Three letters come up in almost every French payroll administrator job ad: DSN. At interview, nobody will ask you to recite the technical standard, but they will check that you know what you file, when, and what you do when the filing comes back with errors. This article explains the déclaration sociale nominative (nominative social declaration) from the point of view of the person who prepares it: what it replaces, the difference between the monthly DSN and event notifications, the calendar, the most common errors and how to talk about it on a payroll CV.
What the DSN is for
A single declaration, produced by payroll
The DSN is an online declaration made every month from payroll data. It replaces most of the social declarations an employer used to make separately to each body. The administration’s page on the nominative social declaration 🔗 describes it as a single, automated transmission of information about each employee, generated from the payroll software.
What it contains
Two broad families of information appear in it:
- each employee’s payroll data: pay, bonuses, contributions, contract, working time;
- the events that affect their periods of activity: sick leave, illness, maternity, paternity, end of contract.
Who receives it
The DSN feeds the Urssaf (social contributions collection), the health insurance fund, supplementary pension funds, France Travail (the public employment service), insurance and health cover providers, and the tax authority for withholding income tax at source. One declaration, many recipients: that is why an error spreads quickly.
One DSN per establishment
A point beginners often forget: the DSN is filed per Siret number, that is per establishment, not per company. A company with three establishments files three DSNs every month.
Monthly DSN and event notifications
The monthly DSN
This is the main declaration. It covers the previous month’s payroll, employee by employee, and is the basis for calculating and paying contributions. It is filed once a month, even when nothing has changed.
Event notifications
Between two monthly DSNs, some events must be notified without waiting. According to the Service Public Entreprendre page, these are sick leave (illness, maternity, paternity), early return to work and end of contract, whatever the reason for leaving. These notifications must be sent within five working days of the event.
Why these notifications matter
The sick leave notification allows the health insurance fund to calculate the employee’s daily allowances. The end-of-contract notification produces the employer certificate the employee needs for their rights with France Travail. A delay or an error therefore has a direct effect on the person concerned: it is often how an employee discovers that their file was handled badly.
What the administrator actually does
- check that the leave or departure is entered in the software with the right dates;
- check the reference salary items;
- generate the notification, file it and check the response;
- alert the employee or their manager if a document is missing.
The filing calendar
Two deadlines depending on headcount
The deadline for the monthly DSN depends on the size of the company. According to Service Public Entreprendre 🔗, a company with fewer than fifty employees files its DSN no later than the 15th of the month following the period worked; a company with fifty or more employees files it no later than the 5th. When the date falls on a non-working day, it moves to the next working day.
Filing on net-entreprises
Filing is done on the net-entreprises 🔗 portal, either directly from the payroll software or by uploading the file. The portal publishes the DSN technical documentation, including the technical specification updated every year, and offers a checking tool, DSN-Val 🔗, which lets you verify a file before filing it.
The rhythm of a close
In practice, the monthly DSN is prepared in the days after payroll is approved: generating the file, checking, filing, then reading the responses. Many payroll teams set themselves an internal date earlier than the legal deadline, to keep time in case of errors.
Who files
The employer can file directly, entrust the declaration to a third-party filer (an accounting firm, for example) or share the tasks. In a firm, the payroll administrator therefore files the DSNs for all their client files, with different deadlines depending on their headcount.
The most common errors and anomalies
Responses after filing
After a filing, several responses come back: an acknowledgement of receipt, a control report that flags blocking or non-blocking anomalies, then reports from the receiving bodies. Knowing how to read and handle these responses is part of the job. An administrator who says “I file and I don’t open the responses” worries a recruiter.
Frequent errors
- A forgotten event: sick leave entered too late, a departure not notified, which delays allowances or the employer certificate.
- Wrong identification data: social security number, usual name, date of birth entered incorrectly at hiring.
- A badly set-up contract: end date of a fixed-term contract, part time, executive or non-executive status.
- Pay items linked incorrectly: a bonus subject to the wrong contribution regime, a pay item created without complete settings.
- An insurance or health cover enrolment inconsistent with the contract the company has taken out.
Correcting rather than hiding
An anomaly is corrected at the source, in the payroll software, then regularised in a later DSN or through a DSN that cancels and replaces the previous one, depending on the case and the timing. The reflex to show at interview: understand where the error came from before correcting it, so that it does not come back the following month.
An example of reasoning
An employee reports that they are not receiving their daily allowances. The administrator first checks that the sick leave notification was filed, then that it was accepted, then that the dates and the reference salary are correct. This simple sequence, told at interview, shows more command than a definition of the standard.
Highlighting the DSN in a payroll application
On your CV
The DSN is expected of every payroll administrator: writing it alone in your skills does not set you apart. What sets you apart is what you do with it and on what scope. Compare:
Before
Managing the DSN.
After
Filed monthly DSNs for three establishments and processed sick leave and end-of-contract notifications; read control reports and corrected anomalies at the source in the payroll software.
The second line gives the volume, the types of declarations and your method. To see how it fits into a complete CV, look at the payroll administrator CV example or the one for a personnel administrator working on ADP.
At interview
Prepare an example of an anomaly you handled, from the finding to the correction. If you are just out of training, practise on a sick leave or end-of-contract case: these are the two topics asked about most often. Our article on the payroll administrator job describes the close in which the DSN fits, and the one on the payroll administrator CV details the other sections to work on.
Writing without wasting time
When your lines are ready, create your CV for free. The editor arranges your sections in a clean layout, and the exported file stays readable by payroll recruiters’ screening software: words like “DSN”, “notification” or the name of your software are properly picked up, whereas they often get lost in very graphic CVs.
Sources
- Service Public Entreprendre, Nominative social declaration (DSN) 🔗: content, deadlines, event notifications and filers.
- Net-entreprises, filing portal 🔗 and DSN documentation 🔗.
- Net-entreprises, DSN-Val checking tool 🔗.
Frequently asked questions
What exactly does the DSN replace?
It replaced most periodic and event-based social declarations: contribution returns, the annual salary declaration, salary certificates for daily allowances, the employer certificate, labour movement returns, among others. Net-entreprises keeps the complete list up to date.
Do you have to file a DSN if there was no payroll in the month?
A company with employees files a DSN every month. Special cases (temporary absence of employees, a closed establishment) are covered in the net-entreprises documentation: that is the right reflex to mention if the question comes up at interview.
Does the payroll administrator need to know the technical standard?
Not in detail. They need to know what their DSN contains, generate it, read the responses and correct anomalies. Questions about the file structure are rather a matter for the software vendor or the system set-up.
Is the DSN the same in a firm and in-house?
Yes, the declaration is identical. What changes is the volume: in a firm, you handle the DSNs of many client files with different deadlines, which requires a very rigorous organisation of the calendar.