Single Italian-only store vs Italian + DACH (Austria + Switzerland) multi-store?

Magento’s multi-store architecture handles IT + DACH (Germany / Austria / Switzerland) cleanly because all four share EUR currency (CH uses CHF), similar B2B patterns, and overlapping languages (Italian in Ticino + Bolzano, German in DACH + Alto Adige).

• Single Magento backend, 3-4 stores, IT (Italian + English), AT (German), CH (German + Italian + French), optional DE (German). Shared catalogue, separate URLs (yourbrand.it / .at / .ch / .de) or one domain with country selector.
• Per-store IVA / MwSt, IT 22% + reduced rates, AT 20%, CH 8.1% (different VAT system), DE 19%. Magento tax_zone rules per store.
• Per-store payments, IT adds Satispay + BancomatPay + Postepay + Nexi, DACH adds SOFORT + giropay + EPS (AT) + TWINT (CH), all share PayPal + Klarna.
• Per-store e-invoice, IT does SDI / FatturaPA, AT does no mandatory e-invoice B2B (only B2G via PEPPOL), CH no mandatory, DE rolling out 2025-2028.
• Per-store legal pages, Garante (IT), DSB (AT), FDPIC (CH), BfDI (DE).

Architecture decided in the audit step, depends on whether you want one ops team or four.