Overtime: Legal Increase and Calculation

Introduction: why master the overtime regime?

Overtime is one of the most sensitive subjects in French labour law. Between calculating mandatory increases, respecting the regulatory annual contingent and social and tax exemptions from the TEPA law, every mistake can prove costly for the employer. In 2025, DIRECCTE (now DREETS) noted that disputes relating to overtime represent approximately 22% of applications to employment tribunals. This article guides you step by step through the legal rules, calculation methods and best practices for formalising agreements in full compliance, in particular through electronic signature in the workplace.

---

The legal framework for overtime in France

Definition and legal trigger

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

Some collective agreements may provide for a different reference duration via an agreement on modulation or annualisation of working time (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, No. 17-16.025) reminds us that hours worked at the sole initiative of the employee, without the employer's request or toleration, cannot be classified as overtime. However, the employee bears the burden of proof for the performance of the hours (time sheets, clocking in, e-mails), whilst the employer must produce contradictory evidence.

The regulatory annual contingent

Article L. 3121-30 of the Labour Code sets an annual overtime contingent 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 mandatory compensatory rest (COR) equal to 50% of hours exceeding the contingent for companies with 20 employees or fewer, and 100% above.

---

Legal increase rates: how to apply them?

Floor 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 15% or 20% rate while remaining above the legal floor.

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

• 25% increase (H36 to H43): 16.48 × 1.25 = £20.60/h

• 50% increase (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 authorises, subject to a collective agreement or, failing that, an individual agreement, the replacement of payment of increased overtime by replacement compensatory rest (RCR). This rest is then granted within a maximum of 18 months following the opening of the right (art. D. 3121-18). Formalising this individual agreement is best done via electronic signature for HR to guarantee traceability and evidential value.

---

Tax and social exemptions: the TEPA scheme and its developments

The exemption scheme in force

Stemming from the law of 21 August 2007 (so-called "TEPA law") and consolidated by law No. 2018-1213 of 24 December 2018, the exemption scheme allows:

• Income tax exemption for the employee on the remuneration of overtime, up to £7,500 per year (art. 81 quater of the General Tax Code).

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

• Employer flat-rate 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 overtime benefiting from exemption 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 error in DSN entry exposes the employer to a social security adjustment, with unpaid contributions being due with default surcharges (art. R. 243-18 of the Social Security Code).

Special case of day-based forfaits

Employees under a convention for annual day forfait (art. L. 3121-58 and following) are not subject to the overtime regime in the strict sense. Their "days of excess" 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, No. 11-14.540) recalls that any day-forfait clause without an effective working time monitoring mechanism is null and void.

---

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

Why sign amendments electronically in relation to overtime?

The multiplication of individual agreements (RCR, hour forfaits, modulation amendments) generates considerable documentary volume. Signing these documents on paper lengthens delays, complicates archiving and weakens proof in case of dispute. Qualified electronic signature compliant with eIDAS offers evidential 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 such as Certyneo allows for automated sending and signing of amendments as soon as the employee exceeds the conventional contingent, centralises evidence of consent and generates a timestamped audit trail. HR managers thus reduce the time taken 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 retention of payslips for 5 years; individual amendments relating to overtime follow the same rule. Electronic archiving with evidential value — in compliance with the NF Z 42-026 standard and the eIDAS regulation — guarantees the enforceable nature of documents in case of social security audit or employment tribunal proceedings. The complete guide to electronic signature details the technical requirements to be met for legally secure archiving.

Legal framework applicable to overtime and its formalisation

Labour Code provisions

The overtime regime is governed by articles L. 3121-28 to L. 3121-48 of the Labour Code, which set the legal reference duration (35 weekly hours), the floor increase rates (25% then 50%), the regulatory annual contingent (220 hours in the absence of agreement) and the terms of mandatory compensatory rest. Articles D. 3121-14 to D. 3121-18 specify the thresholds and regulatory deadlines associated therewith.

Tax and social exemptions

Article 81 quater of the General Tax Code establishes the exemption from income tax up to £7,500 annually. 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 social security adjustment with application of the default surcharges provided for in article R. 243-18 of the same code.

Evidential value of documents signed electronically

Article 1366 of the Civil Code states that "electronic writing has the same evidential force as writing on paper". 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).

Protection of personal data

The collection and processing of data relating to working time (clocking in, time sheets) constitute processing of personal data subject to the GDPR regulation No. 2016/679. The employer, as data controller, must provide a legal basis (legal obligation, art. 6(1)(c)), inform employees (art. 13) and respect retention periods. The use of a SaaS electronic signature solution requires the conclusion of a data processor contract 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 ensures the interoperability and long-term verifiability of signatures appended to HR amendments.

Legal risks in the event of non-compliance

An amendment relating to overtime that is not formalised or for which proof of consent cannot be provided may be reclassified, opening the right to back pay, damages for undeclared work (art. L. 8221-5 of the Labour Code) and criminal sanctions that may reach up to £45,000 fine and 3 years' imprisonment for legal entities.

Usage scenarios: overtime and electronic signature in practice

Scenario 1 — An 80-employee industrial SME in production peak

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

Since the implementation 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 time saving is estimated at 85% reduction in administrative delay, representing savings of approximately 2 FTE/month on the HR function according to ranges observed in ANDRH sectoral reports 2024.

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

An accounting firm centralises payroll processing for approximately 150 SME clients, representing over 900 payslips monthly. Verifying declared overtime and transmitting signed amendments to the right parties was a major friction point: mislaid documents, insufficient signatures, validation delays.

By integrating an electronic qualified signature flow directly into its payroll software, the firm reduced documentary chase-ups by 70% and halved the average time for amendment validation. Timestamped and electronically archived documents also made it possible to successfully defend two employment tribunal cases related to contestations of overtime payment.

Scenario 3 — A distribution group with 400 employees on staggered hours

A food distribution group employs 400 employees spread across several sites, with staggered hours and frequent replacements generating significant weekly overtime. DSN compliance required precisely declaring each tax-exempt hour; any error triggered social security alerts.

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

Conclusion

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

Qualified electronic signature provides a practical response to this challenge: traceability, timestamping, legal archiving and evidential value compliant with the Civil Code and the eIDAS regulation. For HR managers, accountants and SME managers, it is a lever for both compliance and productivity.

Ready to secure your HR amendments relating to overtime? Discover Certyneo's solutions for HR or calculate your return on investment in a few minutes.