Overtime Hours: Increase and Legal Calculation

Introduction: why master the overtime regime?

Overtime is one of the most frequently contested topics in labor law between employers and employees. In France, its regime is governed by the Labor Code, collective agreements and industry agreements that set the bonus rates, annual ceilings and declaration requirements. At a time when the digitalization of human resources is accelerating — notably through electronic signature for HR — proper management of overtime documentation becomes a compliance issue in its own right. This article deciphers the rules applicable in 2026: definition, calculation, legal bonuses, annual contingent and specifics related to fixed-hour arrangements.

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Legal definition and scope of application

What is an overtime hour?

According to article L. 3121-28 of the Labor Code, overtime hours are all effective working hours performed beyond the legal weekly duration of 35 hours for full-time employees under the standard regime. This definition therefore excludes:

• Part-time employees (whose hours beyond the contract are classified as supplementary hours, not overtime);

• Managers on a fixed daily arrangement, whose count is based on a number of days worked rather than a weekly schedule;

• Employees under a fixed weekly or monthly hourly arrangement, who benefit from a specific regime incorporating overtime from the conclusion of the contract.

Counting is carried out calendar week by calendar week (from Monday 0:00 to Sunday 24:00, unless a collective agreement sets another reference period). Overtime hours cannot be offset from one week to another without a collective agreement on work time adjustment.

Overtime and maximum working hours

Recourse to overtime cannot be unlimited. The Labor Code imposes strict ceilings:

• 10 hours: maximum daily duration (art. L. 3121-18), increased to 12 hours by collective agreement or in case of exceptional circumstances authorized by the labor inspector;

• 48 hours: absolute maximum weekly duration (art. L. 3121-20), which represents 13 overtime hours per week;

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

These maximum durations apply without prejudice to the annual overtime contingent.

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The annual overtime contingent

Legal and conventional contingent

Article L. 3121-30 of the Labor Code sets the legal contingent at 220 hours per year per employee. This ceiling can be adjusted by company or industry collective agreement:

• Upward (without explicit legal ceiling, but subject to absolute maximum durations);

• Downward, for employment policy or internal organization reasons.

In practice, many collective agreements set different contingents: 130 hours in certain public hospital sectors, 180 hours in retail, 282 hours in construction. It is therefore essential to check the applicable collective agreement before planning overtime exceeding 220 hours.

Beyond the contingent: mandatory rest compensation

Any overtime hour completed beyond the annual contingent gives right to mandatory rest compensation (COR), formerly called "mandatory compensation rest". Since the Labor Act of August 8, 2016, the COR is fixed at:

• 50% for companies with 20 employees or fewer;

• 100% for companies with more than 20 employees.

This compensation is in addition to the salary increase and must be taken within two months following the right accrual. Non-compliance with this requirement exposes the employer to civil sanctions (employee compensation) and criminal penalties (4th class fine, i.e. €750 per employee concerned).

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Calculation and overtime bonus rates

Legal bonus rates

In the absence of a collective agreement, overtime is bonused according to the scale provided in article L. 3121-36 of the Labor Code:

| Overtime hours | Legal bonus rate | |---|---| | 1st to 8th hour (36th to 43rd) | 25% | | From the 9th hour (44th and beyond) | 50% |

A industry or company agreement may lower this rate to a minimum of 10% (art. L. 3121-33). Below that, the clause would be void and legal rates would apply as of right.

Practical calculation method

The bonus calculation is based on the gross hourly rate, excluding exceptional bonuses unrelated to work performed. The formula is as follows:

Overtime pay = Gross hourly rate × (1 + bonus rate)

Concrete example: an employee whose monthly gross salary is €2,500 for 151.67 hours worked (based on 35 h/week × 52/12) has a gross hourly rate of €16.48 (2,500 / 151.67). An overtime hour at 25% is paid €20.60; at 50%, €24.72.

Replacement of the bonus by replacement compensation rest

The employer may, with the employee's agreement or via collective agreement, substitute all or part of the salary increase with replacement compensation rest (RCR). This mechanism, provided for in article L. 3121-33 of the Labor Code, allows the employer to preserve cash flow while offering the employee free time. Hours thus compensated do not count toward the annual contingent.

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Tax and social exemptions: the updated "Tepa" scheme

Income tax exemption

Since the TEPA Act of 2007, continued and reformed by the Act of August 16, 2022 (called "purchasing power"), remuneration received for overtime benefits from an income tax exemption, up to €7,500 per year (art. 81 quater of the General Tax Code). This exemption applies to private sector employees as well as civil servants (under conditions defined by their respective statutes).

Reduction in employee contributions

Furthermore, overtime is subject to an 11.31% reduction in employee contributions (rate applicable in 2026, subject to the annual order). This reduction is calculated on overtime remuneration, including the bonus, and directly reduces the social charges deducted from the employee's pay slip.

For companies with fewer than 20 employees, a flat employer deduction of €0.50 per overtime hour also applies (art. L. 241-18 of the Social Security Code). This scheme encourages the use of overtime in SMEs/very small enterprises by reducing their actual cost to the employer.

Employer declaration obligations

The employer is required to declare overtime via the Nominative Social Declaration (DSN), using the specific codes provided for in the DSN technical specification. Any omission or declaration error may result in reconsideration of exemptions and URSSAF adjustment. Retention of supporting documents (timesheets, contract amendment, collective agreements) is recommended for a minimum period of 5 years — the prescription period for labor matters.

In this context, the use of an electronic signature tool in the enterprise to formalize contract amendments related to overtime ensures timestamping and document integrity. Similarly, the downloadable contract templates available on Certyneo can serve as a basis for quickly drafting compliant amendments.

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Special cases: fixed hours, part-time and remote work

Employees on a fixed-hour arrangement

Employees whose contract provides for a fixed weekly or monthly hourly arrangement are subject to a hybrid regime. Hours included in the arrangement and exceeding 35 weekly hours are overtime, but their bonus is generally integrated into the fixed salary. In case of dispute, the Court of Cassation requires that the pay slip clearly identifies the portion of remuneration corresponding to these hours (Cass. Soc., May 14, 2014, no. 12-35033).

Remote work employees

Remote work does not change the overtime regime. The remote work employee must respect the same maximum durations and benefits from the same bonus rights. The difficulty lies in counting effective working time: the employer is required to implement an objective, reliable and accessible system for measuring working time, in accordance with the CJEU ruling of May 14, 2019 (case C-55/18, CCOO v. Deutsche Bank). Non-compliance with this obligation may constitute concealed work.

To effectively manage HR documentation related to these situations, the ROI calculator for electronic signature offered by Certyneo makes it possible to assess the time savings generated by the dematerialization of amendments and associated administrative documents.

Overtime and part-time: do not confuse

It is important to carefully distinguish between overtime and supplementary hours. Part-time employees cannot work overtime in the strict sense. Their hours beyond the contracted volume are supplementary hours, limited to 10% of the contracted duration (or 33% by industry agreement). The applicable bonus is 10% for hours within one-third of the contracted duration, and 25% beyond. Any confusion on the pay slip exposes the employer to reclassification of the part-time contract as a full-time contract.

For more information on HR document management, the comprehensive guide to electronic signature from Certyneo details compliant eIDAS solutions applicable to HR documents.

Legal framework applicable to overtime

The overtime regime rests on a stratified body of law, articulating legal, conventional and regulatory standards.

Labor Code — Main provisions:

• Art. L. 3121-28: definition of overtime as hours performed beyond the legal 35-hour weekly duration.

• Art. L. 3121-30: setting the legal annual contingent at 220 hours, adjustable by collective agreement.

• Art. L. 3121-33: possibility to replace salary increase with replacement compensation rest, by collective agreement or individual agreement.

• Art. L. 3121-36: legal bonus rates (25% then 50%) in the absence of a collective agreement.

• Art. L. 3121-38 to L. 3121-40: mandatory rest compensation for hours beyond the contingent.

• Art. L. 8221-5: concealed work, notably characterized by failure to mention overtime on the pay slip.

Social Security Code:

• Art. L. 241-18: flat employer deduction of €0.50 per overtime hour for companies with fewer than 20 employees.

General Tax Code:

• Art. 81 quater: income tax exemption for overtime remuneration up to €7,500 annually.

Reference case law:

• Cass. Soc., May 14, 2014, no. 12-35033: obligation to identify overtime remuneration on the pay slip for employees on a fixed-hour arrangement.

• CJEU, May 14, 2019, case C-55/18 (CCOO v. Deutsche Bank SAE): obligation for the employer to implement an objective and reliable system for tracking daily working time for each employee.

Legal risks for the employer: Non-compliance with overtime rules exposes the employer to several types of sanctions: back pay with interest (3-year prescription period for wages, art. L. 3245-1 of the Labor Code); reclassification of the employment relationship; URSSAF adjustment with cancellation of exemptions; prosecution for concealed work (5 years imprisonment and €75,000 fine, art. L. 8224-1); condemnation to damages and interest for moral injury.

The digitalization of HR management — notably through electronic signature tools compliant with eIDAS regulation no. 910/2014 of the European Parliament and Council — helps secure proof of employee agreement to amendments and fixed-hour arrangements, strengthening the employer's position in case of labor court proceedings.

Use scenarios: managing overtime efficiently

Scenario 1 — An 80-employee industrial SME facing production peaks

An industrial SME employing around 80 production workers must face quarterly order peaks requiring 6 to 10 overtime hours per employee per week over 8 consecutive weeks. Before digitalization, overtime validation was based on manually signed paper sheets, resulting in processing delays of 3 to 5 working days and frequent calculation errors (estimated variance of 4% of reported hourly volume according to industry benchmarks).

By deploying an electronic signature workflow for overtime-related amendments, the SME reduced its validation time to less than 2 hours. Timestamped amendments and stored in a digital safe constitute evidence that can be used against URSSAF in case of inspection, reducing the risk of adjustment linked to DSN declaration errors.

Scenario 2 — An accounting firm managing payroll for 120 SME clients

An accounting firm managing payroll for approximately 120 SME clients, around 1,800 monthly payslips, is regularly faced with the complexity of tracking overtime in sectors with heterogeneous collective agreements (construction, retail, hospitality). Questions relating to applicable bonus rates, conventional contingents and tax exemptions account for approximately 30% of assistance requests to the firm.

By integrating an automated contract and amendment generator — such as the AI contract generator from Certyneo — the firm was able to reduce by around 40% the time spent drafting amendments related to overtime, while ensuring compliance of clauses with applicable agreements. Generated documents are sent directly for electronic signature to affected employees, without re-entry.

Scenario 3 — An agricultural employer group

An agricultural employer group federating around twenty farms and managing approximately 150 seasonal employees is subject to a specific work-time arrangement regime over the year (art. L. 3121-44 of the Labor Code). Overtime is counted over an annual reference period, which complicates real-time calculation and compliance with the conventional contingent set at 180 hours in the national collective agreement of agricultural production.

The implementation of a digital tracking tool coupled with an electronic signature solution to validate weekly attendance statements has enabled the group to have real-time tracking of each employee's hour counter. Risks of unanticipated contingent overruns — and thus unprovisioned COR obligations — have been significantly reduced, with an estimated 35% improvement in salary forecast reliability.

Conclusion

Overtime hours are subject to a precise legal framework that every employer must master: 25% then 50% bonus rates, annual contingent of 220 hours, mandatory compensation rest and framed tax and social exemptions. Ignorance of these rules exposes the company to URSSAF adjustments, back pay and prosecution for concealed work. Conversely, rigorous and digitalized management — notably through electronically signed amendments — strengthens the employer's legal security and employee confidence.

Certyneo supports you in digitalizing your HR processes: from signing amendments to employment contracts through to eIDAS-compliant archival. Discover our solutions tailored to HR teams and request a free demonstration on certyneo.com/solutions/rh or check out our Certyneo pricing to get started without commitment.