Differences between CDI and CDD: legal and practical aspects

Introduction

The employment contract is at the heart of the relationship between employer and employee. In France, two forms dominate the employment landscape: the fixed-term employment contract (CDI – contrat à durée indéterminée), which constitutes the legal norm, and the fixed-term employment contract (CDD – contrat à durée déterminée), a strictly regulated derogatory regime. Understanding the differences between CDI and CDD from their legal and practical angles is essential for any HR manager, SME director or company lawyer. Between conditions for use, mandatory provisions, termination methods and signature formalities, the stakes are considerable. This article provides you with comprehensive and up-to-date guidance to secure your contractual practices in 2026.

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Legal nature and legal foundations

The CDI: contract of general law

Under Article L.1221-2 of the French Labour Code, "the employment contract is presumed to be concluded for an indefinite term". The CDI is therefore the normal and general form of the employment relationship. It requires no particular reason for its conclusion and can be established without a fixed end date. Its written form is not mandatory for a full-time CDI, but is highly recommended for evidential reasons and clarity of reciprocal obligations.

The CDI can be concluded on a full-time or part-time basis. In the latter case, Article L.3123-6 of the Labour Code mandatorily requires the drawing up of a written contract containing several mandatory provisions (weekly or monthly duration, schedule distribution, conditions for modification, etc.).

The CDD: a derogatory regime and strictly regulated

The CDD is governed by Articles L.1242-1 to L.1242-12-1 of the Labour Code. It can only be concluded in specific cases laid down by law:

• Replacement of an absent employee (illness, maternity leave, etc.)

• Temporary increase in activity

• Seasonal employment

• Contracts of custom in certain professional sectors (audiovisual, hospitality and catering, etc.)

• Contracts concluded within the framework of employment policy (apprenticeship contract, professional development contract, CIE, etc.)

Unlike the CDI, the CDD must be drawn up in writing (Art. L.1242-12 of the Labour Code). The absence of a written form results in automatic reclassification as a CDI, a particularly severe sanction for the employer.

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Mandatory provisions and contract content

Clauses common to both contracts

Whether it is a CDI or a CDD, certain provisions are essential:

• Identity of the parties (employer and employee)

• Nature of the position and statutory classification

• Place of work

• Remuneration (basic salary, bonuses, benefits in kind)

• Working hours (full-time or part-time)

• References to the applicable collective bargaining agreement

• Trial period if applicable

The management of employment contracts in companies also involves ensuring the integration of specific clauses according to needs: confidentiality clause, non-competition clause, mobility clause, etc. These clauses must be proportionate and justified to be valid.

Provisions specific to the CDD

Article L.1242-12 of the Labour Code requires additional provisions for the CDD:

• The precise reason for resorting to the CDD (replacement, temporary increase in activity, etc.)

• The end date of the contract or, if the term is uncertain, the minimum duration of the contract

• The name and qualification of the employee being replaced (in case of replacement)

• The indication of the applicable collective bargaining agreement

• The duration of the trial period if any

• The designation of the supplementary pension fund and the insurance organisation

The omission of any of these provisions exposes the employer to reclassification of the CDD as a CDI, decided by the Employment Court at the request of the employee.

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Duration, renewal and succession of contracts

The duration of the CDD: rules and limits

The maximum duration of a CDD is in principle set at 18 months, renewals included (Art. L.1242-8 of the Labour Code). Exceptions exist: 24 months for contracts performed abroad, 9 months for certain urgent work. The CDD can be renewed a maximum of twice.

Since the law of 5 September 2018 (the "Future Employment" law), social partners can negotiate sectoral agreements setting specific rules for renewal and succession of CDDs. These sectoral agreements thus derogate from the legal provisions as a default rule.

The waiting period between two CDDs

To prevent any abuse of recourse, the law requires a waiting period between two successive CDDs on the same position. This period is equal to:

• 1/3 of the duration of the expired contract if its duration is 14 days or more

• 1/2 of the duration of the expired contract if its duration is less than 14 days

Certain cases are exempt from this waiting period: replacement of a newly absent employee, urgent work, seasonal employment, contracts of custom, etc.

The CDI: no time limit

By definition, the CDI is not subject to any time limit. It ends only in case of termination (resignation, dismissal, consensual termination, retirement, force majeure or death). This permanence is one of the fundamental attractions of the CDI for the employee, who benefits from enhanced job security.

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Termination of contract: profoundly different regimes

Termination of the CDI

Termination of the CDI is strictly regulated and can occur in several ways:

Resignation: unilateral act of the employee, subject to the observance of a notice period whose duration is fixed by law, the collective bargaining agreement or the contract. Resignation does not entitle the employee to unemployment benefit, except in cases of legitimate resignation as defined by France Travail (formerly Pôle Emploi).

Dismissal: unilateral act of the employer, which must be based on a genuine and serious reason (Art. L.1232-1 of the Labour Code). The procedure is formalised: summons to prior interview, written notification with grounds, observance of notice period. In case of dismissal without genuine and serious reason, the employee can claim compensation according to the Macron scale (Art. L.1235-3), the amount of which varies from 0.5 to 20 months' salary depending on length of service and company size.

Consensual termination: amicable mode introduced by the law of 25 June 2008, approved by the DREETS (Regional Directorate of Economy, Employment, Labour and Solidarity). It entitles the employee to unemployment benefit and allows the employer to secure the separation. Since 2023, it is subject to a social contribution of 30%.

Early termination of the CDD: a much more restricted framework

Early termination of a CDD is possible only in limited cases:

• Agreement of the parties (amicable termination)

• Gross misconduct of the employee or employer

• Force majeure

• Incapacity established by the occupational health physician

• Recruitment on a CDI by another employer (in this case, the employee must observe a notice period equal to one day per week of CDD remaining, not exceeding two weeks)

Outside these cases, early termination exposes the responsible party to substantial damages. If it is the employer who unilaterally terminates, it must pay the employee the salaries they would have received until the end of the contract.

End of contract compensation: a specific feature of the CDD

At the end of a CDD, the employee receives an end of contract allowance (or severance compensation) equal to 10% of the total gross remuneration paid during the contract (Art. L.1243-8 of the Labour Code). Certain contracts are exempt from this: seasonal CDDs, apprenticeship contracts, professional development contracts, or when a CDI is offered at the end of the CDD.

This allowance represents a non-negligible cost for the employer and must be integrated into the economic calculation when choosing between CDI and CDD.

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Contract formalities and electronic signature

Deadlines for transmission and delivery of the contract

For the CDD, Article L.1242-13 of the Labour Code requires that the contract be delivered to the employee within 2 working days following hire. This very tight deadline puts HR teams under pressure, particularly during urgent hiring. Failure to meet this deadline is treated as absence of written form and results in reclassification as a CDI.

For a part-time CDI or CDIs with particular clauses, the recommended deadline is to deliver the contract no later than the first working day.

Electronic signature: a decisive advantage for HR

Dematerialisation of employment contracts is today a legally secure reality. The comprehensive guide to electronic signature enables you to understand the basics of this system, which is based on eIDAS Regulation No. 910/2014 and Articles 1366 and 1367 of the French Civil Code.

For HR teams managing large volumes of CDI and CDD, electronic signature solutions for HR enable compliance with legal transmission deadlines (in particular the 48-hour deadline for CDD), eliminate postal round-trips, centralise and archive signed contracts with probative value equivalent to handwritten signature.

The electronic signature ROI calculator allows you to accurately assess potential gains according to your contract volume. On average, an SME of 50 employees carrying out 40 hires per year (CDI/CDD mix) can save between 15 and 25 hours of administrative processing per year, according to sector benchmarks published by APEC and specialist firms in HR digital transformation.

It is important to choose the right level of signature: for employment contracts, advanced electronic signature (AES) is generally recommended, guaranteeing reliable identification of the signatory and document integrity. For high-stakes contracts (non-competition clauses, consensual termination), qualified electronic signature (QES) may be preferred. You will find a comparison of electronic signature solutions to choose the solution suited to your context.

Applicable legal framework for CDI and CDD contracts

Labour Code: the founding texts

The legal regime of the CDI and CDD is principally governed by the Labour Code:

• Art. L.1221-2: presumption of indefinite-term contract

• Art. L.1242-1 to L.1242-12-1: conditions for use, mandatory provisions and duration of CDD

• Art. L.1242-13: deadline for delivery of CDD to employee (2 working days)

• Art. L.1243-8: end of contract allowance (10% of gross remuneration)

• Art. L.1232-1: requirement for genuine and serious reason for dismissal

• Art. L.1235-3: compensation scale in case of dismissal without genuine and serious reason (Macron scale, validated by the Court of Cassation on 11 May 2022)

• Art. L.3123-6: mandatory provisions of part-time contract

Reclassification: risks and consequences

Reclassification of a CDD as a CDI is a judicial sanction pronounced by the Employment Court when the legal conditions for recourse to the CDD have not been met (reason absent or insufficient, absence of written form, exceeding maximum duration, failure to observe waiting period). It results in:

• Payment of a reclassification allowance of at least one month's salary (Art. L.1245-2 of the Labour Code)

• Recognition of seniority from the date of the first irregular CDD for calculation of severance compensation

• Risk of condemnation for costs and legal fees

Electronic signature and probative value

Electronic signature of employment contracts is expressly recognised by French law. Article 1366 of the Civil Code provides that "electronic writing has the same probative force as writing on paper", and Article 1367 specifies that "electronic signature consists in the use of a reliable process of identification guaranteeing its link with the act to which it is attached".

eIDAS Regulation No. 910/2014 (European Union) establishes the technical and legal framework for electronic signatures: simple (SES), advanced (AES) and qualified (QES). For employment contracts, the Court of Cassation and mainstream doctrine recommend at a minimum advanced electronic signature, or even qualified signature for the most formalised acts.

Technical standards ETSI EN 319 132 (XAdES) and ETSI EN 319 122 (CAdES) govern the formats of advanced electronic signature usable for long-term archiving of contracts.

Finally, GDPR No. 2016/679 imposes protection of signatories' personal data throughout the electronic signature process: minimisation of collected data, limited retention period, signatory employee's right of access and rectification. Qualified trust service providers (QTSP) under eIDAS offer integrated GDPR compliance guarantees.

Use scenarios: CDI, CDD and electronic signature in practice

Scenario 1: an industrial SME with high recourse to seasonal CDDs

An industrial SME of around 80 permanent employees employs between 40 and 60 seasonal workers per year on CDD contracts of 3 to 6 months. Before dematerialisation, HR printed and sent contracts by registered post, regularly exposing the company to overruns of the legal 48-hour deadline (Art. L.1242-13 of the Labour Code). Two reclassifications as CDI had been pronounced by the Employment Court over the previous five years, representing a total estimated cost of €22,000.

Since adopting an advanced electronic signature solution compliant with eIDAS, CDD contracts are generated from a template pre-validated by the legal department, sent and signed in an average of 1 hour 45 minutes (versus 4 to 7 working days previously). The 48-hour deadline is systematically met. The reclassification rate has been brought down to zero over the following two fiscal years, and the HR department has recovered approximately 30 hours per season on administrative tasks.

Scenario 2: a management consulting firm managing a CDI/CDD mix for replacement

A consulting firm of around fifty staff members carries out on average 25 hires per year: 15 CDIs and 10 CDD replacements (maternity leave, long-term sick leave). HR policy requires contract signature before the first day of work for insurance and internal compliance reasons.

By integrating an electronic signature tool into their HRIS, the firm has reduced the average time for contracts to be returned signed from 8 days to less than 24 hours. Candidates sign from their smartphone, with no need to travel. Automatic archiving in a certified digital safe guarantees probative value in the event of employment litigation. The firm estimates it has avoided 2 to 3 situations of non-formalised work per year, each potentially generating legal risk.

Scenario 3: a multi-site distribution group optimising the management of part-time contracts

A network of distribution with around twenty points of sale across the country manages approximately 300 active contracts, of which 60% CDI part-time and 40% seasonal CDDs. The multiplicity of sites made contract management complex, with risks of errors on mandatory provisions specific to part-time work (Art. L.3123-6 of the Labour Code).

The implementation of an AI-powered contract generator coupled with an electronic signature solution has made it possible to standardise contract templates by job type and contract type. Result: 40% reduction in mandatory provision errors, estimated gain of 50 hours of HR processing per month across the entire network, and complete traceability of signed versions accessible at any time from the centralised platform.

Conclusion

Mastering the differences between CDI and CDD is a legal and operational imperative for any company seeking to secure its employment relationships. CDI as a legal norm, CDD as a strictly regulated derogatory regime: substantive issues (reasons for use, duration, renewal) combine with precise formal obligations (mandatory provisions, delivery deadline, end of contract allowance) whose non-compliance exposes the employer to costly reclassifications.

In this context, dematerialisation and electronic signature represent powerful levers for complying with legal deadlines, ensuring reliable contractual documents and securing archives. Certyneo accompanies you in this transition with a solution compliant with eIDAS, GDPR and the Civil Code, suited to the HR challenges of SMEs and large companies alike.

Discover how Certyneo can transform your management of employment contracts → Try Certyneo for free or check our pricing.