the tax risk and the social risk that an incomplete subcontractor file can create.

A practical discipline ties all of this together: before each monthly close, review the sites with no recent invoice, supplier invoices not yet allocated to a project, old retention amounts still outstanding, customers in arrears, subcontractors without a complete file, and committed purchases with no remaining budget. This monthly check is what keeps the gap between theoretical margin and margin at completion under control, and what stops retention money from quietly disappearing from the cash forecast. Our advice is to treat reverse-charge VAT, retention and the subcontractor file as items to verify before an invoice goes out, never as something to correct six months later.

French e-invoicing requires all businesses to receive e-invoices from 1 September 2026. Construction companies must pay particular attention to progress invoices, purchase orders, deposits, retention money and reverse-charge wording. See our e-invoicing guide.

In construction, the underestimated risk is the gap between the quoted margin and the margin at completion. A site may be profitable on paper and lose margin through unallocated purchases, poorly tracked labour, penalties, rework, late billing or retention money forgotten in the cash forecast.

• BOFiP: reverse-charge VAT for construction subcontracting.
• Légifrance: retention money rules for works contracts.
• economie.gouv.fr: e-invoicing timetable.
• impots.gouv.fr: VAT regimes.