The reclassification (requalification) of a part-time contract as full-time entitles the employee to wage back-pay calculated on a full-time basis. Two grounds are covered here: a contract with no written terms stating the working hours and how they are spread, which raises a presumption of full-time work, or additional hours (heures complémentaires, the hours a part-time employee works beyond the contractual hours) that reach the statutory working time. The claim for back-pay is subject to a three-year limitation period.
A part-time employee's contract is a written contract (article L3123-6 of the Labour Code). It states:
The first ground turns on two of these terms: the working hours and how they are spread. The file therefore starts with the contract and its amendments.
The absence of written terms stating the working hours and how they are spread raises a presumption that the job is full-time. The Cour de cassation restated this on the basis of article L3123-6, in a published judgment (Cass. soc., 10 December 2025, n° 24-12.066): an employer that contests this presumption must prove, first, the exact weekly or monthly working hours agreed and, second, that the employee was not put in a position where they could not foresee the pattern on which they were to work and did not have to remain constantly at the employer's disposal.
The presumption is rebuttable. Published judgments show what is not enough (those from 2012 to 2014 were handed down under former article L3123-14):
| Judgment (social chamber) | What the lower courts had held | What the Court ruled |
|---|---|---|
| 21 November 2012, n° 11-10.258 | Activity that did not amount to full-time work, employee also working for another employer | Quashed: the court had to examine whether the employer proved the exact hours agreed |
| 9 January 2013, n° 11-16.433 | Variable working hours below the statutory working time, schedules drawn up from one week to the next | Quashed: the presumption could not be set aside without proof by the employer of the exact hours agreed |
| 17 December 2014, n° 13-20.627 | Precise monthly records of the transport runs carried out, hours announced at least three days in advance save in exceptional cases | Quashed: for the period before June 2007, the employer did not establish the agreed working hours |
| 10 December 2025, n° 24-12.066 | Accountant on 40 hours a month, mainly on Saturdays, who held other jobs as well | Quashed: reasons insufficient to establish the twofold proof |
For the employee's lawyer, the reflex is to check that the working hours and how they are spread appear in the initial contract and in each amendment, then to gather what shows the hours were unpredictable: altered schedules, messages calling the employee in, gaps between planned and actual hours.
Additional hours may not bring the working time of a part-time employee up to the statutory working time or, where it is lower, the working time set by collective agreement (article L3123-9). Where they do, the contract must be reclassified as a full-time contract from the first irregularity (Cass. soc., 17 December 2014, n° 13-20.627, published in the Bulletin).
Two published judgments show that a brief overrun is enough, and a third clarifies what goes into the count (these three judgments, like the one of 17 December 2014, were handed down under former articles L3123-14, L3123-17 or L3123-25):
The same chamber sets the limit: for variable-hours part-time work, neither exceeding the contractual hours over the year nor breaching the one-third limit on working time set by the collective agreement and the company agreement justifies reclassification in itself, as long as the working time was not brought up to the statutory weekly working time or the working time set by collective agreement (Cass. soc., 18 December 2019, n° 18-12.447, published in the Bulletin, contract concluded under the regime predating the law of 20 August 2008). For the lawyer, the work therefore consists in finding, in the schedules and time records, the first week or the first month in which the statutory or agreed working time was reached.
Even without reclassification, additional hours follow their own rules:
| Rule | Text |
|---|---|
| Statutory ceiling: one tenth of the hours stated in the contract | L3123-28 |
| Ceiling raised up to one third by collective agreement | L3123-20 |
| Premium absent an agreement: 10% up to one tenth, 25% between one tenth and one third | L3123-29 |
| Rate set by an extended sector-level agreement, never below 10% | L3123-21 |
Another mechanism deserves attention: where, for twelve consecutive weeks, twelve weeks out of fifteen or the longer period provided for by a collective agreement concluded under article L3121-44, the average hours actually worked exceeded the scheduled hours by at least two hours a week, or the monthly equivalent, the contract is amended, subject to seven days' notice and unless the employee objects. The amended hours equal the previous hours plus the difference from the average hours actually worked (article L3123-13).
A claim for wage back-pay based on the reclassification of part-time work as full-time is subject to the three-year limitation period of article L3245-1 (Cass. soc., 9 June 2022, n° 20-16.992, published in the Bulletin). This text allows the employee to claim the sums due for the last three years or, where the contract has ended, for the three years preceding its termination.
The same judgment clarifies the starting point: it is not the irregularity relied on, but the date on which the wage back-pay owed as a result of the reclassification fell due, that is, for an employee paid monthly, the usual pay date. In that case, the employee argued that they had reached the statutory working time in September 2013; dismissed in October 2015, they had brought the case before the conseil de prud'hommes (France's labour court) on 12 December 2016, which interrupted the limitation period, and the wage back-pay falling due from November 2013, less than three years before the termination, was not time-barred. Each wage payment becomes time-barred from its own due date.
Take a fictitious case: an employee hired for 24 hours a week, or 104 hours a month (24 × 52 / 12), paid €14 gross an hour, dismissed two years after one working week reached 35 hours, and who brings the case before the conseil de prud'hommes as soon as the contract ends. We assume that only the 104 contractual hours were paid each month.
| Step | Calculation | Result |
|---|---|---|
| Full-time monthly hours | 35 × 52 / 12 | 151.67 hours |
| Monthly gap | (35 − 24) × 52 / 12 | 47.67 hours |
| Back-pay per month (no intermediate rounding) | 11 × 52 / 12 × €14 | €667.33 |
| Period counted | from the overrun to the termination | 24 months |
| Gross wage back-pay | 11 × 52 × €14 × 2 | €16,016 |
Reclassification runs from the week of the overrun (Cass. soc., 15 September 2021, n° 19-19.563), and the back-pay covers the wages that have fallen due since that date, within the limit of article L3245-1. It comes on top of the other heads of claim arising from a termination, such as compensation for dismissal without real and serious cause or payment in lieu of notice.
Where hours worked do not appear on the payslips, the question of travail dissimulé (concealed/undeclared work) arises. In the judgment of 10 December 2025, the employee also claimed the indemnité forfaitaire (a fixed lump-sum indemnity set by statute) for travail dissimulé: quashing the decision on reclassification led to quashing the dismissal of that claim, which depended on it. The indemnité forfaitaire (article L8223-1) does, however, require intentional concealment: see how to calculate the indemnity for travail dissimulé.
For the rest of the file, Plato, which is extending into employment law, calculates overtime back-pay and models termination scenarios, with every amount traceable back to its source: see its employment law specialisation. The final check remains the lawyer's.
Is a part-time contract with no written terms automatically full-time?
No. The absence of written terms stating the working hours and how they are spread raises a presumption of full-time work, but the presumption is rebuttable. The employer can rebut it by proving the exact hours agreed and that the employee could foresee their pattern of work without remaining constantly at the employer's disposal (Cass. soc., 10 December 2025, n° 24-12.066).
Is a single week at the statutory working time enough to reclassify the contract?
Yes. Article L3123-9 prohibits additional hours from bringing working time up to the statutory working time. The Cour de cassation holds that reclassification runs from the first irregularity (Cass. soc., 17 December 2014, n° 13-20.627), and has held that a week of 36.75 hours required reclassification from that overrun, even for a contract with monthly hours (Cass. soc., 15 September 2021, n° 19-19.563, published in the Bulletin). Both judgments were handed down under former article L3123-17.
From when does reclassification take effect?
Where additional hours reach the statutory working time, from the first irregularity (Cass. soc., 17 December 2014, n° 13-20.627). Wage back-pay remains limited by the three-year limitation period of article L3245-1.
What is the time limit for claiming wage back-pay after reclassification?
Three years, from the date each wage payment fell due, not from the irregularity (Cass. soc., 9 June 2022, n° 20-16.992). If the contract has ended, the claim may cover the sums due for the three years preceding the termination (article L3245-1).
For variable-hours part-time work, is breaching the variation limit enough to reclassify the contract?
No, not on its own. The Cour de cassation has held that neither exceeding the contractual hours over the year nor breaching the one-third limit on working time set by the collective agreement and the company agreement justifies reclassification in itself, as long as the statutory or agreed working time is not reached (Cass. soc., 18 December 2019, n° 18-12.447, contract concluded under the regime predating the law of 20 August 2008).
How is the wage back-pay calculated?
On the difference between full-time pay and the pay actually received, month by month, from the date of reclassification and within the limitation period. For 24 hours paid per week instead of 35, at €14 an hour, the gap is 11 × 52 / 12 × €14, or €667.33 gross a month.