Overtime Hours: 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 caps, enhancement rates and administrative formalities, employers must navigate a precise regulatory framework or risk significant sanctions. In 2026, with the generalisation of digitised 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, applicable enhancements, the annual cap and best practices for documenting and securing 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 Labour Code, an overtime hour is any hour worked beyond the legal weekly working duration, set at 35 hours for full-time employees. This threshold is assessed on a weekly basis (from 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 have a full-time contract;

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

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

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

The annual overtime cap

The annual cap is the maximum volume of overtime hours an 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 French Labour Code).

Beyond this cap, the employer may still resort to overtime, but only after consulting the Works Council (CSE) and subject to compliance with mandatory rest compensations (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 enhancement rates

The legal rates applicable in the absence of an agreement

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

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

These rates apply to the gross hourly base salary of the employee. The remuneration thus enhanced is fully subject to social contributions and income tax, subject to tax and social exemptions in force (see below).

Conventional rates: a frequent exception

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

It is therefore essential to consult the collective agreement applicable to 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).

• Normal hours (35h): 35 × 12 = £420

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

• Total gross weekly pay: £495

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

TEPA law and subsequent amendments

Since the law of 21 August 2007 known as the "TEPA law", overtime hours have benefited from favourable tax and social treatment, reconfirmed and strengthened by the law of 24 December 2018 on emergency economic and social measures. In 2026, this scheme remains in force:

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

• Reduction in employee social contributions: employees benefit from a flat deduction of 11.31% (updated 2025-2026 rate) on basic old-age 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 hours, which presupposes impeccable traceability: signed hour records, detailed payslips, documented individual or collective agreements.

Replacement of enhancement by compensatory rest

Article L.3121-33 of the French Labour Code permits, subject to contractual conditions, the replacement of all or part of the salary enhancement by equivalent compensatory rest. This rest, known as "compensatory replacement rest" (CRR), must be taken within the time limits provided for in the agreement and shown on the payslip. In this case, the overtime replaced by rest does not count towards the annual cap.

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Employer documentary obligations: traceability and digitisation

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 implement an objective, reliable and accessible system for measuring the daily working hours of each employee. In France, this obligation applies regardless of company size.

Tracking documents can take different forms: paper timesheets, clocking systems, biometric access control systems or digital HR tools. Whatever solution is chosen, the data must be kept for 3 years (Article L.3171-3 of the French Labour Code) and be available to the labour inspectorate upon request.

Digitisation of HR documents: a lever for compliance

Digitised management of overtime — amendments to contract, hour recaps, 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, guaranteeing their evidential value before labour 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 — weekly recaps, temporary amendments, attestations of compensatory rest — would benefit from electronic signature to guarantee their enforceability.

Penalties for non-compliance

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

• Regulatory fines: up to £1,500 per affected employee (£4,500 in case of repeat offence) for failure to respect the cap or failure to pay the enhancement;

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

• Social security authority recovery: in case of reclassification of undeclared hours, unpaid social contributions can be claimed with late payment increases.

Setting up 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 daily forfeit

Executives and certain non-executives subject to an annual daily forfeit (Article L.3121-58 of the French Labour 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 forfeit, with an enhancement of at least 10% provided for in the forfeit agreement.

Part-time work and complementary hours

For part-time employees, these are not "overtime hours" but complementary hours. They are capped at 10% of contractual duration (or 1/3 with a collective agreement) and enhanced by 10% up to the tenth, then by 25% beyond. This distinct regime deserves particular care when drafting part-time contracts — the AI contract generator from Certyneo 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 in the year then constitute overtime, which can significantly alter the calculation of enhancements and the cap.

Legal framework applicable to overtime hours

The overtime regime is based on a dense legislative and regulatory framework, articulated between the Labour Code, tax provisions of the French 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 salary enhancement with equivalent compensatory rest and framework for conventional rates (10% floor);

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

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

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

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

• Article L.3121-58 et seq: regime for annual daily forfeit agreements.

French Tax Code:

• Article 81 quater: 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 hours of each employee. This decision strengthened traceability obligations in France and throughout the EU.

Evidential value of digitised HR documents: Documents related to overtime (amendments, recaps, agreements to waive rest 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 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 is established and kept in such a way as to guarantee its integrity". Article 1367 clarifies the validity conditions for electronic signature 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), to inform employees and to limit data retention to the strictly necessary duration.

Usage scenarios: managing overtime in practice

Scenario 1 — Small industrial company with seasonal activity peaks

A small industrial company of around 80 employees experiences significant activity increases at year-end, generating an average of 12 to 15 overtime hours 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 payroll cycle, with an estimated data entry error rate of 8%.

Following deployment of a digital HR tool coupled with an electronic signature solution to validate weekly recaps, validation time fell to less than 4 hours. The data entry error rate dropped to less than 1%, and document traceability enabled a response within 24 hours to a social security authority inspection covering 3 previous years. The time saving on payroll preparation is estimated at 30% per cycle, according to sector benchmarks from HR software publishers.

Scenario 2 — Engineering consultancy with mixed-forfeit employees

An engineering consultancy employing 45 consultants, of which 30 are on daily forfeit and 15 have standard contracts, faced recurring confusion between overtime and forfeit overage days in its payslips. This situation generated recurrent employment disputes, with an average cost of £3,500 per contentious file (fees + back pay).

By structuring its contractual documents — forfeit amendments, rest day buy-back recaps, attestations of rest — using standardised templates and traceable electronic signature, the firm reduced employment disputes by 70% over 18 months. The clarity of electronically signed, time-stamped and archived documents proved decisive in a dispute before the Labour Court.

Scenario 3 — Healthcare organisation with complex scheduling

A healthcare organisation employing around 250 employees on shift work (nurses, care assistants, administrative staff) had to manage overtime on annualised reference periods, in accordance with its sectoral agreement. Calculating the thresholds triggering overtime at the end of the period — from 1,607 hours — required tedious manual reconciliation of clocking data.

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

Conclusion

Overtime constitutes an indispensable lever of flexibility for companies, but its management requires absolute rigour: precise calculation of enhancements, respect for the annual cap, document traceability and application of tax and social exemptions according to the rules. In 2026, digitisation of HR processes is no longer an option but a necessity to guarantee compliance and protect yourself in case of dispute.

Certyneo supports HR teams in securing their documents: amendments, hour recaps, 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 get started free on Certyneo.