A contractual teacher hired in September discovers on their first payslip an amount that is several dozen euros lower than what they had estimated. The difference often comes from a line that was not anticipated: PSC contribution, incorrectly reported major index, or work quota forgotten in the calculation. To avoid this discrepancy between estimation and reality, one can rely on a salary simulator, provided they know what to enter and how to interpret the output.
PSC Reform 2026 and net salary: what simulators have changed
Since the full implementation of the complementary social protection (PSC) reform in the state public service, teachers’ payslips now display new contribution lines related to complementary health. For a contractual teacher, this translates into a visible decrease in net salary compared to previous estimates.
The updated simulators now incorporate these PSC lines. The Mathix simulator, for example, offers specific options to set up the 2026 complementary health, with amounts varying according to individual decrees and coverage choices. A contractual teacher using an outdated tool or leaving this option as default risks overestimating their net salary by several dozen euros per month.
Before any simulation, it is essential to check that the tool explicitly mentions the PSC or the employer’s contribution to complementary health. If this line does not appear, the result will be mechanically too optimistic. This is the first reflex to have, and yet it is the one that most online guides do not mention.
Setting up a contractual salary simulator without mistakes
The majority of simulation errors do not come from the tool but from the data entered. A contractual teacher salary simulator generally requires three basic pieces of information: the major index, the work quota, and the academy of employment. The problem is that many contractual teachers do not know their index at the time of hiring.
Finding your major index before the first pay
The recruitment index depends on the degree held and the recognized seniority. Each academy applies its own scale, which means that the same profile can be recruited at different indices depending on the rectorate. These scales can generally be found on the website of the relevant rectorate or in the documents provided when signing the contract.
If the recruitment decree is not yet available, one can use the minimum index of the corresponding category to obtain a low estimate. This is more prudent than choosing an index at random.
Quota and incomplete time: the classic trap
A part-time contractual teacher does not necessarily work half-time. The quota can be 40%, 60%, or 80%, depending on the number of hours assigned relative to the regulatory service obligation. Confusing incomplete time with part-time skews the simulation, because contributions are not calculated the same way.
In the simulator, one should enter the exact quota stated in the contract, not a rounded estimate. A difference of a few percentage points alters the gross treatment and, by extension, all contribution lines.
Practical case: second-degree contractual teacher hired mid-year
Let’s take a common situation: a contractual teacher hired in January to replace a permanent teacher on leave, with a contract running until the end of June. The following elements are entered into the simulator:
- The major index stated in the recruitment decree, multiplied by the current value of the index point, to obtain the monthly gross salary
- The service quota (here, full time if the replacement covers the entire service obligation of the replaced permanent teacher)
- The ISOE (indemnity for student monitoring and guidance) as a fixed amount, paid to all second-degree teachers, including contractual ones
- The PSC line if the simulator offers it, with the corresponding settings for the chosen coverage
The net result displayed corresponds to a full month worked. For the first and last months (often incomplete), the actual amount will be prorated. This is a point that simulators do not always clarify clearly. One then obtains a “full” monthly net that must be manually adjusted for truncated months.
Checking the result with the actual payslip
Once the first pay is received, one compares line by line. The most common discrepancies concern the PC deduction (civil pension, applicable to permanent teachers but not to contractual ones who contribute to IRCANTEC), and the CSG/CRDS whose base differs slightly depending on the status. If the discrepancy exceeds a few euros, it is likely due to a parameter incorrectly entered in the simulator rather than an error by the administration.
Limits of simulators and points of caution for contractual teachers
Online simulators, whether union-based or from specialized blogs, rely on published scales and official contribution rates. Their reliability entirely depends on the frequency of updates. An outdated simulator after an index point revaluation gives a false result.
Another limitation: most tools are designed for permanent teachers and then adapted for contractual teachers. Feedback varies on this point, with some simulators poorly handling the specifics of the non-permanent contribution regime (IRCANTEC instead of civil pension, absence of certain statutory bonuses).
- Check the date of the last update of the simulator before any use
- Ensure that the proposed contribution regime corresponds to the contractual status (IRCANTEC, not RAFP)
- Do not include bonuses to which contractual teachers are not entitled (attractiveness bonus reserved for permanent teachers in certain cases, REP/REP+ allowance under conditions)
The simulator provides an estimate, not a payslip. For a contractual teacher whose contract lasts a few months, the acceptable margin of error is around a few euros. Beyond that, it is better to contact the management service of the rectorate with their decree in hand.
The most reliable method remains to cross-check two different simulators with the same data. If the results converge within a few euros, the estimate holds. If the gap is wider, it indicates that a parameter differs between the tools, and it is this parameter that needs to be identified before trusting the displayed amount.