Overtime: Increase and Legal Calculation

Introduction: Why Master the Overtime Regime?

Overtime is one of the most recurring topics in French employment law. Whether it's a seasonal spike in activity, an urgent project or temporary understaffing, almost all businesses resort to it at some point. However, the calculation, surcharge and compensation rules remain poorly understood, exposing employers to significant litigation risks. This article presents the complete legal framework applicable in 2026: definition, annual contingent, legal surcharge rates, exemptions from charges and contributions, as well as the documentary obligations imposed on the employer.

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What is Overtime? Legal Definition

The Legal Threshold for Activation

Under French law, any hour of work performed beyond the legal weekly duration of 35 hours for full-time employees is considered overtime (article L. 3121-28 of the French Labour Code). This threshold is assessed in principle on a calendar week basis (Monday 00:00 to Sunday 24:00), unless there is an agreement for annualisation or variation of working time.

For employees subject to an agreement for adjusting working time over a period longer than a week, overtime is counted at the end of the reference period, after compensating for high and low weeks.

Overtime in Collective Agreements

The law sets a minimum baseline, but collective branch agreements or company agreements may modify the activation threshold or calculation methods — provided they are not less favourable to the employee overall. It is therefore essential to consult the applicable collective agreement before any implementation. For secure documentary management of these agreements, electronic signature in the workplace simplifies the formalisation and archiving of collective amendments.

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Calculating Overtime: Method and Surcharge Rates

The Legal Surcharge Rate

Article L. 3121-36 of the French Labour Code provides, in the absence of a collective agreement, the following surcharge rates:

• 25% for the first 8 hours of overtime (from the 36th to the 43rd hour inclusive)

• 50% for hours worked beyond the 43rd hour

A company or branch agreement may set a different rate, but this cannot in any case be less than 10% (legal minimum since the law of 20 August 2008).

Calculation example: An employee whose gross hourly salary is €15 works 46 hours in the week, making 11 overtime hours.

• Hours 36 to 43 (8 h): €15 × 1.25 × 8 = €150

• Hours 44 to 46 (3 h): €15 × 1.50 × 3 = €67.50

• Total surcharge: €217.50 (instead of €165 without surcharge)

Recovery through Compensatory Rest

Instead of payment at the increased rate, a collective agreement may provide for compensatory rest (RCR): the employee then benefits from rest time equivalent to the remuneration plus the surcharge. One hour of overtime surcharged at 25% thus entitles 1 hour 15 minutes of rest. This mechanism is popular in sectors where schedule management is complex. Certyneo's HR solution allows you to digitise requests and validations for compensatory rest, with timestamped traceability in compliance.

The Annual Overtime Contingent

The annual contingent is the maximum volume of overtime a salaried employee can perform in a calendar year. It is set at 220 hours per year by the French Labour Code (article D. 3121-24), but can be modified by collective agreement — either upward or downward.

Beyond the contingent, the employer must:

• Inform and consult the Social and Economic Committee (CSE) before resorting to it;

• Grant a mandatory rest counterpart (COR): 50% of hours worked beyond the contingent in companies with fewer than 20 employees, 100% in companies with 20 or more employees.

Non-compliance with these obligations exposes the employer to civil sanctions (salary recovery, damages) and criminal penalties (Class 4 offence).

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Tax and Social Exemptions: the "Overtime" Scheme in 2026

Income Tax Exemption

Since the law no. 2007-1223 of 21 August 2007 (TEPA law), strengthened by the law of 16 August 2022 known as the "purchasing power" law, remuneration paid for overtime and additional hours is exempt from income tax within a limit of €7,500 per year (2026 threshold unchanged, to be verified in supplementary budget law).

This exemption is automatic: the employer has no particular steps to take, except to correctly identify and declare the amounts concerned on the Nominative Social Declaration (DSN).

Reduction in Employee Contributions

In parallel with the tax exemption, employees benefit from a reduction in employee contributions on overtime hours, within the limit of basic old-age insurance contributions. This reduction is calculated by URSSAF using a flat rate published annually. For 2026, the applicable rate remains 11.31% (subject to the URSSAF annual decree).

Flat-Rate Deduction of Employer Contributions

Employers with fewer than 20 employees benefit from a flat-rate deduction of €1.50 per overtime hour worked, for employer contributions. This deduction also applies in companies with 20 to fewer than 250 employees for hours worked beyond the collective working time where this is less than 35 hours.

All of these schemes impose rigorous and traceable management of hours worked. A complete guide to electronic signature can help you understand how to digitise your HR documents — corrected pay slips, amendments to employment contracts — with full probative value.

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Employer Obligations: Monitoring, Information and Procedures

Recording Working Duration

Article L. 3171-2 of the French Labour Code requires every employer to keep a document for monitoring working time duration for employees whose working time is not predetermined. This document must state the start and end times of each work period, or the duration of each period. It must be kept for 1 year and made available to the labour inspector.

In case of inspection or litigation before the Employment Tribunal, the absence of this document systematically works against the employer: the Court of Cassation considers that the burden of proof for actual working time rests with the employer (Cass. soc., 18 March 2020, No. 18-10.919).

Employee Information and CSE Consultation

The employer must:

• Inform each employee of the volume of overtime worked and rest entitlements acquired (via the pay slip or an attached document);

• Consult the CSE before exceeding the annual contingent and, generally, whenever there is a significant change to the organisation of working time;

• Declare in DSN overtime hours and exempt amounts, on pain of URSSAF adjustment.

To facilitate the signing and archiving of documents relating to working time (amendments, variation agreements, RCR request forms), tools such as Certyneo's AI contract generator allow you to produce compliant documents in minutes, ready for electronic signature.

Overtime and Day-Based Contracts: a Separate Regime

Employees subject to a day-based contract convention (autonomous managers, article L. 3121-58 of the French Labour Code) are not subject to provisions relating to overtime. Their working time is counted in days rather than hours. Exceeding the convention is governed by specific rules (purchase-back of rest days, mandatory amendment). Any attempt to requalify an invalid day-based contract as overtime can result in major salary recovery — a risk that businesses must anticipate with their legal advisors. Certyneo's solution for law firms assists legal professionals in securing their acts and advice.

Legal Framework Applicable to Overtime

The overtime regime in France rests on a structured legislative and regulatory basis that every employer must master to protect themselves against litigation risks.

French Labour Code — fundamental provisions:

• Article L. 3121-27: legal working time set at 35 hours per calendar week.

• Articles L. 3121-28 to L. 3121-39: definition, activation, surcharge and compensatory rest for overtime.

• Articles D. 3121-24 to D. 3121-26: regulatory annual contingent of 220 hours and mandatory rest counterpart.

• Article L. 3171-2: obligation to record working time duration and retain documents for one year.

• Article L. 3121-58 et seq.: regime for day-based contracts, distinct from overtime.

Tax and Social Provisions:

• Law No. 2007-1223 of 21 August 2007 (TEPA law): establishment of income tax exemption and reduction in employee contributions on overtime.

• Law No. 2022-1158 of 16 August 2022 known as the "purchasing power" law: increase in tax exemption threshold to €7,500 and extension of the scheme.

• Article L. 241-18 of the French Social Security Code: flat-rate deduction of €1.50 per overtime hour for employers with fewer than 20 employees.

• URSSAF Instructions 2026: flat-rate reduction in employee contributions set at 11.31%.

Key Case Law:

• Cass. soc., 18 March 2020, No. 18-10.919: reversal of burden of proof in favour of employee in the absence of employer recording.

• Cass. soc., 14 November 2018, No. 17-16.747: reminder that the judge may award salary recovery even in the absence of proof of explicit employer agreement, provided the employer was aware of the hours worked.

Risks of Non-Compliance: Failure to comply with overtime rules exposes the employer to: (1) salary recovery with damages for harm suffered; (2) URSSAF adjustments for evaded contributions; (3) Class 4 offences (€1,500 per affected employee, €3,000 in case of repeat) for non-compliance with maximum working hours; (4) nullity of contractual clauses contrary to public employment law. Rigorous record-keeping, secure retention and electronic signature constitute essential safeguards in case of inspection or litigation.

Usage Scenarios: Managing Overtime in Practice

Scenario 1 — Industrial SME with Seasonal Peaks

An industrial SME of around 80 employees, specialising in mechanical component manufacturing, faces orders that double between September and December. The company regularly resorts to 6 to 8 hours of overtime per employee per week during this period. Before implementing a digitised monitoring tool, managing overtime vouchers was manual: Excel files, paper signatures, validation delays. The risk of employment tribunal litigation was real, particularly on calculating surcharges applicable from the 44th hour.

By adopting an electronic signature solution integrated into its payroll software, the SME was able to:

• Reduce by 70% the time to validate overtime hours (from 5 days to 1.5 days on average);

• Establish timestamped and incontestable proof of each employee/employer agreement;

• Reliably transmit data to DSN without re-entry.

Scenario 2 — Restructuring Consulting Firm (Fewer than 20 Employees)

A consulting firm specialising in organisational restructuring with around 15 employee consultants, most of whom fall under day-based contracts, also employs 4 assistants subject to 35 hours. During a compliance audit, it emerged that the overtime of these assistants was not formalised, that weekly recording was not kept, and that flat-rate deductions of €1.50 per hour were not applied.

Regularisation involved:

• Implementation of a digital register for monitoring working time with weekly electronic validation;

• Drafting and signing of individual amendments specifying the terms for resorting to overtime;

• Retroactive recovery of the flat-rate deduction, representing approximately €1,800 annual savings on employer charges.

Scenario 3 — Healthcare Grouping with Care Personnel

A private hospital grouping of medium size (around 350 beds) encounters recurring difficulties managing overtime for nurses and healthcare assistants, subject to specific collective agreements (National Collective Convention for Private Hospitals). Conventional surcharge rates differ from legal rates, and the annual contingent is adjusted by branch agreement.

Implementation of a digitised workflow enabled:

• Automatic application of conventional rates (20% instead of 25% for the first 8 hours, in accordance with the CCN);

• Alerting managers as soon as a salaried employee's conventional contingent is reached, avoiding undeclared overruns;

• Reduction of payroll errors by 45% on variable items, according to internal HR indicators.

Conclusion

Overtime is governed by a precise legal framework that the employer cannot afford to ignore: legal or conventional surcharge rates, annual contingent, mandatory rest counterpart, tax and social exemptions, recording and DSN declaration obligations. In 2026, strengthened labour inspection controls and case law favourable to employees on matters of proof make flawless documentary management essential.

Certyneo allows you to digitise all documents related to working time management — amendments, compensatory rest agreements, validation forms — with probative value compliant with the eIDAS regulation. Discover our solutions tailored to your sector or calculate the return on investment of electronic signature for your organisation. Ready to take the step? Contact our team for a personalised demonstration.