Overtime Hours: Increase and Legal Calculation

Introduction: Why Master the Overtime Regime?

Overtime hours constitute one of the most frequently litigated subjects in employment law between employers and employees. In France, their regime is governed by the Labour Code, sectoral agreements and collective agreements that set bonus rates, annual caps and reporting obligations. At a time when the digitalisation of human resources is accelerating — notably thanks to electronic signatures for HR — proper documentary management of overtime has become an integral compliance issue. This article deciphers the applicable rules in 2026: definition, calculation, legal bonuses, annual cap and specificities related to salary packages.

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Legal Definition and Scope of Application

What is an Overtime Hour?

According to article L. 3121-28 of the Labour Code, overtime hours constitute all hours of effective work carried out beyond the legal weekly duration of 35 hours for full-time employees subject to the common law regime. This definition therefore excludes:

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

• Executives on a day-based package, whose count is based on a number of days worked rather than a weekly schedule;

• Employees under a weekly or monthly hour-based package agreement, who benefit from a specific regime integrating overtime from the conclusion of the contract.

The count is carried out week by 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 working time arrangements.

Overtime and Maximum Working Hours

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

• 10 hours: maximum daily duration (art. L. 3121-18), extended to 12 hours by collective agreement or in case of exceptional circumstances authorised by the labour inspectorate;

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

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

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

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The Annual Overtime Cap

Legal and Collective Cap

Article L. 3121-30 of the Labour Code sets the legal cap at 220 hours per year per employee. This ceiling may be adjusted by collective enterprise or sectoral agreement:

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

• Downwards, for reasons of employment policy or internal organisation.

In practice, many collective agreements set different caps: 130 hours in certain branches of the public hospital sector, 180 hours in retail commerce, 282 hours in construction. It is therefore essential to consult the applicable collective agreement before planning overtime exceeding 220 hours.

Beyond the Cap: Mandatory Compensation in Rest Days

Any overtime hour carried out beyond the annual cap gives entitlement to a mandatory compensation in rest days (COR), formerly called "mandatory compensatory rest". Since the Labour Act of 8 August 2016, the COR is fixed at:

• 50% for companies with 20 or fewer employees;

• 100% for companies with more than 20 employees.

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

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Calculation and Bonus Rates for Overtime Hours

Legal Bonus Rates

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

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

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

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 Hour Remuneration = 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 hours/week × 52/12) has a gross hourly rate of €16.48 (€2,500 / 151.67). An overtime hour at 25% is remunerated at €20.60; at 50%, €24.72.

Replacement of Bonus by Replacement Rest Days

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

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Tax and Social Exemptions: The Updated "Tepa" Scheme

Income Tax Exemption

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

Reduction in Employee Social Contributions

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

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 micro/small businesses by reducing its real cost to the employer.

Employer Reporting Obligations

The employer is required to declare overtime hours via the Nominal Social Declaration (DSN), using the specific codes provided for in the DSN technical specification. Any omission or error in declaration may result in a challenge to exemptions and a Social Security Administration (URSSAF) adjustment. The retention of supporting documents (timesheets, contract amendments, collective agreements) is recommended for a minimum period of 5 years — the prescription period in employment matters.

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

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Special Cases: Packages, Part-Time Work and Remote Work

Employees on Hour-Based Packages

Employees whose contract provides for an hour-based weekly or monthly package are subject to a hybrid regime. Hours included in the package and exceeding 35 hours per week are overtime hours, but their bonus is generally incorporated into the fixed salary. In case of dispute, the Court of Cassation requires that the payslip clearly identify the portion of remuneration corresponding to these hours (Cass. Soc., 14 May 2014, No. 12-35033).

Employees Working Remotely

Remote work does not change the overtime regime. The remote worker must comply with 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 14 May 2019 (case C-55/18, CCOO v. Deutsche Bank). Non-compliance with this obligation may constitute concealed employment.

To effectively manage HR documentation related to these situations, the electronic signature ROI calculator proposed by Certyneo allows you to assess the time savings generated by the dematerialisation of amendments and associated administrative documents.

Overtime and Part-Time Work: Do Not Confuse

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

To learn more about documentary management of employment contracts, the complete guide to electronic signatures from Certyneo details eIDAS-compliant solutions applicable to HR documents.

Legal Framework Applicable to Overtime Hours

The overtime regime is based on a stratified body of law, articulating legal, collective and regulatory standards.

Labour Code — Main Provisions:

• Art. L. 3121-28: Definition of overtime hours as hours worked beyond the legal duration of 35 hours per week.

• Art. L. 3121-30: Setting of the legal annual cap at 220 hours, modifiable by collective agreement.

• Art. L. 3121-33: Possibility to replace the salary bonus with replacement rest days, by collective 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 compensation in rest days for hours beyond the cap.

• Art. L. 8221-5: Concealed employment, in particular characterised by the absence of mention of overtime on the payslip.

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 hour remuneration up to €7,500 per year.

Reference Jurisprudence:

• Cass. Soc., 14 May 2014, No. 12-35033: Obligation to identify overtime hour remuneration in the salary statement for employees on hour-based packages.

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

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

The digitalisation of HR management — particularly through electronic signature tools compliant with eIDAS Regulation No. 910/2014 of the European Parliament and of the Council — helps secure proof of employee agreement on amendments and package agreements, strengthening the employer's position in case of employment tribunal disputes.

Usage Scenarios: Managing Overtime Efficiently

Scenario 1 — An 80-Employee Industrial SME Facing Production Peaks

An industrial SME employing around 80 people in production must cope with quarterly order peaks requiring 6 to 10 overtime hours per employee per week over 8 consecutive weeks. Before digitalisation, the validation of overtime hours was based on manually signed paper sheets, resulting in processing delays of 3 to 5 business days and frequent calculation errors (estimated gap of 4% of the declared hourly volume according to sector benchmarks).

By deploying an electronic signature workflow for hourly overage 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 cited against the Social Security Administration 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, i.e. around 1,800 monthly salary statements, is regularly confronted with the complexity of tracking overtime in sectors with heterogeneous collective agreements (construction, retail, hotel and catering). Questions relating to applicable bonus rates, collective caps and tax exemptions account for approximately 30% of the assistance requests addressed to the firm.

By integrating an automated contract and amendment generator — such as the AI-powered 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 Employment Group

An agricultural employment group federating around twenty farms and managing approximately 150 seasonal employees is subject to a specific working time arrangement regime over the year (art. L. 3121-44 of the Labour Code). Overtime hours are counted over an annual reference period, which complicates real-time calculation and compliance with the collective cap set at 180 hours in the national collective agreement for 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. The risks of unplanned cap exceedance — and therefore unprovided-for COR obligation — were significantly reduced, with an estimated 35% improvement in payroll forecast reliability.

Conclusion

Overtime hours obey a precise legal framework that every employer must master: 25% then 50% bonus rates, 220-hour annual cap, mandatory rest compensation and framed tax and social exemptions. Ignorance of these rules exposes the company to URSSAF adjustments, salary recovery and prosecution for concealed employment. Conversely, rigorous and digitised management — particularly through electronically signed amendments — strengthens employer legal certainty and employee confidence.

Certyneo supports you in the digitalisation of your HR processes: from signing amendments to employment contracts through to eIDAS-compliant evidence archiving. Discover our solutions tailored to HR teams and request your free demo on certyneo.com/solutions/rh or consult our Certyneo pricing to get started with no commitment.