Introduction: Why Master Exemptions on Overtime Hours?
Overtime hours are a crucial flexibility tool for French companies. In 2026, the exemption system remains particularly advantageous for both employees and employers. However, its implementation in payroll raises numerous questions: what reduction rate should be applied? How to calculate the employer’s flat-rate deduction? How does it interact with other charge reductions? This comprehensive guide, intended for payroll managers and HR directors, details each mechanism based on references from the Official Bulletin of Social Security (BOSS, boss.gouv.fr).
1. The Legal Framework for Overtime Hours in 2026
1.1 Definition and Counting of Overtime Hours
Overtime hours are defined as hours worked beyond the legal weekly duration of 35 hours, or the duration considered equivalent in certain sectors. The counting is done per calendar week, from Monday 00:00 to Sunday 24:00, unless a collective agreement provides for a different seven-day consecutive period.
The annual limit for overtime hours is set at 220 hours per employee, unless different contractual provisions apply. Beyond this limit, mandatory compensatory rest is added to the salary increase. It is essential to clearly distinguish between overtime hours and complementary hours, as the latter only pertains to part-time employees.
1.2 Applicable Increase Rates
In the absence of a collective agreement, the legal increases are as follows:
- 25% for the first 8 weekly overtime hours (from the 36th to the 43rd hour);
- 50% for the subsequent hours (from the 44th hour onward).
A company or branch agreement can set a different increase rate, but it cannot fall below 10%. The increase constitutes the base on which social and tax exemptions are then applied.
1.3 Regulatory Sources
The system is governed by Articles L. 241-17 and L. 241-18 of the Social Security Code, as well as by BOSS, section “Exemptions for Overtime and Complementary Hours” (paragraphs 10 to 320). Employers are encouraged to regularly consult BOSS on boss.gouv.fr for updates.
2. Reduction of Employee Contributions
2.1 Principle of the Reduction
Overtime and complementary hours qualify for a reduction in old-age insurance contributions. This reduction applies to the remuneration paid for these hours, including the increase. It benefits all private sector employees, regardless of the company’s size (BOSS, § 110 and following).
2.2 Calculation of the Reduction Rate
The reduction rate is equal to the sum of the rates for old-age contributions borne by the employee. In 2026, this rate is broken down as follows:
| Contribution | Employee Rate | Base |
|---|---|---|
| Basic capped old-age | 6.90% | Tier 1 (up to 1 PASS) |
| Basic uncapped old-age | 0.40% | Total salary |
| Complementary retirement T1 (Agirc-Arrco) | 3.15% | Tier 1 |
| Complementary retirement T2 (Agirc-Arrco) | 8.64% | Tier 2 |
| CEG T1 | 0.86% | Tier 1 |
| CEG T2 | 1.08% | Tier 2 |
The reduction rate is capped at 11.31%. For an employee whose remuneration does not exceed the social security ceiling (4,005 € per month in 2026), the reduction rate will be the sum of the old-age contribution rates on tier 1, or approximately 11.31%. For an employee whose remuneration exceeds the ceiling, the calculation is done pro-rata of the concerned bases, within the limit of 11.31% (BOSS, § 150).
2.3 Example of Salary Reduction Calculation
Let’s take the case of an employee earning 3,200 € gross per month (below the PASS), working 4 overtime hours in the month at an hourly rate of 25 €:
- Salary for overtime: 4 × 25 € × 1.25 = 125.00 €
- Applicable reduction rate: 11.31%
- Amount of the reduction: 125.00 € × 11.31% = 14.14 €
The employee thus benefits from a reduction of 14.14 € on their old-age contributions for that month.
3. The Employer’s Flat-Rate Deduction
3.1 Amounts and Workforce Thresholds
The employer can benefit from a flat-rate deduction of employer contributions for each overtime hour worked. The amount of this deduction depends on the company’s workforce:
- 1.50 € per overtime hour for companies with fewer than 20 employees;
- 0.50 € per overtime hour for companies with 20 to 249 employees.
Companies with 250 or more employees do not benefit from this flat-rate deduction. The workforce is assessed according to common law rules (average annual workforce, Article L. 130-1 of the CSS). BOSS specifies in paragraphs 200 to 240 the methods for determining the workforce and the rules for exceeding thresholds.
3.2 De Minimis Regime
The employer’s flat-rate deduction is subject to the European de minimis regulation. The company must not have received more than 200,000 € in de minimis aid over the last three fiscal years. The employer must be able to justify compliance with this threshold in the event of an URSSAF audit (BOSS, § 250).
3.3 Example of Employer Deduction Calculation
A company with 15 employees has an employee who works 20 overtime hours in the month:
- Flat-rate deduction: 20 × 1.50 € = 30.00 €
If the same company had 45 employees:
- Flat-rate deduction: 20 × 0.50 € = 10.00 €
The deduction is offset against social security employer contributions due on the salary of the employee concerned, not just on the remuneration for overtime hours.
4. The Particular Case of the Days Worked Under Annual Days Off Scheme
4.1 Principle of Deduction for Employees on Annual Days Off Scheme
Employees on an annualized days-off scheme are not subject to the legal weekly duration of 35 hours. Therefore, they cannot, by definition, work overtime in the traditional sense. However, when an employee on an annualized days-off scheme renounces days off beyond 218 days, those worked days off grant the right to a specific scheme (BOSS, § 270).
4.2 Amount of the Deduction
The employer’s flat-rate deduction is set at 3.50 € per day of renounced leave by the employee. This deduction is also subject to the de minimis regime (200,000 € cap over 3 years) and the same workforce conditions as the hourly deduction.
4.3 Practical Example
A manager on a 218-day scheme renounces 10 days off during the year, increasing their scheme to 228 days. The company (12 employees) benefits from a deduction of:
- 10 × 3.50 € = 35.00 €
The salary increase for these worked days of rest must be at least 10% (Article L. 3121-59 of the Labour Code), or more if provided for by a collective agreement. The reduction in employee contributions also applies to this increase.
5. Cumulative with Other Charge Reductions
5.1 Interaction with General Contribution Reduction (2026 Unique Degressive General Reduction)
The employer’s flat-rate deduction for overtime is cumulative with the general reduction of employer contributions (Article L. 241-13 of the CSS). In practice, the employer can simultaneously apply the general reduction to the entire remuneration and the flat-rate deduction to the overtime hours (BOSS, § 290).
However, the remuneration for overtime and complementary hours is taken into account when calculating the coefficient of the general reduction. This means that overtime hours, by increasing the total remuneration, can decrease the general reduction coefficient and thus the amount of the relief.
5.2 Interaction with Other Schemes
The employee’s reduction on overtime hours accumulates with all schemes exempting employer contributions (ZRR, ZFU, BER, hiring aid, etc.). However, BOSS clarifies that the employer’s flat-rate deduction can only be accumulated with the general reduction and not with zoned or targeted exemptions (BOSS, § 300).
6. Tax Exemption for Overtime Hours
6.1 Exemption Ceiling
Remuneration received for overtime and complementary hours is exempt from income tax up to a maximum of 7,500 € net per year. This ceiling is assessed per employee and per calendar year. It includes both the salary increase and the remuneration for the hours themselves (Article 81 quater of the CGI).
6.2 Calculation of the Net Exempt Amount
The net exempt amount corresponds to the gross remuneration for overtime hours, minus contributions remaining due after applying the salary contributions reduction. Example:
- Gross monthly HS remuneration: 500.00 €
- Remaining employee contributions (CSG/CRDS not exempted, provident, etc.): approximately 50.00 €
- Salary contributions reduction: 500 € × 11.31% = 56.55 €
- Net exempt tax amount: 500.00 € – 50.00 € + 56.55 € ≈ 506.55 €
Over the year, if the employee accumulates 6,000 € net of exempt overtime, they remain below the 7,500 € ceiling, and the entire amount is exempt from income tax.
6.3 Reporting Obligations
The employer must declare the amount of exempt overtime in the DSN (specific section S21.G00.52). The employee finds this amount pre-filled in their income tax return. If the ceiling of 7,500 € is exceeded, the excess is reintegrated into the employee’s taxable income.
7. Complementary Hours of Part-Time Employees
7.1 Eligibility for Exemptions
Complementary hours performed by part-time employees benefit from the same exemptions as overtime hours for full-time employees (BOSS, § 130):
- Reduction of employee contributions (same rate, capped at 11.31%);
- Tax exemption up to 7,500 € net per year.
However, the flat-rate deduction does not apply to complementary hours. Only overtime hours (beyond 35 hours or the contractual duration) grant the right to the employer’s deduction.
7.2 Increase for Complementary Hours
Complementary hours are increased by:
- 10% for hours worked within the limit of 1/10th of the contractual duration;
- 25% for hours worked beyond 1/10th and up to 1/3 of the contractual duration.
7.3 Numerical Example
A part-time employee (28 hours/week) performs 3 complementary hours in the week, at an hourly rate of 15 €:
- 1/10th of 28 h = 2.8 h → 2.8 h increased by 10% and 0.2 h increased by 25%
- HC remuneration: (2.8 × 15 × 1.10) + (0.2 × 15 × 1.25) = 46.20 + 3.75 = 49.95 €
- Salary reduction: 49.95 × 11.31% = 5.65 €
8. Handling in DSN and Points of Vigilance
8.1 Declaration in DSN
In DSN, overtime and complementary hours must be declared with the following specific codes:
- Block S21.G00.51: remuneration with the type “overtime” or “complementary hours”;
- Block S21.G00.52: amount of salary reduction (CTP 003) and the flat-rate employer deduction (CTP 004);
- Block S21.G00.81: net exempt tax amount for income tax.
8.2 Points of Vigilance for Payroll Managers
Several points merit particular attention:
- Compensatory Replacement Leave: When overtime hours are fully compensated by rest, they do not qualify for the salary reduction or the employer deduction (BOSS, § 160).
- Therapeutic Part-Time: Hours worked beyond the reduced contractual duration for medical reasons are indeed complementary hours eligible.
- Multi-Employer Employees: The 7,500 € tax exemption ceiling is assessed globally, across all employers combined.
- URSSAF Control: The employer must be able to justify the number of actually worked overtime hours (time sheets, weekly accounts).
9. Summary: Recap Table of Exemptions for 2025
| Scheme | Beneficiary | Amount / Rate | Conditions |
|---|---|---|---|
| Reduction of employee contributions | Employee | Up to 11.31% | All employers |
| Flat-rate deduction | Employer < 20 employees | 1.50 €/hour | De minimis 200,000 €/3 years |
| Flat-rate deduction | Employer 20-249 employees | 0.50 €/hour | De minimis 200,000 €/3 years |
| Flat-rate deduction for days worked | Employer | 3.50 €/day | Days of renounced leave |
| Tax exemption | Employee | Up to 7,500 € net/year | Overtime and complementary hours |
FAQ: Frequently Asked Questions About Overtime Exemptions
Are structural overtime hours provided in the contract eligible for exemptions?
Yes. As long as these hours are worked beyond the legal duration of 35 hours and paid with the corresponding increase, they qualify for the reduction in employee contributions and the flat-rate deduction, even if they are contractually provided. BOSS does not distinguish between occasional and structural overtime hours (BOSS, § 120).
How to handle overtime hours in case of annualized work time?
In cases of modulation or annualized work time, overtime hours are counted beyond 1,607 annual hours (or the limit set by the agreement). Exemptions apply at the time of regularization at the end of the reference period. Some hours can also be identified during the period if they exceed a defined weekly upper limit set by the agreement (BOSS, § 140).
Is the flat-rate deduction cumulative with ZRR or ZFU exemptions?
No. The flat-rate deduction for overtime is only cumulative with the general reduction of employer contributions (unique degressive general reduction). It cannot be combined with zoned exemptions (ZRR, ZFU, BER) or other targeted exemptions (BOSS, § 300). The employer must choose the most advantageous scheme.
Can an apprentice benefit from the exemptions on overtime hours?
Yes. Overtime carried out by an apprentice qualifies for the reduction of employee contributions under the same conditions as for other employees. The flat-rate deduction also applies if the workforce conditions are met. However, for apprentices whose remuneration is below 50% of the SMIC, as their employee contributions are already exempt, the reduction may be irrelevant (BOSS, § 180).
What happens if the 7,500 € fiscal exemption ceiling is exceeded?
When the net remuneration of overtime and complementary hours exceeds 7,500 € during the calendar year, the excess is reintegrated into the employee’s taxable income. The employer must adjust the declared amount in DSN at the end of the year. The employee will find the correct amount on their pre-filled tax return. The exemptions for social contributions are not affected by this fiscal ceiling; they continue to apply without limit on amounts.