The 10 critical accounting mistakes law firms make in France
The 10 critical accounting mistakes law firms make in France 2026 analysis for law firms: choices, risks, evidence to keep, watchpoints and Hayot Expertise internal resources.
Expert note: This article was written by our chartered accountancy firm. Information is current as of 2026. For a personalised review of your situation, contact us.
In a law firm, the most dangerous accounting mistake is mixing flows: fees, disbursements, CARPA, work in progress and client reimbursements.
Executive Summary#
Accounting must show what belongs to the firm, what belongs to the client and what is not yet invoiced. Without that segregation, profit and cash become misleading.
Field Diagnostic#
| Situation | Risk | Evidence or control |
|---|---|---|
| CARPA | client funds mixed | dedicated reconciliation |
| Disbursements | wrongly borne by firm | evidence and recharge |
| Unbilled time | invisible production | WIP by matter |
Documents and Evidence to Gather#
- engagement letters
- CARPA tracking
- disbursement register
- WIP
- aged receivables
Personalised Operating Method#
The review should start with CARPA, because the identified risk is clear: client funds mixed. The evidence to produce is not a general comment but a verifiable item: dedicated reconciliation. This first level prevents management from building a decision on commercial impressions or an overly aggregated accounting total.
The second point is Disbursements. Here, the risk is different: wrongly borne by firm. Management should therefore organise the file around evidence and recharge, then check that this evidence appears in accounts, cash and monthly reporting.
Finally, Unbilled time must be isolated before closing. When invisible production, management becomes fragile. The expected evidence, WIP by matter, turns a grey area into a documented decision.
Documentary Reading#
The most useful documents in this file are: engagement letters, CARPA tracking, disbursement register, WIP, aged receivables. They should not only be archived; they should be reconciled with one another. An invoice without payment, a contract without flows, an export without bank matching or a decision without minutes is not enough to secure the position.
Leadership Arbitration#
Management should mainly retain three decisions: track WIP by matter, reconcile CARPA separately, document disbursements. These decisions give the firm a concrete roadmap and keep the topic from remaining an abstract recommendation.
Sector Case Study#
A firm shows high activity but little cash. Hours are recorded, disbursements advanced and some funds move outside clear accounting. The issue is not workload; it is conversion into collected fees.
Our Chartered Accountant's View#
Hayot Expertise focuses on third-party segregation. A well-managed firm can explain every client balance and transit account.
The Underestimated Risk#
The underestimated risk is unbilled WIP that looks like wealth but pays neither salaries nor expenses.
What Leadership Must Decide#
- track WIP by matter
- reconcile CARPA separately
- document disbursements
- collect by invoice ageing
2026 Watchpoints#
- control VAT on fees
- avoid dormant third-party accounts
- formalise recharges
- prepare B2B e-invoicing
Useful Internal Links#
- 2026 BNC form 2035 guide
- account 467 and third-party balances
- corporate tax deductible expenses
- SARL tax regime in 2026
- SASU versus EURL
- accounting support
- tax and finance support
- bookkeeping and review
- 2026 law firm BNC SELARL CARPA guide
- accounting support for law firms
- Power BI dashboards for law firms
Frequently asked questions
Which accounting mistake should be corrected first in a law firm?+
Correct first the mistake that distorts a decision: unreconciled revenue, inconsistent VAT, artificial margin, forgotten WIP or misread cash.
Is a classification mistake serious?+
It can be corrected, but becomes serious when it hides a recurring flow. The real issue is monthly reconciliation between business system, bank and accounting.
How can recurring mistakes be avoided?+
Set a short close calendar, name an owner for exceptions and keep reconciliations. Control must become a routine, not a yearly operation.
Are automated tools enough?+
No. They speed up imports, but do not replace qualification of sensitive flows, suspense-account control and review of unusual cases.
Which indicator reveals fragile accounting?+
A growing suspense account, unexplained margin movement or VAT that does not follow sales are alerts to investigate quickly.
Official Sources Used#
- impots.gouv.fr - Calendrier de la reforme de la facturation electronique
- impots.gouv.fr - Formulaire 2035-SD, revenus non commerciaux
- Service-Public Entreprendre - SELARL, ce qu il faut savoir
Current as of 3 May 2026.
Article written by Samuel HAYOT
Chartered Accountant, registered with the Institute of Chartered Accountants.
Regulated French accounting and audit firm based in Paris 8, built to support companies across France with a digital and decision-oriented approach.
Sources
Official and operational sources cited for this page.
This topic is part of our service Tax accountant in Paris | CIT, VAT & tax audits
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