CDI vs CDD: Legal and practical differences

Introduction

CDI vs CDD: behind these three letters lie two fundamentally distinct legal regimes that structure the vast majority of employment relationships in France. In 2026, DARES still records over 85% of hiring on CDD terms, while the CDI remains the reference standard affirmed by the Labour Code. Yet employees and employers still regularly confuse their respective rights and obligations. Duration, grounds for use, drafting formalities, termination conditions, notice periods, written signature requirements: every detail counts to avoid costly judicial requalification. This article provides a comprehensive and practical overview of the legal differences between CDI and CDD, incorporating recent developments in case law and best practices for contract digitalisation.

---

1. Definitions and scope of application: CDI and CDD under French law

The CDI, a contract of general application

The open-ended employment contract (CDI) is defined in article L. 1221-2 of the Labour Code as the normal and general form of employment relationship. It contains no predefined end date and operates as a legal presumption: in the absence of a written formalised contract, any employment contract is presumed to be a CDI. The employer does not need to justify any particular reason for hiring on a CDI. The employee benefits from enhanced protection against unilateral termination: dismissal subject to real and serious cause, respect for a contradictory procedure, payment of statutory or contractual severance.

In practice, the CDI may be full-time or part-time, and may include specific clauses (probation period, non-compete clause, mobility clause) provided they comply with mandatory employment law principles.

The CDD, a strictly regulated exceptional contract

The fixed-term employment contract (CDD) is governed by articles L. 1242-1 to L. 1248-11 of the Labour Code. It may only be concluded for the performance of a specific and temporary task, and solely in the cases exhaustively listed by law:

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

• Temporary increase in activity

• Seasonal employment

• Contracts of custom (sectors defined by decree or collective agreement)

• Senior CDD (employee aged 57 and over)

• CDD with defined purpose (executives and engineers, 18 to 36 months duration)

It is strictly prohibited to resort to CDD to permanently fill a post linked to the normal and permanent activity of the business (article L. 1242-1 of the Labour Code). Any breach exposes the employer to requalification as a CDI by the Industrial Tribunal, coupled with an indemnity floor equivalent to one month's salary.

---

2. Mandatory formalities and written obligations

The written contract: mandatory for CDD, strongly recommended for CDI

A CDD must imperatively be drawn up in writing (article L. 1242-12 of the Labour Code) and handed to the employee no later than 2 working days after hiring. Failing this, the contract is automatically requalified as a CDI by the courts, which the employer cannot challenge.

The CDD contract must mandatorily state:

• The precise ground for use

• The start and end date (or minimum duration for CDDs without a fixed term)

• The position held

• The applicable collective agreement

• Remuneration and its components

• The duration of any probation period

For the CDI, no written obligation is imposed by the Labour Code for full-time contracts (except as otherwise provided by collective agreements). However, European Directive 2019/1152 — transposed into French law by ordinance of 2 November 2023 — requires the employer to provide the employee with a written statement of the essential conditions of the contract within 7 calendar days of hiring. In practice, drafting a written contract remains essential to secure the contractual relationship and avoid any proof disputes.

Electronic signature for human resources is today the reference solution for fully digitalising this process, with probative value equivalent to handwritten signature.

The probation period: distinct rules depending on the contract

For the CDI, the probation period is governed by article L. 1221-19 of the Labour Code. Its maximum legal duration is 2 months for workers and employees, 3 months for supervisors and technicians, 4 months for executives. It may be renewed once if the collective agreement expressly provides for this.

For the CDD, the probation period is proportionate to the contract duration: one day per week of contract, up to a maximum of 2 weeks for contracts of less than 6 months, and one month for contracts of 6 months or more (article L. 1242-10 of the Labour Code).

---

3. Duration, renewal and notice period

Maximum duration of the CDD

The total duration of a CDD, including renewals, cannot exceed 18 months in the general case. Derogatory durations exist:

• 9 months whilst awaiting the entry into service of a CDI employee or to carry out urgent safety work

• 24 months for contracts performed abroad or in the event of an exceptional export order

• 36 months for a CDD with defined purpose

A CDD may be renewed a maximum of twice within the limit of its total authorised duration, provided the ground for use remains valid (article L. 1243-13 of the Labour Code, as amended by law n° 2023-1107 of 29 November 2023 known as the "job market" law).

The notice period: a frequently overlooked rule

Between two successive CDDs relating to the same position, the employer must observe a notice period calculated according to the duration of the first contract (article L. 1244-3 of the Labour Code):

• One third of the total duration of the contract (including renewals) if the CDD is 14 days or more

• Half the total duration if the CDD is less than 14 days

This period does not apply in case of replacement of an absent employee, urgent work or seasonal employment. Its non-observance results in requalification as a CDI.

To secure these periods and maintain faultless traceability of each signed contract, use of an AI-powered contract generator incorporating calendar alerts represents a significant advance for HR departments.

---

4. Contract termination: radical asymmetry between CDI and CDD

CDI termination: procedure and severance

Termination of the CDI may occur:

• At the employer's initiative: dismissal (personal or economic), subject to contradictory procedure, motivated letter, notice period and statutory or contractual severance (article L. 1237-19 of the Labour Code)

• At the employee's initiative: resignation, without mandatory reason but respecting contractual notice period

• By mutual agreement: approved severance (articles L. 1237-11 to L. 1237-16 of the Labour Code), entitling the employee to unemployment insurance

Since the 2023 reform, collective severance is also extended to companies with fewer than 50 employees subject to conditions.

The statutory severance indemnity is due after 8 months' service (2017 Labour law reform), at the rate of 1/4 month's salary per year of service for the first 10 years, then 1/3 thereafter.

CDD termination: principle of stability and limited exceptions

The CDD is in principle stable: neither the employer nor the employee may terminate it before its term, except in cases exhaustively provided for by law (article L. 1243-1 of the Labour Code):

• Mutual agreement of both parties

• Serious misconduct by the employee or employer

• Force majeure

• Medical unfitness confirmed by the occupational health physician

• Hiring of the employee on a CDI by another employer

Any early termination outside these cases exposes the party responsible to heavy sanctions. If the employer terminates without just cause, they must pay compensation corresponding to salaries remaining due until the contract end date. If it is the employee, they are liable for the actual loss suffered by the employer.

End-of-contract indemnity: the "salary supplement" of the CDD

At the end of a CDD not renewed as a CDI, the employee receives an end-of-contract indemnity (also called "precariousness premium"), equal to 10% of the gross total remuneration received during the contract (article L. 1243-8 of the Labour Code). This indemnity is not due in case of seasonal CDD, CDD of custom, termination for serious misconduct, or if the employee refuses a CDI for the same position at the end of the CDD.

Digitalisation of these documents — settlement statements, receipts, amendments — is now facilitated by electronic signature platforms for companies, which enable archiving of each document with qualified time-stamping.

---

5. Portability of rights and CDI-CDD transition

Rights of the CDD employee: equal treatment

The principle of equal treatment between CDI and CDD employees is established by article L. 1242-14 of the Labour Code and reinforced by European Directive 1999/70/EC. A CDD employee must benefit from the same rights as CDI colleagues regarding: remuneration, access to professional training, collective facilities (staff restaurant, childcare), contractual benefits.

By contrast, they do not have access to the same termination protections and do not benefit from statutory dismissal severance.

Requalification as CDI: risks and recent case law

Requalification as a CDI constitutes the main litigation risk for employers. The Court of Cassation (notably Soc., 8 March 2023, n° 21-19.512) regularly reminds that abuse of successive CDDs for the same position, even respecting notice periods, may be sanctioned when it reveals a structural and permanent need. The Industrial Tribunal is competent to order requalification and associated compensation.

To minimise this risk, HR departments increasingly use digital contract management tools. The electronic signature ROI calculator from Certyneo allows in particular estimation of savings achieved by automating short-term contract management and reducing procedural errors.

Legal framework applicable to CDI and CDD contracts

Foundational texts of French employment law

The legal regime of CDI and CDD rests on a dense legislative foundation. Essential provisions appear in the Labour Code:

• Art. L. 1221-2: presumption of CDI for any employment contract without writing

• Art. L. 1242-1 to L. 1242-3: definition and authorised cases for CDD use

• Art. L. 1242-12: written requirement and mandatory CDD clauses

• Art. L. 1243-1: exhaustive cases for early CDD termination

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

• Art. L. 1244-3: notice period between successive CDDs

• Art. L. 1237-11 to L. 1237-16: approved CDI severance

Transposition of European Directives

Directive 2019/1152/EU of 20 June 2019 on transparent and predictable working conditions, transposed by ordinance n° 2023-1209 of 2 November 2023, strengthens employer information obligations: provision of a written document within 7 days, statement of maximum overtime hours, information on mandatory training. This directive applies to all contracts, CDI and CDD alike.

Directive 1999/70/EC on fixed-term work establishes the principle of non-discrimination between CDD and CDI employees and regulates abusive recourse to successive CDDs.

Electronic signature: legal value of digitalised contracts

Digitalisation of employment contracts is fully legal in France since the ordinance of 10 February 2016 and article 1366 of the Civil Code, which recognises electronic writing the same probative force as paper writing, provided the identity of its author is guaranteed and the document is preserved in conditions ensuring its integrity.

Article 1367 of the Civil Code recognises electronic signature as a method of validating a legal act provided it identifies the signatory and manifests their consent.

At European level, eIDAS Regulation n° 910/2014 (strengthened by eIDAS 2.0 progressively entering into force since 2024) distinguishes three levels of electronic signature:

• Simple (SES): sufficient for ordinary employment contracts

• Advanced (AES): recommended for sensitive clauses (non-compete, severance)

• Qualified (QES): highest level, legally equivalent to handwritten signature throughout the EU

For employment contracts, advanced electronic signature is generally recommended by legal doctrine and by the CNIL, which notes that GDPR n° 2016/679 requires minimising collection of signatories' personal data and documenting associated processing (records of processing activities, retention period).

Qualified trust service providers (within the meaning of eIDAS) guarantee compliance with standards ETSI EN 319 132 (XAdES), ETSI EN 319 122 (CAdES) and ETSI EN 319 162 (PAdES) for long-term archiving of signed documents.

Use scenarios: CDI, CDD and electronic signature in practice

Scenario 1 — A services SME managing recurring seasonal contracts

An SME in the professional events sector employs between 40 and 80 collaborators depending on season, with a monthly flow of 30 to 50 short-term CDDs (1 to 8 weeks). Previously, each contract was printed, manually signed, scanned and archived in physical folders. The average time between the hiring decision and handing over the signed contract exceeded 3 working days, exposing the company to requalification risk if handover occurred after the 2-day statutory deadline.

By deploying an electronic signature solution integrated with its HRIS, the SME reduces this timeframe to under 4 hours. The employee receives their contract by secure email, signs it from their smartphone with an advanced signature and retains a timestamped copy. The HR department benefits from complete traceability and automatic alerts on notice periods and expiry dates. Result: 70% reduction in HR administrative time on contract management and zero requalification as CDI during 2025.

Scenario 2 — A digital transformation consulting firm formalising CDI with executives

A consulting firm with about fifty consultants hires CDI executives with complex contracts: non-compete clause, confidentiality clause, international mobility clause. These 8 to 12-page documents previously required in-person signature on the first integration day, creating friction for remote or geographically mobile candidates.

By opting for qualified electronic signature (QES level), the firm secures these sensitive clauses legally whilst enabling new staff to sign remotely before taking up post. The offer acceptance rate rises by 12% according to the firm's own measurements, partly attributed to the fluidity of the digital integration process. Certified electronic archiving guarantees the probative value of each document throughout the prescription period (5 years after contract end).

Scenario 3 — A group of private clinics managing replacement CDDs

A group of private clinics (approximately 600 beds spread across several facilities) calls on replacement practitioners and nurses on CDD terms to cover unforeseen absences. The replacement reason must be expressly mentioned in the contract, with the name and qualification of the employee being replaced. Any omission or imprecision creates requalification risk.

Thanks to pre-filled and legally-validated CDD templates, combined with an eIDAS-compliant electronic signature solution, the group generates and sends a compliant contract in under 10 minutes, seven days a week. Internal audits reveal an 85% reduction in contractual non-compliance detected by the legal department. Estimated savings on employment tribunal litigation costs reach several tens of thousands of euros per year, according to figures observed in the private healthcare sector.

Conclusion

CDI and CDD follow fundamentally different legal logics: normal and general form for one, strictly regulated exception for the other. In 2026, mastering these distinctions — duration, grounds for use, written formalities, termination conditions, notice periods — is essential for any employer wishing to secure contractual relationships and avoid costly judicial requalifications.

Digitalisation of employment contracts, rendered fully legal by article 1366 of the Civil Code and eIDAS regulation, offers a concrete answer to HR departments' operational challenges: speed, traceability, compliance and probative archiving. Certyneo supports you in this transition with an eIDAS-compliant electronic signature solution, tailored to the specificities of CDI and CDD contracts.

Ready to secure and digitalise your employment contracts? Discover Certyneo's offers or calculate your return on investment in a few minutes.