Legal Agreement in Labour Law: Employer's Obligations

Introduction: Why Legal Agreements are at the Heart of Labour Law

In France, the relationship between an employer and its employees rests on a set of legal agreements that structure each stage of professional life: employment contract, collective agreement, amendment, termination by agreement, non-compete clause… Each of these documents engages the company's legal responsibility. Yet many employers underestimate the extent of their formal obligations, thus exposing themselves to costly employment tribunal disputes. Understanding what constitutes a legal agreement in labour law and the obligations it places on the employer is therefore essential for any organisation, regardless of size. This article details the foundations, practical requirements and modern tools to meet them effectively.

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The Different Types of Legal Agreements in Labour Law

The Employment Contract: Foundation of the Salaried Relationship

The employment contract is the foundational legal agreement between employer and employee. Under Article L. 1221-1 of the Labour Code, it is formed as soon as a person undertakes to work in return for remuneration under the authority of another. While the law does not systematically require written form for permanent contracts (CDI) in full-time positions, practice and case law make it virtually mandatory.

For fixed-term contracts (CDD), part-time CDIs, temporary work contracts and apprenticeship contracts, written form is imperative under penalty of reclassification. Article L. 1242-12 of the Labour Code provides that the absence of written form for a CDD automatically leads to its reclassification as a CDI.

The employer must notably mention in the contract:

• The identity of the parties

• The start date of the relationship

• The description of the position and place of work

• Remuneration

• Working hours

• The applicable collective agreement

Collective Agreements and Company-Level Negotiation

Since the Macron ordinances of 2017 (ordinances no. 2017-1385 to 2017-1389), company-level collective negotiation has been considerably strengthened. Company agreements can now take precedence over industry agreements in many areas: working hours, organisation, remuneration, internal mobility.

The employer is required to negotiate annually (NAO) on salaries, professional equality and quality of working life (articles L. 2242-1 et seq. of the Labour Code). Failure to comply with this obligation exposes the employer to criminal sanctions and the inability to access certain public subsidies.

A collective agreement must be signed by unions representing at least 50% of votes cast in the most recent professional elections (article L. 2232-12), unless a minority agreement is subject to a referendum.

Amendments and Contractual Modifications

Any modification to the employment contract affecting an essential element — remuneration, working hours, qualification, place of work — must be made by means of a written amendment signed by both parties. The Court of Cassation constantly reminds that the employer cannot unilaterally impose such a modification (Cass. soc., 10 July 1996, no. 93-41.137).

The acceptance procedure imposes a reasonable period for reflection: in practice, a minimum of one month is allowed to the employee, and in case of refusal, the employer may initiate dismissal proceedings for personal or economic reasons, depending on the circumstances.

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The Employer's Formal Obligations When Concluding an Agreement

Prior Notification to the Employee

The employer has a general obligation of information and good faith in the conclusion of any legal agreement in labour law. Article L. 1222-1 of the Labour Code provides that the employment contract is performed in good faith. This requirement begins at the pre-contractual stage.

For hirings since 1 August 2022, European Directive 2019/1152 on transparent working conditions, transposed by ordinance no. 2022-1292, strengthens this obligation. The employer must provide the employee, within the first seven days, with a written document containing the essential information on the working relationship.

The Provision of Mandatory Documents

Concretely, with each agreement or modification, the employer must provide:

• A signed copy of the contract or amendment

• The payslip mentioning the applicable collective agreement

• The internal regulations for companies with more than 50 employees (article L. 1311-1)

• The collective agreements applicable, accessible on request by the employee

Since the progressive dematerialisation imposed by law, electronic signature for HR teams has become a major solution to guarantee the traceability and legal value of these documentary deliveries.

Registration and Publication of Collective Agreements

Any collective agreement must be deposited on the TéléAccords platform of the Ministry of Labour, in accordance with article L. 2231-6 of the Labour Code, within 15 days following its signature. This deposit conditions its entry into force and its publication which can be relied upon against third parties. Failure to deposit can deprive the agreement of any effect.

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The Legal Value of Signature in Work Agreements

Handwritten Signature vs Electronic Signature

Historically, handwritten signature was the sole method of validating a legal agreement in labour law. However, since the transposition of the eIDAS regulation into French law, electronic signature has full legal validity (article 1367 of the Civil Code). To explore this subject further, our comprehensive guide to electronic signature details the different levels of signature and their applicability.

The Court of Cassation has validated electronic signature in several employment tribunal disputes, provided it guarantees the identification of the signatory and the integrity of the document. Qualified signature (the highest level under the eIDAS regulation) is equivalent to handwritten signature.

What Level of Signature for Which HR Documents?

The choice of signature level must be adapted to the legal risk of the document:

• Simple signature: suitable for less important documents (internal convocations, meeting minutes)

• Advanced signature: recommended for standard employment contracts, amendments, teleworking agreements

• Qualified signature: required or strongly recommended for termination by agreement, transactions, dismissals

To understand the technical and regulatory differences between these levels, the eIDAS 2.0 Regulation explained on Certyneo is a useful reference.

The Risks Linked to Non-Compliant Signature

An agreement not validly signed may be declared null or unenforceable by the employment tribunal. In practice, this may result in:

• Reclassification of a CDD as a CDI

• Nullity of a non-compete clause

• Unenforceability of a mobility clause

• Challenge of a homologated termination by agreement

The financial stake can be considerable: reclassification compensation, back-pay, damages and interest. Companies that have adopted a compliant electronic signature solution significantly reduce this operational risk.

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Dematerialisation of Work Agreements: Issues and Best Practices

The Legal Framework for HR Dematerialisation

Law no. 2016-1088 of 8 August 2016 (El Khomri Law) opened the way to dematerialisation of payslips, and progressively of contracts and HR documents. Since 2022, virtually all contractual documents can be dematerialised, provided that the conditions of employee consent and document accessibility are respected.

Obligations Regarding Retention and Archiving

The employer is required to keep employment contracts for 5 years after the end of the contractual relationship (civil limitation period, article 2224 of the Civil Code) and up to 10 years for certain social documents. Electronic archiving with probative value (NF Z 42-013 standard) is recommended to guarantee the integrity of evidence in case of dispute.

For companies wishing to optimise their documentary organisation, the electronic signature ROI calculator allows you to assess the concrete gains of a complete dematerialisation of HR processes.

Legal Framework Applicable to Legal Agreements in Labour Law

The validity and enforceability of legal agreements in labour law rely on a dense body of rules, combining national and European law.

Labour Code: articles L. 1221-1 to L. 1242-17 regulate the formation and conditions of validity of employment contracts. Articles L. 2231-1 to L. 2232-29 govern negotiation and deposit of collective agreements. Non-compliance with these provisions exposes the employer to criminal sanctions that can reach €3,750 per affected employee (articles R. 1227-1 et seq.).

Civil Code: article 1366 recognises the legal value of electronic documents and article 1367 establishes electronic signature as a valid mode of signature, provided it allows identification of the signatory and guarantees the integrity of the document.

eIDAS Regulation no. 910/2014: this European regulation establishes three levels of electronic signature (simple, advanced, qualified). Qualified signature, performed via a qualified trust service provider (QTSP) registered on the European trust list (TSL), is legally equivalent to handwritten signature in all Member States. The eIDAS 2.0 revision (Regulation no. 2024/1183, applicable from 2026) strengthens these requirements with the introduction of the European Digital Identity Wallet (EUDI Wallet).

GDPR no. 2016/679: the collection and processing of personal data of signatories (identity, timestamp, IP address) in the context of electronic signature must comply with the principles of minimisation, purpose limitation and security. The employer, as data controller, must update its record of processing activities and, where applicable, carry out an impact assessment (DPIA).

ETSI Standards: the ETSI EN 319 132 standard defines advanced electronic signature formats XAdES (XML), PAdES (PDF) and CAdES (binary data). For HR agreements in PDF format, the PAdES format is the reference standard ensuring long-term validity (LTV).

Directive 2019/1152 transposed by ordinance no. 2022-1292: requires the employer to provide the employee, within the first seven days of employment, with essential information relating to the working relationship, including in electronic form.

Legal Risks: in case of dispute, the burden of proving the formal regularity of the agreement falls on the employer. An agreement signed via a non-compliant eIDAS solution may be challenged before the Employment Tribunal, resulting in its nullity and condemnations that may represent tens of thousands of euros in damages and interest.

Concrete Use Scenarios

Scenario 1: An Industrial SME Managing More Than 300 Contracts and Amendments Per Year

An industrial SME of around 280 employees, based on three sites, faces a significant volume of HR documents each year: seasonal contracts, internal mobility amendments, working time modulation agreements. Previously, the process involved printing, postal delivery and digitisation of signed documents, generating average lead times of 12 to 18 days and an error rate (forgotten signature, missing copy) estimated at 15%.

By deploying an advanced electronic signature solution compliant with eIDAS, the HR department reduced the average signature lead time to less than 48 hours. The documentary error rate fell below 2%. Automatic archiving with probative value also simplified the management of employment tribunal disputes, with the legal department having a timestamped and unfalsifiable proof for each document. According to sectoral studies (Markess by exægis, 2024), this type of deployment generally generates a reduction of 60 to 70% in HR administrative processing costs.

Scenario 2: An Accounting Firm Managing HR for Several Micro-Enterprise Clients

An accounting firm supporting around twenty micro-enterprises in their social management (payroll, contracts, declarations) faces the multiplication of contractual documents to be signed urgently, particularly for replacement CDDs. Short lead times and geographical dispersal of managers made handwritten signature impractical.

By integrating an electronic signature platform into its workflow, the firm was able to offer its micro-enterprise clients a remote signature service, operational in less than two hours for a CDD. The legal compliance of each document is guaranteed by the advanced signature level, with complete audit trail. Claims related to poorly formalised documents decreased by 80% over the 18 months following deployment, according to comparable data published by the CSOEC (Superior Council of the Order of Accounting Experts).

Scenario 3: A Retail Chain Managing Large-Scale Terminations by Agreement

A retail chain with several hundred sales points is regularly led to conclude terminations by agreement with employees throughout France. Each procedure involves two interviews, a jointly signed Cerfa form and a homologation application to the DREETS.

By opting for qualified electronic signature for the Cerfa form (a high-stakes legal document), the chain legally secured all its procedures while reducing finalisation lead times by 30%. The legal department has a centralised documentary reference system, facilitating internal audits and labour inspectorate checks. The traceability provided by qualified timestamping made it possible to quickly resolve two employment tribunal disputes concerning the actual signature date.

Conclusion

Legal agreements in labour law form the foundation of any secure salaried relationship. The employer must master not only substantive requirements — clause content, respect of deadlines, negotiation obligations — but also formal requirements, in particular the validity of the signature affixed to each document. In the age of dematerialisation, eIDAS-compliant electronic signature has become an essential standard for guaranteeing the probative value of HR documents, reducing lead times and preventing disputes.

Certyneo supports employers in bringing their HR document processes into compliance through a certified electronic signature platform that is simple to deploy and perfectly integrated with existing business tools. Discover our features dedicated to HR teams and assess the return on investment of your dematerialisation project by consulting our ROI calculator or by contacting our team.