Overtime: Legal Increase and Calculation

Introduction: why master the overtime regime?

Overtime is one of the most sensitive subjects in French labour law. Between the calculation of mandatory increases, compliance with the statutory annual contingent and social and tax exemptions resulting from the TEPA law, each error can be costly for the employer. In 2025, the DIRECCTE (now DREETS) noted that disputes related to overtime represent approximately 22% of labour court claims. This article guides you step by step through the legal rules, calculation methods and best practices for formalising agreements in full compliance, notably through electronic signature in business.

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The legal framework for overtime in France

Definition and legal triggering

According to article L. 3121-28 of the Labour Code, overtime constitutes all hours of work performed beyond the statutory weekly duration set at 35 hours. For full-time employees subject to a collective working hours regime, the count is carried out on a weekly basis (Monday 00:00 to Sunday 24:00).

Certain collective agreements may provide for a different reference duration via a time modulation or annualisation agreement (articles L. 3121-41 to L. 3121-47). In this case, overtime is calculated at the end of the period, based on the conventional annual duration (often 1,607 hours).

Employer's order and employee's consent

The performance of overtime is based on an explicit or implicit request from the employer. The Court of Cassation (Soc., 14 November 2018, n°17-16.025) reminds that hours performed at the initiative of the employee alone, without request or tolerance from the employer, cannot be qualified as overtime. However, the burden of proof for the performance of hours rests with the employee (time sheets, time clocks, e-mails), while the employer must produce contradictory evidence.

The statutory annual contingent

Article L. 3121-30 of the Labour Code sets an annual contingent of overtime at 220 hours per employee in the absence of a collective agreement. A company or sectoral agreement may adjust this threshold upwards or downwards. Beyond the contingent:

• The employer must consult the CSE (Social and Economic Committee).

• The employee is entitled to a mandatory rest compensation (COR) equal to 50% of the hours exceeding the contingent for companies with 20 employees or fewer, and 100% beyond that.

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Legal increase rates: how to apply them?

Minimum rates set by law

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

| Hours concerned | Increase rate | |---|---| | 1st to 8th overtime hour (H36 to H43) | 25% | | From the 9th overtime hour (H44 and beyond) | 50% |

A company or sectoral agreement may set a different rate, provided that it is not less than 10% (art. L. 3121-33). This flexibility allows SMEs to negotiate a rate of 15% or 20%, while remaining above the statutory minimum.

Practical calculation method

The gross hourly base salary serves as the reference. For an employee whose gross monthly salary is €2,500:

• Gross hourly rate: €2,500 ÷ 151.67 h = €16.48/h

• Increase at 25% (H36 to H43): 16.48 × 1.25 = €20.60/h

• Increase at 50% (H44 and +): 16.48 × 1.50 = €24.72/h

The monthly reference duration of 151.67 hours corresponds to 35 h × 52 weeks ÷ 12 months.

Replacement of the increase by compensatory rest

Article L. 3121-33 of the Labour Code permits, subject to a collective agreement or, failing that, an individual agreement, the replacement of the payment of increased overtime by a replacement compensatory rest (RCR). This rest is then granted within a maximum period of 18 months following the opening of the right (art. D. 3121-18). The formalisation of this individual agreement is best done via electronic signature for HR to guarantee traceability and probative value.

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Tax and social exemptions: the TEPA regime and its developments

The exemption scheme in force

Arising from the law of 21 August 2007 (known as the "TEPA law") and consolidated by law no. 2018-1213 of 24 December 2018, the exemption scheme allows:

• Exemption from income tax for the employee on the remuneration of overtime, up to a limit of €7,500 per year (art. 81 quater of the General Tax Code).

• Reduction of employee contributions: flat deduction of €1.50 per overtime hour for all employees.

• Employer flat deduction: for companies with fewer than 20 employees, reduction of €0.50 per overtime hour on employer contributions.

Employer's declaration obligations

The employer must declare exempt overtime via the Nominative Social Declaration (DSN), distinguishing on the payslip:

• The number of overtime hours worked.

• The corresponding gross remuneration before exemption.

• The amount of reduced contributions.

A failure to declare or an error in the DSN item exposes the employer to a Social Security Audit Office (URSSAF) adjustment, with unpaid contributions being due with late penalties (art. R. 243-18 of the Social Security Code).

Special case of day forfaits

Employees in a convention for annual forfait in days (art. L. 3121-58 and following) are not subject to the overtime regime in the strict sense. Their "excess days" beyond the conventional forfait (often 218 days) may, however, benefit from an increase if a collective agreement provides for it. The Court of Cassation (Soc., 26 September 2012, n°11-14.540) reminds that any day forfait clause without an effective mechanism for monitoring working time is null and void.

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Formalisation and traceability: the contribution of electronic signature for HR amendments

Why electronically sign amendments related to overtime?

The multiplication of individual agreements (RCR, hour forfait, modulation amendments) generates a substantial documentary volume. Signing these documents on paper lengthens delays, complicates archiving and weakens proof in the event of a dispute. Qualified electronic signature compliant with eIDAS offers probative value equivalent to handwritten signature (art. 1367 of the Civil Code) and guarantees the integrity of the signed document.

Integration into HR processes

A platform like Certyneo allows you to automate the sending and signing of amendments as soon as the employee exceeds the conventional contingent, to centralise evidence of consent and to generate a timestamped audit trail. HR departments thus reduce the time to sign amendments from 5 to 7 working days (paper process) to less than 24 hours on average. To compare the solutions available on the market, consult our comparison of electronic signature solutions.

Legal conservation and archiving

Article L. 3243-4 of the Labour Code requires the preservation of payslips for 5 years; individual amendments relating to overtime follow the same rule. Electronic archiving with probative value — compliant with the NF Z 42-026 standard and the eIDAS regulation — ensures the enforceability of documents in the event of URSSAF inspection or labour court claim. The complete guide to electronic signature details the technical requirements to respect for legally secure archiving.

Applicable legal framework for overtime and its formalisation

Provisions of the Labour Code

The overtime regime is governed by articles L. 3121-28 to L. 3121-48 of the Labour Code, which set the statutory reference duration (35 weekly hours), minimum increase rates (25% then 50%), the statutory annual contingent (220 hours in the absence of an agreement) and the procedures for mandatory rest compensation. Articles D. 3121-14 to D. 3121-18 specify the thresholds and regulatory periods associated.

Tax and social exemptions

Article 81 quater of the General Tax Code sets out the exemption from income tax up to €7,500 annually. The contribution reductions are provided for in article L. 241-18 of the Social Security Code, as amended by law no. 2018-1213 of 24 December 2018. Non-compliance with these provisions exposes the employer to a URSSAF adjustment with the application of late payment penalties provided for in article R. 243-18 of the same code.

Probative value of electronically signed documents

Article 1366 of the Civil Code states that "electronic writing has the same probative force as writing on paper support". Article 1367 specifies the conditions for the reliability of the signature process, referring to the eIDAS regulation no. 910/2014 of the European Parliament and of the Council. This regulation distinguishes three levels of signature: simple, advanced (compliant with the requirements of articles 26 and following) and qualified (based on a qualified certificate issued by an approved trust service provider, known as QTSP).

Personal data protection

The collection and processing of data relating to working time (time clocking, time sheets) constitute processing of personal data subject to the GDPR regulation no. 2016/679. The employer, as the controller, must provide a legal basis (legal obligation, art. 6(1)(c)), inform employees (art. 13) and respect storage periods. The use of a SaaS electronic signature solution involves the conclusion of a data processing agreement compliant with article 28 of the GDPR.

Technical standards

Advanced and qualified electronic signatures are based on the standards ETSI EN 319 132 (XAdES), ETSI EN 319 122 (CAdES) and ETSI EN 319 162 (PAdES) for PDF formats. Compliance with these standards guarantees interoperability and long-term verifiability of signatures affixed to HR amendments.

Legal risks in case of non-compliance

An amendment relating to overtime that is not formalised or whose evidence of consent cannot be provided may be reclassified, opening the right to salary back-pay, damages for concealed work (art. L. 8221-5 of the Labour Code) and criminal penalties of up to €45,000 in fines and 3 years imprisonment for legal persons.

Use cases: overtime and electronic signature in practice

Scenario 1 — An industrial SME of 80 employees at peak production

An SME in the manufacturing sector employs 80 operators subject to significant seasonal variations. Each quarter, about fifty employees exceed 220 hours of the annual contingent, requiring the conclusion of individual amendments providing for compensatory rest. Previously managed on paper, these documents took an average of 6 days to be signed, delaying payroll calculation.

Since the deployment of an advanced electronic signature solution, amendments are automatically generated from the HRIS as soon as the threshold is triggered, sent by mobile notification and signed in less than 4 hours. The estimated time saving represents an 85% reduction in administrative delay, equivalent to an economy of approximately 2 FTEs/month on the HR function according to ranges observed in ANDRH 2024 sectoral reports.

Scenario 2 — An accountancy firm managing payroll for 150 SME clients

An accountancy firm centralises payroll processing for approximately 150 SME clients, representing more than 900 monthly payslips. The verification of declared overtime and the transmission of signed amendments to the right stakeholders represented a major friction point: lost documents, insufficient signatures, validation delays.

By integrating an electronically qualified signature flow directly into its payroll software, the firm reduced the rate of document follow-up by 70% and halved the average time for amendment validation. The timestamped pieces and electronically archived have also made it possible to successfully defend two labour court cases related to disputes over the payment of overtime.

Scenario 3 — A retail group of 400 employees on staggered shifts

A food distribution group employs 400 employees spread across several sites, with staggered hours and frequent replacements generating many hours of weekly overtime. DSN compliance required precise declaration of each exempt hour; any error triggered URSSAF alerts.

By deploying an electronic signature workflow coupled with a time management tool, managers validate hours at the end of the week from their tablet, the employee electronically signs the monthly summary and the data is automatically transmitted to the DSN module. The rate of declaration anomalies dropped from 8% to less than 1% in six months, significantly reducing the risk of URSSAF adjustment.

Conclusion

The overtime regime in France is based on a precise balance: statutory increase rates (25% then 50%), compliance with the annual contingent of 220 hours, tax and social exemptions conditional on rigorous declaration, and formalisation of individual agreements whose proof must be irrefutable. Each step can become a source of dispute if administrative processes are not properly managed.

Qualified electronic signature provides a concrete answer to this challenge: traceability, timestamping, legal archiving and probative value in compliance with the Civil Code and the eIDAS regulation. For HR departments, accountants and SME managers, it is both a compliance and productivity lever.

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