How to Calculate Payroll for a French Forfait Jours Employee Hired Mid-Year

Why does hiring a forfait jours employee mid-year create payroll calculation difficulties?

The annual day-based fixed working arrangement (“forfait annuel en jours”, i.e. an annual set number of working days rather than working hours), governed by Articles L.3121-58 et seq. of the French Labour Code, is a method of organising working time reserved for autonomous executives (“cadres autonomes”) and certain employees whose working time cannot be predetermined. When a forfait jours employee is hired during the course of the calendar year or the applicable reference period, two distinct calculations must be carried out by the payroll department:

The proration of the salary 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 subject to strict rules that are often misunderstood, and failure to comply with them exposes the employer to salary back-payment claims and to litigation before the labour court (“conseil de prud’hommes”). This article sets out 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 the default settings of some payroll software, the proration of the first month’s salary for a forfait jours employee must be carried out exclusively on the basis of calendar days. It is strictly prohibited to prorate on the basis of worked days (“jours ouvrés”), business days (“jours ouvrables”), or the thirtieth or thirty-first rule.

The applicable formula is as follows:

Month’s pay = Monthly salary − (Monthly salary ÷ Number of calendar days in the month × Number of calendar days not worked before the hire date)

This formula results from the combined application of Article L.3242-1 (monthly salary standardisation, i.e. “mensualisation”) and Articles L.3121-58 et seq. of the French Labour Code. The use of calendar days is justified by the fact that the forfait jours 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 arrangement.

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 counted in hours. Applying it to a forfait jours employee would create an artificial distortion, sometimes favourable and sometimes unfavourable to the employee, depending on the actual number of calendar days in the month of hire. Likewise, proration on the basis of worked days 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 held that forfait jours agreements must be strictly interpreted and that any calculation method not provided for by the applicable collective agreement or by law may be challenged (Cass. soc., 29 June 2011, no. 09-71.107). It is therefore imperative to adhere to the calendar-day method, which is the only method consistent with the applicable texts.

How to calculate the number of days to be worked over the remaining period after a mid-year hire?

The second calculation to be carried out concerns determining the number of days the employee must actually work between the hire date and the end of the reference period (generally 31 December where the reference period follows the calendar year). This operation follows a mandatory five-step method (a → e) detailed below.

Step (a): determine the calendar days remaining in the reference period

This involves counting the total number of calendar days between the hire date (inclusive) and the last day of the reference period (inclusive). For example, for a hire on 15 April with a reference period following the calendar year, you count from 15 April to 31 December, i.e. 261 calendar days.

Step (b): deduct weekly rest days

You then 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, you would typically identify 74 days of weekly rest (Saturdays and Sundays).

Step (c): deduct public holidays coinciding with a normally worked day

You deduct only public holidays that fall on a normally worked day (Monday to Friday in general). Public holidays falling on a Saturday or Sunday do not need to 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, you would, for example, identify 6 public holidays falling on a worked 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 during the year accrues 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 accrued over the remaining reference period are calculated on a pro rata temporis basis. If the employee has accrued no paid leave entitlement (first year of employment with no carry-over), this step may yield zero, but it must nonetheless be formalised in the calculation.

Step (e): deduct prorated forfait rest days

The rest days linked to the forfait (often called “RTT forfait” or “JNT — jours non travaillés”, i.e. non-worked days) must also be prorated against the remaining period in the reference year. The annual number of rest days is derived from the classic formula: 365 days − 104 weekly rest days − X public holidays on worked days − 25 paid leave days − 218 worked days = 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 reference period. The result is rounded up to the nearest half-day in accordance with 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 reference period with a previous employer, you should add +1 day to the result obtained. It is for the employer to verify this point at the time of hire, by requesting from the employee a certificate from their previous employer.

What is the complete worked example for a hire on 15 April with a salary of €4,000 and a forfait of 218 days?

Let us take the following scenario: an autonomous executive is hired on 15 April 2026 with a gross monthly salary of €4,000 and an annual forfait of 218 days over a reference period following 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 = €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 (Saturdays and Sundays): 74 days

(c) Public holidays on worked 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 accrued paid leave entitlements: an employee hired on 15 April has not yet accrued usable paid leave for the current reference 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 annexed to the employment contract or in an amendment (“avenant”), in order to secure the contractual relationship and to allow rigorous monitoring of the count of days worked. Use our forfait jours simulator to automate this calculation.

What are the most common mistakes made by employers in this proration?

Litigation relating to the forfait jours in the event of a mid-year hire reveals recurring errors, which we list below along with the associated legal risks:

1. Using the thirtieth rule for the first month’s pay. This is the most common error. It leads to a pay amount different from the correct amount, sometimes in favour of the employee, sometimes to their detriment. In both cases, the employee may claim a salary back-payment on the basis of Article L.3242-1 of the French Labour Code, subject to a three-year limitation period (Article L.3245-1).

2. Failure to prorate rest days. Some employers grant the full annual rest-day allowance 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 worked days rather than calendar days. The (a) → (e) method requires starting from calendar days. Starting from worked days distorts the entire downstream calculation.

4. Failure to account for the solidarity day. Overlooking the solidarity day is common in the case of a mid-year hire, since the employee has not always performed this day with their previous employer. Yet Article L.3133-7 of the French Labour Code requires it to be carried out annually.

5. Absence of a written record 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 the event of a mid-year hire must be recorded in writing, ideally in the employment contract or in an amendment.

How to reconcile forfait jours proration with DSN reporting obligations?

The French nominative social declaration (“déclaration sociale nominative”, DSN) requires the monthly reporting of the number of days worked by a forfait jours employee. In the case of a mid-month hire, the first DSN must reflect:

The salary prorated in accordance with the formula described above;
The number of days actually worked in the incomplete month;
The prorated annual forfait applicable to the employee.

It is essential to verify the payroll software settings on these three points, as DSN anomalies may trigger requests for explanation from URSSAF (the social security collection body) or from the supplementary pension fund. To explore payroll mechanisms relating to the forfait jours further, see our payroll guide.

What are the applicable reference texts?

The legal framework for the forfait jours in the event of a mid-year hire rests on the following texts:

Articles L.3121-58 et seq. of the French Labour Code: general regime of the annual day-based 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 payroll for a forfait jours employee hired mid-year

Does calendar-day proration also apply in the case of a mid-month departure?

Yes. The calendar-day proration method is symmetrical: it applies both to arrival and to departure during the month. The final settlement (“solde de tout compte”) must be calculated using the same formula, taking into account the number of calendar days actually worked in the final 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 return for a salary increase of at least 10%, formalised by an amendment to the employment contract.

May 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, the calendar-day proration of the first month’s pay remains the only method consistent with the provisions of Article L.3242-1 of the French Labour Code. A collective agreement cannot derogate from it to the employee’s detriment.

How to handle the absences of a forfait jours employee hired mid-year?

Absences occurring after the hire are deducted from the prorated forfait under the same rules as for an employee present the entire 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 salary ÷ 21.67 average worked days, or according to the applicable collective agreement method).

Must a summary document be given to the employee?

Article L.3121-65 of the French Labour Code requires the employer to draw up a monitoring document showing the number and dates of the full days or half-days worked. In the case of a mid-year hire, this document must state the applicable prorated forfait and the tracking of days worked from the hire date.

For any question relating to the management of payroll for 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.