Overtime: Pay Increases and Legal Calculation

Introduction: why master the overtime regime?

Overtime is one of the most frequent sources of disputes between employers and employees in employment law. In France, its regime is governed by the Labour Code, sector-wide agreements and collective agreements that set pay increase rates, annual caps and reporting obligations. At a time when the digitalisation of human resources is accelerating — particularly thanks to electronic signature for HR — proper management of overtime documentation has become a compliance issue in its own right. This article deciphers the rules applicable in 2026: definition, calculation, legal pay supplements, annual cap and specificities linked to fixed-hour contracts.

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Legal definition and scope of application

What is overtime?

According to Article L. 3121-28 of the Labour Code, overtime means all working hours carried out 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);

• Senior managers on a fixed working-day contract, whose count is based on a number of days worked rather than a weekly schedule;

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

The count is carried out week by calendar week (from Monday 0:00 to Sunday 24:00, unless a collective agreement sets a different reference period). Overtime cannot be carried over from one week to another without a collective agreement on working time arrangements.

Overtime and maximum working hours

The use of overtime cannot be unlimited. The Labour Code imposes strict caps:

• 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), which represents 13 hours of overtime per 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 contractual cap

Article L. 3121-30 of the Labour Code sets the legal cap at 220 hours per year per employee. This limit can be adjusted by company or sector-wide collective agreement:

• Upwards (with no 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 public sector healthcare branches, 180 hours in retail trade, 282 hours in construction. It is therefore essential to consult the applicable collective agreement before planning any overtime exceeding 220 hours.

Beyond the cap: mandatory rest compensation

Any overtime hour completed beyond the annual cap entitles the employee to a mandatory rest compensation (COR), formerly called "mandatory rest compensation". Since the Labour Law of 8 August 2016, the 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 pay supplement and must be taken within two months following the right to it. Non-compliance with this obligation exposes the employer to civil sanctions (compensation for the employee) and criminal penalties (class 4 fine, i.e. €750 per employee concerned).

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Calculation and pay increase rates for overtime

Legal pay increase rates

In the absence of a collective agreement, overtime is supplemented according to the scale set out in Article L. 3121-36 of the Labour Code:

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

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

Practical calculation method

The calculation of the pay supplement is based on the gross hourly rate, excluding exceptional bonuses not linked to work performed. The formula is as follows:

Overtime remuneration = Gross hourly rate × (1 + pay increase rate)

Concrete example: an employee with a gross monthly salary of €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 hour of overtime at 25% is remunerated at €20.60; at 50%, €24.72.

Replacement of pay supplement by replacement rest compensation

The employer may, with the employee's agreement or via collective agreement, replace all or part of the pay supplement with a replacement rest compensation (RCR). This mechanism, provided for in Article L. 3121-33 of the Labour Code, allows the employer to preserve cash flow whilst 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 law of 2007, reaffirmed and reformed by the law of 16 August 2022 (the 'purchasing power' law), remuneration received for overtime benefits from an income tax exemption, up to a limit of €7,500 per year (art. 81 quater of the General Tax Code). This exemption applies to private sector employees as well as public sector employees (within the conditions defined by their respective statutes).

Reduction in employee social contributions

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

For companies with fewer than 20 employees, a flat-rate 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 real cost for the employer.

Employer reporting obligations

The employer must report overtime via the Personalized Social Declaration (DSN), using the specific codes provided by the DSN technical manual. Any omission or reporting error may lead to a challenge of the exemptions and an URSSAF adjustment. The retention of supporting documents (timesheets, contract amendments, collective agreements) is recommended for a minimum period of 5 years — the period of prescription in employment matters.

In this context, the use of an electronic signature tool in the company to formalise contract amendments linked to overtime guarantees the timestamping and integrity of the signed document. Similarly, 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 and remote working

Employees on fixed-hour contracts

Employees whose contract provides for a fixed number of hours per week or month are subject to a hybrid regime. Hours included in the fixed number and exceeding 35 hours per week are overtime, but their pay supplement is generally incorporated into the fixed salary. In case of dispute, the Court of Cassation requires the payslip to clearly identify the proportion of remuneration corresponding to these hours (Cass. Soc., 14 May 2014, no. 12-35033).

Employees working remotely

Remote working does not change the overtime regime. The remote worker must comply with the same maximum durations and benefits from the same pay supplement rights. The difficulty lies in the counting of actual working time: the employer is required to put in place 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 linked to these situations, the electronic signature ROI calculator proposed by Certyneo allows you to evaluate the time savings generated by the dematerialisation of amendments and associated administrative documents.

Overtime and part-time: do not confuse

It is important to distinguish carefully 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 sector agreement). The applicable pay increase is 10% for hours within the limit of one-third of the contracted duration, and 25% beyond. Any confusion on the payslip exposes the employer to a reclassification of the part-time contract as a full-time contract.

For further information on the management of work contract documentation, Certyneo's complete guide to electronic signature details compliant eIDAS solutions applicable to HR documents.

Legal framework applicable to overtime

The overtime regime is based on a layered body of law, articulating statutory, contractual 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 the legal annual cap at 220 hours, adjustable by collective agreement.

• Art. L. 3121-33: option to replace the pay supplement by replacement rest compensation, by collective agreement or individual agreement.

• Art. L. 3121-36: legal pay 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 cap.

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

Social Security Code:

• Art. L. 241-18: flat-rate 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 per year.

Key case law:

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

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

Legal risks for the employer: Failure to comply 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 Labour Code); reclassification of the employment relationship; URSSAF adjustment with cancellation of exemptions; prosecution for undeclared work (5 years' imprisonment and €75,000 fine, art. L. 8224-1); liability for damages for moral injury.

The digitalisation of HR management — in particular through electronic signature tools compliant with eIDAS Regulation No. 910/2014 of the European Parliament and Council — helps to secure evidence of the employee's agreement to amendments and fixed-hour contracts, strengthening the employer's position in case of employment tribunal proceedings.

Usage scenarios: managing overtime efficiently

Scenario 1 — An 80-person SME in manufacturing facing production peaks

An SME employing approximately 80 production staff faces quarterly order peaks requiring 6 to 10 hours of overtime per employee per week over 8 consecutive weeks. Before digitalisation, validation of overtime was based on manually signed paper timesheets, resulting in processing delays of 3 to 5 working days and frequent calculation errors (estimated variance of 4% of the declared working hours according to sector benchmarks).

By implementing an electronic signature workflow for overtime amendment forms, the SME reduced its validation delay to less than 2 hours. The timestamped amendments and stored in a digital safe constitute proof that can be used in case of URSSAF inspection, reducing the risk of adjustment linked to DSN reporting errors.

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

An accountancy firm managing payroll for approximately 120 SME clients, representing around 1,800 monthly payslips, is regularly faced with the complexity of tracking overtime in sectors with heterogeneous collective agreements (construction, retail, hospitality). Questions about applicable pay increase rates, contractual caps and tax exemptions represent approximately 30% of the assistance requests received by 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 spent drafting amendments linked to overtime, whilst ensuring that clauses comply with applicable agreements. The generated documents are sent directly for electronic signature to the employees concerned, without re-entry.

Scenario 3 — An agricultural employer group

An agricultural employer group bringing together 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 is counted over an annual reference period, which complicates real-time calculation and compliance with the contractual cap of 180 hours set out 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 records has enabled the group to have real-time monitoring of each employee's overtime counter. The risks of unforeseen cap overrun — and thus unprovisioned COR obligation — have been significantly reduced, with an estimated improvement of 35% in the reliability of wage mass forecasts.

Conclusion

Overtime is governed by a precise legal framework that every employer must understand: 25% then 50% pay increase rates, an annual cap of 220 hours, mandatory rest compensation and strictly regulated tax and social exemptions. Ignorance of these rules exposes the company to URSSAF adjustments, back pay and prosecution for undeclared work. Conversely, rigorous and digitalised management — in particular through electronically signed amendments — strengthens the employer's legal security and employee trust.

Certyneo supports you in digitalising your HR processes: from signing amendments to work contracts through to compliant eIDAS 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.