Overtime: supplements and legal calculation

Overtime represents one of the most sensitive topics in French labour law. Between the legal increase rates, the possibilities for arrangements through collective agreements and the declarative obligations placed on the employer, the regulatory framework is dense and evolving. Poor management exposes the company to URSSAF adjustments, salary back payments and labour court sanctions. This article methodically details the legal definition, the rules for calculating supplements, the annual contingent regime and best practices for securing your working time management. Whether you are an HR manager, payroll administrator or SME director, you will find here the concrete answers you are looking for.

Legal definition of overtime

What the Labour Code says

In accordance with Article L3121-28 of the Labour Code, overtime constitutes all hours of work performed beyond the legal weekly duration, set at 35 hours for almost all full-time employees. The count is carried out over the calendar week, i.e. from Monday 0 a.m. to Sunday 24 p.m., unless a company agreement sets another reference period (Article L3121-32).

It is important to distinguish overtime from complementary hours, which exclusively concern part-time employees. These are governed by a separate regime (Article L3123-8 et seq.) and are not covered in this article.

Employees concerned and exclusions

The legal regime of 35 hours applies to employees subject to a working time measured in hours. Excluded are:

• Senior managers (Article L3111-2), who are subject neither to the legal duration nor to the provisions on overtime;

• Employees on annual forfeit in days (Article L3121-58), who are measured in days and half-days;

• Home workers and certain particular categories defined by decree.

For employees on annual hours forfeit, the threshold for triggering overtime is set contractually, within the limits provided by the sector or company agreement.

Increase rates: applicable rules

The legal reference scale

In the absence of a more favourable collective agreement, Article L3121-36 of the Labour Code sets the following minimum increases:

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

• 50% for subsequent hours (from the 44th hour onwards).

These rates apply to the basic hourly wage, to which are added salary supplements that have the character of wages according to the case law of the Court of Cassation (performance bonuses, commissions, etc.).

Concrete calculation example: An employee whose basic salary is €2,000 gross for 151.67 hours per month (i.e. 35 hours/week) receives an hourly rate of €13.19. If they work 5 overtime hours in the week, the remuneration for these hours will be:

• 5 × €13.19 × 1.25 = €82.44 gross

The ability to negotiate through collective agreement

Article L3121-33 opens the possibility for a sector or company agreement to modify the increase rate, provided it does not fall below 10%. This possibility, introduced by the 2017 Labour Ordinances, has been widely used in labour-intensive sectors (hotel and catering, construction, transport).

An agreement may also replace all or part of the increased payment with a replacement compensatory rest (RCR), in accordance with Article L3121-37. In this case, the employee receives rest equal to the time worked increased by the corresponding increase rate.

Social and tax exemption: the Fillon-Macron scheme

Since the 2007 TEPA law, reinforced by the 2018 "Future Careers" law, overtime benefits from a flat-rate deduction of employer contributions and a reduction in income tax for the employee, within a limit of €7,500 net per year. This tax exemption is a concrete advantage for the employee and a competitiveness lever for the employer, provided that the hours are properly declared in DSN (Nominative Social Declaration).

For companies with fewer than 20 employees, an employer flat-rate deduction of €1.50 per overtime hour applies (€0.50 for companies with 20 or more employees), subject to compliance with the European de minimis threshold.

The annual overtime contingent

Setting and exceeding the contingent

The annual contingent represents the volume of overtime an employer can have an employee perform 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 (Article D3121-24).

A sector or company agreement may modify this volume upwards or downwards (Article L3121-33). Certain sectors have thus negotiated significantly higher contingents (up to 405 hours in the hotel-café-restaurant sector before the health crisis).

Mandatory compensatory rest (COR)

Once the employee exceeds the annual contingent, each overtime hour gives rise to a mandatory compensatory rest (COR), distinct from replacement compensatory rest. In the absence of a collective agreement, this compensation is set at:

• 50% of the hours performed beyond the contingent in companies with 20 employees or fewer;

• 100% in companies with more than 20 employees.

The COR must be taken within two months following the opening of the right. The employer's failure to inform the employee of their rest rights constitutes an employer fault that may be sanctioned.

Absolute maximum durations

Regardless of the contingent, the employer can never exceed the maximum working times provided for in Articles L3121-18 to L3121-21:

• 10 hours per day (possible waiver up to 12 hours by collective agreement or labour inspectorate authorisation);

• 48 hours per week in absolute value;

• 44 hours on average over 12 consecutive weeks.

These ceilings are of public order and cannot be circumvented by collective agreement.

Employer obligations in monitoring

Time recording and tracking

The employer is required to put in place a reliable and objective system for recording effective working time, in accordance with constant case law of the Court of Cassation and the CJEU judgment of 14 May 2019 (case C-55/18, CCOO v Deutsche Bank). This monitoring can take the form of a clocking software, a weekly tracking table countersigned, or any other traceable mechanism.

The absence of a control system exposes the employer to a presumption of overtime in case of labour court dispute: the employee can merely produce elements likely to support their claim, the employer then having to prove the hours actually worked.

The electronic signature solution for HR offered by Certyneo allows in particular to dematerialise amendments to the employment contract fixing recurring overtime, thereby guaranteeing irreproachable legal traceability.

Information and payslips

Each overtime hour must appear separately on the payslip, with the increase rate applied, the number of hours concerned and, where applicable, acquired rest rights. This obligation stems from Article R3243-1 of the Labour Code.

In the event that payment is replaced by compensatory rest, the employer must provide the employee with a monthly document attached to the payslip specifying the number of rest hours acquired, the number of hours taken and the available balance.

Sanctions for non-compliance

Breaches of overtime rules may give rise to several types of liability:

• 4th class misdemeanour (€750 per affected employee) for exceeding the contingent without notifying the labour inspector;

• Back salary payment plus default interest before the Labour Court;

• URSSAF adjustment with application of a multiplying coefficient to evaded contributions;

• In serious cases, requalification as concealed work (Article L8221-5), resulting in an indemnity of 6 months' salary.

Companies that streamline their document management through the complete guide to electronic signature available on Certyneo significantly reduce the risk of disputes related to the traceability of overtime agreements.

Working time arrangements and overtime

Annualised working time

Article L3121-44 authorises a collective agreement to organise working time over a period longer than a week and at most equal to a year. In this context, overtime is calculated not per week but at the end of the reference period, on the basis of an annual threshold of 1,607 hours (solidarity day included).

This arrangement is particularly widespread in sectors with seasonal activity (tourism, agriculture, retail) and makes it possible to smooth out activity variations without systematically generating overtime during peaks.

Hourly or monthly forfeit

Distinct from annual day forfeit, hours forfeit consists of contractually agreeing on a working duration exceeding 35 hours (e.g. 39 hours/week), including a fixed volume of overtime. These hours are then paid with their increase from hire, without triggering a posteriori.

To guarantee the validity of such a forfeit, the electronic signature in the company of contractual amendments is increasingly becoming standard practice, making it possible to retain evidence that can be opposed to the employee's agreement.

Part-time work and supplementary hours: do not confuse

As a reminder, part-time employees can only work complementary hours beyond 10% of the contractual duration (or 33% if a sector agreement authorises it), and these hours do not give rise to the same increases as overtime. The applicable rate is 10% for hours within the tenth, and 25% beyond.

Efficient management of documents related to working time arrangements can be greatly simplified by the use of the AI contract generator from Certyneo, which integrates up-to-date legal clauses for the different types of forfeits.

Legal framework applicable to overtime

French regulations on overtime are part of a layered legislative and regulatory corpus, combining national law and Union law.

Labour Code (legislative part):

• Article L3121-28: definition of overtime as hours worked beyond 35 hours/week;

• Articles L3121-33 to L3121-40: regime of increases, compensatory rest and possibilities for arrangement by agreement;

• Articles L3121-41 to L3121-47: modulation and annualisation of working time;

• Article L3121-36: legal increase rates (25% and 50%);

• Articles L3121-18 to L3121-21: absolute maximum working times.

Labour Code (regulatory part):

• Article D3121-24: setting of the annual contingent at 220 hours in the absence of a collective agreement;

• Article R3243-1: mandatory payslip references relating to overtime.

European Directive 2003/88/EC concerning certain aspects of working time arrangements: it requires Member States to ensure maximum limits on weekly working time (48 hours on average) and minimum rest periods (11 consecutive hours daily and 24 hours weekly). Its transposition into French law is ensured by the aforementioned articles of the Labour Code.

CJEU judgment C-55/18 (14 May 2019), CCOO v Deutsche Bank: the Court of Justice of the European Union ruled that Member States must impose on employers the implementation of an objective, reliable and accessible system allowing to measure the daily working time duration of each worker. This decision has a direct impact on the burden of proof obligations of French employers regarding the monitoring of overtime.

Law No. 2007-1223 of 21 August 2007 (TEPA law): establishment of the social and tax exemption regime for overtime, reaffirmed and expanded by law No. 2018-771 of 5 September 2018.

Macron Ordinances No. 2017-1385 and 2017-1387 of 22 September 2017: reinforcement of the primacy of the company agreement over the sector agreement for the methods of application of overtime (increase rate, contingent, compensatory rest).

Key legal risks: any employer who fails to pay overtime is exposed to back pay over three years (Article L3245-1 of the Labour Code), URSSAF adjustments and, in case of deliberate concealment, a qualification of concealed work (Article L8221-5), punishable by 3 years' imprisonment and €45,000 fine for natural persons.

Concrete usage scenarios

An industrial SME of 45 employees facing a production peak

An industrial SME specialising in mechanical subcontracting experiences quarterly peaks in orders requiring 6 to 8 hours of overtime per week per operator for 6 to 8 consecutive weeks. Without a structured monitoring system, the company accumulated calculation errors on increases (25% vs 50%) and omissions of mention on payslips, generating recurring labour court claims.

By deploying a time tracking tool integrated into its payroll software, coupled with an electronic signature solution for weekly contractual amendments, the HR management reduced by 70% the administrative processing time linked to overtime and eliminated disputes over the calculation of increases. The cost of labour court management (lawyer fees, HR hours used) fell by around €15,000 over two consecutive financial years, according to internal estimates.

A consulting firm with 12 consultants

In a consulting firm, senior consultants regularly work between 42 and 46 hours per week during intensive mission periods. The company had opted for an hours forfeit agreement at 39 hours including 4 overtime hours increased by 25%, but amendments were not systematically signed before taking up their position.

By adopting an electronic signature process for all HR contractual documents, the firm was able to establish evidence that could be relied upon of the prior agreement of employees for each mission exceeding the contractual duration. Result: during an URSSAF audit covering 3 financial years, no adjustment was made on the overtime aspect, whereas comparable firms in the same sector were on average subject to contribution back payment of €8,000 to €25,000 according to ACOSS reports.

A food retail chain with annual modulation

A food retail chain operating around ten regional outlets had implemented an annualised working time agreement, but communication to employees about their overtime counter remained opaque. Employees did not know whether their 39 or 40 hour weeks would ultimately generate overtime at the end of the period.

By dematerialising monthly hour records and having them electronically signed by each employee, management introduced transparency that reduced requests for information to the HR department by 40% and reduced the number of complaints at the end of the reference period. The estimated HR productivity gain represents approximately 0.3 FTE across the entire network.

Conclusion

Overtime is governed by a precise and binding legal framework: increase rates of 25% or 50%, annual contingent of 220 hours, mandatory compensatory rest, and obligation to objectively monitor working time. Any failure in managing these rules exposes the employer to back pay over three years, URSSAF adjustments and potentially significant labour court sanctions.

The dematerialisation of HR documents — amendments, hour records, modulation agreements — is now an essential lever for legally securing this management. Certyneo supports hundreds of companies in the electronic signature of their employment documents, with eIDAS compliance levels suited to each need.

Discover how Certyneo can transform your HR management: calculate your return on investment or get started free today.