Overtime Hours: Legal Increase and Calculation

Introduction: why overtime hours remain a key issue in 2026

Overtime hours constitute one of the most frequently debated topics in French labor law. Between legal obligations, annual caps, surcharge rates, and administrative formalities, employers must navigate a precise regulatory framework under pain of significant penalties. In 2026, with the generalization of digitalization of HR documents, the question of traceability of hours worked and their validation takes on a new dimension. This article guides you step by step through the legal calculation of overtime hours, applicable surcharges, annual caps, and best practices in documentation to secure your time management.

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Definition and triggering of overtime hours

What is an overtime hour?

According to article L.3121-28 of the French Labor Code, an overtime hour is any hour worked beyond the legal weekly working time, set at 35 hours for full-time employees. This threshold is assessed on a weekly basis (Monday 00:00 to Sunday 24:00), unless a company agreement provides for another reference period.

Several cumulative conditions must be met:

• The employee must be under a full-time employment contract;

• The hours must be worked at the employer's request, or at least with their tacit consent;

• The hours must exceed the applicable legal or contractual threshold.

Note that for employees on a days-based fixed schedule, the overtime regime does not apply directly — they are subject to a separate system for tracking the number of days worked.

The annual overtime cap

The annual cap is the maximum volume of overtime hours an employee can work over a calendar year. Set by collective agreement or, failing that, by decree, it is currently 220 hours per employee per year in the absence of a sectoral or company agreement (article D.3121-24 of the French Labor Code).

Beyond this cap, the employer may still resort to overtime, but only after consulting the CSE (Social and Economic Committee) and subject to compliance with mandatory compensatory rest counterparts (COR), calculated at 100 % of the excess time for companies with more than 20 employees, and 50 % for those with 20 or fewer employees (article L.3121-38).

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Calculation of overtime hours and legal surcharge rates

Legal rates applicable in the absence of an agreement

In the absence of a sectoral or company collective agreement or collective bargaining agreement, overtime hours are increased according to the following rates, defined in article L.3121-36 of the French Labor Code:

| Hours concerned | Legal surcharge rate | |---|---| | First 8 overtime hours (36th to 43rd hour) | 25% | | From the 9th overtime hour (44th hour and beyond) | 50% |

These rates apply to the employee's gross hourly base salary. The remuneration thus increased is fully subject to social contributions and income tax, subject to applicable tax and social exemptions (see below).

Contractual rates: a frequent derogation

A sectoral or company agreement may set surcharge rates lower than the legal rate, but with an incompressible floor set at 10% (article L.3121-33 of the French Labor Code). In practice, many collective agreements provide for differentiated rates — for example 25% for the first 4 overtime hours then 50%, or a uniform rate of 25% for all hours in certain sectors.

It is therefore imperative to consult the applicable collective agreement for the company before mechanically applying the legal rates.

Concrete calculation example

An employee receives a base salary of $12 gross/hour and works 40 hours in the week (i.e., 5 overtime hours).

• Regular hours (35h): 35 × 12 = $420

• 5 overtime hours at +25%: 5 × 12 × 1.25 = $75

• Total weekly gross: $495

If these 5 hours fall beyond the 43rd hour (e.g., 46 hours worked), overtime hours from the 44th to the 46th hour would be increased at 50%:

• 8h at +25%: 8 × 12 × 1.25 = $120

• 3h at +50%: 3 × 12 × 1.50 = $54

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Tax and social exemptions on overtime hours

The TEPA law and its successive amendments

Since the Law of August 21, 2007 known as the "TEPA Law," overtime hours have benefited from a favorable tax and social regime, renewed and strengthened by the Law of December 24, 2018 on urgent economic and social measures. In 2026, this scheme remains in force:

• Income tax exemption: the remuneration of overtime hours is exempt from income tax within the limit of $7,500 per year (article 81 quarter of the General Tax Code);

• Reduction in employee contributions: employees benefit from a flat-rate deduction of 11.31% (updated rate 2025-2026) on basic old-age insurance contributions;

• Employer flat-rate deduction: employers with fewer than 20 employees benefit from a deduction of $1.50 per overtime hour.

These benefits apply to legally worked overtime hours, which presupposes impeccable traceability: signed hour records, detailed pay stubs, documented individual or collective agreements.

Replacement of surcharge by compensatory rest

Article L.3121-33 of the French Labor Code authorizes, under contractual conditions, the replacement of all or part of the salary surcharge with equivalent compensatory rest. This rest, known as "compensatory rest replacement" (RCR), must be taken within the timeframes provided for in the agreement and appear on the pay stub. In this case, overtime hours replaced by rest do not count toward the annual cap.

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Documentary obligations of the employer: traceability and digitalization

Time tracking: a legal obligation

The ruling of the Court of Justice of the European Union of May 14, 2019 (case C-55/18, CCOO v. Deutsche Bank) confirmed the obligation for employers to establish an objective, reliable, and accessible system for measuring the daily working time of each employee. In France, this obligation applies regardless of company size.

Tracking documents can take different forms: paper timesheets, clocking systems, biometric timekeeping systems, or digital HR tools. Whatever solution is chosen, data must be retained for 3 years (article L.3171-3 of the French Labor Code) and must be communicable to the labor inspectorate upon request.

Digitalization of HR documents: a lever for compliance

Digital management of overtime hours — amendments to contracts, signed hourly summaries, agreements on waiving rest days — becomes a standard practice in modern HR departments. The HR electronic signature solution makes it possible to validate these documents in seconds, guaranteeing their evidentiary value before labor courts.

For companies wishing to understand the foundations of this approach, the comprehensive guide to electronic signature is an essential starting point. Documents relating to overtime hours — weekly summaries, temporary amendments, compensatory rest certificates — are well-advised to be electronically signed to guarantee their opposability.

Penalties for non-compliance

Failure to comply with overtime regulations exposes the employer to several types of sanctions:

• Contravention fines: up to $1,500 per affected employee ($4,500 in case of repeat offense) for non-compliance with the cap or failure to pay the surcharge;

• Salary back payments: the employee may claim up to 3 years of back pay before the Labor Court;

• URSSAF adjustment: in case of reclassification of undeclared hours, unpaid social contributions can be claimed with late payment penalties.

Implementing a rigorous tracking system, combined with electronic signing of HR documents compliant with the eIDAS regulation, is the best protection against these risks.

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Special cases and derogatory arrangements

Employees on annual fixed days schedule

Executives and certain non-executives under an annual fixed days schedule (article L.3121-58 of the French Labor Code) are not subject to the standard overtime regime. Their working time is counted in days rather than hours. However, they may benefit from a mechanism for buying back rest days (JRTT) beyond the fixed schedule, with a surcharge of at least 10% provided for in the fixed schedule agreement.

Part-time work and complementary hours

For part-time employees, these are not "overtime hours" but complementary hours that apply. They are capped at 10% of the contractual duration (or 1/3 with a collective agreement) and increased by 10% within the limit of the tenth, then by 25% beyond. This separate regime deserves careful attention when drafting part-time contracts — Certyneo's AI-powered contract generator can help you produce compliant documents incorporating these specific clauses.

Annualization of working time

When a collective agreement provides for modulation or annualization of working time, overtime is no longer calculated weekly but at the end of the annual reference period. Only hours worked beyond 1,607 hours over the year then constitute overtime, which can significantly change the calculation of surcharges and the cap.

Legal framework applicable to overtime hours

The overtime regime is based on a dense legislative and regulatory foundation, articulated between the French Labor Code, the provisions of the General Tax Code, and European jurisprudence.

French Labor Code — Main provisions:

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

• Article L.3121-33: possibility of replacing salary surcharge with equivalent compensatory rest and regulation of contractual rates (floor at 10%);

• Article L.3121-36: legal surcharge rates (25% for the first 8 hours, 50% beyond);

• Article L.3121-38: mandatory compensatory rest counterparts (COR) for hours worked beyond the cap;

• Article D.3121-24: setting of the regulatory annual cap at 220 hours;

• Article L.3171-3: obligation to retain time tracking documents for 3 years;

• Article L.3121-58 and following: regime of annual days-based fixed schedules.

General Tax Code:

• Article 81 quarter of the General Tax Code: income tax exemption within the limit of $7,500 per year on overtime remuneration.

European case law:

• CJEU, May 14, 2019, case C-55/18 (CCOO v. Deutsche Bank SAE): obligation for Member States to require employers to have an objective, reliable, and accessible system for measuring the daily working time of each employee. This decision strengthened traceability obligations in France and throughout the EU.

Evidentiary value of digitalized HR documents: Documents related to overtime hours (amendments, summaries, waivers of rest days) may be validly signed electronically in accordance with Regulation (EU) No. 910/2014 eIDAS, which recognizes the legal effect of electronic signatures in all Member States. Article 25 of the regulation provides that a qualified electronic signature has a legal effect equivalent to a handwritten signature. For common HR documents, an advanced electronic signature (eIDAS level 2) is generally sufficient.

Article 1366 of the French Civil Code provides that "electronic writing has the same probative force as writing on paper, provided that the person from whom it emanates can be duly identified and that it has been established and preserved under conditions designed to guarantee its integrity." Article 1367 clarifies the conditions for validity of electronic signatures under domestic law.

Finally, regarding the processing of data related to time tracking, Regulation (EU) 2016/679 (GDPR) requires employers to base this processing on a legal basis (legal obligation or legitimate interest), inform employees, and limit data retention to the strictly necessary duration.

Usage scenarios: managing overtime hours in practice

Scenario 1 — SME manufacturing with seasonal activity peaks

An SME manufacturing company with approximately 80 employees experiences significant increases in activity at year-end, generating an average of 12 to 15 weekly overtime hours per operator over 6 consecutive weeks. Previously managed manually via paper timesheets, validation of hours by team leaders took an average of 2 additional business days per payroll cycle, with an estimated data entry error rate of 8%.

After deploying a digital HR tool coupled with an electronic signature solution to validate weekly summaries, validation time fell to less than 4 hours. The data entry error rate dropped to less than 1%, and document traceability made it possible to respond within 24 hours to a URSSAF inspection covering 3 previous years. The time savings on payroll preparation is estimated at 30% per cycle, according to sectoral benchmarks from HR software publishers.

Scenario 2 — Engineering consulting firm with mixed fixed-schedule employees

An engineering consulting firm employing 45 consultants, of which 30 are on fixed days and 15 on standard contracts, faced recurring confusion between overtime hours and days exceeding fixed schedule in its payroll documents. This situation generated recurring labor lawsuits, with an average cost of $3,500 per contentious file (fees + back pay).

By structuring its contractual documents — fixed schedule amendments, JRTT buy-back summaries, compensatory rest certificates — using standardized templates and traceable electronic signatures, the firm reduced the number of employee disputes by 70% within 18 months. The clarity of electronically signed, time-stamped, and archived documents proved decisive in litigation before the Labor Court.

Scenario 3 — Healthcare and social services organization with complex scheduling

A healthcare and social services organization employing approximately 250 employees in shift work (nurses, nursing assistants, administrative staff) had to manage overtime hours over annualized reference periods, in accordance with its sectoral agreement. Calculating the trigger thresholds for overtime hours at the end of the period — from 1,607 hours — required burdensome manual reconciliation of clocking data.

Integration of digital time tracking, with automatic generation of annual summaries and electronic signature of synthesis documents by the employee and HR manager, reduced end-of-period processing time from 5 days to less than 24 hours. Data reliability also facilitated the declaration of TEPA exemptions, avoiding estimated adjustments of several thousand dollars on previous years.

Conclusion

Overtime hours constitute an indispensable flexibility lever for businesses, but their management requires absolute rigor: precise calculation of surcharges, respect of annual caps, document traceability, and application of tax and social exemptions within the rules. In 2026, digitalization of HR processes is no longer an option but a necessity to ensure compliance and protect yourself in case of dispute.

Certyneo helps HR teams secure their documents: amendments, hour summaries, compensation agreements — all electronically signed, time-stamped, and archived with legal value compliant with the eIDAS regulation. Gain in efficiency and peace of mind: discover our rates and start for free on Certyneo.