Overtime Hours: Legal Calculation and Increase in 2026

Introduction: why master the overtime regime?

Overtime hours constitute one of the most frequently contentious 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 the increase rates, annual ceilings and declarative obligations. At a time when the digitalisation of human resources is accelerating — notably through electronic signature for HR — proper documentary management of overtime hours has become a full compliance issue. This article deciphers the rules applicable in 2026: definition, calculation, legal increases, annual contingent and specificities related to fixed-hour contracts.

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Legal Definition and Scope

What is an overtime hour?

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

• Part-time employees (whose hours beyond the contract are termed complementary hours, not overtime);

• Executives on a day-based contract, whose counting is based on the number of days worked rather than on a weekly schedule;

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

The count is made week by calendar week (from Monday 0 am to Sunday 24 pm, 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 hours and maximum working durations

Recourse to overtime must not be unlimited. The Labour 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 authorised by the labour inspectorate;

• 48 hours: absolute maximum weekly duration (art. L. 3121-20), representing 13 overtime hours over a 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 Labour Code sets the legal contingent at 220 hours per year per employee. This ceiling may be adjusted by company or sectoral collective 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 contingents: 130 hours in certain public hospital branches, 180 hours in retail, 282 hours in construction. It is therefore essential to consult the applicable collective agreement before planning overtime exceeding 220 hours.

Beyond the contingent: mandatory rest compensation

Any overtime hour performed beyond the annual contingent entitles the employee to mandatory rest compensation (COR), formerly called "mandatory compensation leave". Since the Labour Law of 8 August 2016, COR is set 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 accrual of the right. Non-compliance with this obligation exposes the employer to civil sanctions (compensation of the employee) and criminal penalties (fourth-class fine, i.e. €750 per affected employee).

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Calculation and Increase Rates for Overtime Hours

Legal Increase Rates

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

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

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

Practical Calculation Method

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

Overtime Hour Remuneration = Gross Hourly Rate × (1 + increase rate)

Concrete example: an employee whose monthly gross salary is €2,500 for 151.67 hours worked (basis 35 h/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 Increase by Replacement Rest Compensation

The employer may, with the agreement of the employee or via collective agreement, substitute all or part of the salary increase with replacement rest compensation (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 time off. Hours thus compensated do not count towards the annual contingent.

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Tax and Social Exemptions: the Updated "Tepa" Scheme

Income Tax Exemption

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

Reduction in Employee Social Contributions

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

For companies with fewer than 20 employees, a fixed 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-enterprises and SMEs by reducing its actual cost for the employer.

Declarative Obligations of the Employer

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

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

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Special Cases: Fixed-Hour Contracts, Part-Time Work and Telework

Employees on Fixed-Hour Contracts

Employees whose contract provides for a fixed number of weekly or monthly hours are subject to a hybrid regime. Hours included in the fixed amount that exceed 35 hours per week are overtime, but their increase is generally incorporated into the fixed salary. In case of dispute, the Court of Cassation requires that the payslip clearly identifies the portion of remuneration corresponding to these hours (Cass. Soc., 14 May 2014, no. 12-35033).

Employees in Telework

Telework does not change the overtime regime. The teleworking employee must comply with the same maximum durations and benefits from the same increase rights. The difficulty lies in counting actual 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). Failure to comply with this obligation may constitute undeclared work.

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

Overtime and Part-Time Work: Do Not Confuse

A clear distinction must be made between overtime and complementary hours. Part-time employees cannot perform overtime in the strict sense. Their hours beyond the contractual volume are complementary hours, limited to 10% of the contractual duration (or 33% by branch agreement). The applicable increase is 10% for hours within one-third of the contractual duration, and 25% beyond. Any confusion in the payslip exposes the employer to a reclassification of the part-time contract as a full-time contract.

To go further on the documentary management of employment contracts, Certyneo's comprehensive guide to electronic signature details compliant eIDAS solutions applicable to HR documents.

Legal Framework Applicable to Overtime Hours

The overtime regime is based on a stratified legal corpus, linking legal, conventional and regulatory standards.

Labour Code — Main Provisions:

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

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

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

• Art. L. 3121-36: legal increase 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: undeclared work, notably characterised by the absence of mention of overtime on the payslip.

Social Security Code:

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

General Tax Code:

• Art. 81 quater: exemption from income tax on overtime remuneration up to €7,500 per year.

Key Case Law:

• Cass. Soc., 14 May 2014, no. 12-35033: obligation to identify overtime remuneration in the payslip for employees on fixed-hour contracts.

• 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 counting 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: back pay with interest (3-year prescription for wages, art. L. 3245-1 of the Labour Code); reclassification of the working relationship; URSSAF correction with cancellation of exemptions; prosecution for undeclared work (5 years imprisonment and €75,000 fine, art. L. 8224-1); conviction to damages for moral harm.

The digitalisation 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 the employee's agreement to amendments and fixed-hour contracts, thereby strengthening the employer's position in case of labour court proceedings.

Usage Scenarios: Managing Overtime Hours Efficiently

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

An industrial SME employing around 80 people in production must deal with quarterly order peaks requiring 6 to 10 overtime hours per employee per week over 8 consecutive weeks. Before digitalisation, validation of overtime relied on manually signed paper sheets, causing processing delays of 3 to 5 working days and frequent calculation errors (estimated discrepancy of 4% of declared hours volume according to sectoral benchmarks).

By deploying an electronic signature workflow for hour-overrun amendments, the SME reduced its validation time to less than 2 hours. Timestamped amendments and stored in a digital safe-deposit box constitute evidence enforceable in case of URSSAF audit, reducing the risk of correction related to DSN declaration errors.

Scenario 2 — An Accounting Firm Managing Payroll for 120 Client SMEs

An accounting expertise firm managing payroll for some 120 client SMEs, approximately 1,800 payslips per month, regularly faces the complexity of tracking overtime in sectors with heterogeneous collective agreements (construction, retail, hospitality). Questions relating to applicable increase rates, conventional contingents and tax exemptions represent about 30% of assistance requests directed to the firm.

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

Scenario 3 — An Employer Group in the Agricultural Sector

An agricultural employer group federating around twenty farms and managing about 150 seasonal employees is subject to a specific regime for working time arrangements over the year (art. L. 3121-44 of the Labour 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 for agricultural production.

The implementation of a digital monitoring tool coupled with an electronic signature solution to validate weekly attendance statements enabled the group to have real-time monitoring of each employee's hour counter. Risks of unforeseen contingent overrun — and therefore unprovided COR obligation — were significantly reduced, with an estimated 35% improvement in salary mass forecast reliability.

Conclusion

Overtime hours follow a precise legal framework that every employer must master: increase rates of 25% then 50%, annual contingent of 220 hours, mandatory rest compensations and limited tax and social exemptions. Ignorance of these rules exposes the company to URSSAF corrections, back pay and prosecution for undeclared work. Conversely, rigorous and digitalised management — notably through electronically signed amendments — strengthens the employer's legal security and employee confidence.

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