It's the form an employer files with the regional employment system to announce a hire, an extension, a transformation, or an end of contract. The notice has to be sent inside specific deadlines.
Without UNILAV filings, your employment doesn't officially exist in the public databases. Banks, INPS, and immigration checks all rely on these records.
Each event (start, end, change) has its own deadline. Late filings carry fines for the employer and can complicate your contributions history.
Official source
Ministero del Lavoro
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