Overtime Hours: Supplement and Legal Calculation

Introduction: why the calculation of overtime hours remains a major issue

In France, overtime hours constitute one of the most contentious labour law subjects for both employers and employees. According to data from DARES published in 2025, more than 9 million private sector employees perform hours beyond the legal working duration set at 35 hours per week by law no. 2000-37 of 19 January 2000. Yet, the rules for calculating the supplement, the triggering thresholds and documentary obligations remain poorly understood by many HR teams and legal departments. This article provides you with a comprehensive and up-to-date guide for 2026: legal definition, method of calculating the supplement, annual quota, recovery and documentary obligations — incorporating the latest legislative and contractual developments.

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1. Definition and triggering threshold for overtime hours

1.1 Legal working duration as reference

Overtime hours are all hours of actual work performed beyond the legal weekly duration of 35 hours (or the equivalent duration if a working time arrangement scheme is in place). This definition, established by article L. 3121-28 of the Labour Code, applies to employees under the hourly regime. It excludes by principle senior managers on daily-rate contracts, whose regime is governed by specific rules provided in articles L. 3121-58 and following.

For a part-time employee, hours worked beyond their contractual duration are classified as supplementary hours (and not overtime), with a distinct enhancement regime.

1.2 Weekly counting as the rule of principle

The count operates week by week, the civil week being understood as Monday 0 hours to Sunday 24 hours (art. L. 3121-29 C. lab.), unless a company agreement provides for another reference period. In companies that have opted for a working time arrangement over a period longer than the week (annualisation), overtime hours are calculated at the end of the reference period, by subtracting the volume of hours worked from the applicable contractual threshold.

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2. Enhancement rates: calculating the legal and contractual supplement

2.1 Legal enhancement rates

Article L. 3121-36 of the Labour Code sets minimum rates for overtime hour enhancement:

• 25% for the first 8 overtime hours of the week (i.e., hours 36 to 43 inclusive);

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

These rates are legal minima. A sectoral agreement, company agreement or establishment agreement may provide for higher rates. Conversely, since the El Khomri Act of 8 August 2016, a company agreement may lower the enhancement rate to a minimum threshold of 10%, provided that no sectoral agreement explicitly opposes this.

Concrete calculation example: An employee whose gross hourly rate is €15 performs 10 overtime hours during the week.

• The first 8 hours: 8 × €15 × 1.25 = €150

• The next 2 hours: 2 × €15 × 1.50 = €45

• Total supplement: €195 (compared to €150 without enhancement)

2.2 The question of the reference hourly rate

The reference hourly rate serving as the basis for calculation must include all remuneration elements that have the character of salary and are paid in direct consideration for work. The Court of Cassation has regularly reminded (notably Cass. soc., 23 November 2022, no. 21-11.776) that bonuses not linked to the quality or quantity of work are not included in this base, unlike seniority or performance bonuses.

2.3 Replacement of payment with compensatory rest

Instead of enhanced payment, a collective agreement may provide that payment of overtime hours and their enhancement is replaced in whole or in part by equivalent compensatory rest (art. L. 3121-33 C. lab.). This rest, called "replacement compensatory rest" (RCR), is not deducted from the annual overtime quota.

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3. The annual overtime quota

3.1 The legal reference volume

In the absence of a collective agreement, the annual overtime quota is set at 220 hours per employee (art. D. 3121-24 C. lab.). This ceiling may be modified — upwards or downwards — by extended sectoral agreement or company agreement. Certain professional sectors, notably in construction or catering, have distinct contractual quotas, sometimes set at 360 annual hours.

3.2 Overtime hours outside the quota

Hours worked beyond the quota are not prohibited, but are subject to a dual obligation:

• Prior consultation with the social and economic committee (CSE), in accordance with article L. 3121-33;

• Mandatory compensatory rest (COR) at 100% of the overtime worked outside the quota (art. L. 3121-38), without prejudice to salary enhancement.

Non-compliance with these rules exposes the employer to significant risks of employment tribunal litigation and criminal sanctions provided in article R. 3124-2 of the Labour Code (class 5 fine, up to €1,500 per offence, increased to €3,000 in case of reoffence).

3.3 Counting and monitoring: the documentary obligation

The employer is required to establish an objective, reliable and accessible system for recording working time for each employee, in accordance with the case law of the Court of Justice of the European Union (CJEU, 14 May 2019, case C-55/18, CCOO v Deutsche Bank). In France, this obligation has been transposed into the inspection practices of the DREETS. The time register or management software must allow working hours to be reconstructed week by week and overtime hours to be identified.

This is precisely where solutions such as electronic signature for HR teams take on their full value: they make it possible to formalise and archive amendments to employment contracts, recovery agreements or compensatory rest claim forms with enhanced evidential value.

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4. Tax and social exemptions: the updated "Tepa" scheme

4.1 Income tax exemption

Since the TEPA Act of 21 August 2007, renewed and amended by the Act of 16 August 2022, remuneration paid for overtime hours and supplementary hours is exempt from income tax up to €7,500 per year (ceiling applicable from 1 January 2023, art. 81 quater of the General Tax Code). This exemption applies to private sector employees as well as certain public servants.

4.2 Reduction in employee contributions

In parallel, overtime hours open the right to a flat-rate reduction in employee contributions set by regulation. In 2026, this reduction is 11.31% of the gross remuneration for the hours concerned for employees under the general scheme. It applies within the limit of the amount of contributions and deductions of legal or contractual origin owed by the employee.

The employer benefits in turn from an employer flat-rate deduction of €0.50 per overtime hour in companies with fewer than 20 employees (art. L. 241-18 of the Social Security Code), an advantage not to be overlooked in calculating the real cost of resorting to overtime.

4.3 Eligibility conditions and pitfalls to avoid

To benefit from these exemptions, hours must be actually worked and the enhancement must be paid in accordance with legal or contractual rules. Overtime hours recovered in the form of replacement compensatory rest do not open the right to tax and social exemptions (BOFiP, BOI-RSA-CHAMP-20-50-40, § 210). The distinction between payment and recovery is therefore strategically important for payroll optimisation.

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5. Formalisation and evidence: best documentary practices in 2026

5.1 Individual or collective agreement as foundation

To request overtime hours, the employer has no obligation to obtain the prior agreement of the employee for hours within the quota: it is a management power. However, any amendment modifying the contractual working duration or establishing a flat rate must be the subject of a signed written agreement. This is where electronic signature compliant with the eIDAS regulation provides essential legal certainty, particularly for employers managing multiple sites or remote working teams.

5.2 The payslip as the key document

Overtime hours must compulsorily appear on the payslip with distinct mention of the number of hours worked and the enhancement rate applied (art. D. 3243-2 C. lab.). In case of URSSAF audit or employment tribunal dispute, the payslip is the first document examined. A discrepancy between the time register and the payslip is systematically interpreted in favour of the employee by the employment tribunals.

5.3 Dematerialisation and secure archiving

In a context of increasing dematerialisation of HR processes, electronic archiving of documents relating to working time — timesheets, contingent notifications, recovery agreements — must meet the security and integrity standards required by regulations. Using a comprehensive guide to electronic signature will allow you to structure your documentary compliance approach end-to-end. To assess the return on investment of such a dematerialisation approach, Certyneo's electronic signature ROI calculator offers a personalised projection in minutes.

Finally, it should be noted that documents relating to working duration must be retained for 5 years from their date of establishment (art. L. 3171-3 C. lab.), a constraint that argues for a digital archiving solution with probative value rather than paper.

Legal framework applicable to overtime hours

Foundational texts of French labour law

The legal regime of overtime hours is mainly governed by articles L. 3121-28 to L. 3121-48 and D. 3121-24 of the Labour Code (consolidated version in force as of 1 January 2026). These provisions distinguish the common law regime (companies without a collective agreement) from the derogating regime negotiated by sectoral or company agreement, in accordance with the three-tier architecture established by the Macron ordinances of 22 September 2017 (ordinances no. 2017-1385 to 2017-1388).

Article L. 3121-36 sets the legal minimum enhancement rates (25% and 50%). Article L. 3121-33 governs the conditions for implementing replacement compensatory rest. Article L. 3121-38 defines the mandatory compensatory rest for hours outside the quota.

Key case law

The CJEU, 14 May 2019, case C-55/18 (Federación de Servicios de Comisiones Obreras v Deutsche Bank SAE) established the obligation for Member States to put in place an objective and reliable system enabling the measurement of daily working time duration for each worker. This decision, transposed into the inspection practices of the French labour inspectorate (DGT circular 2022-01), strengthens employers' documentary traceability obligations.

The Court of Cassation has further clarified (Cass. soc., 18 March 2020, no. 18-10.919) that the burden of proof of overtime hours is shared: the employee must provide sufficiently precise elements as to the hours worked, and the employer must in response produce its own monitoring elements.

Tax and social obligations

The income tax exemption is codified in article 81 quater of the General Tax Code, amended by law no. 2022-1158 of 16 August 2022 introducing emergency measures for consumer protection. The employer deduction is provided in article L. 241-18 of the Social Security Code. The declarative procedures are detailed in URSSAF instructions and BOSS documentation (Official Bulletin of Social Security, "Overtime and supplementary hours" section, updated January 2026).

Sanctions and litigation risks

Non-compliance with overtime hour rules exposes the employer to several cumulative risks: wage recovery with legal interest, damages for undeclared work (art. L. 8221-5 C. lab.), URSSAF recovery on evaded contributions, and criminal fine (art. R. 3124-2 C. lab.). In case of characterised undeclared work, sanctions may reach 3 years' imprisonment and €45,000 fine (art. L. 8224-1 C. lab.).

Usage scenarios: documentary management of overtime hours

Scenario 1 — An industrial SME with 80 employees on shift work

An industrial SME employing approximately eighty employees distributed across three shift teams (morning, afternoon, night) must manage dozens of amendments each month linked to exceeding the contractual quota, as well as forms for choosing between enhanced payment and replacement compensatory rest. Before dematerialisation, paper processing of these documents generated signature delays of 5 to 10 days (travel between sites, loss of internal mail) and filing errors affecting the company's defence during URSSAF audits.

By deploying a qualified electronic signature solution compliant with eIDAS for formalising these HR documents, the SME reduced signature delays to less than 24 hours and eliminated risks of document loss. According to sectoral benchmarks from ANDRH (2024), this type of approach reduces administrative processing time for working time management documents by 60 to 75%.

Scenario 2 — A franchise network in fast food catering

A fast food franchise network comprising around thirty outlets and approximately 400 employees on fixed-term and open-ended contracts faces high volumes of overtime hours during peak periods (school holidays, local events). The complexity lies in the multiplicity of collective agreements applicable depending on sites and the need to quickly notify the concerned employees of their compensatory rest rights.

The integration of an electronic signature module into the franchise network's HR information system enabled automation of compensatory rest rights notifications (art. D. 3121-18 C. lab.) and collection of signed acknowledgements of receipt. URSSAF data shows that franchise networks that have dematerialised this process reduce employment tribunal disputes related to the contestation of overtime hour counts by 40% on average, due to lack of sufficient documentary evidence on the employer's side.

Scenario 3 — An accounting firm managing payroll for its small business clients

An accounting firm of twenty or so employees manages the payroll of approximately 150 small business clients. For each client, it must formalise quota amendments, modulation agreements and TEPA exemption documents sent to URSSAF. Multi-client management made paper tracking untenable: risks of file confusion, validation delays and lack of clear audit trail.

By adopting a multi-mandate electronic signature platform, the firm was able to centralise all documentary flows related to overtime hours for its clients, with time-stamped traceability by file. According to feedback published by the OEC (Ordre des Experts-Comptables, digital report 2025), this type of deployment generates a productivity gain of approximately 3 to 5 hours per week per payroll manager, representing savings estimated at €8,000-12,000 per year for a firm of this size.

Conclusion

The legal calculation of overtime hours in 2026 rests on a series of legal, contractual and case law rules that neither HR teams nor legal departments can afford to ignore. Enhancement rates, annual quota, mandatory compensatory rest, TEPA exemptions and documentary obligations constitute as many vigilance points liable to generate costly litigation in case of error or evidentiary gap.

Rigorously formalising your HR documents relating to working time — amendments, recovery agreements, compensatory rest notifications — with an electronic signature solution compliant with eIDAS is today the best legal and operational guarantee. Certyneo offers you a secure, compliant and simple-to-deploy platform for all your teams.

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