Cour de cassation on Equal Pay Evidence

Cour de cassation, chambre sociale, 16 décembre 2008, pourvoi No. 07 42 107, is a useful French labour law decision for salary and equal pay disputes. It is not, strictly speaking, a prescription case. Its main holdings concern two related employment questions: whether an individual working time forfait could be relied on without a written agreement, and whether different university diplomas could justify different salaries for employees doing the same work. Its relevance to employment claim disputes is indirect but still important. Before a court decides whether a salary claim is too late, it usually has to understand whether the salary was due in the first place.

The full citation is Cour de cassation, chambre sociale, 16 décembre 2008, No. de pourvoi 07 42 107, published in the Bulletin, Bull. civ. V, No. 250, with the appealed decision coming from the Cour d’appel de Paris, 27 February 2007. The record identifies Mme Collomp as President, M. Gosselin as rapporteur and M. Duplat as Avocat général. These details are useful because several French decisions were delivered around the same period, and this particular Social Chamber judgment has a specific place in the line of authority on salary equality and working time arrangements.

The facts were quite ordinary, which is partly why the case is useful. Mme X worked for Fauchon from 1 February 2000 under an indefinite term contract as a commercial assistant. On 1 October 2000, she was promoted to export zone manager. She was later dismissed for serious misconduct on 25 May 2004. After dismissal, she brought proceedings before the labour courts. Among other claims, she sought a ruling that the dismissal lacked real and serious cause, payment of salary arrears for overtime, and damages for unequal salary treatment. The legal interest of the case came from the employer’s explanations for resisting those salary related claims.

The first issue concerned working time. The employer relied on a forfait arrangement for a managerial employee. The Court of Appeal had accepted that the arrangement could be shown by surrounding circumstances, including the employee’s status, payslips and the absence of earlier protest. The Court of Cassation rejected that approach. Where the French Labour Code required an individual written agreement, the employer could not replace writing with inference, silence or payroll practice. The point may look formal, but in wage disputes formal requirements often protect employees from being treated as having waived rights they never clearly gave up.

The second issue concerned equal pay. The employer attempted to justify a salary difference between employees doing the same work by pointing to different diplomas. The Social Chamber accepted, sensibly, that qualifications may sometimes justify different pay. It did not say that diplomas are irrelevant. But it refused to treat a different diploma as an automatic answer. Where employees perform the same function and hold diplomas of equivalent level, the employer must show why the particular diploma of the better paid employee gives special knowledge that is useful for the work actually performed.

That is the central lesson of the case. Equal work does not always mean identical pay in every situation, but unequal pay needs a reason that is objective, relevant and connected to the job. A court should not accept a broad managerial statement that one employee had a better credential. It should ask what the credential added to the work. Was it a qualification required for the role? Did it give technical knowledge that the job actually used? Was the level of training different in a meaningful way? Or was the diploma simply a convenient label offered after the salary gap had already been challenged?

The Court of Cassation found that the Court of Appeal had not carried out that inquiry properly. Mme X and the comparator performed the same export zone function and held diplomas of equivalent level. The lower court should have explained why the comparator’s diplomas were specifically useful to that function. Since it had not done so, its reasoning could not stand. This is a fairly restrained decision. It does not punish employers for recognising qualifications. It simply asks them to show the connection between the qualification and the pay difference.

The rule can be stated in two parts. First, an employer who invokes a working time arrangement that must be written must produce the required written agreement. Conduct and payslips will not cure the absence of writing where the law insists on a written instrument. Second, an employer who pays employees differently for the same work must provide an objective and relevant justification. A difference in diplomas may justify a difference in salary only where the employer proves that the specific diploma relied on supplies knowledge useful to the work. The judge must examine that justification concretely.

The precedent value for Rwandan litigation is persuasive, not binding. A French Cour de cassation decision does not control a Rwandan court the way a domestic Supreme Court authority might. Still, the case has comparative value because it has been noticed in Rwanda Law Reports. In SONARWA Life Assurance Company Ltd v Rugina, Supreme Court, RS/INJUST/RSOC 00001/2022/SC, judgment of 8 July 2022, reported in [2023] 1 RLR, the French case is listed among authorities referred to in a salary arrears and equal pay context. That makes it a useful comparative support when used carefully alongside Rwandan law.

The link with prescription should also be handled with care. The French case did not decide when limitation begins to run for salary claims. SONARWA v Rugina is the Rwandan authority that discusses salary arrears, equality of pay, the prescription period for salary payment claims and situations that may affect the running of time, including acknowledgment of a debt or pending proceedings. The French decision helps with the prior question: was there an unjustified salary difference or unpaid salary right at all? Once that underlying right is understood, the court can then ask whether the claim was brought within time.

The decision matters because many employment disputes turn on labels. An employer may say that the employee accepted the salary, that a working time arrangement applied, or that another worker earned more because of better credentials. Those explanations may be true in some cases. But the Social Chamber’s reasoning asks for proof rather than slogans. A forfait must be written where writing is required. A salary difference based on qualifications must be connected to the work. That kind of reasoning is attractive because it gives courts a practical evidential test rather than a general fairness speech.

For employees and their lawyers, the case suggests a disciplined way to prepare salary claims. It is not enough to complain that someone else earned more. The claimant should gather the employment contract, promotion letters, job descriptions, payslips, internal salary structures, correspondence requesting arrears, labour inspectorate records where relevant, and evidence showing the grade or salary of comparators. In an equal pay claim, the claimant should show that the comparator performed the same or equivalent work and was at the same level. The stronger the factual comparison, the harder it becomes for the employer to hide behind vague differences.

For employers, the lesson is not that salary differences are forbidden. They may be justified by genuine differences in responsibility, measurable performance, scarce technical skills, relevant professional qualifications, or experience that matters to the role. But those reasons should be documented when the salary is fixed, not invented after litigation begins. Employers should also ensure that working time arrangements requiring written consent are properly signed and kept in the employee’s file. A casual paper trail can turn a manageable workplace disagreement into a claim for arrears, overtime, damages or related adjustments.

The French decision also fits into a broader line of authority. The well known Ponsolle decision of 29 October 1996 treated equal remuneration as part of the broader principle that employees placed in an identical situation should receive equal pay. The 2008 decision refined that principle by focusing on diplomas. Later French decisions show that the 2008 case did not make qualifications useless. A diploma required by a collective agreement, or a qualification that reflects a higher level and duration of training and is useful to the role, may justify different pay. The nuance is important. The rule is not anti employer or anti qualification. It is anti assumption.

For Rwandan lawyers, the best use of Cour de cassation No. 07 42 107 is comparative and targeted. It should not replace domestic provisions or domestic precedent. Rather, it can support the argument that courts should examine the employer’s justification for salary differences with care. SONARWA v Rugina supplies the domestic context on salary equality, arrears and prescription. The French case adds persuasive reasoning on why a court should insist on objective, relevant and work related proof. Used that way, the decision can help transform an equal pay argument from a moral complaint into a concrete evidential inquiry.

Source note. This article is based on Cour de cassation, chambre sociale, 16 décembre 2008, pourvoi No. 07-42.107, and on its comparative use in the Rwandan salary-arrears context through SONARWA Life Assurance Company Ltd v Rugina, Supreme Court, RS/INJUST/RSOC 00001/2022/SC, judgment delivered on 8 July 2022, reported in [2023] 1 Rwanda Law Reports. It is prepared for public legal education and comparative legal discussion only, and should not be treated as legal advice for any specific employment dispute.

Suggested citation

Ronald Serwanga, “Cour de cassation on Equal Pay Evidence” East Africa Legal Insight (12 June 2026).