Overtime: Growth and Legal Calculation

Introduction: An Unavoidable Reality for French Businesses

Overtime hours occupy an increasingly prominent place in work organisation in France. According to DARES data published in late 2025, the volume of declared overtime hours has grown by 12% over three years, driven by labour shortages in certain sectors and increased flexibility of contracts. For HR teams and SME leaders, mastering the legal calculation of overtime hours is a social, fiscal, and legal obligation. This article guides you through Labour Code rules, applicable increases, current exemptions, and best practices for document management — notably through electronic signature for HR — to secure every step of the process.

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The Fundamentals of Overtime in French Law

Definition and Trigger Threshold

In accordance with Article L3121-28 of the Labour Code, all hours worked beyond the legal weekly working duration of 35 hours are considered overtime. This rule applies to full-time employees on standard employment contracts. For employees subject to a forfeit day arrangement, the regime differs substantially.

The count is performed over the civil week (Monday 00:00 to Sunday 24:00), unless a collective agreement provides for another reference period. Where working time is annualised (company or industry agreement), overtime is calculated over the year, with the threshold set at 1,607 hours.

The Annual Overtime Contingent

Article L3121-33 of the Labour Code sets the legal annual contingent at 220 hours per employee per year, unless collective provisions are more favourable (some collective agreements reduce this contingent to 130 or 180 hours). Beyond the contingent, the employer must obtain the prior opinion of the Works Council (CSE) and the employee benefits from a mandatory rest compensation (COR).

In 2024, according to URSSAF, nearly 4.2 million private sector employees worked beyond the conventional contingent, representing an increase of 8 points compared to 2022.

Maximum Working Hours

The legislator strictly regulates overruns:

• Maximum daily duration: 10 hours (derogations possible up to 12 hours by agreement or labour inspectorate authorisation).

• Absolute maximum weekly duration: 48 hours over one isolated week.

• Average maximum weekly duration: 44 hours over 12 consecutive weeks.

Any unjustified overrun exposes the employer to criminal sanctions (class 5 offence, i.e. €1,500 per affected employee) and payment of damages in case of labour court litigation.

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Calculating Increases: Legal and Conventional Rates

Legal Increase Rates

Article L3121-36 of the Labour Code sets minimum rates of salary increase:

• 25% for the first 8 overtime hours (from the 36th to the 43rd hour inclusive).

• 50% from the 9th overtime hour onwards (from the 44th hour).

A company or industry agreement may provide for a lower increase rate, but never below 10% (legal minimum from the law of 20 August 2008).

Concrete Calculation Example:

An employee whose gross hourly salary is €18 works 42 hours in the week.

• Normal hours (35h): 35 × 18 = €630

• Overtime hours with 25% increase (7h): 7 × 18 × 1.25 = €157.50

• Weekly gross salary: €787.50

Replacement by Rest Compensation

The employer may, with collective agreement or failing that with employee agreement, replace all or part of overtime payment with equivalent rest compensation (RCE). This mechanism is particularly used in sectors with high seasonality (hospitality, catering, construction).

Since the social security financing law for 2024, the combination of rest compensation and tax exemption is only possible if the agreement is formalised in writing, reinforcing the importance of rigorous HR documentation.

Tax and Social Exemption: The "Tepa" Scheme

Arising from the TEPA law of 21 August 2007 and continued by the 2016 Labour Law, the exemption scheme remains in force in 2026:

• Income tax exemption within the limit of €7,500 per year of remuneration paid for overtime (Article 81 quater of the General Tax Code).

• Employee contribution reduction: flat-rate deduction of 11.31% on overtime remuneration (rate updated on 1 January 2026).

• Flat-rate employer deduction: applicable only in companies with fewer than 20 employees (€1.50 per overtime hour).

These tax advantages largely explain the growth in declared overtime use observed since 2018.

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Document Management of Overtime: Issues and Modernisation

Recording and Traceability Obligations

Article L3171-4 of the Labour Code requires the employer to keep a working time control document for each employee whose working time is not organised collectively. In case of litigation, the burden of proof lies with the employer: they must be able to produce signed hour statements or data extracted from the clocking system.

The Court of Cassation has confirmed on several occasions (Cass. Soc. 18 March 2020, n°18-10.919) that the absence of precise accounting places a presumption of unpaid overtime hours on the employer.

Electronic Signature Applied to HR Documents

The formalisation of overtime hours — whether amendments to employment contracts, recovery agreements, payslips, or hour statements — can now be based on electronic signature in the enterprise. This approach presents several advantages:

• Certified timestamping: each electronically signed document carries a probative time stamp, essential in case of dispute over the date of approval of hours.

• Complete traceability: the audit log retains the identity of the signatory, their IP address, the device used, and the hash of the original document.

• Reduced lead times: signing an amendment remotely takes on average 4 minutes compared to 3 to 5 days by post, according to sector benchmarks published by the National Digital Council (2025).

To learn more about the differences between signature levels (simple, advanced, qualified), consult our comprehensive guide to electronic signature.

Integration with Payroll and HRIS Software

Modernising overtime management also involves integrating signature solutions into HRIS (Silae, PayFit, Sage, ADP). Open APIs make it possible to automatically trigger a signature request as soon as an hour counter exceeds the legal threshold, guaranteeing compliance without manual intervention. Our ROI calculator allows you to assess the potential savings related to this automation in your structure.

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Trends 2025-2026: Why Overtime is Growing

Macro-economic and Sectoral Factors

Several dynamics explain the increase in declared overtime in France:

• Tension in the labour market: in logistics, healthcare, and IT sectors, the rate of vacant positions exceeds 5% (source: Pôle Emploi, 2025 assessment). Rather than recruiting, many SMEs prefer to use overtime, which they consider more flexible.

• Maintained tax advantage: the stability of the TEPA scheme since 2018 has established overtime as a variable remuneration lever, notably for workers and employees whose marginal tax rate is low.

• Tertiarisation and work hybridisation: remote work generates blurred boundaries between work time and personal time, leading to under-declaration or over-declaration depending on sectors, which complicates URSSAF controls.

Risk of Deviation and URSSAF Control

URSSAF adjustments related to overtime have increased by 18% between 2023 and 2025 (source: URSSAF annual report 2025). The most frequent grounds:

• Increases calculated on an incorrect hourly basis (exclusion of bonuses integrated into salary).

• Annual contingent exceeded without notification to the labour inspectorate.

• Exemptions incorrectly applied to hours not justified by signed statements.

Adopting an electronic signature solution compliant with eIDAS constitutes an effective safeguard against these risks, making documentary evidence unassailable.

Legislative Perspectives

The full employment bill, under discussion in Parliament in spring 2026, plans to experiment with an increase in the legal contingent to 270 hours in companies with fewer than 50 employees in strained sectors. If adopted, this measure will further accentuate the need for traceability and formalisation of individual agreements.

Legal Framework Applicable to Overtime

Founding Texts of Labour Law

The regulation of overtime in France is based on several legislative and regulatory texts that must be mastered:

• Articles L3121-28 to L3121-41 of the Labour Code: define legal duration, contingent, minimum increases, and methods of replacement by rest compensation.

• Article L3171-4 of the Labour Code: imposes the obligation of individual working time accounting.

• Article 81 quater of the General Tax Code: sets the tax exemption within the limit of €7,500 annually.

• Decree n°2008-1132 of 4 November 2008: clarifies the conditions for applying the flat-rate reduction in employer contributions.

Legal Value of Formalisation Documents

Any amendment, recovery agreement, or overtime hour statement constitutes a legal act capable of serving as evidence in court. Its evidential value depends on its integrity and the certain identification of the signatories.

The eIDAS Regulation n°910/2014 (and its eIDAS 2.0 revision in force since 2024) establishes three levels of electronic signature:

• Simple: sufficient for most routine HR documents.

• Advanced: recommended for salary amendments and recovery agreements, as it guarantees the identity of the signatory and the integrity of the document.

• Qualified: required for certain authentic acts; rarely required in routine labour law.

The Civil Code, articles 1366 and 1367, recognises the full evidential force of electronic writing when the person from whom it emanates can be duly identified and the integrity of the document is assured.

Personal Data Protection

Overtime hour statements contain personal data within the meaning of GDPR Regulation n°2016/679: name, employee identifier, actual working time. As such:

• The retention period must be defined (generally 5 years in labour law, the statute of limitations for labour disputes).

• Hosting must comply with data location requirements (EU servers or adequate country according to European Commission decision).

• Any electronic signature service provider processing this data is a controller within the meaning of Article 28 GDPR and must be subject to a DPA (Data Processing Agreement).

Legal Risks in Case of Non-Compliance

• URSSAF penalties: late payment increases of 5% + interest of 0.20% per month.

• Labour court litigation: judgment to pay unpaid hours + damages for concealed work (6 months minimum salary, Article L8223-1 of the Labour Code).

• Criminal sanctions: €1,500 fine per employee for failure to comply with maximum hours (class 5 offence).

Use Cases: Digitalising Overtime Management

Scenario 1 — An Industrial SME of 80 Employees in Production

An industrial SME employing 80 operators in 2×8 shifts must regularly activate overtime during order peaks. Previously, hour statements were printed, signed by hand by team leaders, and filed in physical folders. In case of URSSAF control, retrieving a document from 3 years earlier took on average 2 hours per file.

After deploying an electronic signature solution integrated with its payroll software, the company automatically generates a weekly statement per employee, sent for signature in less than 2 minutes. Documents are archived with certified timestamps and instantly retrievable. Result: 90% reduction in administrative processing time related to overtime and zero adjustments in the last two URSSAF controls, compared to a €12,000 adjustment found under the previous system.

Scenario 2 — A Group of Private Clinics with Around 400 Beds

A group of private clinics managing several facilities and approximately 400 beds faces strong constraints: high turnover of nursing staff, emergency schedule changes, and traceability requirements imposed by the national collective agreement for private hospital establishments. Schedule modification amendments had to be physically signed, creating delays incompatible with necessary responsiveness.

The adoption of an advanced electronic signature compliant with eIDAS now allows any amendment related to overtime to be formalised in less than 10 minutes, even for night shift staff or those at inter-site locations. The rate of documents signed within regulatory time limits increased from 64% to 98% in six months, eliminating risks of disputes over night and Sunday increases.

Scenario 3 — An Accounting Firm Managing 150 Payroll Files

An accounting firm processing payroll for 150 SME clients finds that seasonality (fiscal closures, year-end celebrations) generates a quarterly peak of overtime for its clients. These clients transmitted statements to it by unsecured email or post, leading to calculation errors and processing delays.

By integrating an electronic signature workflow into its service offering, the firm allows its clients to validate hour statements directly from their smartphone. Data is automatically imported into payroll software. Data entry errors fell by 35% and the average processing time for payslips including overtime was reduced from 4.5 days to 1.2 days, according to internal measurements over two consecutive financial years.

Conclusion

Overtime hours are both a performance lever for businesses and a minefield from legal and social perspectives. Mastering legal calculation, respecting contingents, correctly applying increases and tax exemptions, and above all formalising each agreement in writing are the sine qua non conditions for compliant and smooth management.

Digitalising these processes — notably through electronic signature — is no longer optional but a necessity for HR teams facing growing volumes of documents with probative value. It reduces costs, accelerates timelines, and secures each document against potential control or litigation.

Certyneo supports you in this transformation with an eIDAS-compliant electronic signature solution, designed for HR teams and accountants. Discover our offers and start for free today.