France’s DSN and Switzerland’s AVS/LPP filings consolidate all social data — headcount, salaries, contributions, events — into a single flow. Illizeo generates and submits them automatically every month.
French DSN calendar #
| Type | Deadline | Content |
|---|---|---|
| Monthly DSN | 5th or 15th of next month | Salaries, URSSAF / pension contributions |
| Event-based DSN | Within 5 days | Hire, leave, sickness |
| Yearly DSN (formerly DADS-U) | January 31 | Annual report to tax authority |
Swiss main filings #
| Filing | Deadline | Recipient |
|---|---|---|
| AVS notice | Monthly / annual | Compensation fund |
| LPP (2nd pillar) | Quarterly or monthly | Pension institution |
| LAA (accident) | Annual | SUVA / other insurer |
| Withholding tax | Monthly | Cantonal tax authority |
Step-by-step #
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Configure settings #
SIRET / IDE number, OPS, collective agreements, payroll codes. Done at onboarding and on each change.
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Trigger generation #
At monthly cut-off, Illizeo produces the compliant file (DSN XML for FR, swissdec ELM for CH).
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Check authorities’ returns #
Receipt within 24h. Any errors flagged with code and explanation.
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Fix on rejection #
The payroll expert handles rejections and sends a corrective return within 5 days.
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Archive #
5-year retention of returns + receipts. Audit-ready.
FAQ #
Late DSN impact?
FR: €7.50 per employee, doubled if not fixed within 30 days.
What about withholding tax?
FR: deducted on payslip and remitted to tax authority via DSN. CH: withheld for cross-border workers and some residents.
Swissdec compliance?
Illizeo is ELM 5.x certified, the Swiss standard for automated submissions.
URSSAF audit, how do I prepare?
The DSN audit export bundles all files and receipts for the requested period.
