Overtime Hours: Increase and Legal Calculation

Introduction

Overtime hours constitute one of the most sensitive subjects in French labour law. When poorly managed, they expose the employer to URSSAF adjustments, employment tribunal disputes and significant tax penalties. In 2026, the legal framework remains primarily rooted in the Labour Code, but recent developments — particularly regarding tax relief and the annual limit — deserve particular attention. This article reviews the rules for calculating overtime hours, mandatory surcharge rates, the regulatory annual limit, applicable exemptions and tools enabling compliant and dematerialised management.

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Legal definition of overtime hours

According to article L. 3121-28 of the Labour Code, overtime hours are all hours of work performed beyond the legal weekly duration of 35 hours. This definition applies to employees under the common law regime, working full-time, subject to specific collective agreement provisions.

Scope and exclusions

The overtime regime does not apply to:

• senior executives (article L. 3111-2 of the Labour Code), who are subject neither to the legal duration nor to the annual limit;

• employees whose working time is counted on a daily or annual forfeit basis (articles L. 3121-58 onwards), for whom separate rules apply;

• part-time workers, whose hours worked beyond the contract but up to 35 hours are classified as supplementary hours (article L. 3123-8).

For employees on time modulation or annualised working time, overtime hours are calculated at the end of the reference period (generally the calendar year), comparing total actual hours worked to the annual threshold corresponding to 35 weekly hours, namely 1,607 hours per year (article L. 3121-41).

Concept of actual working time

Only actual working time counts, defined in article L. 3121-1 as "the time during which the employee is at the employer's disposal and complies with its instructions without being able to attend to personal matters freely". Rest periods, meal breaks, on-call time not mobilised and ordinary commuting time are in principle excluded, unless otherwise agreed.

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Calculation of overtime hours and surcharge rates

Remuneration of overtime hours is subject to mandatory surcharge rules set out in articles L. 3121-33 onwards of the Labour Code. These surcharges may be fixed by collective agreement, but can never be lower than the statutory floor.

Legal surcharge rates

In the absence of a collective agreement, the legal surcharge rates are as follows:

| Band of overtime hours | Minimum surcharge | |-----------------------------------|---------------------| | 1st to 8th hour (H36 to H43) | 25% | | Beyond the 8th hour (H44+) | 50% |

These rates apply to the employee's basic hourly rate. All bonuses and benefits included in the calculation basis of the reference salary must be taken into account, in accordance with the consistent case law of the Court of Cassation (notably Cass. soc., 11 January 2017, no. 15-23.341).

Calculation example: An employee whose gross monthly salary is €2,500 for 151.67 monthly hours has a basic hourly rate of €16.48. If this employee works 4 overtime hours within the first 8, their remuneration will be: 4 × 16.48 × 1.25 = €82.40 gross.

Collective agreement and rate adjustment

A branch or company agreement may set different surcharge rates, provided they do not fall below 10% (article L. 3121-33, II). Agreements in the construction, transport or hotel and catering sectors thus often provide for intermediate rates or specific brackets. It is therefore essential to consult the applicable collective agreement before any implementation.

Replacement by compensatory rest

The employer may, subject to conditions, replace payment of all or part of the increased overtime hours with compensatory rest time (article L. 3121-33, I). This rest must be taken within a period set by agreement or, failing that, within twelve months following the opening of the right. Failure to take the rest within this period does not extinguish the right: the employee retains his or her claim, which may be demanded in the event of contract termination.

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The annual overtime limit

The annual limit is the maximum volume of overtime hours an employee can work in a year without authorisation from the labour inspectorate. It constitutes a threshold for triggering additional obligations for the employer.

Limit volume

In the absence of a collective agreement, the statutory limit is set at 220 hours per employee per year (article D. 3121-24 of the Labour Code). A collective agreement may increase or decrease it. Some sectors (printing, media, food retail) have negotiated separate limits ranging from 130 to 360 hours.

Exceeding the limit and mandatory compensation

Any overtime hour worked beyond the limit gives rise to a mandatory compensatory rest (COR), provided for in article L. 3121-38. In the absence of an agreement, this compensation is:

• 50% of the time of hours exceeding the limit in companies with 20 or fewer employees;

• 100% in companies with more than 20 employees.

Non-compliance with this obligation exposes the employer to payment of damages calculated on the basis of the increased salary corresponding to the rest owed (Cass. soc., 22 September 2021, no. 19-16.714).

Employee notification

The employer must inform employees of the opening of their right to compensatory rest by written document appended to the pay slip (article D. 3121-18). Failure to provide this information constitutes an irregularity likely to result in reclassification and employment tribunal condemnation.

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Tax and social exemptions in 2026

Since the TEPA Act of 21 August 2007, strengthened by the "purchasing power" Act of 16 August 2022 and maintained in 2026, overtime hours benefit from a favourable tax and social regime that makes them a significant net remuneration lever.

Income tax exemption

Remuneration received for overtime hours is exempted from income tax up to an annual ceiling of €7,500 net (article 81 quater of the General Tax Code, amended by the 2024 Finance Act). This exemption applies directly at the level of the employee's tax return and must be shown separately on the pay slip.

Reduction in employee social contributions

Overtime hours are also subject to a flat-rate deduction of employee contributions (article L. 241-17 of the Social Security Code). The amount of this deduction is set by decree; for 2026, it stands at €1.50 per overtime hour in companies with fewer than 20 employees and €0.50 in those with 20 or more employees.

Employer deduction for SMEs

Employers with fewer than 20 employees also benefit from a flat-rate employer deduction of €1.50 per overtime hour (article L. 241-18 of the SSC). This deduction is in addition to general contribution reliefs, without being able to be combined beyond the amount of employer contributions actually owed.

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Management and traceability of overtime hours: compliance issues

Beyond calculation, proof of overtime hours constitutes a major litigation issue. Article L. 3171-4 of the Labour Code provides a shared probative regime: the employee must provide sufficiently precise information about the unpaid hours claimed to have worked, so that the employer can usefully respond.

Working time recording systems

The employer is required to implement an objective, reliable and accessible system for recording working time, in accordance with the Court of Justice of the European Union ruling of 14 May 2019 (case C-55/18, CCOO v. Deutsche Bank). This ruling, progressively transposed into domestic law, requires Member States to require employers to have a system enabling measurement of the daily working duration of each worker.

The solutions adopted may include: clocking-in software, signed timesheets, time management tools integrated into HR information systems. For dispersed or remote teams, electronic signature for HR offers enhanced traceability of working time records, amendments and recovery forms.

Dematerialisation of overtime-related documents

Managing overtime hours generates a significant documentary flow: mission orders, amendments to employment contracts authorising exceeding the limit, recovery sheets, rest compensation agreements. Dematerialising these documents via an eIDAS-compliant electronic signature solution allows for:

• reducing validation times (elimination of paper workflows);

• guaranteeing authenticity and integrity of signed documents;

• establishing an audit trail usable in the event of employment tribunal dispute.

A comparison of electronic signature solutions available on the market can help HR teams choose the tool best suited to their document volume and budget.

Pay slip and mandatory information

The pay slip must show distinctly (article R. 3243-1 of the Labour Code):

• the number of overtime hours worked;

• the surcharge rate applied;

• the amount exempt from income tax;

• the amount of the deduction of employee and, where applicable, employer contributions.

Absence of these details exposes the employer to reclassification and obligation to restore the employee's rights over the full applicable limitation period (3 years for wages, under article L. 3245-1).

For further information on digitalising HR processes, Certyneo's complete guide to electronic signature details the signature levels suited to each type of HR document, from simple amendment to the indefinite-term employment contract.

Legal framework applicable to overtime hours

The overtime regime is part of a dense legal framework, combining primary law, ordinary legislation and collective bargaining law.

Labour Code — fundamental provisions

• Article L. 3121-28: definition of overtime hours as hours worked beyond 35 weekly hours.

• Articles L. 3121-33 onwards: surcharge rates (25% for the first 8 hours, 50% beyond), possibility of replacement by compensatory rest, adjustment by collective agreement (floor of 10%).

• Article L. 3121-38: mandatory compensatory rest for hours exceeding the annual limit.

• Article D. 3121-24: statutory fixing of the annual limit at 220 hours in the absence of an agreement.

• Article L. 3171-4: shared burden of proof regarding working duration.

• Article L. 3245-1: three-year limitation period applicable to wage claims.

• Article R. 3243-1: mandatory information on the pay slip.

Social Security Code

• Article L. 241-17: flat-rate deduction of employee contributions on overtime hours.

• Article L. 241-18: flat-rate employer deduction for companies with fewer than 20 employees.

General Tax Code

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

European Union law

• Directive 2003/88/EC (working time): sets maxima for working duration (48 weekly hours, 11 hours daily rest, 24 hours weekly rest), within which the overtime regime operates.

• CJEU ruling, 14 May 2019, C-55/18, CCOO v. Deutsche Bank: requires Member States to impose an objective and reliable system for recording daily working time.

Dematerialisation and documentary compliance

Where documents relating to overtime hours (amendments, recovery agreements) are electronically signed, the eIDAS Regulation No. 910/2014 (articles 25 and 26) guarantees their legal value equivalent to handwritten signature within the European Union, provided an advanced or qualified electronic signature is used. The French Civil Code, article 1366, establishes the evidentiary value of electronic documents in French law, provided the signatory is reliably identified and the document's integrity assured.

Risks in case of non-compliance

Breaches of the overtime regime are subject to administrative sanctions (DREETS notice), URSSAF adjustments with late payment increases (10 to 80%), and employment tribunal condemnations which may include damages, wage recovery and recalculated dismissal indemnity. Concealed employment (article L. 8221-5 of the Labour Code), constituted notably by failure to report overtime hours, is punishable by 3 years' imprisonment and a €45,000 fine.

Usage scenarios: managing overtime in the business

Scenario 1 — Industrial SME with 80 employees in continuous production

An industrial SME employing around 80 production employees in 3x8 shift work frequently relies on overtime during peaks in orders. Before implementing a dematerialised system, mission orders and recovery forms circulated in paper form, causing validation delays of 3 to 5 days and frequent document loss.

By adopting an eIDAS-compliant electronic signature solution for HR documents, the company reduced average validation time to less than 4 hours, while establishing an automatic archive of each signed document. During a URSSAF inspection covering 24 months, all evidence of recording and recovery agreements could be produced in less than an hour, avoiding an estimated adjustment of €35,000.

Scenario 2 — Accountancy firm managing payroll for 150 SME clients

An accountancy firm handling outsourced payroll for 150 SME clients processed an average of 800 monthly pay slips mentioning overtime hours. The variety of applicable collective agreements (construction, retail, transport) made manual calculation of surcharge rates very time-consuming and error-prone (incorrect rate in approximately 4% of pay slips, according to the firm's own internal audit).

The implementation of a contract and amendment auto-generation tool, coupled with an electronic signature solution, reduced the calculation error rate to less than 0.5% and decreased average processing time per file by 22%. Hour-change amendments are now electronically signed by employee and employer in less than 24 hours.

Scenario 3 — Hospital group with approximately 1,200 agents

A medium-sized public hospital group managed overtime for non-medical agents under the provisions of Decree No. 2002-598 relating to hourly allowances for supplementary work (IHTS). Traceability of hour overruns relied on paper timesheets archived in departments, without reliable time-stamping.

Faced with several employment tribunal disputes over proof of actual working time, the establishment deployed an electronic recording system with digital signature of timesheets. Result: a 60% reduction in litigation related to overtime hours within 18 months, and the ability to produce enforceable evidence in 100% of cases processed. Certyneo's ROI calculator enabled estimation that the savings generated on litigation costs and administrative management exceeded the cost of the solution from the first year.

Conclusion

The overtime regime rests on a precise legal framework: mandatory surcharge rates (25% and 50%), annual limit of 220 hours, mandatory compensatory rest, tax and social exemptions conditional on rigorous reporting. Each link in this chain requires impeccable documentary traceability, both to meet legal obligations and to protect against the risk of adjustment and employment tribunal dispute.

Dematerialising HR documents related to overtime — amendments, recovery agreements, recording sheets — via an eIDAS-compliant electronic signature solution is today one of the most effective responses to these compliance and proof issues.

Certyneo supports HR and legal teams through this transition. Create your free account and discover how to secure and accelerate your document workflows today.