Conservazione sostitutiva (legal electronic archiving)

Conservazione sostitutiva ensures an Italian electronic invoice stays authentic, intact and legible throughout its legal retention period.

Definition

Conservazione sostitutiva (substitutive archiving) is the Italian process for keeping documents in digital form with the same legal value as a paper archive. It applies in particular to electronic invoices flowing through the SdI, but also to other tax and accounting documents.

Its goal is to ensure a document remains, over time, authentic, intact, reliable and legible.

How it works

The process relies on digital-trust mechanisms that seal documents and lock their state:

• Electronic signature (or seal) to guarantee origin and integrity;
• Qualified timestamping to fix an enforceable date;
• Retention index and metadata describing the archived batches.

A role called the responsabile della conservazione (retention manager) oversees the arrangement; the service is often delegated to a specialised provider.

Good to know

Conservazione sostitutiva is distinct from issuing the invoice: the SdI transmits the invoice but does not replace the evidential archiving obligation, which remains the company's responsibility. The retention period follows Italian tax deadlines, measured in years.

Simply backing up PDF or XML files is not enough: without a signature, timestamp and formalised process, the archive has no evidential value.