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Practical guide
A line called “Montant net social” now sits at the bottom of every French payslip. It is neither your take-home pay nor your taxable net: it is the figure to declare for in-work benefits and the RSA. This guide explains where it comes from and when it differs from net pay.
Right at the bottom of the payslip, a recent line puzzles people: “Montant net social”, often close to take-home pay, sometimes a few tens of euros apart. This guide explains what it measures, why it exists, what the CAF (the family benefits office) does with it, and how it differs from the other nets, with an example where the site's engine works out all three figures side by side.
The montant net social is income net of compulsory social contributions, before tax, calculated the same way for every employee whatever the employer. It was created to replace a headache: before it, each benefit claimant had to rebuild their income from payslips that did not all show the same lines, with frequent errors in both directions. Since 1 February 2024, it is the reference figure to copy into quarterly means declarations; the employer also sends it directly to the administration, which allows those declarations to be pre-filled, by the CAF since March 2025, then by the MSA.
Take €3,000 gross a month, non-cadre, standard company health cover, and compare two cases: without any particular perk, then with meal vouchers (19 vouchers of €8 a month, half paid by the employer). All three amounts are read from the site's engine.
| Line | Without meal vouchers | With meal vouchers |
|---|---|---|
| Gross salary | €3,000 | €3,000 |
| Take-home pay before tax | €2,353 | €2,277 |
| Montant net social | €2,353 | €2,353 |
| Taxable net pay | €2,459 | €2,459 |
Without perks, take-home pay and the montant net social are identical: gross minus employee contributions, full stop. With meal vouchers, your share (€76 a month) is deducted from take-home pay, but it is not a contribution: the montant net social does not move. Taxable net pay is higher in both cases, because it adds back the non-deductible CSG-CRDS and the employer's share of health cover, and does not take off your share of meal vouchers either. Three figures, three uses: the bank transfer, benefits, income tax. The guide on meal vouchers explains the rest of their rules.
Calculation: modele-social publicodes engine, which flags its montant net social rule as experimental; the amounts are to the nearest euro for a typical situation, and the real payslip may differ depending on the perks and deductions specific to your contract.
The formula starts from gross pay in the broad sense and takes off the compulsory social contributions you pay. Gross pay includes base salary, bonuses, overtime and additional hours, benefits in kind, end-of-fixed-term-contract indemnities, and the part of expense reimbursements that exceeds what the administration exempts. Compulsory employee contributions are then deducted, including your share of company health and provident cover; the share your employer pays for that cover is not added, under the rules in force in 2026. Tax withheld at source, your share of meal vouchers, attachments of earnings and advances are not deducted: they are not contributions, they are uses of your net pay. The exact list of items counted is set by the official social security bulletin (BOSS), cited at the bottom of the page, which also publishes any announced changes.
To redo this calculation on your own salary, the gross-to-net converter gives take-home pay and taxable net to the nearest euro. And if the real issue is that this net is too low, start by measuring what your CV is worth on the market: in-work benefit tops up a salary, it does not replace a negotiation.
Before tax: it takes compulsory social contributions off gross pay, never tax withheld at source. That is deliberate: welfare benefits are worked out on what you earn, not on what is left after your income tax, which depends on your household.
The montant net social, as printed on each payslip of the period, added up over the months requested. If your declaration is pre-filled, check that it uses those figures. In the guide's example, both are equal (€2,353) as long as no personal deduction comes between them; they diverge as soon as there are meal vouchers, a benefit in kind, an expense reimbursement or an attachment of earnings.
Because some sums taken off your net are not contributions: your share of meal vouchers, an advance already paid, an attachment of earnings, the repayment of a benefit. The montant net social ignores them and stays at the level of your actual pay. Conversely, it does not count the employer's share of meal vouchers or reimbursed professional expenses.
The line is compulsory on every payslip: ask your employer to show it, as their payroll software calculates it. In the meantime, do not declare your take-home pay instead: contact the CAF, which receives the amount directly through the employer's social declaration.
This guide gives you a method, not legal advice: the official rules and amounts are those of the sources above, as at their date.
The site's tools and features that go with this guide: the figures there are calculated by the code, never by the AI.