Declaration 2035 BNC 2026: Complete Guide for Liberal Professions in Real Regime

Every spring, thousands of self-employed professionals must file their professional tax return using form 2035-SD (accompanied by annexes 2035-A and 2035-B). Unlike the micro-BNC regime, where the administration automatically applies a flat-rate reduction of 34% on revenue, the controlled declaration regime requires declaring all revenue collected and actual expenses incurred during the financial year.

This regime is often feared by professionals who discover it for the first time, because it involves more rigorous accounting. However, when it is well managed, it allows considerable tax savings, in particular for practitioners whose actual expenses far exceed 34% of fees (SSI contributions, office rent, staff, Madelin contracts, etc.).

This practical and exhaustive guide explains to you: who must be subject to the 2035 in 2026, how the form is structured, which expenses are deductible (and which are not), how to calculate your taxable profit, what are the deadlines to respect, and how to avoid the most frequent errors. We illustrate everything with a concrete numerical example and propose legal tax optimization avenues.

Professionals under controlled declaration regime#

The controlled declaration system applies to all holders of Non-Commercial Profits (BNC) whose annual revenue excluding taxes exceeds the micro-BNC threshold. For 2025 income declared in 2026, this threshold is set at €77,700 excluding tax (or €83,600 for mixed activities). Beyond this amount, the transition to controlled declaration is automatic and mandatory.

But crossing the threshold is not the only entry point. Professionals whose income remains below the ceiling can also voluntarily opt for this regime if they estimate that their actual expenses exceed 34% of their fees. This is often the case when a professional pays significant SSI contributions, rents an office, employs a secretary or collaborator, or subscribes to Madelin contracts.

The professions concerned are numerous and varied:

• Health professions: doctors (sector 1, 2 or 3), dentists, physiotherapists, speech therapists, psychologists, private nurses, midwives, osteopaths, etc.
• Legal professions: lawyers, notaries (for their BNC share), bailiffs, legal representatives
• Figure professions: independent accountants, auditors, tax advisors
• Technical and creative professions: architects, surveyors, consulting engineers, independent designers
• Consulting and training professions: consultants, independent trainers, professional coaches, translators, editors

Not concerned: micro-entrepreneurs remaining below the micro-BNC threshold, who only complete the dedicated box of their personal declaration (form 2042-C-PRO).

Partnerships (SCP, SEL at IR, SNC)#

Certain corporate structures also fall under the 2035 declaration:

• Professional Civil Companies (SCP) file a 2035 in the name of the company. Each partner then reports their share of profit or deficit in their own personal declaration (2042).
• Liberal Practice Companies (SEL) subject to income tax (optionally or automatically for SELURLs for example) obey the same rules.
• Societies in Collective Name (SNC) with IR whose activity falls under the BNC are also concerned.

First year of activity: when to opt for the controlled declaration?#

For a professional starting his activity, the micro-BNC regime automatically applies if the first year's revenue remains below the threshold. The option for the controlled declaration must be exercised before February 1 of the year following the start of activity to apply retroactively to the start-up year.

For example, a doctor who sets up as a freelancer in March 2025 can opt for the controlled declaration for the 2025 financial year by sending his request to the tax center before February 1, 2026. Once the option is exercised, it is valid for a minimum period of two years and is renewed by tacit agreement. It can be denounced before February 1 of the year following the two-year period.

General structure#

Form 2035-SD is the central BNC tax package. It consists of several distinct frameworks:

• Identification page: SIRET, nature of the activity, address of the firm, tax regime (controlled declaration), contact details of the accountant if applicable
• Frame A — Professional revenue: total receipts for the financial year
• Frame B — Professional expenses: total deductible expenses
• Frame C — Tax result: calculation of profit or deficit (A − B − depreciation)
• Annex 2035-A: detail of revenue by type and current expenditure
• Appendix 2035-B: fixed assets, depreciation, capital gains and losses, miscellaneous information

Revenue to be declared (Box A)#

The BNC regime is based on cash accounting (revenue-expenditure) and not on accrual accounting. Concretely, you only declare fees and other revenue actually collected between January 1 and December 31, 2025, regardless of the billing date.

Recipes to include include:

• Fees collected: consultations, procedures, intellectual services
• Retrocessions received: if you have subcontracted work to colleagues who transfer back to you
• Refunds of re-invoiced expenses: if you re-invoice disbursements to your clients
• Ancillary income: conferences, publications, paid university teaching, legal expertise, etc.
• Subsidies and compensation: CPAM, remuneration paid by third-party organizations as part of the activity

VAT treatment: if your activity is subject to VAT (rare for doctors, common for lawyers or consultants), you declare the revenue excluding tax (HT). If you are exempt from VAT (doctors, regulated health professions), you declare the amount all taxes included (TTC), which is also the net amount collected.

This is where most of the interest in the real regime for busy liberal professionals lies. Each euro of deductible expense directly reduces the taxable base, and therefore the income tax to be paid.

Rent and rental charges for the office#

The rent of the professional premises is fully deductible if the premises are used exclusively for professional purposes. If you work from your personal home, the deduction is possible but calculated on a pro rata basis:

• Prorata surface area: surface area dedicated to the office / total surface area of the accommodation
• Prorated time: if the room is used for mixed purposes, an additional reduction applies

Concrete example: you have a 100 m² apartment of which a 25 m² room is dedicated exclusively to your office. You can deduct 25% of the rent, electricity, internet subscription, and other co-ownership charges. If the room is also used for personal purposes in the evenings and weekends, a second pro rata for professional use over time must be applied.

Deductible rental charges include: rent, co-ownership charges, property tax if you are the owner and register the property as an asset, electricity, water, internet and telephone subscription (professional portion), professional multi-risk insurance.

Personnel costs and subcontracting#

• Salaries and employer social security contributions of employees (secretary, assistant, employed nurse): fully deductible
• Retrocessions of fees paid to colleagues or replacements: deductible as subcontracting expenses
• DAS2 obligation: if you pay more than €1,200 in the year to the same beneficiary (colleague, service provider), you must declare these amounts via the DAS2 declaration (no. 2561), sent to the tax administration. The absence of DAS2 may result in the reinstatement of the charges concerned.

Social contributions and Madelin contracts#

This position is often the most important for liberal professions:

• Mandatory SSI contributions (Social Security for the Self-Employed): sickness-maternity contribution, basic pension, supplementary pension, disability-death, family allowances — fully deductible
• Deductible CSG: out of the total CSG of 9.2%, the fraction of 6.8% is deductible from professional income (the remaining 2.4% is not deductible from 2035, but can be deducted from overall income under certain conditions)
• CRDS (0.5%): non-deductible under any circumstances
• Madelin contributions (supplementary health, welfare, supplementary retirement): deductible within legal limits. For the Madelin pension for example, the deduction ceiling in 2026 is the higher of 10% of taxable profit or 10% of 1 PASS (i.e. approximately €4,638), within the limit of 10% of 8 PASS.

It is strongly recommended to check these ceilings precisely with your accountant before the end of the financial year, because Madelin payments excessive in relation to the ceilings are not deductible.

Travel expenses#

Business travel is deductible using two methods:

1. Tax mileage scale (if the vehicle remains in personal assets): you multiply the number of professional kilometers traveled by the coefficient of the tax scale published annually. This 2026 scale takes into account the fiscal power of the vehicle and includes fuel, maintenance and depreciation costs. Electric vehicles benefit from a 20% increase in the scale.

2. Actual costs (if the vehicle is registered as a professional asset): deduction of fuel, maintenance, insurance, repairs and depreciation of the vehicle.

Please note: the journey between home and office is not deductible for self-employed professionals in BNC, unlike employees who can deduct their transport costs. Only travel from one workplace to another (home visits, consultations in establishments, trips to clients) are permitted. Strictly professional public transport costs, train or plane tickets for business trips, as well as hotel and meal costs while traveling are also deductible (actual costs justified).

Equipment, furniture and depreciation#

• Small equipment and tools < €500 excluding VAT: deductible immediately and in full in the year of purchase
• Equipment > €500 excluding VAT: must be depreciated over their normal useful life:
  • IT equipment (computer, printer): 3 years
  • Office furniture: 5 to 10 years
  • Medical-technical equipment: depending on nature (2 to 10 years)
  • Vehicle registered as an asset: 4 to 5 years (with deduction limit)
• Software: deductible immediately or amortized over 3 years depending on your choice (both methods are accepted)
• Fitting work of the office: depreciable over the duration of the lease or 10 years

Depreciation is detailed in Annex 2035-B (table of fixed assets).

Training, documentation and professional contributions#

• Professional training costs (symposia, CPD, continuing training): fully deductible
• Subscriptions and documentation: specialized journals, professional databases, technical books: deductible
• Ordinal contributions: contribution to the Council of the Order (Order of Physicians, Bar, Order of Architects, etc.): deductible
• Professional union contributions: deductible on the 2035 (unlike employee unions which give the right to a tax reduction)
• Contribution to an approved management association (AGA): deductible - and remember that members of an AGA benefit from a non-increase of 25% on their BNC profit, a major advantage

Bank fees and loan interest#

• Professional account maintenance fees: fees, commissions, transfer fees: deductible
• Interest on professional loans: if you have taken out a loan to finance your practice (purchase of equipment, fitting out of premises, customer acquisition), the interest is fully deductible
• Professional insurance premiums (professional civil liability, office insurance): deductible

Non-deductible expenses (not to be included in 2035)#

Certain expenses, even paid from the professional account, are never deductible:

• Fines and tax penalties (article 39-2 of the CGI)
• Income tax itself
• CRDS (contribution to the repayment of social debt)
• Personal expenses (family meals, vacations, clothing not related to work)
• Personal retirement savings contributions beyond the Madelin ceilings
• Interest on a personal loan (main residence real estate loan in particular)

Basic formula#

The taxable BNC profit is calculated as follows:

Profit = Total Revenue − Total Deductible Expenses − Depreciation Allowances ± Capital Gains/Moins-values

Professional capital gains and losses: when selling a professional asset registered as an asset, the capital gain or loss generated is treated according to the holding period:

• Less than 2 years → short term: included in ordinary profit
• More than 2 years → long term: taxed at the rate of 12.8% (+ social security contributions), unless exempt (article 151 septies of the CGI for small businesses)

Carry-forward deficit#

When professional expenses exceed revenue for the year, the BNC deficit can be:

1. Imputed on the overall income of the tax household in the same year (article 156 of the CGI), which can erase other household taxes
2. If the overall income is insufficient, the deficit balance is carryable to BNC profits for the following 6 years

This is a significant advantage during the first years of installation or periods of intense investment.

Complete numerical example: Dr. Martin, private doctor sector 2#

Let's take the example of Dr. Martin, a specialist doctor in sector 2, practicing in an individual practice in Paris. Here is its situation for the 2025 financial year:

Comparison with micro-BNC:

• In micro-BNC: reduction 34% → taxable base = 180,000 × 66% = €118,800
• In controlled declaration: tax base = €84,500
• Basic taxable savings: €34,300
• At 41% TMI: tax saving = 34,300 × 41% ≈ €14,063

The real regime here represents an annual tax advantage of more than €14,000, not counting the saving on social security contributions on earned income.

Declarative calendar 2026#

The filing of the 2035 declaration has been mandatory electronic since 2020 for all professionals (except exceptional exemption for white areas). Two methods exist:

• EDI (Electronic Data Interchange): your accountant transmits the package via its approved professional software. Additional time often granted until May 20, 2026 according to EDI conventions.
• EFI (Computerized Forms Exchange): you submit it yourself via your professional space on impots.gouv.fr. Common law deadline: second working day following May 1, 2026, i.e. May 5, 2026.

Important: the 2035 must always be filed before or simultaneously with your personal income tax return (form 2042), since the profit calculated in the 2035 is carried over to the 2042.

Payment terms#

The BNC profit is subject to:

• Income tax (progressive scale)
• social security contributions on earned income (17.2% including CSG/CRDS)
• SSI contributions (calculated a posteriori on the actual benefit of N-2, with regularization)

The system of provisional payments (monthly payments or third-party installments) allows payments to be staggered. For fiscal year 2025:

• Advance payments were made during 2025 based on 2023 profit
• The income tax balance calculated after filing the 2042 is due on September 15, 2026
• Regularizations of SSI contributions follow the SSI calendar (final appeal received in 2026)

Here are the most common errors, which can lead to tax adjustments or optimization losses:

1. Confuse accrued rights and collections: BNC is cash accounting. An invoice issued on December 28, 2025 and collected on January 5, 2026 must be declared in 2026, not in 2025.

2. Omit retrocessions of fees paid: if you have used a replacement or subcontracted to a colleague, these amounts reduce your taxable income — they must not be omitted.

3. Do not distinguish between deductible and non-deductible expenses: including the CRDS or a tax fine in the expenses is an error corrected during inspection.

4. Forget depreciation on goods > €500 excluding VAT purchased during the year: a computer costing €1,200 is not fully deductible in the year of purchase, it must be depreciated.

5. Include personal charges paid from the professional account (streaming subscriptions, food shopping, etc.).

6. Do not declare incidental income: paid conferences, expert opinions, publications — these BNC income must all appear in the bundle.

7. Omit DAS2 for retrocessions or fees paid > €1,200/an: the administration can reinstate the corresponding charges.

8. Confuse deductible CSG and non-deductible CSG: only the 6.8% fraction is deductible on the 2035. The non-deductible fraction (2.4%) is treated differently on the 2042.

9. Exceeding the Madelin ceilings without prior verification: excess contributions are not deductible and increase the result.

10. Late deposit: late payment penalties (10% increased) and late payment interest (0.20% per month) can be combined. In the event of a total absence of deposit, the administration may tax automatically.

Within the legal framework, several levers make it possible to reduce the taxable BNC profit:

• Anticipate equipment purchases before December 31: equipment < €500 purchased on December 30 is fully deductible for the current financial year. Beyond that, depreciation begins in the year of acquisition.
• Maximize Madelin contributions in December: Madelin contributions paid before 31/12 are deductible over the financial year. Catch-up on contributions at the end of the year is very tax efficient.
• Check the Madelin retirement ceiling: depending on your forecast profit, precisely calculate the deductibility ceiling to avoid surpluses and maximize the envelope.
• Join an Approved Management Association (AGA): membership in an AGA avoids the 25% increase in BNC profit (applicable to non-members). The cost of the AGA contribution (around €200-400/an) is largely amortized by the tax savings.
• Use decreasing depreciation on certain eligible equipment (industrial equipment, IT) to accelerate the deduction.
• Consider setting up a SELARL if the recurring BNC profit exceeds €100,000 to €120,000: at this level, corporate tax (IS) combined with optimized remuneration can be more advantageous than IR on the entire profit. This decision requires a complete heritage analysis.

The 2035 declaration is technically accessible, but it has significant pitfalls that can be costly. It is particularly advisable to rely on an accountant:

• The first year in controlled declaration: to implement cash accounting, identify all deductible expenses and correctly structure the package
• As soon as revenue exceeds €100,000: the tax issues become significant, a declaration error can cost several thousand euros
• In the event of creation or restructuring: transition to SELARL, SELAS, SCP, association between colleagues — the tax and social implications are complex
• If the activity is mixed: BNC + salary income, BNC + property income, partial activity abroad — interactions between tax regimes require specific expertise
• To optimize Madelin/remuneration/depreciation arbitrations at the end of the financial year
• In the event of a tax audit: the presence of an accountant is essential to defend the positions adopted and respond to requests from the administration