Overtime Hours: Legal Increases and Calculation

Introduction

Overtime hours are one of the most closely scrutinised subjects by both employers and employees. Between the legal increase rates, the rules of the annual contingent, the tax and social exemptions arising from successive laws, and documentary obligations, the system is complex. A calculation error or a lack of collective agreement can expose the company to URSSAF adjustments, or even costly employment tribunal disputes. This article provides an overview of the entire framework applicable in 2026: definition, calculation of the increase, annual contingent, exemption regime and best practices for securing the management of these hours in your organisation.

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Definition and Calculation of Overtime Hours

What is an Overtime Hour?

An overtime hour is any hour of effective work accomplished beyond the statutory weekly duration set at 35 hours (article L. 3121-28 of the French Labour Code). This definition applies to full-time employees subject to hourly calculation. It does not, in principle, concern managers on a daily-based forfeit system, except for specific contractual clauses.

Caution: only hours actually ordered or accepted by the employer are included in the calculation. An hour worked spontaneously by the employee without prior authorisation does not automatically generate an increase, although proof of the reality of the work is sufficient in the event of a dispute (Cass. soc., 2 June 2010, no. 08-40.628).

Effective Working Time: Exclusions to Know

Effective working time (EWT) is defined in article L. 3121-1 of the French Labour Code as "the time during which the employee is at the disposal of the employer and complies with its instructions without being able to freely attend to personal matters". This excludes: break times, commuting times (except on-call duty) and dressing periods not taken into account by agreement. Only EWT serves as the basis for calculating overtime hours.

Reference Period: Week or Adjustment?

Under common law, the calendar week (Monday 0 am to Sunday 11:59 pm) serves as the reference. However, a company or sectoral agreement may establish a working time adjustment over a period longer than one week (up to one year: article L. 3121-44). In this case, overtime hours are calculated at the end of the period, which changes the payment time and contingent calculations.

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Legal and Conventional Increase Rates

Legal Reference Rates

Article L. 3121-36 of the French Labour Code sets the following minimum rates:

• 25 % increase for the first 8 overtime hours of the week (from the 36th to 43rd hour inclusive);

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

These rates apply to the base hourly salary, that is, the usual gross salary divided by the contractual duration. It must include remuneration elements with the character of salary and paid in direct consideration of the work (bonuses included if they are part of it, according to consistent case law of the social chamber).

Concrete Calculation Example

An employee receives a monthly gross salary of €2,100 for 35 hours per week (151.67 monthly hours). Their base hourly rate is therefore: 2,100 / 151.67 = €13.84 gross/hour.

They work 5 overtime hours during the week (36th to 40th hour):

• 25% increase: 13.84 × 1.25 = €17.30/hour

• Total for 5 hours: 5 × 17.30 = €86.50 additional gross

If 3 overtime hours are worked from the 44th hour:

• 50% increase: 13.84 × 1.50 = €20.76/hour

• Total for 3 hours: 3 × 20.76 = €62.28 additional gross

Adjustment by Collective Agreement

A sectoral or company agreement may derogate from legal rates, provided it does not fall below 10 % increase (article L. 3121-33). It may also provide for the replacement of all or part of the paid increase with compensatory rest leave (CRL), neutral for the company's cash flow but subject to strict rules for triggering and taking.

To learn more about formalising these agreements and signing salary amendments, the electronic signature solution for HR offered by Certyneo allows you to dematerialise all these documents in full compliance.

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The Annual Contingent of Overtime Hours

Legal and Conventional Volume

The annual contingent is the volume of overtime hours an employer can have performed by an employee without prior authorisation from the labour inspectorate. In the absence of a collective agreement, it is set by decree at 220 hours per year per employee (decree no. 2002-622 of 25 April 2002, codified in article D. 3121-24).

A company or sectoral agreement may:

• Reduce this contingent below 220 hours;

• Increase this contingent above 220 hours (with no explicit legal ceiling, subject to compliance with absolute maximum durations).

Absolute Maximum Durations: Legal Safeguards

Even beyond the contingent, absolute ceilings apply:

• 10 hours of effective work per day (article L. 3121-18);

• 48 hours of effective work per week (article L. 3121-20);

• 44 hours on average over 12 consecutive weeks (article L. 3121-22);

• 11 hours of mandatory daily rest (article L. 3131-1).

These limits are of absolute public order: no collective agreement may derogate from them, except in exceptional circumstances governed by ministerial decree.

Beyond the Contingent: Mandatory Compensatory Rest (MCR)

When overtime hours exceed the annual contingent (conventional or legal), each hour worked beyond opens the right to mandatory compensatory rest (MCR). Its rate is:

• 50 % in companies with 20 or fewer employees;

• 100 % in companies with more than 20 employees.

This rest is separate from CRL and must be taken within two months following the opening of the right. The employer is required to inform the employee of the number of rest hours acquired via the pay slip.

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Tax and Social Exemptions: The "Macron Labour" Scheme

Income Tax Exemption

Since the TEPA law of 21 August 2007 (partially repealed, then reinstated by the law of 16 August 2022 called "purchasing power protection"), remuneration paid for overtime hours is exempt from income tax within the limit of €7,500 per year (ceiling applicable for 2026 income, subject to the budget law).

This exemption benefits all private sector employees, public servants and employees in the agricultural professions.

Reduction in Employee Social Contributions

Overtime hours also benefit from a flat deduction in employee social contributions set at 11.31 % (2026 rate according to the annual order of the social security directorate). This rate applies to the remuneration of overtime hours (including increase), which significantly improves the net amount received by the employee.

Flat Employer Deduction

Employers with fewer than 20 employees benefit from a flat deduction in employer social contributions of €1.50 per overtime hour worked (article L. 241-18 of the Social Security Code). Beyond 20 employees, this deduction has been eliminated since 2012.

To optimise the monitoring of these exemptions and guarantee the traceability of agreements, many companies rely on a comprehensive guide to electronic signature to dematerialise amendments and working time calculation documents.

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Calculation, Payment and Traceability Obligations

The Pay Slip: Mandatory Entries

Each overtime hour must appear on the pay slip, with separate mention of the number of hours, the applicable increase rate and the corresponding gross amount. This obligation is set out in article R. 3243-1 of the French Labour Code and reinforced by the order of 25 February 2016 on the simplified pay slip.

The absence of separate calculation can be taken as evidence of concealment of salaried employment (article L. 8221-5), with associated criminal and civil penalties.

Working Time Calculation Documents

The employer is required to implement a reliable system for calculating working time for each employee not subject to a daily-based forfeit system (CJEU, 14 May 2019, case C-55/18, CCOO v Deutsche Bank). This system must be objective, accessible and kept for 3 years (article D. 3171-16).

The use of a digital time management tool is strongly recommended. Agreements to implement such tools, as well as usage policies, can be signed electronically via an eIDAS-compliant platform — to be explored via our comparison of electronic signature solutions.

Limitation and Disputes

The period of limitation for claiming payment of overtime hours is 3 years from the date on which the rights holder knew or should have known the facts allowing them to pursue their action (article L. 3245-1). This period runs from the date the pay slip is given. In the case of deliberate concealment, the period may be extended to 5 years (article 2224 of the Civil Code).

Companies that digitise their HR documents with an electronic signature compliant with European standards have timestamped and tamper-proof evidence, invaluable in the event of a dispute.

Legal Framework Applicable to Overtime Hours

The regulation of overtime hours is part of a stratified legislative and regulatory framework that must be mastered to avoid any risk of reclassification or audit.

French Labour Code — Fundamental Provisions:

• Article L. 3121-28: defines overtime hours as any hour worked beyond 35 weekly hours.

• Articles L. 3121-33 to L. 3121-36: set the increase rates (25 % and 50 %) and provide the conditions for derogation by collective agreement (floor of 10 %).

• Articles L. 3121-44 to L. 3121-47: govern the adjustment of working time over a period longer than one week and the calculation of resulting overtime hours.

• Article D. 3121-24: sets the legal contingent at 220 hours per year in the absence of a collective agreement.

• Articles L. 3121-28 to L. 3121-30: absolute maximum durations (daily, weekly, average over 12 weeks).

• Article L. 3245-1: 3-year limitation for actions for payment of salaries, including overtime hours.

• Articles L. 3171-1 and D. 3171-16: obligations to calculate and retain working time documents for 3 years.

Social Security Code:

• Article L. 241-18: flat employer deduction of €1.50 per overtime hour for companies with fewer than 20 employees.

• Article L. 241-17: reduction in employee social contributions applicable to overtime remuneration.

Tax Law:

• Article 81 quater of the French General Tax Code: exemption from income tax on overtime remuneration within the limit of €7,500 per year, resulting from law no. 2022-1158 of 16 August 2022 establishing emergency measures to protect purchasing power.

Case Law and European Law:

• CJEU, 14 May 2019, case C-55/18 (CCOO v Deutsche Bank): member states must require employers to implement an objective, reliable and accessible system to measure the duration of daily working time for each employee.

• Cass. soc., 18 March 2020, no. 18-10.919: the burden of proof for overtime hours is shared between the employee (who must provide sufficiently precise evidence) and the employer (who must justify the actual working hours).

Non-Compliance Risks: Non-payment or underpayment of overtime hours exposes the employer to an URSSAF audit (back payment of contributions, increases of 5 % to 10 %), damages in an employment tribunal, or even criminal prosecution for concealed employment (article L. 8221-5: fine up to €45,000 and 3 years' imprisonment for individuals). Maintaining a reliable calculation system and secured dematerialisation of agreements are the first lines of defence.

Use Scenarios: Managing Overtime with Electronic Signature

Scenario 1 — An Industrial SME with 60 Employees During Peak Season

An SME in the manufacturing sector employs 60 production operators. Each quarter, increased activity generates an average of 8 to 12 overtime hours per week per employee for 6 weeks. The company previously had to print, have physically signed and archive amendments regarding contingent overruns and compensatory rest leave agreements. This process took 3 to 4 working days between drafting and collecting all signatures.

By deploying an electronic signature solution compliant with eIDAS advanced level, the company reduces this timeframe to less than 4 hours: the amendment is generated from a pre-configured template, sent via SMS/email notification, signed from the employee's smartphone and automatically archived with qualified timestamp. Operating gains documented in similar contexts range between 60 and 80 % reduction in signature cycle time, according to sector studies published by the French Federation of Industries.

Scenario 2 — An Accountancy Firm Managing Payroll for SMEs

An accountancy firm managing payroll for 150 SME clients must each month validate overtime calculation, inform them of exemption thresholds reached and have the business owner validate variable pay elements before processing. Exchanges via unsecured email exposed the firm to risks of later dispute over transmitted data.

Thanks to a dematerialised validation flow with simple electronic signature integrated into its payroll software, the firm obtains timestamped legal proof of client agreement on each variable slip. In case of dispute, traceability is complete. The firm reports approximately 40 % reduction in monthly administrative management time related to validations, consistent with benchmarks in the accountancy sector (IFEC report 2024).

Scenario 3 — A Retail Distribution Network with Atypical Hours

A retail chain with around twenty stores manages variable schedules regularly integrating overtime on weekends and evenings. The HR manager had to centralise paper timesheets from each store, manually recalculate increases and notify employees. The process was a source of recurring errors and delays.

Integration of an automated calculation tool coupled with an electronic signature dedicated to HR teams made it possible to reliabilise the calculation of increases (25 % and 50 %) in real time, automatically send validated summary slips via electronic signature and create a legal archive compliant with article D. 3171-16. The chain estimates it has reduced employment tribunal disputes related to overtime hours by more than 70 % over two consecutive financial years, in line with documented experience feedback in the retail sector.

Conclusion

Overtime hours are subject to a precise legal framework that every employer must master: 25 % and 50 % increase rates, 220-hour annual contingent, capped tax and social exemptions, and strict calculation and traceability obligations. Poor management of these elements exposes the company to URSSAF audits, employment tribunal disputes and criminal penalties for concealed employment.

Dematerialisation of HR documents related to overtime hours — amendments, compensatory rest leave agreements, variable pay slips — is today the best way to secure evidence and accelerate processes. Certyneo supports you in this approach with an eIDAS-compliant electronic signature platform, simple to integrate and adapted to HR teams of all sizes.

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