Overtime: Legal increase and calculation

Overtime is one of the most sensitive topics in French labor law. Between increase rates, annual contingent, compensatory replacement rest and administrative formalities, the rules are numerous and ignorance of them exposes the employer to significant URSSAF adjustments. In 2026, the legal framework has not fundamentally changed, but controls have intensified, particularly through the digitization of payslips and company agreements. This article deciphers, point by point, the obligations related to overtime: definition, thresholds, legal increase rates, calculation method and formalities to be respected.

What is overtime in French law?

Legal definition and triggering threshold

According to article L. 3121-28 of the Labor Code, any hour worked beyond the legal weekly working duration set at 35 hours constitutes an hour of overtime. This threshold is assessed over the calendar week, from Monday 0:00 to Sunday 24:00, except by company or sectoral agreement providing for another reference period.

For employees whose working hours are arranged over a period longer than a week (multi-year arrangement, modulation), the triggering threshold is calculated over the selected reference period: overtime hours then correspond to hours exceeding the average of 35 hours per week worked over that period.

Overtime and maximum working duration

Even in the presence of overtime, the employer is required to comply with the maximum working durations set by law:

• Maximum daily duration: 10 hours (art. L. 3121-18 C. trav.), increased to 12 hours by prefectural exemption or by collective agreement.

• Absolute maximum weekly duration: 48 hours in a given week (art. L. 3121-20 C. trav.).

• Average maximum weekly duration: 44 hours over a period of 12 consecutive weeks (art. L. 3121-22 C. trav.).

These limits apply regardless of any collective agreement. Their violation exposes the employer to criminal penalties (4th class fine, i.e. 750 € per employee concerned) and a risk of reclassification as undeclared work.

Legal increase rates: rules applicable in 2026

The general regime: 25% and 50%

In the absence of a specific collective agreement, the law sets the rates for increasing overtime as follows (art. L. 3121-36 C. trav.):

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

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

These rates apply to the gross base hourly rate, excluding bonuses and ancillary benefits unless otherwise provided for by agreement.

The possibility to modulate rates by collective agreement

A company agreement or, failing that, a sectoral convention can set different increase rates, provided that these are not less than 10% (art. L. 3121-33 C. trav.). This exemption is frequently used in the hospitality, construction or large-scale retail sectors, where sectoral agreements often provide for a uniform rate of 15% or 20% for the first hours of overtime.

It is therefore essential to consult the applicable collective agreement before calculating increases. Certyneo's HR solution notably makes it possible to digitize company agreements and salary amendments by integrating electronic signature compliant with the eIDAS regulation, guaranteeing their legal binding nature.

Increase and compensatory replacement rest (CRR)

Rather than paying overtime with increased remuneration in cash, the employer may, if a collective agreement provides for it — or, in the absence of an agreement, with the employee's consent —, allocate compensatory replacement rest (CRR). This rest must include the increase: for one hour of overtime at 25%, the employee will receive 1 hour 15 minutes of rest; for one hour at 50%, 1 hour 30 minutes of rest.

CRR is exempt from social contributions up to the legal contingent, making it a non-negligible social optimization tool for SMEs with high hourly intensity.

How to calculate overtime: method and examples

Calculation of the base hourly rate

The base hourly rate used to calculate increases is obtained by dividing the gross monthly remuneration by the theoretical hours of the month. In France, the legal monthly duration is 151.67 hours (35 h × 52 weeks / 12 months).

Example: An employee receives gross salary of 2,500 € for 35 hours per week.

• Base hourly rate = 2,500 / 151.67 = 16.48 €/hour

• Increase at 25% = 16.48 × 1.25 = 20.60 €/hour (36th to 43rd hour)

• Increase at 50% = 16.48 × 1.50 = 24.72 €/hour (from the 44th hour)

Concrete calculation over a given month

Let's take an employee who works, during a given week, 42 hours (i.e. 7 hours of overtime).

• Hours of overtime at 25%: 7 hours × 20.60 € = 144.20 €

• Hours of overtime at 50%: 0 hour (48-hour threshold not reached)

• Total increase due: 144.20 €

If the following week the same employee works 46 hours (11 hours of overtime):

• First 8 hours of overtime at 25%: 8 × 20.60 € = 164.80 €

• 3 hours of overtime at 50% (44th, 45th, 46th hour): 3 × 24.72 € = 74.16 €

• Total increase due: 238.96 €

The impact of forfeit arrangements

For employees on a annual hour-based forfeit, overtime hours are those exceeding the contractually fixed annual volume (for example, 1,800 hours). For employees on an annual day-based forfeit (autonomous managers), the overtime mechanism does not apply in the same way: it is the excess of the number of forfeit days that gives rise to compensation, according to the terms provided by the collective agreement instituting the forfeit. These derogatory regimes are regulated by articles L. 3121-53 to L. 3121-66 of the Labor Code.

The annual overtime contingent

Definition and setting of the contingent

The annual overtime contingent is the maximum volume of overtime hours an employee can perform over a calendar year without the employer needing to obtain authorization from the labor inspectorate. This contingent is set:

• At 220 hours per employee per year by decree (art. D. 3121-24 C. trav.) in the absence of a collective agreement.

• At a different volume (higher or lower) if a company or sectoral agreement expressly provides for it.

Beyond the contingent, each hour of overtime gives rise to a mandatory rest counterpart (MRC), also called legal compensatory rest. This counterpart is:

• 50% for companies with 20 employees or fewer.

• 100% for companies with more than 20 employees.

Monitoring the contingent and formalities

The employer is required to inform the social and economic committee (SEC) quarterly — or, failing that, employee representatives — of the volume of overtime worked and the volume of MRC rights opened (art. L. 3121-43 C. trav.). Unjustified exceeding of the contingent constitutes an infraction that may result in a formal notice from the labor inspectorate.

Digitization of HR documents — collective agreements, amendments, SEC information documents — through electronic signature for HR teams greatly facilitates traceability of these obligations. To go further, Certyneo's comprehensive electronic signature guide details the signature levels suitable for social documents.

Tax and social exemptions: the "overtime exemption" scheme

The exemption framework since the TEPA law

Since the TEPA law of 2007, renewed and strengthened by the law of August 16, 2022, overtime benefits from an advantageous tax and social exemption regime, codified in article 81 quater of the CGI and article L. 241-18 of the CSS:

• Exemption from income tax up to 7,500 € per year of gross remuneration for overtime (limit applicable since January 1, 2022).

• Reduction in employee contributions: flat reduction of 11.31% on the gross remuneration of overtime hours (2026 rate, revised annually by decree).

• Deduction of employer contributions: applicable only to companies with fewer than 20 employees, at the rate of 0.50 € per overtime hour.

Conditions for applying the exemption

To benefit from the exemption, overtime hours must:

• Be actually performed and remunerated (no recovery in rest fully substituting payment).

• Be clearly identified on the payslip, with mention of the volume of hours and the exempted amounts.

• Not result from a transformation of existing remuneration elements: the tax authorities severely punish schemes aimed at converting bonuses or benefits into fictitious overtime hours.

Rigorous management of these formalities — digitized payslips, electronically signed modulation agreements, CSE minutes archived — fits into an HR compliance approach that Certyneo's AI-powered contract generator can support, particularly for amendments modifying working duration.

Legal framework applicable to overtime

Overtime is governed by a set of legislative and regulatory provisions that must be mastered to avoid any risk of labor litigation or social adjustment.

Labor Code — main provisions:

• Art. L. 3121-28: definition of overtime and triggering threshold at 35 weekly hours.

• Art. L. 3121-33 and L. 3121-36: legal increase rates (25% and 50%) and possibility of derogation by collective agreement (minimum at 10%).

• Art. L. 3121-28 to L. 3121-32: rules on remuneration and compensatory replacement rest.

• Art. L. 3121-41 to L. 3121-43: annual contingent, mandatory rest counterpart and SEC information.

• Art. L. 3121-18 to L. 3121-22: maximum daily and weekly working durations.

• Art. D. 3121-24: regulatory setting of the annual contingent at 220 hours.

General Tax Code and Social Security Code:

• Art. 81 quater CGI: exemption from income tax on overtime within the limit of 7,500 €/year.

• Art. L. 241-18 CSS: reduction in employee contributions and flat deduction of employer contributions on overtime hours.

Penalties incurred: Non-compliance with overtime rules exposes the employer to several cumulative risks:

• Wage recovery before the labor tribunal, with legal interest and possibility of damages for undeclared work (flat compensation of 6 months' salary — art. L. 8223-1 C. trav.).

• URSSAF adjustment on evaded contributions, supplemented by late payment increases (5% + 0.2% per month — art. R. 243-18 CSS).

• Criminal penalties for exceeding maximum durations: 4th class fine (750 € per employee concerned, applied as many times as there are employees concerned).

• Administrative fine from the labor inspectorate in case of unjustified exceeding of the annual contingent or lack of SEC information.

Digitization and evidentiary value of documents: Collective agreements, amendments to employment contracts and documents relating to overtime can be signed and archived electronically. Their evidentiary value relies on the eIDAS regulation no. 910/2014 (and its eIDAS 2.0 revision being transposed), which recognizes advanced electronic signature as equivalent to handwritten signature insofar as it guarantees the identification of the signatory and the integrity of the signed document. The standards ETSI EN 319 132 (XAdES format) and ETSI EN 319 122 (CAdES format) specify the technical requirements applicable. The preservation of documents thus signed must comply with legal periods: 5 years for payroll registers (art. L. 3243-4 C. trav.) and 3 years for payslips provided to the employee.

Concrete usage scenarios

Scenario 1 — An industrial SME of 45 employees facing production peaks

An SME in the metalworking sector employing 45 operators regularly faces order peaks in the second quarter. It regularly resorts to 6 to 8 hours of overtime per week per employee during this period, which represents on average 180 hours of overtime per employee per year, i.e. a volume close to the legal contingent of 220 hours.

By establishing a company agreement negotiated with the SEC — setting a uniform increase rate of 20% for the first 8 hours of weekly overtime, in place of the legal 25% —, the SME achieves a saving in payroll costs of approximately 6% on overtime-related costs. The agreement is signed electronically by union representatives via a solution compliant with eIDAS, guaranteeing its binding force without delay. Digital traceability also makes it possible to respond in less than 48 hours to any request from the labor inspectorate or URSSAF, compared to several days previously with paper archives.

Scenario 2 — An accounting firm of 18 collaborators during tax season

An accounting and consulting firm of 18 collaborators experiences intense work overload from January to May (closings, tax returns). Over this period, collaborators work on average 5 to 7 hours of overtime per week. The firm opts for a system of compensatory replacement rest (CRR) rather than immediate cash remuneration, making it possible to grant recovery days in June and July, traditionally less busy.

Thanks to the digitization of schedules and individual CRR agreements — signed electronically by each employee and automatically archived —, the firm reduces the administrative time devoted to monitoring hours from 4 hours per month to less than one hour, i.e. significant HR productivity gains. The income tax exemption applicable to remunerated overtime hours (limit of 7,500 €) is systematically applied, improving the net income perceived by collaborators without extra cost to the employer.

Scenario 3 — A group of private clinics managing complex paramedical scheduling

A group of three private clinics representing approximately 350 employees (nurses, nursing assistants, technicians) applies a work time arrangement over 12 weeks. The complexity of schedules makes the calculation of overtime particularly tricky: overtime is triggered only upon exceeding the average of 35 hours over the reference period.

By integrating an automated tracking tool coupled with a electronic signature solution in the healthcare sector, the group secures the signature of scheduling amendments in real time, reduces payroll calculation errors by 23% (source: internal experience feedback over 12 months) and improves compliance with URSSAF requirements during controls. The SEC minutes recording changes to the reference period are archived with qualified timestamping, ensuring irreprehensible traceability.

Conclusion

Overtime is governed by a precise legal framework that every employer must master: increase rates of 25% and 50%, annual contingent of 220 hours, compensatory replacement rest, tax and social exemptions capped at 7,500 € per year. Non-compliance with these rules exposes the employer to URSSAF adjustments, labor tribunal wage recovery and significant criminal penalties.

The key to compliant management lies in administrative rigor: properly negotiated collective agreements, detailed payslips, regular SEC information and reliable archiving of documents. Digitization and electronic signature of HR documents are now an essential lever to secure this compliance while gaining operational efficiency.

To digitize your company agreements, salary amendments and HR documents with an eIDAS-compliant solution, discover Certyneo's offer or calculate your return on investment right now.