The 12 accounting mistakes that cost private doctors dearly in France in 2026

Updated 12 May 2026. A private doctor (médecin libéral) practising in Paris, whether under the non-commercial profits regime (Bénéfices Non Commerciaux, or BNC) with the actual-profits option (Article 96 of the French Tax Code, or CGI) or through a corporate-taxed SELARL, runs an accounting framework that looks deceptively simple. Gross versus net fees, retrocessions, VAT on non-therapeutic procedures, treatment of Doctolib or Maiia platforms, depreciation of medical imaging, requalification of an outsourced medical secretariat, under-claimed Madelin ceiling: each of these zones produces, at year-end or under a tax audit, a five-figure reassessment and an inflated income-tax or URSSAF social-charge bill. This article reviews the twelve mistakes we most often correct at Cabinet Hayot Expertise on files of newly installed doctors. For the general tax framework, see our analysis of the doctor's tax regime in 2026; for the VAT perimeter, read VAT and invoicing for private doctors; and for pure management indicators, consult our medical practice financial KPIs.

Cash-basis accounting on mixed flows#

A BNC doctor keeps cash-basis accounting (Article 93 CGI), unlike a trader who reasons in receivables and payables. This specificity looks like a simplification, but it complicates the reconciliation between procedures invoiced, electronic care sheets (feuilles de soins) sent via SESAM-Vitale, AMO payments from the statutory health insurance, AMC top-ups from complementary mutuals, and direct patient payments. A significant share of errors stems from the timing gap between the procedure performed and the actual collection.

Three families of errors to isolate#

Schematically, mistakes fall into three families: errors of BNC tax base (gross/net fees, ROSP, retrocessions), errors of VAT and platforms (aesthetic procedures, pro-rata, Doctolib commissions), and errors of expenses and depreciation (medical equipment, vehicle, Madelin, secretariat). This is how we structure the twelve mistakes below.

Mistake 1: confusing net and gross fees#

This is the most structuring mistake. A doctor performing a procedure billed at €60 and paying €15 of retrocession to a stand-in colleague keeps "only" €45, but the books must show both flows. Account 706 "Service revenue" records the gross fees collected (€60), while account 622 "Intermediary remuneration" or 6228 records the retrocession paid (€15). Posting €45 net directly to account 706 understates the turnover declared on Form 2035 and distorts management ratios. The reverse mistake also exists: without materialising the retrocession as an expense, the administration can recharacterise the flow and reassess the BNC base.

Mistake 2: omitting retrocessions received from a head doctor#

A locum doctor practising in the office of a head doctor receives a retrocession (typically 70 to 80% of the fees collected by the head doctor on the locum's behalf). This incoming flow must be posted to account 7068 "Fees returned" or 706 "Fees" with an explicit label, never to a current account or a neutral third-party account. Conversely, the head doctor paying the retrocession records it as an expense (622). An unmatched retrocession on either side is a classic reassessment risk on audit, since the administration cross-checks the 2035 returns of both practitioners.

Mistake 3: declaring ROSP as a simple flat top-up#

The ROSP (Rémunération sur Objectifs de Santé Publique, or pay-for-performance) paid by the CPAM (statutory health insurance fund) to the family doctor — and more recently to eligible specialists — is a full BNC income, entirely taxable and subject to PAM URSSAF social contributions. Too many doctors treat it as ancillary income or leave it on a suspense account. It must be booked to account 706 or 7081 "Operating subsidies" depending on the precise nature of the payment, and reported on line AF of Form 2035. Omission mechanically triggers an income-tax and URSSAF reassessment, cross-checked through Ameli's payment data. The family-doctor flat fee and the practice-structure flat fee follow the same logic.

Mistake 4: applying the VAT exemption to aesthetic procedures or expert reports#

Article 261-4° of the CGI exempts from VAT the care provided to persons by members of regulated medical and paramedical professions. Case law and the BOFiP doctrine (BOI-TVA-CHAMP-30-10-20-10) specify that this exemption covers only procedures with a therapeutic purpose. Consequently, the following are subject to standard 20% VAT: purely aesthetic surgery, private medico-legal expert reports, paid speaking engagements, pharmaceutical consulting and participation in clinical trials on behalf of third parties. A doctor who wrongly exempts these flows exposes themselves to a VAT reassessment over three years, with late-interest surcharges.

Mistake 5: forgetting the VAT pro-rata for mixed activity#

When a doctor combines exempt care activity and taxable activity (aesthetic, expert reports), they become a partial VAT payer and must apply the coefficient of taxable activity and deduction set out in Article 271 CGI. The basic exemption of Article 293 B (€37,500 threshold in 2026 for services other than lawyers) may neutralise the obligation to charge VAT, but it does not eliminate the loss of input-VAT recovery. Above the threshold, a partially taxable doctor can only recover VAT on purchases up to the pro-rata of taxable activity. Ignoring this mechanism leads either to over-deduction (reassessment) or under-deduction (net loss).

Mistake 6: posting Doctolib or Maiia commissions as net fees#

A platform commission for online appointment booking (Doctolib, Maiia, Keldoc) is an operating expense. It belongs in account 622 or 6228, never as a direct deduction from account 706. For a partially taxable doctor or a SELARL above the VAT threshold, the VAT charged on the platform invoice is in principle deductible up to the coefficient of taxable activity (Article 271 CGI). For a fully exempt BNC doctor, the VAT on the Doctolib commission remains a final cost. Booking the commission net artificially compresses the turnover and distorts the declared profit.

Mistake 7: not reconciling third-payer flows line by line#

Third-payer flows from AMO (mandatory health insurance) and AMC (complementary mutuals) generate numerous statements, sometimes fragmented and received over several days. The absence of line-by-line reconciliation between the list of procedures sent via SESAM-Vitale and the wire transfers actually credited to the professional account produces two types of errors: undetected double collections (the patient also pays by cheque while the procedure is third-payer covered) and lost receivables (a rejected procedure not reprocessed in time). On a full year of practice, the unreconciled gap frequently reaches 2 to 5% of gross fees.

Mistake 8: outsourcing secretariat in disguised-employment conditions#

An outsourced medical secretariat legally becomes disguised salaried employment when three criteria converge: an effective subordination link (imposed schedule, precise instructions), de facto exclusivity, provision of equipment and premises by the practice. Upon a URSSAF audit, requalification is retroactive over five years (social statute of limitations), with reassessment of employer and employee contributions, surcharges and interest. The outsourced secretariat must therefore: have other clients, use its own technical resources, invoice on a fixed-fee or volume basis, and sign a service contract without an exclusivity clause.

Mistake 9: under-claiming the Madelin ceiling#

The Madelin contract (Madelin individual pension plan or its successor scheme) opens a higher deductibility ceiling than the standard PERin: 10% of the taxable profit within the limit of 8 PASS (annual social-security ceiling), augmented by 15% of the profit between 1 and 8 PASS. For a doctor reporting €110,000 of profit, the combined ceiling frequently exceeds €30,000, where a simple PERin would cap at around 10% of 8 PASS. Many doctors stop at the "10%" fraction and never activate the additional "15%" fraction, leaving €5,000 to €15,000 of income-tax deduction on the table every year.

Mistake 10: combining the mileage scale and actual vehicle expenses#

A BNC doctor using their personal car for home visits can choose, on a yearly and exclusive basis, either the mileage scale published annually by the tax administration (a simple option based on fiscal horsepower and professional kilometres), or actual expenses (fuel, maintenance, insurance, depreciation, loan interest if the vehicle is registered as a professional asset). Combining both regimes within the same exercise is prohibited by the BOFiP doctrine (BOI-BNC-BASE-40-60). The classic mistake consists in deducting some maintenance as an actual expense while applying the mileage scale: regularisation is systematic at audit.

Mistake 11: depreciating medical equipment over a non-sector duration#

Medical equipment follows differentiated depreciation periods in professional practice: an ultrasound machine depreciates over 5 to 7 years, an MRI or scanner over 8 to 10 years, office furniture over 10 years, IT hardware over 3 years, business software over 1 to 3 years. The fixed-asset register required by Article 99 CGI must reflect these durations, justifiable by usage and by reference to professional scales. Applying a duration that is too short (over-depreciation) or too long (under-depreciation) exposes the doctor to a reassessment, with the administration recomputing the correct annuity and adjusting the difference on open exercises.

Mistake 12: staying under micro-BNC when expenses exceed 34%#

The micro-BNC regime applies a flat allowance of 34% on gross receipts (Article 102 ter CGI), capped at the €83,600 threshold for 2026. For a doctor whose actual expenses (office rent, secretariat, professional insurance, CARMF and URSSAF PAM contributions, depreciation, Madelin, vehicle expenses) represent 45 to 60% of receipts, this regime mechanically leaves 10 to 25 percentage points of margin taxable that should not be. Switching to the actual-profits regime (Article 96 CGI), with a cash receipts-and-expenses ledger and a fixed-asset register, becomes largely beneficial. For a doctor at €90,000 in receipts and 50% in actual expenses, the extra income-tax plus PAM contributions cost of staying on micro routinely reaches €4,000 to €7,000 a year.

A structured annual review based on the 12 mistakes#

At Cabinet Hayot Expertise in Paris, we systematically apply a twelve-point grid covering the mistakes above to every private doctor's year-end. The review starts with a reconciliation between procedures sent via SESAM-Vitale and bank collections (mistakes 1, 2, 7), continues with the tax classification of non-therapeutic flows (mistakes 3, 4, 5, 6), and concludes with an audit of expenses and depreciation (mistakes 8 to 11), with a BNC regime arbitrage at closing (mistake 12). This method neutralises 80% of the reassessment risk observed in audits in the liberal-profession sphere.

An engagement that starts before installation#

The earlier the doctor consults us — ideally before installation, at the point of choosing between own-name BNC and SELARL — the more we avoid retroactive corrections on early exercises. To frame your installation or fix an already-open file, contact our Paris 8 accounting and audit services team; for growing structures (group practice, multi-partner SEL, patrimonial holding above), our outsourced CFO offering takes over. To understand the general logic of an accounting period, see also our introduction to accounting principles and our analysis of the accounting period. On available funding and exemptions, read grants and exemptions for private doctors.