Overtime: rates and calculation

Introduction

Overtime is one of the most frequently misunderstood subjects in French labor law. Yet, incorrect calculation exposes the employer to URSSAF audits, employment tribunal disputes, and significant financial penalties. Whether you are an HR director, SME manager, or payroll officer, understanding precisely the overtime increase rates and their calculation methods is essential. This article details the legal rules in force in 2026, practical formulas, the tax and social deduction regime, and specific conventional requirements to monitor.

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Definition and triggering of overtime hours

What is an overtime hour?

According to Article L. 3121-28 of the French Labor Code, overtime hours are all hours of actual work performed beyond the legal weekly duration, fixed at 35 hours for full-time employees under the general scheme. This rule applies to calendar weeks (Monday 0:00 to Sunday 24:00), unless a company agreement defines another reference period.

It is important to distinguish between:

• Actual overtime hours: genuinely performed beyond 35 hours, with the explicit or implicit agreement of the employer;

• Contractual overtime hours: provided for in the employment contract for employees whose weekly duration is set at 37, 39, or 40 hours, for example.

Annual contingents of overtime hours

The legal contingent of overtime hours is set at 220 hours per year per employee (Article L. 3121-30 of the Labor Code), unless a more favorable collective provision applies. Beyond this contingent, the employer must mandatorily obtain the opinion of the social and economic committee (CSE) and grant a compulsory rest offset (COR) of at least 50% for companies with 20 employees or fewer, and 100% for those with more than 20 employees.

Exceeding this contingent without respecting these obligations exposes the company to prosecution for concealed work. The Certyneo HR solution notably makes it possible to secure amendments related to schedule modifications and work time modulation agreements.

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Overtime increase rates in 2026

The legal reference rate

Article L. 3121-36 of the Labor Code sets the legal overtime increase rate at 25% for the first eight hours beyond the 35-hour weekly duration (that is, from the 36th to the 43rd hour inclusive), and at 50% from the 44th hour onwards.

These rates apply by default in the absence of a collective agreement. They constitute a floor: a sectoral or company agreement may provide for higher rates, but never lower than 10% (absolute floor provided by law).

| Hours concerned | Legal increase rate | |---|---| | 36th to 43rd hour | + 25% | | From the 44th hour onwards | + 50% | | In case of agreement (floor) | + 10% minimum |

Conventional rates: increased vigilance

Many collective agreements provide for different rates. For example:

• Metalworking (national agreement of February 7, 2022): 25% for the first 8 hours, 50% beyond;

• Construction: rates that may vary from 25% to 75% depending on hours and status (ETAM, workers);

• Non-food retail trade: rate of 10% for hours between 35 and 39 hours per derogatory agreement.

It is therefore imperative to consult the applicable collective agreement (identifiable by IDCC code) before any calculation. Failure to comply with the agreement is not opposable to the employer in case of dispute.

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Practical calculation methods

Basic formula for the increased hourly rate

The calculation starts from the basic gross hourly rate (THBB) of the employee. For a monthly-paid employee, the formula is:

THBB = Monthly gross salary ÷ (Monthly work duration in hours)

The monthly reference duration is calculated as follows:

Monthly hours = (35h × 52 weeks) ÷ 12 = 151.67 hours/month

Concrete example: an employee receives a monthly gross salary of €2,200 for 35 hours per week.

• THBB = €2,200 ÷ 151.67 h = €14.51/hour

• 25% increase: 14.51 × 1.25 = €18.14/hour (from the 36th to the 43rd hour)

• 50% increase: 14.51 × 1.50 = €21.77/hour (from the 44th hour onwards)

Case of employees on an hourly rate above 35 hours

For an employee whose contract provides for 39 weekly hours, the 4 weekly additional hours (36th, 37th, 38th, 39th hour) are called structural. They must appear on the pay slip with their increase. The base monthly salary then includes these increased hours in the calculation base.

Hours annualized for 39h: (39h × 52) ÷ 12 = 169 hours/month

Of which 17.33 monthly overtime hours (169 – 151.67 = 17.33 h/month at 25%).

Replacement of payment with compensatory time off

Article L. 3121-33 of the Labor Code authorizes, by collective agreement, the replacement of all or part of the payment of overtime hours (and their increase) by a replacement compensatory rest (RCR). This system is popular in sectors with high overtime volumes (construction, hospitality, manufacturing) because it does not enter the calculation base for social contributions, unlike cash payment.

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Tax and social regime of overtime in 2026

The forfeit tax deduction for employers

Since the TEPA law (2007), overtime hours have benefited from an advantageous tax and social regime. In 2026, the applicable provisions provide:

For the employee:

• Income tax exemption within the limit of €7,500 per year (Article 81 quater of the General Tax Code, renewed by the 2026 Finance Act);

• Reduction of employee contributions (old-age contribution portion): reduction rate set at 11.31% of gross remuneration corresponding to overtime and supplementary hours.

For the employer:

• Forfeit deduction of employer contributions of €1.50 per overtime hour in companies with fewer than 20 employees (deduction maintained in 2026);

• No forfeit deduction for companies with 20 or more employees since 2012.

Overtime hours and the pay slip

The pay slip must clearly show overtime hours, their number, their increase rate, and applicable exemptions. Absence or inaccuracy of these items constitutes an irregularity subject to a fine of €750 per pay slip (Article R. 3246-1 of the Labor Code). To secure document traceability for HR contracts with an hourly rate clause, the use of electronic signature in the workplace ensures the binding nature of HR documents.

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Overtime and work time modulation

Work time arrangement over an extended reference period

The El Khomri Act (2016) and Macron ordinances (2017) strengthened the possibility of arranging work time over a period of up to three years by collective agreement (Article L. 3121-44 of the Labor Code). In this framework, overtime hours are identified only at the end of the reference period, not week by week.

Two conditions apply:

• A company or sectoral agreement must explicitly provide for it;

• The triggering threshold is defined in the agreement (for example, 1,607 annual hours).

This configuration is particularly used in the tourism, healthcare, and agriculture sectors, where activity is cyclical. Document management of these agreements can be dematerialized and electronically signed — see the complete guide to electronic signature to understand the signature levels appropriate for this type of document.

Hour and day forfaits

Hour forfait conventions (over the week, month, or year) allow the employer to pay an employee a lump sum for a volume of hours including pre-identified overtime hours. These conventions must be provided for by a collective agreement and stipulated in the employment contract.

Day forfaits (autonomous senior staff) escape hourly counting but remain subject to daily rest rules (11 hours) and weekly rest (35 consecutive hours). If the number of forfait days is exceeded, additional rest days or supplementary compensation are owed. These forfait amendments require written formalization, which the Certyneo AI contract generator can facilitate in compliance with legal requirements.

Legal framework applicable to overtime hours

The overtime regime is governed by a set of legislative and regulatory texts that must be mastered to ensure social compliance in the company.

French Labor Code (legislative and regulatory sections):

• Article L. 3121-28: definition of overtime hours and triggering beyond the 35-hour legal duration;

• Articles L. 3121-30 to L. 3121-32: annual overtime contingent, compulsory rest offset (COR);

• Article L. 3121-33: possibility to replace payment with a replacement rest offset (RCR) by collective agreement;

• Article L. 3121-36: legal increase rates (25% and 50%), possibility of conventional derogation with a 10% floor;

• Article L. 3121-44: work time arrangement over a multi-week period by agreement;

• Article R. 3246-1: sanctions relating to mandatory pay slip mentions.

General Tax Code (CGI):

• Article 81 quater: income tax exemption for overtime hours within the limit of €7,500 annually.

Law no. 2007-1223 of August 21, 2007 (TEPA law): foundation of the exemption and social contribution reduction system for overtime hours, confirmed and renewed by successive finance acts.

Employer obligations: The employer is required to precisely count the actual working time of each employee (Article L. 3171-2 of the Labor Code) and to make this count available to the labor inspector. In case of URSSAF audit, it is up to the employer to prove that the reported hours are accurate. Failure to count presumes that the hours claimed by the employee are real.

Legal risks:

• URSSAF adjustment for incorrect application of reduction or exemption rates;

• Salary reminder in case of insufficient increase, with a 3-year prescription period for salary claims (Article L. 3245-1 of the Labor Code);

• Concealed work qualification (Article L. 8221-5 of the Labor Code) in case of deliberate absence of counting, exposing to a minimum penalty of 6 months gross salary;

• Damages in case of non-compliance with the contingent and absence of COR.

The preservation of modulation agreements, contracts incorporating forfait clauses, and associated pay slips in an unalterable electronic format constitutes good compliance practice, in line with the requirements of Article 1366 of the Civil Code relating to electronic writing.

Concrete usage scenarios

Scenario 1 — Industrial SME of 45 employees with recurring overtime

An SME in the precision mechanics sector employs 45 operators and technicians. Each year, between September and January, the production load requires on average 6 weekly overtime hours per employee. The company had until now applied a flat 25% rate to all hours, without distinguishing hours beyond the 43rd weekly hour.

Following a URSSAF audit, the inspector identifies that hours performed beyond the 43rd hour should have been increased by 50%. The adjustment covers 3 years of payroll, representing a sum approaching €38,000 in contributions and late payment penalties. By implementing an hourly counting system and dematerializing schedule modification amendments via electronic signature, the company now secures traceability of signed agreements and reduces its risk of adjustment.

Scenario 2 — Accounting firm with 18 employees

An accounting firm manages payroll for dozens of small and medium-sized client companies. During the tax period (March–June), firm employees perform between 8 and 12 weekly overtime hours. The firm has concluded a company agreement providing for a derogatory rate of 10% for the first 8 hours and 25% beyond.

By implementing an annual hour system combined with automatic amendment generation via an AI contract generator, the firm reduces administrative processing time for contract modifications by 60%. Savings on payroll related to replacement by rest offset represent approximately 12% of seasonal salary costs.

Scenario 3 — Personal services company with work time arrangement

A personal care services organization employing 90 caregivers applies a 12-month modulation agreement. In peak summer season, some employees exceed 45 hours per week, while in low season they work only 25 hours. At the end of the annual reference period, the count shows 180 overtime hours for 30% of employees.

The company had initially failed to calculate increases based on hours performed beyond the 43rd hour during peaks. After support from a specialized HR firm, it restructures its monitoring system and dematerializes all work time arrangement contracts. The use of Certyneo HR solution allows it to centralize signatures and maintain a time-stamped history of agreements, essential in case of employment dispute.

Conclusion

The calculation of overtime hours is based on precise rules: legal rates of 25% and 50%, annual contingent of 220 hours, tax exemption capped at €7,500, and employer forfeit deduction in small businesses. Failure to understand these rules — notably conventional rates — exposes the employer to costly adjustments and employment disputes over a 3-year prescription period. Dematerialization of HR documents related to work time (amendments, modulation agreements, forfaits) is today an essential compliance lever.

Certyneo supports you in securing your HR documents through an eIDAS-compliant electronic signature solution, simple to implement and adapted to SMEs as well as large groups. Discover our pricing and start for free or test the ROI calculator to measure concrete gains for your organization.