Introduction: Why Master Overtime Exemptions?
Overtime hours are a crucial lever for flexibility for French businesses. In 2025, the exemption system remains particularly advantageous for both employees and employers. However, implementing it in payroll raises many questions: what salary reduction rate should be applied? How to calculate the employer’s flat-rate deduction? How does this interact with other exemptions? This complete guide, aimed at 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 in 2025
1.1 Definition and Counting of Overtime Hours
Overtime hours are considered to be the hours worked beyond the legal weekly duration of 35 hours, or the duration deemed equivalent in certain sectors. Counting is done by civil week, from Monday 00:00 to Sunday 24:00, unless a collective agreement provides for another seven-day period.
The annual quota of overtime hours is set at 220 hours per employee unless different contractual provisions apply. Beyond this quota, mandatory time-off in compensation must be granted in addition to salary increases. It is essential to distinguish clearly between overtime hours and additional hours, the latter applying only to part-time employees.
1.2 Applicable Premium 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 subsequent hours (from the 44th hour onward).
A company or branch agreement may establish a different premium rate, but it cannot fall below 10%. The premium serves as the base on which social and tax exemptions are subsequently applied.
1.3 Regulatory Sources
The system is regulated by Articles L. 241-17 and L. 241-18 of the Social Security Code, as well as the BOSS, section “Exemptions for Overtime and Additional Hours” (paragraphs 10 to 320). Employers are encouraged to regularly consult the BOSS at boss.gouv.fr for updates.
2. Reduction of Employee Contributions
2.1 Principle of Reduction
Overtime and additional hours entitle employees to a reduction in old-age insurance contributions. This reduction applies to the remuneration paid for these hours, including the premium. It benefits all employees in the private sector, regardless of the company’s size (BOSS, § 110 and following).
2.2 Calculation of the Reduction Rate
The reduction rate equals the sum of the old-age insurance contribution rates actually borne by the employee. In 2025, this rate breaks down as follows:
| Contribution | Employee Rate | Base |
|---|---|---|
| Capped basic old-age insurance | 6.90% | Tier 1 (up to 1 PASS) |
| Uncapped basic old-age insurance | 0.40% | Entire salary |
| Supplemental retirement Tier 1 (Agirc-Arrco) | 3.15% | Tier 1 |
| Supplemental retirement Tier 2 (Agirc-Arrco) | 8.64% | Tier 2 |
| CEG Tier 1 | 0.86% | Tier 1 |
| CEG Tier 2 | 1.08% | Tier 2 |
The reduction rate is capped at 11.31%. For an employee whose salary does not exceed the Social Security ceiling (€3,925 per month in 2025), the reduction rate will be the sum of the old-age contribution rates on Tier 1, approximately 11.31%. For an employee whose salary exceeds the ceiling, the calculation is done pro rata based on the applicable bases, capped at 11.31% (BOSS, § 150).
2.3 Example of Salary Reduction Calculation
Consider an employee earning €3,200 gross monthly (below the PASS) who works 4 overtime hours in the month at an hourly rate of €25:
- Overtime remuneration: 4 × 25 € × 1.25 = €125.00
- Applicable reduction rate: 11.31%
- Reduction amount: 125.00 € × 11.31% = €14.14
The employee thus benefits from a reduction of €14.14 on their old-age insurance contributions for that month.
3. Employer’s Flat-Rate Deduction
3.1 Amounts and Employee Count Thresholds
The employer can benefit from a flat-rate deduction of employer contributions for each hour of overtime worked. The amount of this deduction depends on the size of the company:
- €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 are not eligible for this flat-rate deduction. The employee count is assessed according to common law criteria (average annual headcount, Article L. 130-1 of the CSS). The BOSS specifies in paragraphs 200 to 240 the methods for determining the employee count and the rules for crossing thresholds.
3.2 De Minimis Regime
The employer’s flat-rate deduction is subject to the European regulation de minimis. 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 demonstrate compliance with this ceiling in the event of an URSSAF audit (BOSS, § 250).
3.3 Example of Employer Deduction
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 this same company had 45 employees:
- Flat-rate deduction: 20 × 0.50 € = €10.00
The deduction is applied against the employer’s social security contributions owed for all of the employee’s remuneration, not only for the overtime remuneration.
4. Special Case of Employees on Day Packages
4.1 Principle of Deduction for Employees on Day Packages
Employees on annualized day packages are not subject to the legal weekly duration of 35 hours. Therefore, they cannot, by definition, perform overtime in the conventional sense. However, when an employee on a day package renounces days off beyond 218 days, these worked days open the right to a specific system (BOSS, § 270).
4.2 Amount of the Deduction
The employer’s flat-rate deduction is set at €3.50 per renounced day off. This deduction is also subject to the de minimis regime (ceiling of €200,000 over 3 years) and the same employee count conditions as the hourly deduction.
4.3 Practical Example
An executive on a package of 218 days renounces 10 days off in the year, bringing their package to 228 days. The company (12 employees) benefits from a deduction of:
- 10 × 3.50 € = €35.00
Salary increases for these worked days off must be at least 10% (Article L. 3121-59 of the Labour Code), or more if provided for in a collective agreement. The reduction of employee contributions also applies to this increase.
5. Accumulation with Other Contribution Reductions
5.1 Coordination with General Contribution Reduction (Formerly Fillon Reduction)
The employer’s flat-rate deduction for overtime is cumulable 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 all remuneration and the flat-rate deduction for overtime (BOSS, § 290).
However, the remuneration for overtime and additional hours is included in the calculation of the general reduction coefficient. This means that overtime hours, by increasing total remuneration, may decrease the general reduction coefficient and thus the amount of relief.
5.2 Coordination with Other Systems
The salary reduction for overtime accumulates with all systems of exemption from employer contributions (ZRR, ZFU, BER, hiring aid, etc.). However, the BOSS clarifies that the flat-rate employer deduction may only accumulate with the general reduction and not with zoned or targeted exemptions (BOSS, § 300).
6. Tax Exemption for Overtime
6.1 Exemption Ceiling
Remuneration received for overtime and additional hours is exempt from income tax up to €7,500 net per year. This ceiling applies 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 Net Exemption Amount
The net amount exempt from tax corresponds to the gross remuneration for overtime, decreased by the employee contributions that remain due after applying the employee contribution reduction. Example:
- Monthly gross overtime remuneration: €500.00
- Remaining employee contributions (non-exempt CSG/CRDS, insurance, etc.): approximately €50.00
- Employee contribution reduction: €500 × 11.31% = €56.55
- Net tax-exempt amount: €500.00 – €50.00 + €56.55 ≈ €506.55
Annually, if the employee accumulates €6,000 net in 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 report the amount of exempt overtime in the DSN (specific section S21.G00.52). The employee finds this amount pre-filled in their income tax declaration. If the €7,500 ceiling is exceeded, the excess is reintegrated into the employee’s taxable income.
7. Additional Hours for Part-Time Employees
7.1 Eligibility for Exemptions
Additional 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 within the limit of €7,500 net per year.
However, the flat-rate employer deduction does not apply to additional hours. Only overtime (beyond 35 hours or the contractual duration) grants the right to the employer deduction.
7.2 Increase for Additional Hours
Additional 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 up to 1/3 of the contractual duration.
7.3 Numerical Example
A part-time employee (28 hours/week) works 3 additional 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%
- Remuneration for additional hours: (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. Treatment in DSN and Points of Vigilance
8.1 Declaration in DSN
In DSN, overtime and additional hours must be declared with the following specific codes:
- Block S21.G00.51: remuneration with the type “overtime” or “additional hours”;
- Block S21.G00.52: amount of employee contribution reduction (CTP 003) and the flat-rate employer deduction (CTP 004);
- Block S21.G00.81: net tax-exempt amount for income tax.
8.2 Points of Vigilance for Payroll Manager
Several points require careful attention:
- Compensatory time off: when overtime is fully compensated by time off, they do not entitle to the employee contribution reduction or the employer deduction (BOSS, § 160).
- Therapeutic part-time: hours worked beyond the reduced contractual duration for medical reasons are indeed additional hours eligible.
- Multiple employers: the €7,500 tax exemption ceiling is assessed globally, across all employers combined.
- URSSAF control: the employer must be able to justify the actual number of overtime hours worked (time records, weekly counts).
9. Summary: Recap Table of Exemptions for 2025
| System | Beneficiary | Amount / Rate | Conditions |
|---|---|---|---|
| Employee Contribution Reduction | Employee | Up to 11.31% | All employers |
| Flat-Rate Employer Deduction | Employer < 20 employees | €1.50/hour | De minimis €200,000/3 years |
| Flat-Rate Employer Deduction | Employer 20-249 employees | €0.50/hour | De minimis €200,000/3 years |
| Flat-Rate Deduction for Days Off | Employer | €3.50/day | Renounced days off |
| Tax Exemption | Employee | Up to €7,500 net/year | Overtime and additional hours |
FAQ: Frequently Asked Questions on Overtime Exemptions
Are structural overtime hours planned 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 premium, they are entitled to the employee contribution reduction and the flat-rate employer deduction, even if they are contractually provided. The BOSS does not distinguish between occasional and structural overtime hours (BOSS, § 120).
How to handle overtime in the case of annualized working time?
In the case of modulation or annualization of working time, overtime is 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 may also be identified during the period when they exceed a specified weekly limit set by the agreement (BOSS, § 140).
Is the flat-rate employer deduction cumulative with ZRR or ZFU exemptions?
No. The flat-rate employer deduction for overtime is only cumulative with the general reduction of employer contributions (formerly Fillon reduction). It does not accumulate with zoned exemptions (ZRR, ZFU, BER) or other targeted exemptions (BOSS, § 300). The employer must choose the most advantageous system.
Can an apprentice benefit from exemptions on overtime?
Yes. Overtime performed by an apprentice entitles them to the employee contribution reduction under the same conditions as other employees. The flat-rate employer deduction is also applicable if the employee count conditions are met. However, for apprentices earning less than 50% of the minimum wage, since employee contributions are already exempted, the reduction may become irrelevant (BOSS, § 180).
What happens if the €7,500 tax exemption ceiling is exceeded?
When the net remuneration from overtime and additional hours exceeds €7,500 over the calendar year, the excess is reintegrated into the employee’s taxable income. The employer must adjust the declared amount in the DSN at year-end. The employee sees the correct amount reflected in their pre-filled declaration. The social contribution exemptions are not affected by this tax ceiling; they continue to apply without limit.