Choosing the right collective agreement (IDCC): payroll impact

Quick answer. The applicable collective agreement depends on the main activity actually carried out (Article L2261-2 of the Labour Code), not on the activity code assigned by Insee. It is identified by its IDCC code, searched on the official labour-law database or Légifrance. It sets minimum wages at least equal to the legal minimum wage (€1,867.02 gross monthly on 1 June 2026), classifications and sometimes bonuses, and must appear on the payslip (Article R3243-1). A wrong agreement leads to back pay.

In social audits, it is not rare to find a company applying an unsuitable agreement for years: confusion between activity code and IDCC, a contract template reused without checking, an undocumented change of activity. The payroll consequences are immediate: false minimum wages, wrong classifications, forgotten bonuses, and a risk of back pay in an audit.

This article describes the method to identify the applicable agreement and apply it in payroll. It complements, without repeating, the article on the fundamentals of the collective agreement, focused on the definition and general obligations: here the angle is operational — how to find YOUR agreement and apply it to the payslip.

Two identifiers, two logics.

The activity code has no legal value for determining the agreement: you can have a correct code and apply, by mistake, the wrong agreement. It is the main activity actually carried out that governs (Article L2261-2).

1. Precisely describe your main activity (the one generating most revenue).
2. Search the agreement on the official labour-law database (dedicated tool) or on Légifrance (IDCC list).
3. Note the 4-digit IDCC code and open the text of the agreement.
4. In case of doubt, confirm with your industry association or your accountant.

A few verified references to anchor ideas: quick-service restaurants IDCC 1501 (brochure 3245), hotels-cafés-restaurants IDCC 1979 (brochure 3292), accounting and audit firms IDCC 0787 (brochure 3020). For the latter, see the detail in our article on the accounting firms' agreement.

Before settling on an IDCC, read the agreement's "scope" article:

• targeted business sector;
• geographic area (national, regional);
• staff categories covered;
• any exclusions.

An agreement whose scope does not cover your real activity does not apply, even if the title seems close. With multiple activities, the main activity's agreement applies to all, save documented special cases.

The agreement affects several payslip lines.

The salary grid by classification is specific to each branch and revised by amendment. Consult the grid in force for YOUR agreement: do not rely on a generic amount. As an illustration — subject to your branch's actual grid: if your agreement sets a minimum of €1,950 gross for a given coefficient, applying the legal minimum (€1,867.02) instead would create a gap of about €83 per month, i.e. nearly €1,000 per year per employee, recoverable over three years (back-pay limitation, Article L3245-1). The financial stake of a wrong agreement is therefore concrete.

The payslip must show the title of the applicable branch collective agreement (Article R3243-1 of the Labour Code). In practice, include the recognisable title and, ideally, the IDCC code. This mention must be accurate and present on every payslip; it is also carried in the DSN. For software setup, see how to configure the agreement in Silae.

Multiple activities. The main activity's agreement applies to all employees; segmentation by function remains possible when distinct establishments fall under different activities, to be documented.

No branch agreement. Some activities fall under no branch agreement. The employer then applies the Labour Code (minimum wage, legal hours, legal leave) and may conclude a company agreement.

Change of agreement. Justify the change by a real change of activity, inform staff representatives if any, notify employees in writing and apply the new agreement going forward. An unfavourable change poorly framed exposes you to disputes.

1. Main vs secondary activity: the dominant revenue sets the IDCC; audit it periodically.
2. Amendments: a minimum revised by amendment applies from its entry into force; track updates.
3. Agreement imposed by the contract: a named mention in the employment contract binds the employer; prefer wording referring to "the agreement applicable according to the activity carried out".
4. Payslip mention: a missing or wrong agreement is an irregularity.

In a recent audit of a restaurant chain, three establishments rightly fell under quick-service restaurants (IDCC 1501), while a fourth, mainly table service, fell rather under hotels-cafés-restaurants (IDCC 1979): the director had copied a template contract without checking the scope. We harmonised the files based on each establishment's real activity, securing payroll and the DSN.

Correctly identifying the IDCC is not a one-off decision but ongoing monitoring: activity evolves, amendments come. As a chartered accountant registered with the French Ordre des experts-comptables, I recommend an annual review of the agreement applied and its minimum-wage grid — one of the best safety-to-time controls in payroll.

Hayot Expertise advice. Check your IDCC when drafting the first contract, then every year. Keep proof of your search (text of the agreement, date) and the minimum-wage grid in force. If in doubt between two agreements, decide on the main activity and document your choice: it is your best defence in an audit.