Overtime Hours: Supplements and Legal Calculation

Overtime hours constitute one of the most sensitive subjects in French labour law. Between the legal increase rates, the possibilities of arrangement by collective agreement and the declarative obligations weighing on the employer, the regulatory framework is dense and evolving. Mismanagement exposes the company to URSSAF adjustments, wage recalls and labour court sanctions. This article details methodically the legal definition, the rules for calculating supplements, the annual contingent regime and best practices for securing your time management. Whether you are an HR Director, payroll manager or SME leader, you will find here the concrete answers you are looking for.

Legal definition of overtime hours

What the Labour Code says

In accordance with article L3121-28 of the Labour Code, all hours of work performed beyond the legal weekly duration constitute overtime, fixed at 35 hours for virtually all full-time employees. The count is made on the calendar week, from Monday 0 h to Sunday 24 h, unless a company agreement sets another reference period (article L3121-32).

It is important to distinguish overtime from additional hours, which concern exclusively part-time employees. These follow a separate regime (article L3123-8 and following) and are not dealt with in this article.

Employees covered and exclusions

The legal regime of 35 hours applies to employees subject to a duration of work counted in hours. However, the following are excluded:

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

• Employees on annual day-based salary (article L3121-58), which are counted in days and half-days;

• Homeworkers and certain specific categories defined by decree.

For employees on hourly salary throughout the year, the threshold for triggering overtime is fixed contractually, within the limits provided by the branch 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 basic hourly pay, to which are added wage complements having the nature 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 h/week) receives an hourly rate of €13.19. If he/she performs 5 overtime hours in the week, the remuneration of these hours will be:

• 5 × €13.19 × 1.25 = €82.44 gross

The faculty of negotiation by collective agreement

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

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

Social and tax exemption: the Fillon-Macron scheme

Since the 2007 TEPA Act, strengthened by the 2018 "Future of Work" Act, overtime hours benefit from a deduction of employer social contributions and a reduction in income tax for the employee, limited to €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 correctly declared in DSN (Declared Social Nominative).

For companies with fewer than 20 employees, a forfeit employer 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 contingent of overtime hours

Setting and exceeding the contingent

The annual contingent represents the volume of overtime hours an employer can have an employee perform without prior authorization from the labour inspection authority. In the absence of a collective agreement, it is fixed by decree at 220 hours per year and per employee (article D3121-24).

A branch or company agreement may change this volume upwards or downwards (article L3121-33). Certain sectors have 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 compensatory replacement rest. In the absence of a collective agreement, this compensation is set at:

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

• 100% in companies with more than 20 employees.

COR must be taken within two months following the opening of the right. Failure to inform the employee of his/her rest entitlements constitutes an employer's fault susceptible to sanction.

Absolute maximum durations

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

• 10 hours per day (derogation possible up to 12 h by collective agreement or labour inspection authorization);

• 48 hours per week in absolute value;

• 44 hours on average over 12 consecutive weeks.

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

Employer obligations in terms of monitoring

Time counting and recording

The employer is required to establish a reliable and objective system for recording actual working time, in accordance with the consistent case law of the Court of Cassation and the CJEU ruling of 14 May 2019 (case C-55/18, CCOO v Deutsche Bank). This monitoring can take the form of timekeeping software, a weekly monitoring table countersigned, or any other traceable device.

The absence of a control device exposes the employer to a presumption of overtime in case of labour litigation: the employee can merely produce elements likely to support his/her claim, the employer then having to prove the hours actually worked.

The HR electronic signature solution proposed by Certyneo makes it possible in particular to dematerialise amendments to the employment contract fixing recurring overtime, thus 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, the rest entitlements acquired. 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 appended to the payslip specifying the number of hours of rest acquired, the number of hours taken and the available balance.

Sanctions for non-compliance

Breaches of the rules on overtime hours are liable to engage several types of liability:

• Class 4 misdemeanour (€750 per employee concerned) for exceeding the contingent without notifying the labour inspector;

• Salary recalls plus late payment interest before the Labour Court;

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

• In serious cases, requalification as disguised work (article L8221-5), resulting in a lump-sum indemnity of 6 months' salary.

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

Arrangements of working time and overtime

Annualization of working time

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

This arrangement is particularly widespread in sectors with seasonal activity (tourism, agriculture, commerce) and allows for smoothing activity variations without systematically generating overtime during peaks.

The hourly-based salary by week or month

Distinct from annual day-based salary, the hourly salary consists of agreeing contractually on a working duration of more than 35 hours (e.g. 39 h/week), including a fixed volume of overtime. These hours are then remunerated with their increase from hiring, without post-hoc triggering.

To guarantee the validity of such a salary, the electronic signature in the workplace of contractual amendments is becoming an increasingly common practice, allowing to preserve opposable evidence of the employee's agreement.

Part-time work and additional hours: do not confuse

As a reminder, part-time employees can perform additional hours beyond 10% of contractual duration (or 33% if a branch agreement allows), and these hours do not give rise to the same increases as overtime. The applicable rate is 10% for hours within the limit of the tenth, and 25% beyond.

Efficient management of documents related to working time arrangements can be considerably simplified by using the AI contract generator from Certyneo, which incorporates up-to-date legal clauses for different types of salary.

Legal framework applicable to overtime hours

French regulation on overtime hours is part of a stratified body of legislation and regulations, combining national law and European Union law.

Labour Code (legislative part):

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

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

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

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

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

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 mentions on the payslip relating to overtime hours.

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

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

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

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

Key legal risks: any employer who fails to pay overtime is liable to a wage recall for three years (article L3245-1 of the Labour Code), to URSSAF increases and, in case of deliberate concealment, to a qualification of disguised work (article L8221-5), liable to 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 specializing in mechanical subcontracting experiences quarterly peaks of orders requiring 6 to 8 overtime hours per week and 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 on payslips, generating recurring labour disputes.

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

A management 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 hourly salary agreement at 39 h including 4 overtime hours increased by 25%, but amendments were not systematically signed before taking office.

By adopting an electronic signature process for all HR contractual documents, the firm was able to establish opposable evidence of employee agreement for each mission exceeding contractual duration. Result: during a URSSAF audit covering 3 financial years, no adjustment was made on the overtime side, whereas comparable firms in the same sector underwent an average contribution recall of €8,000 to €25,000 according to ACOSS reports.

A food distribution chain with annual modulation

A food distribution chain operating a dozen regional sales points had implemented a working time annualization agreement, but communication to employees about their hours counter remained opaque. Employees did not know whether their weeks at 39 or 40 hours would ultimately generate overtime at the end of the period.

By dematerializing monthly hour returns and having them electronically signed by each employee, the department established a transparency that reduced requests for information to the HR department by 40% and reduced the number of claims at the end of the reference period. The estimated HR productivity gain represents the equivalent of approximately 0.3 FTE across the entire network.

Conclusion

Overtime hours are subject to 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 shortcoming in the management of these rules exposes the employer to wage recalls over three years, URSSAF adjustments and potentially serious labour court sanctions.

The dematerialization of HR documents — amendments, hour returns, modulation agreements — is now an essential lever for legally securing this management. Certyneo supports hundreds of companies in electronically signing their work documents, with eIDAS compliance levels tailored to each need.

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