Overtime: Increase and Legal Calculation

Introduction: why overtime remains a key issue in 2026

Overtime is one of the most frequently debated topics in French labour law. Between legal obligations, annual quotas, surcharge rates and administrative formalities, employers must navigate a precise regulatory framework on pain of facing significant sanctions. In 2026, with the generalisation of HR document digitalisation, 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, applicable surcharges, the annual quota and best practices for securing your time management.

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Definition and triggering of overtime

What is overtime?

According to article L.3121-28 of the Labour Code, overtime constitutes any hour worked beyond the legal weekly working hours, set at 35 hours for full-time employees. This threshold is assessed on a weekly basis (Monday 0:00 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 contract;

• The hours must be worked at the request of the employer, or at least with their tacit agreement;

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

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

The annual overtime quota

The annual quota is the maximum volume of overtime a employee can work in 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 Labour Code).

Beyond this quota, the employer can still resort to overtime, but only after consulting the CSE (Social and Economic Committee) and subject to respect for mandatory rest compensation (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 and legal surcharge rates

The legal rates applicable in the absence of an agreement

In the absence of a sectoral collective agreement or company agreement, overtime is increased according to the following rates, defined in article L.3121-36 of the Labour Code:

| Hours concerned | Legal surcharge rate | |---|---| | First 8 hours of overtime (36th to 43rd hour) | 25% | | From the 9th hour of overtime (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 the exemptions in force (see below).

Conventional rates: a frequent derogation

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

It is therefore imperative to consult the applicable collective agreement 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 hours of overtime).

• Normal hours (35h): 35 × 12 = €420

• 5 hours of overtime 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

The TEPA law and its successive amendments

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

• Income tax exemption: the remuneration for overtime is exempt from income tax up to €7,500 per year (article 81 quater of the General Tax Code);

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

• Flat-rate employer deduction: employers with fewer than 20 employees benefit from a deduction of €1.50 per overtime hour.

These benefits apply to legally completed overtime, which assumes impeccable traceability: signed hour records, detailed pay slips, documented individual or collective agreements.

Replacement of surcharge with rest compensation

Article L.3121-33 of the Labour Code authorises, subject to conventional conditions, the replacement of all or part of the salary surcharge with equivalent rest compensation. This rest, known as "replacement rest compensation" (RCR), must be taken within the timeframes provided for by the agreement and appear on the pay slip. In this case, the overtime replaced by rest does not count towards the annual quota.

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Employer documentation obligations: traceability and digitalisation

Time tracking: a legal obligation

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

Time tracking documents can take various forms: paper time sheets, clocking systems, biometric time tracking systems or digital HR tools. Whatever solution is chosen, the data must be kept for 3 years (article L.3171-3 of the Labour Code) and be communicable to the labour inspection on request.

Digitalisation of HR documents: a lever for compliance

Digital management of overtime — amendments to contracts, signed time summaries, agreements to waive rest days — is becoming standard practice in modern HR departments. The electronic signature solution for HR allows you to validate these documents in seconds, ensuring their probative value before employment courts.

For companies wishing to understand the foundations of this approach, the comprehensive guide to electronic signature is an essential starting point. Documents related to overtime — weekly summaries, temporary amendments, rest compensation certificates — should be electronically signed to guarantee their enforceability.

Sanctions for non-compliance

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

• Misdemeanour fines: up to €1,500 per employee concerned (€4,500 in case of repeat offence) for failure to respect the quota or failure to pay the surcharge;

• Back pay: the employee can claim up to 3 years of back remuneration before the Employment Tribunal;

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

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

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Special cases and derogatory schemes

Employees on annual days forfait

Managers and some non-managers falling under an annual days forfait (article L.3121-58 of the Labour Code) are not subject to the classic overtime regime. Their working time is counted in days and not in hours. However, they may benefit from a mechanism for buying back rest days (JRTT) beyond the forfait, with a surcharge of at least 10% provided for in the forfait agreement.

Part-time work and supplementary hours

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

Annualisation of working time

When a collective agreement provides for modulation or annualisation of working time, overtime is no longer calculated on a weekly basis 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 alter the calculation of surcharges and the quota.

Legal framework applicable to overtime

The overtime regime is based on a dense legislative and regulatory framework, articulated between the Labour Code, the tax provisions of the General Tax Code and European case law.

Labour Code — Main provisions:

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

• Article L.3121-33: possibility of replacing the salary surcharge with equivalent rest compensation and limiting conventional rates (floor at 10%);

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

• Article L.3121-38: mandatory rest compensation (COR) for hours worked beyond the quota;

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

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

• Article L.3121-58 et seq.: regime of annual days forfait agreements.

General Tax Code:

• Article 81 quater of the General Tax Code: income tax exemption up to €7,500 per year on overtime remuneration.

European case law:

• CJEU, 14 May 2019, case C-55/18 (CCOO v Deutsche Bank SAE): obligation for Member States to impose on employers 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.

Probative value of digitalised HR documents: Documents related to overtime (amendments, summaries, agreements to waive days) can be validly signed electronically in accordance with Regulation (EU) No 910/2014 eIDAS, which recognises the legal value of electronic signature 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 (level 2 eIDAS) is generally sufficient.

Article 1366 of the 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 is established and kept in conditions such as to guarantee its integrity". Article 1367 specifies the conditions for the validity of electronic signature under domestic law.

Finally, with regard to the processing of data related to time tracking, the 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 period.

Usage scenarios: overtime management in practice

Scenario 1 — SME manufacturing with seasonal activity peaks

An SME manufacturing company with around 80 employees experiences significant activity increases towards the end of the year, generating an average of 12 to 15 hours of overtime per week per operator over 6 consecutive weeks. Previously managed manually via paper forms, validation of hours by team leaders took an average of 2 additional working days per pay 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, the validation period 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 URSSAF audit covering 3 previous years. The time saving on pay preparation is estimated at 30% per cycle, according to industry benchmarks from HR software publishers.

Scenario 2 — Engineering consulting firm with mixed forfait employees

An engineering consulting firm with 45 consultants, 30 of whom are on days forfait and 15 on standard contracts, faced recurring confusion between overtime and days beyond the forfait in its payroll documents. This situation generated recurring employment disputes, with an average cost of €3,500 per contentious case (fees + back pay).

By structuring its contractual documents — forfait amendments, JRTT buyback summaries, attestations of rest — using standardised templates and traceable electronic signature, the firm reduced employment disputes by 70% in 18 months. The clarity of electronically signed, time-stamped and archived documents proved decisive in a dispute before the Employment Tribunal.

Scenario 3 — Medical and social association with complex scheduling

A medical and social association employing around 250 employees in shift work (nurses, healthcare assistants, administrative staff) had to manage overtime over annualised reference periods, in accordance with its sectoral agreement. Calculating the thresholds triggering overtime at the end of the period — from 1,607 hours onwards — required a tedious manual reconciliation of time tracking data.

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

Conclusion

Overtime is an indispensable tool for business flexibility, but its management requires absolute rigour: precise calculation of surcharges, respect for the annual quota, document traceability and application of tax and social exemptions in accordance with the rules. In 2026, digitalisation of HR processes is no longer an option but a necessity to ensure compliance and protect yourself in case of dispute.

Certyneo supports HR teams in securing 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 free on Certyneo.