Additional hours
AH = max(0, Hw − Hc)
Compare the same week or month.
French part-time additional hours calculator
Calculate the “additional hours” of a part-time employee under French law: one-tenth or one-third limit of contract hours, 10% and 25% statutory premiums or your agreement’s rates, and estimated gross pay.
- France
- Euro
French Labour Code defaults: up to one tenth of contract hours, +10%; between one tenth and one third (if an agreement allows it), +25%. An extended branch agreement may set another rate, never below 10%. Compare hours from the same week or month.
Enter positive values.
Additional hours
- Hours at the first premium
- Hours at the second premium
- Pay for contract hours
- Pay for additional hours
- Of which premiums
- Estimated gross pay
- Calculation
- More than one tenth of contract hours: allowed only if a collective agreement raises the limit to one third (art. L3123-20).
- Beyond one third of contract hours: the maximum for additional hours is exceeded, even with a collective agreement.
- Premium below 10%: no agreement may set less than 10% per additional hour (art. L3123-21).
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How does this tool work?
This calculator applies French employment law. In France, hours worked beyond a part-time contract are “additional hours” (heures complémentaires), not overtime. The Labour Code limits them strictly: without a collective agreement, they cannot exceed one tenth of the contract hours for the week or month; an agreement can raise the limit to one third. Each one carries a premium: 10% within the tenth, 25% between the tenth and the third, unless an extended branch agreement sets another rate of at least 10%. The tool counts additional hours, splits them into the two bands, flags limits that are exceeded and estimates gross pay.
The tool keeps the positive difference between hours worked and contract hours over the same period. The first band covers a percentage of the contract hours, 10% by default (article L3123-29): for a 24-hour contract, 2.4 h. The rest goes into the second band. Each hour is paid at the hourly rate plus its premium. Default example: 24-hour contract, 29 h worked, 15 per hour. The 5 additional hours split into 2.4 h at +10% (39.60) and 2.6 h at +25% (48.75), i.e. 88.35 including 13.35 of premiums; total pay reaches 448.35. As 5 h exceed the tenth (2.4 h), a warning reminds you that an agreement allowing up to one third (8 h) is required.
How to use this tool
Choose the period
The week or the month, depending on how the contract sets hours; a longer period is only possible under a working-time arrangement agreement.
Enter contract hours
For example 24 h a week or 104 h a month.
Enter the hours actually worked
Only the excess counts: below contract hours, the result is zero.
Check bands and premiums
Keep 10% / +10% / +25% without a specific agreement; otherwise use your branch agreement’s rates.
Read the result and warnings
A message flags hours beyond one tenth (agreement needed), beyond one third (not allowed) or a premium below 10%.
Additional hours formulas
Hours beyond the contract are split into two bands, each with its own premium.
Split
B1 = min(AH, Hc × 10%); B2 = AH − B1
B2 is only possible if an agreement allows up to one third, i.e. AH ≤ Hc ÷ 3.
Pay for additional hours
P = r × (B1 × 1.10 + B2 × 1.25)
Statutory default rates; an extended branch agreement may set another rate of at least 10%.
- Hc, Hw
- contract hours and hours actually worked in the period
- B1, B2
- hours at the first and second premium
- r
- gross hourly rate
Use cases
Busy week
30-hour contract, 33 h worked: 3 additional hours, exactly one tenth, all at +10%.
Overrun allowed by agreement
24-hour contract, 29 h worked: 2.4 h at +10% and 2.6 h at +25%, only possible if an agreement allows up to one third.
Checking a French payslip
Find the hours at each rate and the premium amount to compare them with the payslip.
Branch agreement with a single rate
Enter for example 15% in both premiums if your agreement sets that rate for all hours.
Monthly schedule
With a 104-hour monthly contract and 112 h worked, 8 additional hours, all at +10% since one tenth is 10.4 h.
Examples
24-hour contract, 29 h worked
Beyond one tenth: an agreement allowing up to one third is required.
Input
24 h, 29 h, 15/h, 10% / +10% / +25%Result
5 h: 2.4 h at +10% and 2.6 h at +25% · 88.35 including 13.35 of premiums30-hour contract, 33 h worked
One tenth of 30 h is exactly 3 h.
Input
30 h, 33 h, 12/hResult
3 h at +10% · 39.60Tips and best practices
- In France, additional hours cannot bring working time up to the statutory 35 hours, or to a lower agreed full-time duration (article L3123-9).
- You may refuse additional hours requested less than 3 days in advance or beyond the contract limits; it is not misconduct.
- If for 12 consecutive weeks (or 12 weeks out of 15) your average schedule exceeds the contract by at least 2 hours a week, the contract hours are raised accordingly unless you object (article L3123-13).
- Like overtime, French additional hours are exempt from income tax up to an annual limit of €7,500 and benefit from reduced employee contributions.
- A temporary “complément d’heures” amendment allowed by a branch agreement raises contract hours: hours within it are not additional hours, only those beyond it are.
- Always compare hours from the same period: 24 h a week cannot be compared with a monthly total.
- The result is gross: contributions and net pay are not calculated.
Sources and references
- Temps partiel d'un salarié dans le secteur privé (opens in a new tab), Service-Public.frPage in French
- Code du travail, article L3123-28 : limite des heures complémentaires au dixième de la durée contractuelle (opens in a new tab), LégifrancePage in French
- Code du travail, article L3123-20 : heures complémentaires jusqu'au tiers par accord collectif (opens in a new tab), LégifrancePage in French
- Code du travail, article L3123-29 : majoration des heures complémentaires (10 % et 25 %) (opens in a new tab), LégifrancePage in French
- Code du travail, article L3123-9 : les heures complémentaires ne peuvent atteindre la durée légale (opens in a new tab), LégifrancePage in French
- Service-Public.fr — Part-time working hours in France (opens in a new tab)Page in French
Frequently asked questions
What is the difference between additional hours and overtime in France?
Additional hours (heures complémentaires) concern part-time employees working beyond their contract; overtime (heures supplémentaires) concerns full-time employees working beyond 35 hours a week. Limits and premiums differ.
How many additional hours are allowed?
One tenth of the weekly or monthly contract hours without an agreement (article L3123-28), up to one third if a company or branch agreement allows it (article L3123-20). For 24 h, that is 2.4 h or 8 h.
Which premium applies?
By default, 10% for each hour within the tenth and 25% between the tenth and the third (article L3123-29). An extended branch agreement may set another rate of at least 10% (article L3123-21).
Is the 10% premium due from the first hour?
Yes. Since 2014, every additional hour carries a premium, including within the tenth.
What if I reach 35 hours?
Not allowed: additional hours cannot bring a part-time schedule up to the statutory or agreed full-time duration. If the employer needs more hours over time, the contract must be changed.
Can I calculate over a month?
Yes, if the contract sets monthly hours: enter the monthly hours and the hours worked that month. The one-tenth limit then applies to the monthly schedule.
What does “of which premiums” mean?
It is the extra above the normal hourly rate: 2.4 h × 15 × 10% + 2.6 h × 15 × 25% = 13.35 in the default example.
Is the total net pay?
No, it is a gross estimate: contributions, exemptions and income tax withholding are not calculated.
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