As a self-employed lawyer, you are subject to a specific tax regime: Bénéfices Non Commerciaux (BNC). This tax status governs the declaration of your professional income and determines your accounting and reporting obligations. Understanding the mechanisms of BNC will help you optimize your financial management and meet your legal obligations to the tax authorities.

What is the BNC for a lawyer?

The BNC is the tax category applicable to income from a liberal profession. As a lawyer, you practice a regulated profession that automatically comes under the BNC tax regime. This regime applies whether you work as an individual or within a structure such as a SELARL subject to income tax.

Unlike retailers, who are subject to the French “Bénéfices Industriels et Commerciaux” (BIC) tax, your intellectual activity and professional independence justify this special tax classification. BNC applies to all your fees, whether from consultations, pleadings or the drafting of legal documents.

The two BNC tax systems available

You have two options for declaring your professional income, depending on your annual sales.

Simplified micro-BNC scheme

The micro BNC lawyer scheme applies automatically if your annual income does not exceed 77,700 euros. This system offers remarkable administrative simplicity: you benefit from a flat-rate deduction of 34% on your revenues, intended to represent your professional expenses, with a guaranteed minimum of 305 euros. You don’t have to keep detailed accounts, just a chronological revenue book.

Please note, however, that this system is only really advantageous if your actual professional expenses are less than 34% of your income. If your actual expenses (rent, insurance, membership fees, legal documentation) exceed this percentage, you should opt for the controlled declaration system, which allows you to deduct all your expenses. This option is therefore mainly suited to junior lawyers practicing from home, those with a low-intensity complementary activity, or professionals with limited structural expenses.

The threshold of 77,700 euros can be temporarily exceeded without any immediate consequences: you are only obliged to switch to the controlled declaration system if you exceed this amount for two consecutive years. Conversely, if you voluntarily opt for the controlled declaration system, this option becomes irrevocable for a period of two years, even if your activity subsequently decreases.

The controlled declaration regime

Above the threshold of 77,700 euros, or by voluntary option, you are subject to the controlled declaration system. This system requires more rigorous accounting, but allows you to deduct all your actual business expenses: office rent, insurance, professional dues, documentation costs, social security charges, etc.

You must then complete the 2035 declaration, a specific form detailing your professional income and expenses. This declaration must be submitted before the beginning of May (generally May 3 or 4, depending on the calendar), along with the mandatory accounting appendices: fixed assets table, depreciation table and statement of provisions.

We strongly recommend that you file your tax return online via your business account on impots.gouv.fr, as this will speed up the processing of your tax return. In the event of late filing, you are liable to penalties of up to 10% of the sums due, plus late payment interest of 0.20% per month.

BNC accounting obligations

Your obligations vary according to the system you choose. Under the micro-BNC scheme, you simply keep a register of receipts, showing the date, the identity of the customer and the amount received. Under the déclaration contrôlée system, you are required to keep an income and expenditure ledger, record all your transactions in chronological order, and keep all your supporting documents for at least six years, although ten years is recommended to secure your situation in the event of an in-depth tax audit.

BNC accounting works on the principle of cash flow accounting: you record revenues when they are actually received, and expenses when they are paid. For example, fees invoiced in December 2024 but received in January 2025 will be booked and taxed in 2025, not 2024. This method differs fundamentally from the accrual accounting used for commercial companies, where the same invoice would be booked as soon as it was issued in December 2024, regardless of the date of payment.

Let’s take an example: you invoice €10,000 in fees on December 15, 2024, paid on January 10, 2025, and you pay €2,000 in expenses on December 28, 2024 for an invoice received in November. Under cash accounting (BNC), your 2024 result will show a loss of €2,000 (only the expense paid) and your 2025 result will include the €10,000 in revenue. On an accrual basis, the 2024 result would include both the €10,000 income and the €2,000 expenses, i.e. +€8,000. This distinction has a direct impact on your annual taxation and cash flow.

VAT and the BNC regime for lawyers

The question of VAT is added to your BNC regime. If your annual income remains below 37,500 euros, you benefit from the basic VAT exemption: you do not charge VAT to your customers, nor do you recover it on your purchases. A tolerance threshold exists at 39,100 euros: if you exceed 37,500 euros but remain below this amount, you retain the exemption for the current year, but will have to invoice VAT the following year.

Above the threshold of 39,100 euros, or by voluntary option, you become liable for VAT at the standard rate of 20%. The applicable system then depends on your sales: up to 840,000 euros excluding VAT, you are subject to the simplified actual system, with an annual declaration (form CA12) and two half-yearly instalments. Above this amount, you’re subject to the normal sales tax system, with monthly or quarterly declarations (form CA3), depending on your choice. You are then required to collect VAT on your fees, and can deduct the VAT incurred on your business expenses. This option can be advantageous if you make major investments.

Optimizing your BNC tax regime

There are several ways to optimize your BNC taxation. The first is to deduct your actual business expenses, such as IT equipment, legal subscriptions, travel expenses and professional contributions. You can also deduct your optional Madelin contributions within specific limits: 10% of your taxable profit capped at 8 times the annual Social Security ceiling (PASS), plus 15% of profit between 1 and 8 PASS.

An often overlooked form of optimization concerns accounting fees: you benefit from a tax reduction equal to two-thirds of the fees paid to your chartered accountant, up to a limit of 915 euros per year. This reduction is applied directly to your income tax, and represents a significant tax advantage for securing your accounting management.

Membership of an Association de Gestion Agréée (AGA) also offers significant practical advantages. Although the 25% profit surcharge for non-members has been abolished since 2023, the AGA supports you in your tax management with a personalized management file, free training on tax developments, and assistance in preventing accounting errors. This expertise strengthens your credibility with the tax authorities. Membership fees, generally between 200 and 400 euros a year, are deductible from your taxable income.

Other optimization mechanisms deserve your attention: setting aside provisions for future investments, spreading exceptional income over several years in the event of a major change in your business, or strategically choosing your financial year-end to smooth out your taxation over time.

Tax deadlines

There are several key dates in your tax calendar. The 2035 tax return and its appendices must be filed in May of each year. Your personal tax return (form 2042-C-PRO) is due between April and June, depending on your département. If you are subject to VAT, you must file monthly or quarterly returns, depending on your tax regime.

Income tax instalments are deducted monthly or quarterly on the basis of your most recent tax return. These instalments can be adjusted to reflect significant changes in your business activity. Accounting software designed for lawyers makes it much easier to meet these deadlines and prepare your tax returns.

Mastering your tax system for worry-free management

The BNC regime structures all your tax and accounting management as a lawyer. Choosing between micro-BNC and controlled declaration, managing VAT correctly, complying with your reporting obligations and optimizing your deductible expenses are the cornerstones of effective financial management. The support of a specialized chartered accountant and the use of appropriate tools will enable you to concentrate on your business while securing your tax position.