How to Calculate the Salary of an Employee on a Day Rate Hired Mid-Year
Why Does Hiring an Employee on a Day Rate Mid-Year Present Salary Calculation Difficulties?
The annual day rate, governed by articles L.3121-58 and following of the French Labour Code, is a work time arrangement reserved for autonomous executives and certain employees whose working hours cannot be predetermined. When an employee on a day rate is hired mid-calendar year or during the reference period, two separate calculations must be carried out by the payroll department:
- Prorating the compensation for the first incomplete month of work;
- Prorating the number of days to be worked for the remaining period.
These two operations follow strict rules, often misunderstood, and ignorance exposes the employer to salary back payments and disputes before the labour tribunal. This article details the mandatory methodology, including formulas and a complete numerical example. For an overview of payroll mechanisms, see our complete payroll guide.
What is the Mandatory Method for Prorating the Salary of the First Month of an Employee on a Day Rate?
Contrary to what some payroll software may default to, the prorating of the salary for the first month of an employee on a day rate is done exclusively by calendar days. It is strictly prohibited to use a prorating method based on working days, business days, the thirtieth rule, or the thirty-first rule.
The applicable formula is as follows:
Salary for the month = Monthly compensation − (Monthly compensation ÷ Number of calendar days in the month × Number of calendar days not worked before hiring)
This formula stems from the combined application of articles L.3242-1 (monthly salary) and L.3121-58 and following of the French Labour Code. The reference to calendar days is justified by the fact that the day rate deviates from the hourly accounting of working time: referring to calendar days is the only neutral method that conforms to the very nature of the day rate.
Why Are Other Methods of Proration Prohibited?
The thirtieth (or thirty-first) rule is a mechanism derived from case law applicable to employees whose working time is calculated in hours. Applying it to an employee on a day rate would create an artificial distortion, sometimes favorably, sometimes unfavorably, to the employee based on the actual number of calendar days in the month of hiring. Similarly, prorating based on working days or business days is unsuitable for a day rate, which relies on an accounting of working days and days off throughout the year, rather than on a weekly basis of five or six days.
The Court of Cassation has repeatedly stated that day rate agreements must be interpreted strictly and that any calculation modality not provided for in the applicable collective agreement or by law is liable to be challenged (Cass. soc., June 29, 2011, n° 09-71.107). It is therefore imperative to adhere to the calendar day method, which is the only one compliant with the texts.
How to Calculate the Number of Days to Work for the Remaining Period After a Mid-Year Hiring?
The second calculation concerns the determination of the number of days that the employee will actually have to work between their hiring date and the end of the reference period (generally December 31 for a calendar year). This operation follows a mandatory five-step method (a → e) which we detail below.
Step (a): Determine the Remaining Calendar Days for the Period
Count the total number of calendar days from the hiring date (inclusive) to the last day of the reference period (inclusive). For example, for a hiring date of April 15 with an exercise aligned to the calendar year, count from April 15 to December 31, totaling 261 calendar days.
Step (b): Deduct Weekly Days Off
Next, deduct all Saturdays and Sundays (or the weekly rest days as specified by the collective agreement) included in the period. Article L.3132-1 of the French Labour Code guarantees a weekly rest of at least 24 consecutive hours, plus an additional 11 hours of daily rest, totaling 35 consecutive hours. For our example of April 15 to December 31, we typically identify 74 days of weekly rest (Saturdays and Sundays).
Step (c): Deduct Public Holidays Coinciding with Normally Worked Days
Only deduct public holidays that fall on a day typically worked (generally Monday to Friday). Public holidays falling on a Saturday or Sunday do not have to be deducted since they are already neutralized in step (b). Articles L.3133-1 and L.3133-7 to L.3133-12 of the French Labour Code establish the list of legal public holidays. For the period from April 15 to December 31, we might identify 6 public holidays falling on weekdays (May 1, May 8, July 14, Ascension Thursday, August 15, November 1, December 25, depending on the year — the exact count depends on the calendar of the relevant year).
Step (d): Deduct Prorated Paid Leave Rights
The employee hired mid-year acquires prorated paid leave rights under article L.3141-1 of the French Labour Code. These rights must be estimated and deducted from the number of days to work. For an employee hired on April 15, the rights acquired over the remaining reference period are calculated on a pro-rata basis. If the employee has not yet acquired any rights to paid leave (first year of hire without carryover), this step may yield zero, but it must still be documented in the calculation.
Step (e): Deduct Prorated Days Off from the Day Rate
The days off associated with the day rate (often called “RTT forfait” or “JNT — non-working days”) must also be prorated relative to the remaining period of the exercise. The annual number of days off is derived from the classic formula: 365 days − 104 weekly rests − X public holidays on weekdays − 25 paid leave days − 218 worked days = Y days off. This figure, Y, is then prorated based on the number of calendar days remaining relative to the total number of calendar days for the exercise. The result is rounded up to the nearest half-day according to the most protective practices, unless otherwise stipulated by the collective agreement.
Final Result and Day of Solidarity
The number of days to work is equal to: (a) − (b) − (c) − (d) − (e). If the day of solidarity (article L.3133-7 of the French Labour Code) has not yet been conducted in the reference exercise with a previous employer, it is necessary to add +1 day to the result obtained. It is the employer’s responsibility to verify this point at the time of hiring by requesting a statement from the employee’s previous employer.
What is the Complete Numerical Example for a Hiring on April 15 with a Salary of 4,000 Euros and a Day Rate of 218 Days?
Let’s consider the following hypothesis: an autonomous executive is hired on April 15, 2026, with a gross monthly salary of €4,000 and an annual day rate of 218 days over an exercise aligned to the calendar year (January 1 – December 31).
Calculation of the Salary for April
April has 30 calendar days. The employee did not work from April 1 to April 14, totaling 14 calendar days not worked.
Salary for April = 4,000 − (4,000 ÷ 30 × 14) = 4,000 − 1,866.67 = €2,133.33
Calculation of the Number of Days to Work from April 15 to December 31
(a) Calendar days from April 15 to December 31: 261 days.
(b) Weekly rest days (Saturdays and Sundays): 74 days.
(c) Public holidays on weekdays (May 1, May 8, Ascension, July 14, August 15, November 1, December 25): 7 days (the exact count varies depending on the 2026 calendar).
(d) Prorated paid leave rights acquired: the employee hired on April 15 has not yet acquired any usable paid leave for the ongoing exercise. Thus, we account for 0 days (or the number of carried over days if applicable).
(e) Prorated days off from the day rate: assuming the yearly number of days off is 10. Prorating: 10 × (261 ÷ 365) = 7.15 days, rounded to 7.5 days.
Final Result: 261 − 74 − 7 − 0 − 7.5 = 172.5 days to work.
If the day of solidarity has not been conducted: 172.5 + 1 = 173.5 days.
This calculation must be documented in an annex to the employment contract or an amendment to ensure the security of the contractual relationship and allow for rigorous tracking of the counted working days. Use our day rate simulator to automate this calculation.
What Are the Most Common Mistakes Made by Employers During This Proration?
Disputes related to the day rate upon hiring mid-year reveal recurring mistakes that we list below, along with the associated legal risks:
1. Use of the thirtieth rule for the first month’s salary. This mistake is the most common. It leads to a salary amount that differs from the correct amount, sometimes favoring the employee, sometimes to their detriment. In both cases, the employee can claim back pay based on article L.3242-1 of the French Labour Code, which has a three-year prescription period (article L.3245-1).
2. Omission of proration of rest days. Some employers grant the full annual days off to employees hired mid-year, which artificially reduces the number of working days and can create difficulties in the event of later departure (settlement of accounts).
3. Prorating the days to work based on working days rather than calendar days. The method (a) → (e) mandates starting with calendar days. Starting with working days distorts the entire calculation downstream.
4. Failure to take into account the day of solidarity. Forgetting the day of solidarity is common when hiring mid-year, although the employee might not have performed this day with their previous employer. Nevertheless, article L.3133-7 of the French Labour Code mandates its annual performance.
5. Lack of written documentation of the calculation. The day rate agreement being a solemn act requiring the express agreement of the employee (Cass. soc., January 31, 2012, n° 10-17.593), the proration of the day rate in the event of hiring mid-year must be formalized in writing, ideally in the employment contract or an amendment.
How to Integrate the Proration of the Day Rate with Reporting Obligations in the DSN?
The déclarative social nominative (DSN) requires the monthly declaration of the number of days worked by the employee on a day rate. In the event of hiring partway through the month, the first DSN must reflect:
- The prorated compensation in accordance with the formula described above;
- The actual number of days worked during the incomplete month;
- The prorated annual day rate applicable to the employee.
It is essential to check the configuration of the payroll software on these three points, as DSN anomalies can trigger requests for explanations from URSSAF or the complementary retirement funds. To delve deeper into payroll mechanisms related to the day rate, consult our payroll guide.
What Are the Applicable Reference Texts?
The legal framework for the day rate in the case of mid-year hiring is based on the following texts:
- Articles L.3121-58 and following of the French Labour Code: general regime of the annual day rate;
- Article L.3242-1 of the French Labour Code: monthly salary;
- Article L.3132-1 of the French Labour Code: weekly rest;
- Article L.3133-1 of the French Labour Code: list of legal public holidays;
- Articles L.3133-7 to L.3133-12 of the French Labour Code: day of solidarity;
- Article L.3141-1 of the French Labour Code: paid leave.
The employer must also refer to the branch or company collective agreement establishing the day rate, which may provide specific modes of proration, provided that these are at least as favorable as the legal provisions.
FAQ — Frequently Asked Questions on the Payroll of an Employee on a Day Rate Hired Mid-Year
Does the Calendar Day Proration Also Apply in Case of Departure Mid-Month?
Yes. The calendar day proration method is symmetrical: it applies both to arrivals and departures mid-month. The settlement of accounts must be calculated using the same formula, retaining the actual number of calendar days 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 day rate, the excess days must be treated in accordance with the provisions of article L.3121-59 of the French Labour Code: the employee may, with the employer’s consent, waive part of their rest days in exchange for a salary increase of at least 10%, formalized by an amendment to the employment contract.
Can the Employer Apply a Different Proration Method Provided by Collective Agreement?
A collective agreement can provide specific proration modalities, provided they are at least as favorable as the legal method. However, the proration of the first month’s salary by calendar days remains the only compliant method according to the provisions of article L.3242-1 of the French Labour Code. The collective agreement cannot derogate from this to the detriment of the employee.
How to Handle Absences of an Employee on a Day Rate Hired Mid-Year?
Absences following hiring are deducted from the prorated day rate according to the same rules applicable to an employee present for the entire year. Each day of absence (sickness, unpaid leave, etc.) reduces the number of days to work by one unit and leads to a salary deduction calculated based on the daily salary (monthly salary ÷ 21.67 average working days, or according to the applicable conventional method).
Is It Necessary to Provide a Summary Document to the Employee?
Article L.3121-65 of the French Labour Code requires the employer to establish a control document showing the number and date of the worked days or half-days. In the case of mid-year hiring, this document must mention the applicable prorated day rate and the tracking of working days from the hiring date.
For any questions regarding payroll management of an employee on a day rate, feel free to contact our office. You can also use our online day rate simulator for instant calculations.