Overtime Hours: Rate Increase and Legal Calculation

Introduction

Overtime hours are at the heart of daily human resources management in France. If miscalculated or incorrectly declared, they expose the employer to URSSAF adjustments, employment tribunal disputes and significant tax penalties. Yet the regulations are precise: the Labour Code sets minimum increase rates, an annual threshold and mandatory counterparts as soon as this threshold is exceeded. This article guides you step by step through the legal calculation of overtime hours, the applicable increase rates based on hours worked, the tax and social exemptions in force, and best documentary practices — notably the dematerialisation of amendments — to secure your HR processes in 2026.

Definition and triggering threshold for overtime hours

What is an overtime hour?

According to Article L. 3121-28 of the Labour Code, overtime hours are all hours of work performed beyond the legal weekly duration, set at 35 hours for full-time employees subject to the common law regime. Hours worked beyond the contractual duration set at 35 hours are also considered overtime when this duration is less than the legal duration — a very rare case — or beyond the duration set by a company agreement.

It is essential to distinguish overtime hours from supplementary hours, specific to part-time employees, whose legal regime and increase rates differ substantially.

The annual overtime threshold

Article L. 3121-33 of the Labour Code provides that a company or sector agreement may set the annual overtime threshold. In the absence of an agreement, the regulatory threshold is set at 220 hours per employee per year (Decree No. 2002-622 of 25 April 2002). Beyond this threshold, the employer must:

• Consult the social and economic committee (CSE) before any recourse to overtime outside the threshold;

• Grant a mandatory rest compensation (COR) of 50% of the hours worked beyond the threshold for companies with 20 employees or fewer, and 100% for companies with more than 20 employees.

Failure to comply with these obligations exposes the employer to criminal penalties under Article L. 3121-44 of the Labour Code, as well as to damages.

Legal increase rates: 25% and 50%

Increase rates according to hour rank

Article L. 3121-36 of the Labour Code establishes the following minimum increases, applicable in the absence of a more favourable collective agreement:

| Rank of overtime hours | Minimum increase rate | |---|---| | From the 36th to the 43rd hour (hours 1 to 8) | 25% | | From the 44th hour (hour 9 and beyond) | 50% |

These rates are legal minimums: a company or sector agreement may increase them, but never below 10% (absolute minimum threshold provided by the same article for companies covered by an agreement). In practice, many collective agreements provide for higher increases (e.g. 30% from the first hour in construction or wholesale trade).

How to calculate the increased remuneration concretely?

The calculation is based on the gross hourly rate of the employee, including elements of remuneration that constitute the base salary within the meaning of Article L. 3141-24 of the Labour Code. Bonuses not linked to work actually performed (flat seniority bonus, expense reimbursement) are generally excluded from the basis.

Calculation formula:

``` Overtime hour remuneration = Hourly rate × (1 + increase rate) ```

Numerical example:

• Monthly gross salary: €2,500 for 151.67 hours (35 h/week basis)

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

• Overtime hour at 25%: €16.48 × 1.25 = €20.60

• Overtime hour at 50%: €16.48 × 1.50 = €24.72

For an employee who worked 5 overtime hours at 25% and 3 hours at 50%, the additional gross amount will be: (5 × €20.60) + (3 × €24.72) = €103 + €74.16 = €177.16 gross.

Tax and social exemptions: the "Macron" scheme in 2026

Exemption from income tax

Since the TEPA law of 21 August 2007 (Article 81 quater of the CGI), remuneration received for overtime hours is exempt from income tax up to €7,500 per year. This ceiling, maintained by the finance law for 2026, applies to the increased remuneration (gross amount corresponding to overtime hours, including the increase).

Reduction in employee social contributions

In parallel, Article L. 241-17 of the Social Security Code institutes a flat deduction of employer contributions for overtime hours. In 2026, this is:

• €1.50 per overtime hour for companies with fewer than 20 employees;

• €0.50 per overtime hour for companies with 20 or more employees.

On the employee side, a reduction of 11.31 percentage points of old-age insurance contributions (2026 rate) applies to overtime remuneration within the limit of the monthly minimum wage multiplied by the number of hours. In practice, for an employee paid at or near the minimum wage, the combination of the two exemptions can make the overtime hour almost cost-neutral for the employer.

DSN declaration and traceability

The exemption is subject to correct declaration in DSN (Nominative Social Declaration). The employer must enter the payment nature code CTP 003 for the employer deduction and use the specific items relating to exempted overtime hours. A failure to declare results in loss of the exemption benefit and may trigger a URSSAF adjustment.

Electronic signature for HR facilitates documentary traceability here: each amendment modifying the duration of work or formalising a recovery agreement can be signed and archived in a reliable manner, which constitutes valuable protection during an inspection.

Replacement of overtime hours with compensatory rest

Compensatory rest for replacement (RCR)

Article L. 3121-33 of the Labour Code allows a company agreement to provide that all or part of the overtime hours and their increases will be replaced by equivalent compensatory rest. This mechanism, known as compensatory rest for replacement (RCR), has a dual advantage:

• For the employer: the hours replaced are not deducted from the annual threshold (Article L. 3121-30);

• For the employee: they recover free time valued at the increased rate (e.g. 1 overtime hour at 25% = 1 hour 15 minutes rest).

The RCR must be formalised by collective agreement or, failing that, with the individual agreement of the employee. The use of an AI contract generator can accelerate the drafting of these amendments while guaranteeing their legal compliance.

Mandatory rest compensation (COR): do not confuse

COR is distinct from RCR: it is due as of right as soon as overtime hours exceed the annual threshold, without necessary agreement. It cannot be monetised except in exceptional cases and must be taken within two months of the right opening (Article D. 3121-18 of the Labour Code). An employee who has not been able to take their COR within this period may seize the employment tribunal.

Formalisation and archiving: HR documentary issues

Obligation to monitor working time

According to the case law of the Court of Justice of the European Union (CJEU, judgment Federación de Servicios de Comisiones Obreras, 14 May 2019, Case C-55/18), employers are required to implement an objective, reliable and accessible system for measuring daily working duration. In French law, this translates into the obligation to keep a weekly or monthly record signed or approved by the employee.

The dematerialisation of these records and associated amendments via an electronic signature solution compliant with the eIDAS regulation guarantees their probative value before social courts. A document electronically signed with a qualified certificate benefits from the presumption of reliability provided in Article 25 of eIDAS Regulation No. 910/2014.

Pay slips and mandatory entries

The pay slip must clearly show (Article R. 3243-1 of the Labour Code):

• The number of overtime hours worked and their increase rate;

• The amount exempt from income tax in respect of overtime hours;

• The flat deduction of employer contributions.

The omission of these entries constitutes an infraction subject to administrative penalties and exposes the employer to the requalification of amounts paid as ordinary salary, with loss of related exemptions. To go further in securing your HR processes, consult our complete guide to electronic signature which details the signature levels suited to different HR documents.

Legal framework applicable to overtime hours

The regulation of overtime hours in France is based on a dense legislative and regulatory body, articulated around the Labour Code, the Social Security Code and tax instructions.

Main reference texts:

• Articles L. 3121-27 to L. 3121-44 of the Labour Code: define the legal working duration, the triggering of overtime hours, the minimum increase rates, the annual threshold, the mandatory rest compensation and the compensatory rest for replacement.

• Articles D. 3121-14 to D. 3121-24 of the Labour Code: clarify the regulatory arrangements of the threshold (220 hours by default), COR and the conditions for opening the right to rest.

• Article 81 quater of the General Tax Code (CGI): exemption from income tax on overtime hour remuneration up to €7,500 annually.

• Article L. 241-17 of the Social Security Code: flat deduction of employer contributions (€1.50 or €0.50 per hour depending on headcount).

• Article R. 3243-1 of the Labour Code: mandatory entries on the pay slip relating to overtime hours.

• CJEU judgment C-55/18 of 14 May 2019: obligation to implement a system for measuring daily working duration.

Legal risks in case of non-compliance:

• URSSAF adjustment: in case of insufficient increase or non-declaration, URSSAF can reinstate the amounts in the contribution basis with application of late-payment increases (5% rate in the first month, then 0.2% per additional month).

• Employment tribunal dispute: the employee may claim the recall of salary corresponding to non-paid overtime hours within three years preceding their claim (three-year limitation for wage recovery, Article L. 3245-1 of the Labour Code), increased by legal interest.

• Criminal penalties: recourse to overtime in breach of provisions relating to the threshold or COR is punished by a class 4 fine (€750 per employee concerned, Article R. 3124-3 of the Labour Code).

• Probative value of documents: to secure evidence in case of dispute, qualified electronic signature within the meaning of eIDAS Regulation No. 910/2014 (European Parliament and Council, 23 July 2014) confers on time records and amendments a presumption of reliability (Article 25 eIDAS) equivalent to that of a digital authentic deed, which considerably strengthens the employer's position before social courts.

Use scenarios: overtime hours and documentary management

Scenario 1 — Industrial SME with 45 employees in peak production phase

An industrial SME employs 45 operators subject to the metallurgy collective agreement. In periods of exceptional orders (Q4), the company must regularly exceed 40 hours per week for 20 to 25 employees. Each week, the HR department had to print, have manually signed and scan amendments to temporary modification of working duration, as well as hour records countersigned by workshop supervisors.

By adopting an eIDAS-compliant electronic signature solution, the company reduced the time to collect signatures from an average of 4.5 days to less than 6 hours, in line with consistent figures from HR digitisation studies (source: ANDRH Barometer 2025). The risk of document loss was eliminated, and time-stamped archiving now constitutes proof that can be opposed in case of URSSAF inspection or employment tribunal dispute.

Scenario 2 — Accounting firm managing payroll for 80 micro-enterprise clients

An accounting firm provides payroll outsourcing for some eighty micro-enterprises, many of which resort to overtime irregularly. The main difficulty: obtaining actual hour data each month from business owners, and having them validate summary pay slips before sending them to employees.

By integrating an electronic validation workflow into its process, the firm reduced follow-up phone calls by 60% and reduced error rates from unstructured email submissions. Automatic traceability of each client validation proved decisive during a tax inspection regarding the income tax exemption for overtime hours of a salaried business owner.

Scenario 3 — Hospital group with approximately 1,200 staff across multiple sites

In the hospital sector, overtime hours for healthcare personnel are regulated by specific provisions of the hospital civil service but private not-for-profit establishments (ESPIC) apply the Labour Code. A group of private clinics with approximately 1,200 staff had to manage, during the post-pandemic period, a record volume of overtime hours exceeding the legal threshold for nearly 30% of its workforce.

The implementation of an electronic signature tool for COR notifications and recovery agreements made it possible to divide by three the time to inform employees of their rest rights, while building a reliable file for each concerned employee. This level of traceability is now recommended by the DREETS as part of their inspections on working duration in healthcare establishments.

Conclusion

The legal calculation of overtime hours is based on precise rules: triggering threshold at 35 hours, minimum increases of 25% for the first eight hours and 50% beyond, annual threshold of 220 hours by default, and mandatory rest counterparts as soon as this threshold is exceeded. In addition to these social obligations are tax issues — income tax exemption up to €7,500 — and strict documentary requirements, strengthened by European case law on working time traceability.

Securing these processes today involves dematerialisation: hour records, amendments, COR notifications and electronically signed pay slips offer a probative value recognised by social courts and inspection bodies. Certyneo allows you to deploy these workflows in a few days, with guaranteed eIDAS compliance. Test Certyneo free of charge or view our pricing to find the formula suited to your organisation's size.