We've put together an Italian tax guide for Shopify stores to help you configure your VAT (IVA or Imposta sul Valore Aggiunto) properly. We have guides for other major EU countries too, as well as non-EU countries such as Australia, Canada, India, etc.
You should also consider providing legal invoices to your Italian customers using our Shopify invoicing app for Italian stores. Our invoices display all required information, including VAT ID numbers (P.IVA or Partita Imposta sul Valore Aggiunto) of your store and business customers, as well as C.F. (Codice Fiscale) of your consumers.
Hope this helps!
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