How to Calculate Payroll for a Forfait Jours Employee Hired Mid-Year in France
Why does hiring a forfait jours employee mid-year create payroll calculation difficulties?
The annual day-count arrangement (“forfait annuel en jours”), governed by Articles L.3121-58 et seq. of the French Labour Code, is a working-time arrangement reserved for autonomous executives and certain employees whose working hours cannot be predetermined. When a forfait jours employee is hired during the calendar year or during the reference period, two distinct calculations must imperatively be carried out by the payroll department:
- The proration of remuneration for the first incomplete month of work;
- The proration of the number of days to be worked over the remaining period.
These two operations are governed by strict rules that are often misunderstood, and failure to apply them exposes the employer to salary back-payment claims and to litigation before the labour court (“conseil de prud’hommes”). This article details the mandatory methodology, with supporting formulas and a complete worked example. For an overview of payroll mechanisms, see our complete payroll guide.
What is the mandatory method for prorating the first month’s pay of a forfait jours employee?
Contrary to what some payroll software applies by default, the proration of the first month’s remuneration for a forfait jours employee is performed exclusively on the basis of calendar days. It is strictly prohibited to prorate on the basis of working days (“jours ouvrés”), business days (“jours ouvrables”), or the thirtieth/thirty-first rule.
The applicable formula is as follows:
Month’s pay = Monthly remuneration − (Monthly remuneration ÷ Number of calendar days in the month × Number of calendar days not worked before hiring)
This formula results from the combined application of Articles L.3242-1 (monthly salary standardisation, “mensualisation”) and L.3121-58 et seq. of the French Labour Code. The use of calendar days is justified by the fact that the forfait jours arrangement departs from the hourly measurement of working time: the reference to calendar days is the only one that is neutral and consistent with the very nature of the forfait.
Why are the other proration methods prohibited?
The thirtieth (or thirty-first) rule is a mechanism derived from case law applicable to employees whose working time is measured in hours. Applying it to a forfait jours employee would create an artificial distortion, sometimes favourable, sometimes unfavourable to the employee, depending on the actual number of calendar days in the month of hiring. Likewise, proration on the basis of working or business days is unsuited to the forfait jours, which is based on a count of days worked and rest days over the year, and not on a weekly logic of five or six days.
The French Supreme Court (Cour de cassation) has repeatedly recalled that forfait jours agreements must be interpreted strictly and that any method of calculation not provided for by the applicable collective agreement or by law is liable to be challenged (Cass. soc., 29 June 2011, No. 09-71.107). It is therefore imperative to adhere to the calendar-days method, which alone complies with the legislation.
How to calculate the number of days to be worked over the remaining period after a mid-year hire?
The second calculation concerns determining the number of days the employee must actually work between the hiring date and the end of the reference period (generally 31 December for a period aligned with the calendar year). This operation follows a mandatory five-step method (a → e) which we detail below.
Step (a): determine the calendar days remaining in the period
This involves counting the total number of calendar days between the hiring date (inclusive) and the last day of the reference period (inclusive). For example, for a hire on 15 April with a period aligned with the calendar year, count from 15 April to 31 December, i.e. 261 calendar days.
Step (b): deduct weekly rest days
Next, deduct all Saturdays and Sundays (or the weekly rest days provided for by the collective agreement) falling within the period. Article L.3132-1 of the French Labour Code guarantees a weekly rest of at least 24 consecutive hours, to which the 11 hours of daily rest are added, i.e. 35 consecutive hours. For our example from 15 April to 31 December, one typically identifies 74 days of weekly rest (Saturdays and Sundays).
Step (c): deduct public holidays coinciding with a normally worked day
Only deduct public holidays falling on a normally worked day (generally Monday to Friday). Public holidays falling on a Saturday or Sunday need not be deducted since they are already neutralised in step (b). Articles L.3133-1 and L.3133-7 to L.3133-12 of the French Labour Code set out the list of statutory public holidays. For the period from 15 April to 31 December 2026, one identifies, for example, 6 public holidays falling on a working day (1 May, 8 May, 14 July, Ascension Thursday, 15 August, 1 November, 25 December depending on the year — the exact count depends on the calendar of the year in question).
Step (d): deduct prorated paid leave entitlements
An employee hired mid-year acquires prorated paid leave entitlements pursuant to Article L.3141-1 of the French Labour Code. These entitlements must be estimated and deducted from the number of days to be worked. For an employee hired on 15 April, the entitlements acquired over the remaining reference period are calculated pro rata temporis. If the employee has acquired no paid leave entitlement (first year of employment without carry-over), this step may yield zero, but it must nonetheless be formalised in the calculation.
Step (e): deduct prorated forfait rest days
Rest days linked to the forfait (often referred to as “RTT forfait” or “JNT — jours non travaillés”, non-worked days) must also be prorated in light of the remaining period in the year. The annual number of rest days is derived from the classic formula: 365 days − 104 weekly rest days − X public holidays on working days − 25 paid leave days − 218 days worked = Y rest days. This figure Y is then prorated according to the number of remaining calendar days relative to the total number of calendar days in the period. The result is rounded up to the nearest half-day according to the most protective practices, unless the collective agreement provides otherwise.
Final result and the solidarity day
The number of days to be worked equals: (a) − (b) − (c) − (d) − (e). If the solidarity day (“journée de solidarité”, Article L.3133-7 of the French Labour Code) has not yet been performed for the current period with a previous employer, +1 day must be added to the result obtained. It is for the employer to verify this point upon hiring, by asking the employee for a certificate from their previous employer.
What is the complete worked example for a hire on 15 April with a salary of EUR 4,000 and a 218-day forfait?
Consider the following scenario: an autonomous executive is hired on 15 April 2026 with a gross monthly remuneration of EUR 4,000 and an annual forfait of 218 days over a period aligned with the calendar year (1 January – 31 December).
Calculation of April’s pay
April has 30 calendar days. The employee did not work from 1 to 14 April, i.e. 14 calendar days not worked.
April pay = 4,000 − (4,000 ÷ 30 × 14) = 4,000 − 1,866.67 = EUR 2,133.33
Calculation of the number of days to be worked from 15 April to 31 December
(a) Calendar days from 15 April to 31 December: 261 days
(b) Weekly rest days (Saturdays and Sundays): 74 days
(c) Public holidays on working days (1 May, 8 May, Ascension, 14 July, 15 August, 1 November, 25 December): 7 days (the exact count varies according to the 2026 calendar)
(d) Prorated paid leave entitlements acquired: the employee hired on 15 April has not yet acquired usable paid leave for the current period. We take 0 days (or the number of carried-over days, if applicable).
(e) Prorated forfait rest days: over the full year, the number of rest days is, for example, 10 days. Proration: 10 × (261 ÷ 365) = 7.15 days, rounded to 7.5 days.
Result: 261 − 74 − 7 − 0 − 7.5 = 172.5 days to be worked.
If the solidarity day has not been performed: 172.5 + 1 = 173.5 days.
This calculation must be formalised in a document appended to the employment contract or in an amendment (“avenant”), in order to secure the contractual relationship and enable rigorous monitoring of the day count. Use our forfait jours simulator to automate this calculation.
What are the most common mistakes employers make during this proration?
Disputes relating to the forfait jours in cases of mid-year hiring reveal recurring errors, which we list below, together with the associated legal risks:
1. Using the thirtieth rule for the first month’s pay. This is the most frequent error. It leads to a pay amount different from the correct amount, sometimes in the employee’s favour, sometimes against them. In both cases, the employee may claim a salary back-payment on the basis of Article L.3242-1 of the French Labour Code, with a three-year limitation period (Article L.3245-1).
2. Failing to prorate the rest days. Some employers grant the full annual rest-day entitlement to an employee hired mid-year, which artificially reduces the number of days worked and may cause difficulties in the event of a later departure (adjustment on the final settlement, “solde de tout compte”).
3. Prorating the days to be worked on the basis of working days rather than calendar days. The (a) → (e) method requires starting from calendar days. Starting from working days distorts the entire downstream calculation.
4. Failing to account for the solidarity day. Overlooking the solidarity day is common in cases of mid-year hiring, as the employee has not always performed this day with their previous employer. Article L.3133-7 of the French Labour Code nonetheless requires it to be performed annually.
5. Absence of written formalisation of the calculation. As the forfait agreement is a formal act requiring the employee’s express consent (Cass. soc., 31 January 2012, No. 10-17.593), the proration of the forfait in cases of mid-year hiring must be formalised in writing, ideally in the employment contract or in an amendment.
How to reconcile the forfait jours proration with DSN reporting obligations?
The nominative social declaration (“déclaration sociale nominative”, DSN) requires monthly reporting of the number of days worked by the forfait jours employee. In cases of mid-month hiring, the first DSN must reflect:
- The remuneration prorated in accordance with the formula described above;
- The number of days actually worked over the incomplete month;
- The prorated annual forfait applicable to the employee.
It is essential to verify the payroll software configuration on these three points, as DSN anomalies may trigger requests for explanation from the URSSAF or the supplementary pension fund. To explore forfait jours payroll mechanisms further, see our payroll guide.
What are the applicable reference texts?
The legal framework of the forfait jours in cases of mid-year hiring rests on the following texts:
- Articles L.3121-58 et seq. of the French Labour Code: general regime of the annual day-count forfait;
- Article L.3242-1 of the French Labour Code: monthly salary standardisation;
- Article L.3132-1 of the French Labour Code: weekly rest;
- Article L.3133-1 of the French Labour Code: list of statutory public holidays;
- Articles L.3133-7 to L.3133-12 of the French Labour Code: solidarity day;
- Article L.3141-1 of the French Labour Code: paid leave.
The employer must also refer to the industry-wide or company collective agreement establishing the forfait jours, which may provide for specific proration arrangements, provided they are at least as favourable as the statutory provisions.
FAQ — Frequently asked questions on the payroll of a forfait jours employee hired mid-year
Does calendar-day proration also apply in the event of a mid-month departure?
Yes. The calendar-day proration method is symmetrical: it applies both on arrival and on mid-month departure. The final settlement must be calculated using the same formula, taking into account the number of calendar days actually worked during the last month.
What happens if the employee exceeds the prorated number of days?
If the employee works more days than the prorated forfait, the excess days must be handled in accordance with Article L.3121-59 of the French Labour Code: the employee may, with the employer’s agreement, waive part of their rest days in exchange for a salary increase of at least 10%, formalised by an amendment to the employment contract.
Can the employer apply a different proration method provided for by a collective agreement?
A collective agreement may provide for specific proration arrangements, provided they are at least as favourable as the statutory method. However, calendar-day proration of the first month’s pay remains the only method compliant with Article L.3242-1 of the French Labour Code. The collective agreement cannot derogate from it to the employee’s detriment.
How to handle absences of a forfait jours employee hired mid-year?
Absences following hiring are deducted from the prorated forfait under the same rules as for an employee present throughout the year. Each day of absence (sickness, unpaid leave, etc.) reduces the number of days to be worked by one unit and gives rise to a salary deduction calculated on the basis of the daily salary (monthly remuneration ÷ 21.67 average working days, or according to the applicable collective agreement method).
Must a summary document be provided to the employee?
Article L.3121-65 of the French Labour Code requires the employer to draw up a control document showing the number and dates of the days or half-days worked. In cases of mid-year hiring, this document must state the applicable prorated forfait and the monitoring of days worked from the hiring date.
For any question regarding the payroll management of a forfait jours employee, do not hesitate to contact our firm. You may also use our online forfait jours simulator to obtain an instant calculation.