If tax is not being calculated correctly on the storefront for shipments to Italy, the likely problem is that the "Tax Jurisdiction" for Italy is missing. Tax jurisdictions are critical configurations in the Business Manager that need to be set up correctly to ensure accurate tax calculations. If a jurisdiction is missing, tax calculations cannot be correctly applied to transactions within that specific area, resulting in incorrect or absent tax charges. This is consistent with Salesforce B2C Commerce Cloud's tax management features which require correct settings at the jurisdiction level to function properly.