Overtime: Supplement and Legal Calculation

Introduction: why the calculation of overtime remains a major issue

In France, overtime is one of the most contentious employment law subjects for both employers and employees. According to DARES data published in 2025, more than 9 million private sector employees carry out hours each year beyond the legal working time limit set at 35 hours per week by Law No. 2000-37 of 19 January 2000. Yet the rules for calculating the supplement, the triggering thresholds and documentary obligations remain poorly understood by many HR teams and legal departments. This article provides you with a comprehensive and up-to-date guide for 2026: legal definition, method of calculating the supplement, annual ceiling, recovery and documentary obligations — incorporating the latest legislative and conventional developments.

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1. Definition and triggering threshold for overtime

1.1 Legal working time as a reference

Overtime is all effective working hours completed beyond the legal weekly duration of 35 hours (or the equivalent duration if a time-off arrangement system is in place). This definition, set out in article L. 3121-28 of the French Labour Code, applies to employees covered by hourly arrangements. It excludes in principle senior employees on a fixed annual day rate, whose regime is subject to specific rules set out in articles L. 3121-58 onwards.

For a part-time employee, hours worked beyond their contractual duration are termed additional hours (and not overtime), with a distinct uplift regime.

1.2 Weekly accounting as the basic rule

The count is made week by week, the civil week being understood as Monday 0:00 to Sunday 24:00 (art. L. 3121-29 C. lab.), unless a company agreement provides for another reference period. In companies that have opted for a time-off arrangement over a period longer than the week (annualisation), overtime is calculated at the end of the reference period, by subtracting the volume of hours worked from the applicable conventional threshold.

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2. Uplift rates: calculating the legal and conventional supplement

2.1 Legal uplift rates

Article L. 3121-36 of the French Labour Code sets the minimum uplift rates for overtime:

• 25% for the first 8 hours of overtime per week (i.e. hours 36 to 43 inclusive);

• 50% from the 9th hour of overtime onwards (i.e. from the 44th hour onwards).

These rates are legal minima. A sector agreement, company agreement or establishment agreement may provide for higher rates. However, since the El Khomri Law of 8 August 2016, a company agreement may lower the uplift rate to a minimum of 10%, provided that no sector agreement explicitly opposes it.

Concrete calculation example: An employee whose gross hourly rate is €15 works 10 hours of overtime in the week.

• The first 8 hours: 8 × €15 × 1.25 = €150

• The next 2 hours: 2 × €15 × 1.50 = €45

• Total supplement: €195 (compared to €150 without uplift)

2.2 The question of the reference hourly rate

The reference hourly rate used as the basis for the calculation must include all elements of remuneration having the character of salary and paid in direct consideration for work. The Court of Cassation has regularly stated (notably Cass. soc., 23 November 2022, No. 21-11.776) that bonuses not linked to the quality or quantity of work do not fall within this scope, unlike seniority or performance bonuses.

2.3 Replacement of payment with compensatory time off

Instead of paid overtime, a collective agreement may provide that payment of overtime and its uplift is fully or partly replaced by equivalent compensatory time off (art. L. 3121-33 C. lab.). This time off, known as "replacement compensatory time off" (RCR), does not count towards the annual ceiling for overtime.

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3. The annual overtime ceiling

3.1 The legal reference volume

In the absence of a collective agreement, the annual overtime ceiling is set at 220 hours per employee (art. D. 3121-24 C. lab.). This ceiling can be modified — upwards or downwards — by an extended sector agreement or company agreement. Certain professional sectors, particularly in construction or catering, have separate conventional ceilings, sometimes set at 360 annual hours.

3.2 Overtime hours beyond the ceiling

Hours worked beyond the ceiling are not prohibited, but they are subject to a dual obligation:

• Prior consultation with the social and economic committee (CSE), under article L. 3121-33;

• Mandatory compensatory time off (COR) at 100% of the additional working time performed beyond the ceiling (art. L. 3121-38), without prejudice to the salary uplift.

Failure to comply with these rules exposes the employer to significant risks of employment tribunal proceedings and criminal penalties under article R. 3124-2 of the French Labour Code (a class 5 fine, up to €1,500 per infringement, increased to €3,000 in case of repeat offence).

3.3 Accounting and monitoring: the documentary obligation

The employer is required to put in place an objective, reliable and accessible system for recording working time for each employee, in accordance with the case-law of the Court of Justice of the European Union (CJEU, 14 May 2019, case C-55/18, CCOO v Deutsche Bank). In France, this obligation has been incorporated into the inspection practices of the DREETS. The register or time management software must make it possible to reconstruct hours worked week by week and to identify overtime hours worked.

It is precisely at this stage that solutions such as electronic signature for HR teams take on their full value: they allow you to formalise and archive amendments to employment contracts, recovery agreements or compensatory time off forms with enhanced probative value.

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4. Tax and social security exemptions: the updated "Tepa" scheme

4.1 Income tax exemption

Since the TEPA Law of 21 August 2007, renewed and amended by the Law of 16 August 2022, remuneration paid for overtime and additional hours is exempt from income tax up to €7,500 per year (ceiling applicable from 1 January 2023, art. 81 quater of the General Tax Code). This exemption applies to private sector employees as well as certain public servants.

4.2 Reduction in employee social contributions

In parallel, overtime entitles you to a flat-rate reduction in employee contributions set by decree. In 2026, this reduction is 11.31% of the gross remuneration of the hours concerned for employees under the general social security scheme. It applies within the limit of the amount of contributions and obligations of a legal or conventional nature owed by the employee.

The employer benefits from a flat-rate employer deduction of €0.50 per hour of overtime in companies with fewer than 20 employees (art. L. 241-18 of the Social Security Code), an advantage not to be overlooked when calculating the true cost of using overtime.

4.3 Eligibility conditions and pitfalls to avoid

To benefit from these exemptions, hours must be actually worked and the uplift must be paid in accordance with legal or conventional rules. Overtime hours recovered in the form of replacement compensatory time off do not entitle the employer to tax and social security exemptions (BOFiP, BOI-RSA-CHAMP-20-50-40, § 210). The distinction between payment and recovery is therefore strategically important for payroll optimisation.

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5. Formalisation and evidence: best documentary practices in 2026

5.1 The individual or collective agreement as the foundation

To require overtime, the employer is not required to obtain the employee's prior consent for hours within the ceiling: it is a management prerogative. However, any amendment modifying the contractual working duration or establishing a fixed rate must be the subject of a written signed agreement. This is where electronic signature compliant with the eIDAS regulation provides essential legal assurance, particularly for employers managing multiple sites or remote working teams.

5.2 The payslip as the key document

Overtime must be listed on the payslip with distinct mention of the number of hours worked and the uplift rate applied (art. D. 3243-2 C. lab.). In the event of an URSSAF inspection or employment tribunal dispute, the payslip is the first document examined. Any discrepancy between the time register and the payslip is systematically interpreted in favour of the employee by the employment tribunals.

5.3 Digitisation and secure archiving

In a context of increasing digitisation of HR processes, the electronic archiving of documents relating to working time — timesheets, ceiling notifications, recovery agreements — must comply with the security and integrity standards required by regulations. Using a comprehensive guide to electronic signature will allow you to structure your documentary compliance approach from end to end. To estimate the return on investment of such a digitisation approach, the electronic signature ROI calculator from Certyneo offers a personalised projection in just a few minutes.

Finally, it should be noted that documents relating to working time must be kept for 5 years from their date of issue (art. L. 3171-3 C. lab.), a constraint that argues for a digital archiving solution with probative value rather than paper.

Legal framework applicable to overtime

Founding texts of French employment law

The legal regime for overtime is mainly governed by articles L. 3121-28 to L. 3121-48 and D. 3121-24 of the French Labour Code (consolidated version in force as of 1 January 2026). These provisions distinguish between the general law regime (companies without a collective agreement) and the derogatory regime negotiated by a sector or company agreement, in accordance with the three-tier structure established by the Macron Ordinances of 22 September 2017 (Ordinances No. 2017-1385 to 2017-1388).

Article L. 3121-36 sets the legal minimum uplift rates (25% and 50%). Article L. 3121-33 governs the conditions for implementing replacement compensatory time off. Article L. 3121-38 defines mandatory compensatory time off for hours beyond the ceiling.

Reference case-law

The CJEU, 14 May 2019, case C-55/18 (Federación de Servicios de Comisiones Obreras v Deutsche Bank SAE) established the obligation for Member States to put in place an objective and reliable system enabling the measurement of the daily working time of each worker. This decision, incorporated into the inspection practices of the French labour inspectorate (circular DGT 2022-01), strengthens employers' documentary traceability obligations.

The Court of Cassation has further clarified (Cass. soc., 18 March 2020, No. 18-10.919) that the burden of proof regarding overtime is shared: the employee must provide sufficiently precise details of hours worked, and the employer must in response produce its own control documents.

Tax and social security obligations

Income tax exemption is codified in article 81 quater of the General Tax Code, amended by Law No. 2022-1158 of 16 August 2022 on emergency measures to protect purchasing power. The employer deduction is provided for in article L. 241-18 of the Social Security Code. The reporting procedures are detailed in URSSAF instructions and BOSS documentation (Official Bulletin of Social Security, "Overtime and additional hours" section, updated January 2026).

Sanctions and contentious risks

Failure to comply with overtime rules exposes the employer to several cumulative risks: back pay with legal interest, damages for undeclared work (art. L. 8221-5 C. lab.), URSSAF reassessment of evaded contributions, and criminal fines (art. R. 3124-2 C. lab.). In the event of flagrant undeclared work, penalties can reach 3 years' imprisonment and €45,000 in fines (art. L. 8224-1 C. lab.).

Usage scenarios: documentary management of overtime

Scenario 1 — An industrial SME with 80 employees on rotating shifts

An industrial SME employing around eighty employees spread over three rotating shifts (morning, afternoon, night) must manage several dozen amendments each month related to exceeding the conventional ceiling, as well as forms for choosing between paid uplift and replacement compensatory time off. Before digitisation, the paper processing of these documents generated signature delays of 5 to 10 days (travel between sites, loss of internal mail) and filing errors affecting the company's defence during URSSAF inspections.

By deploying an eIDAS-compliant electronic signature solution for formalising these HR documents, the SME reduced its signature lead time to less than 24 hours and eliminated the risk of document loss. According to sector benchmarks from ANDRH (2024), this type of approach reduces the processing time for administrative documents relating to working time management by 60 to 75%.

Scenario 2 — A fast food franchise network

A fast food franchise network comprising around thirty outlets and approximately 400 fixed-term and permanent employees faces a high volume of overtime during peak periods (school holidays, local events). The complexity lies in the multiplicity of collective agreements applicable depending on sites and the need to quickly notify affected employees of their compensatory time off rights.

The integration of an electronic signature module into the network's HR management system enabled automation of notifications of compensatory time off rights (art. D. 3121-18 C. lab.) and collection of electronically signed acknowledgements of receipt. URSSAF data shows that franchise networks that have digitised this process reduce employment tribunal disputes relating to contested overtime accounting by an average of 40%, due to lack of sufficient documentary evidence on the employer's side.

Scenario 3 — An accounting firm managing payroll for its SME clients

An accounting firm with around twenty staff manages social affairs for approximately 150 SME clients. For each client, it must formalise ceiling amendments, modulation agreements and TEPA exemption supporting documents sent to URSSAF. Multi-client management made paper tracking unworkable: risks of file confusion, validation delays and lack of clear audit trail.

By adopting a multi-mandate electronic signature platform, the firm was able to centralise all documentary flows relating to overtime for its clients, with time-stamped traceability per file. According to feedback published by the OEC (Institute of Chartered Accountants, digital report 2025), this type of deployment generates productivity gains of around 3 to 5 hours per week per payroll manager, representing savings estimated at €8,000-12,000 per year for a firm of this size.

Conclusion

The legal calculation of overtime in 2026 is based on a complex set of legal, conventional and case-law rules that neither HR teams nor legal departments can afford to ignore. Uplift rates, annual ceiling, mandatory compensatory time off, TEPA exemptions and documentary obligations are all points of attention that can give rise to costly disputes in case of error or lack of documentary evidence.

Rigorously formalising your HR documents relating to working time — amendments, recovery agreements, notifications of compensatory time off rights — with an eIDAS-compliant electronic signature solution is today the best legal and operational guarantee. Certyneo offers you a secure, compliant and simple-to-deploy platform for all your teams.

👉 Discover how Certyneo secures your HR processes or get started free from our pricing page.