SDI (Italy)
GeneralSistema di Interscambio; Italy’s government clearance platform for mandatory B2B and B2G e-invoicing. Every invoice issued in Italy must pass through the SDI for validation before it is legally delivered to the recipient.
Why it matters
Italy has required electronic invoicing for almost all domestic sales since 2019, and an invoice exists for tax purposes only once the SDI has accepted it. A rejected file means the invoice was never issued, so validation errors have to be corrected and the invoice resubmitted within the deadline.
Worked example
A Milan agency issues an invoice in FatturaPA XML and sends it to the SDI, addressed to the client’s seven-character recipient code. The SDI checks it, delivers it to the client and returns a delivery receipt to the agency. Had the client’s VAT number been wrong, the SDI would have sent back a rejection notice instead and the invoice would count as not issued.
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