Voluntarily Applying a Collective Bargaining Agreement in France: What Employers Must Know

Applying a collective bargaining agreement (convention collective) does not always stem from a legal obligation tied to the company’s main activity. In many situations, an employer deliberately chooses to apply an agreement that does not normally apply to it. This seemingly harmless choice carries considerable legal consequences that every executive must fully understand before committing.

DAIRIA Avocats breaks down the mechanisms of voluntary application, its forms, its effects, and the options for reversing course.

What Is the Voluntary Application of a Collective Bargaining Agreement?

The voluntary application of a collective bargaining agreement refers to a situation in which an employer decides, without being legally bound to do so, to subject its company to the provisions of a given collective agreement. This approach differs from mandatory application, which arises either from membership in a signatory employers’ organization or from a ministerial extension order (arrêté d’extension) (Article L.2261-2 of the French Labour Code).

In practice, voluntary application may result from several situations:

• The employer wishes to provide a contractual framework for its employees where no extended agreement covers its sector of activity
• The employer prefers to apply a more favourable agreement than the one normally applicable
• The employer mistakenly applies a different agreement in good faith
• The employer takes over a company whose employees benefited from a different agreement

Whatever the initial motivation, the legal effects are identical once voluntary application is established.

The Forms of Voluntary Application

The Reference on Payslips

The most common form of voluntary application arises from the mention of a collective bargaining agreement on employees’ payslips. In accordance with Article R.3243-1 of the French Labour Code, the payslip must state the title of the applicable collective agreement. Where the employer enters an agreement that is not legally imposed on it, this reference constitutes an undertaking to apply that agreement.

The French Supreme Court (Cour de cassation) has consistently laid down this principle: “the mention of a collective bargaining agreement on the payslip amounts to recognition that the agreement applies to the company” (Cass. soc., 18 November 1998, no. 96-42.991). This case law has been confirmed on numerous occasions (Cass. soc., 15 November 2007, no. 06-44.008).

It is important to stress that this reference creates a rebuttable presumption (présomption simple): the employer may provide contrary evidence by showing that it was a clerical error, but in practice such evidence is very difficult to produce where the reference has appeared on payslips for a significant period.

The Reference in Employment Contracts

Including a reference to a collective agreement in employment contracts constitutes an even stronger undertaking. Since the employment contract is the law of the parties, mentioning a collective agreement in this document creates a contractual right in favour of the employee. The Cour de cassation holds that “the reference to a collective bargaining agreement in the employment contract constitutes a contractual clause” (Cass. soc., 13 March 2001, no. 99-45.651).

The consequence is major: unlike a unilateral undertaking or a custom (usage), a contractual clause cannot be amended or removed without the individual consent of each affected employee. The employer therefore cannot unilaterally withdraw from this commitment.

The Employer’s Unilateral Undertaking

Voluntary application may also result from a formal unilateral undertaking by the employer, for example through a service memo, internal regulations, or a decision posted within the company. This unilateral undertaking binds the employer for as long as it has not been duly terminated in accordance with the procedure applicable to unilateral undertakings.

The Company Custom (Usage)

Finally, the repeated, consistent, and general application of a collective agreement may amount to a company custom (usage d’entreprise). For a custom to be recognized, three cumulative conditions must be met: generality (application to all staff or to an objective category), consistency (regular and non-random application), and fixity (determined and stable criteria for application).

The Legal Consequences of Voluntary Application

The Obligation to Apply the Agreement in Full

One of the most debated questions in case law concerns the scope of the undertaking: must an employer who voluntarily applies a collective agreement apply it in full, or may it limit itself to certain provisions?

The Cour de cassation’s answer is nuanced. In principle, “an employer who decides to voluntarily apply a collective bargaining agreement is bound to apply all of its provisions” (Cass. soc., 10 February 1999, no. 96-44.337). This principle rests on the idea that the collective agreement forms an indivisible whole—an overall balance between rights and obligations.

However, case law allows for qualifications. Where the employer’s undertaking expressly concerns only certain provisions—for example a salary scale or a supplementary insurance scheme (régime de prévoyance)—the courts may limit the obligation to those provisions alone. The Cour de cassation has thus held that “where the employer’s undertaking concerns only certain benefits of the collective agreement, employees cannot claim the benefit of the other provisions” (Cass. soc., 19 November 2008, no. 07-40.749).

In practice, the distinction between full and partial application depends on the wording of the undertaking. A generic reference such as “National Collective Bargaining Agreement for the Metalworking Industry” on the payslip results in full application, whereas a contractual clause stating “the provisions of CBA X relating to leave are applicable” may limit the undertaking.

Interaction with the Mandatorily Applicable Agreement

Where the company is already subject to a mandatory collective agreement (by extension or employer membership), the voluntary application of another agreement creates a situation of overlap. In accordance with Article L.2254-1 of the French Labour Code, the employee may rely on the more favourable provisions of each of the two agreements, under the more-favourable principle (principe de faveur).

This overlap can prove extremely costly for the employer. The comparison is carried out benefit by benefit, within each homogeneous category of provisions, in accordance with settled case law (Cass. soc., 17 July 2001, no. 99-41.917). The employer then becomes bound to apply the more favourable regime drawn from two separate agreements.

Effects on Current and Future Employees

Voluntary application benefits all employees present in the company at the time of the undertaking, as well as employees hired subsequently, for as long as the undertaking has not been validly terminated. No seniority or occupational category condition may be raised against them, unless the initial undertaking was itself limited to a specific category.

Terminating Voluntary Application

Termination as a Custom

Where voluntary application results from a company custom or a unilateral undertaking, the employer may end it by complying with the custom-termination procedure established by case law. This procedure requires three cumulative conditions:

1. Informing employee representatives: the Social and Economic Committee (comité social et économique, or CSE) must be informed of the employer’s decision to terminate the custom. This information must be sufficiently precise to allow for an informed discussion.
2. Informing employees individually: each affected employee must be personally informed, preferably in writing, of the termination of the custom. A simple posting is not sufficient.
3. Complying with a sufficient notice period: the employer must allow a reasonable period between the announcement of the termination and its actual effective date. This period, assessed at the sole discretion of the trial judges, must allow for possible substitution negotiations. In practice, a period of three months is generally considered sufficient.

The Cour de cassation reiterated these requirements in a leading judgment: “the employer may only remove a custom after complying with the termination procedure, which requires informing employee representatives and each affected employee” (Cass. soc., 16 March 1989, no. 85-45.934).

The Impossibility of Terminating a Contractual Benefit

By contrast, where voluntary application results from a clause in the employment contract, unilateral termination is impossible. The employer must obtain the express consent of each employee to amend or remove the contractual reference to the agreement. The employee’s refusal does not constitute misconduct and cannot justify a dismissal (Cass. soc., 14 May 1998, no. 96-43.767).

An employer who nevertheless wishes to remove the benefit may consider a redundancy dismissal (licenciement pour motif économique) if the removal is justified by genuine economic difficulties, but it will have to comply with the full redundancy procedure and pay the corresponding indemnities.

The Effects of Termination

Proper termination of voluntary application ends the employer’s obligations for the future. Employees can no longer claim the benefit of the agreement’s provisions as from the effective date of termination. However, rights accrued before termination remain vested: wages due, accrued leave, and indemnities calculated on the basis of the terminated agreement for the prior period.

It is important to note that the termination of voluntary application does not follow the regime for terminating a collective agreement within the meaning of Article L.2261-9 of the French Labour Code. There is therefore no 15-month survival period (3 months’ notice + 12 months), no obligation to negotiate a substitution agreement, and no remuneration guarantee within the meaning of Article L.2261-13. This distinction is fundamental and constitutes an advantage for the employer who wishes to withdraw from its undertaking.

Precautions the Employer Should Take

Before Committing

Before voluntarily applying a collective agreement, the employer should assess all the consequences of its choice:

• Assess the overall cost: minimum wages, contractual bonuses, enhanced severance indemnities, mandatory supplementary insurance scheme, additional leave
• Check compatibility with any agreement already applicable, to avoid a costly overlap
• Draft precisely the contractual clause or undertaking memo to delineate exactly the scope of application
• Anticipate the possibility of termination by avoiding irreversible contractual undertakings

During Application

The employer must ensure that it actually applies all the provisions to which it has committed. Partial or intermittent application exposes the company to back-pay and benefit claims over three years (three-year limitation period under Article L.3245-1 of the French Labour Code), and even to damages for bad-faith performance of the employment contract.

The employer must also keep pace with the developments of the voluntarily applied agreement: amendments, revisions, and new provisions apply to it to the same extent as the original provisions.

In the Event of Termination

Termination must be carefully prepared: assembling a supporting file, strictly complying with the information procedure, granting a reasonable notice period, and, where possible, opening negotiations with employee representatives to support the transition.

Litigation Risks

Disputes relating to voluntary application are frequent and mainly concern:

• The reclassification of partial application as full application
• Failure to comply with the custom-termination procedure
• The calculation of back-pay and agreement-based benefits
• Determining which agreement actually applies in the event of conflict

In the event of litigation, the burden of proof is allocated differently depending on the situation: it is for the employee to prove the existence of the employer’s voluntary undertaking, but it is for the employer to demonstrate that it duly terminated that undertaking.

Awards can be significant: back-pay over three years, damages, and even the nullity of the dismissal where the termination of a contractual benefit led to a wrongful dismissal.

FAQ — Voluntary Application of a Collective Bargaining Agreement

Does mentioning a collective agreement on the payslip bind the employer?

Yes. The settled case law of the Cour de cassation holds that mentioning a collective agreement on the payslip creates a presumption of voluntary application. The employer is then bound to apply the provisions of that agreement, unless it can prove that it was a clerical error—which remains very difficult in practice.

Can the employer apply only certain provisions of an agreement?

In principle, voluntary application entails applying all of the agreement’s provisions. However, if the employer’s undertaking is expressly limited to certain provisions (through a precise contractual clause or a targeted unilateral undertaking), the courts may allow partial application. The drafting of the undertaking is therefore decisive.

How can voluntary application of a collective agreement be ended?

If the application results from a custom or a unilateral undertaking, the employer may terminate it by informing employee representatives and each employee individually, while observing a sufficient notice period. If the application results from a contractual clause, the consent of each employee is required.

What is the difference between terminating a custom and terminating a collective agreement?

Terminating a custom (voluntary application) follows the simple case-law procedure: informing employee representatives, informing employees individually, and observing a notice period. Terminating a collective agreement in the strict sense follows the statutory regime of Articles L.2261-9 et seq. of the French Labour Code, with a 3-month notice period, a 12-month survival period, and an obligation to negotiate a substitution agreement.

Does voluntary application create a vested individual benefit?

Not in the strict sense. The concept of a vested individual benefit (avantage individuel acquis—now replaced by the remuneration guarantee since the 2016 Labour Act, or loi Travail) applies only to the termination of an agreement or collective accord within the statutory meaning. The termination of a voluntary-application custom ends the benefit for the future, without any continuation as a vested individual benefit.