Can I run one Magento for the Nordic cluster, DK + SE + NO + FI?

Yes, Nordic cross-border is one of the cleanest multi-store use-cases in Magento because the four countries share enough (language families, similar logistics, similar legal frameworks) but diverge enough in payment, currency, and tax that each needs its own store.

• Denmark, DKK + 25% Moms + MobilePay + Dankort + Klarna + NemHandel.
• Sweden, SEK + 25% Moms + Swish + Klarna (Swedish-born) + Bankgiro / Plusgiro for invoice.
• Norway, NOK + 25% MVA + Vipps (Norwegian sister to MobilePay) + Klarna + Visa/Mastercard. Non-EU/EEA, customs declarations matter.
• Finland, EUR + 25.5% ALV (as of Sept 2024) + MobilePay (Finland is a MobilePay market too) + Klarna + Nets/Verifone.

Magento architecture: single backend, 4 websites or stores, shared catalogue with per-country price + tax + payment overrides. Use Magento’s native price-scope per website. For shipping, integrate PostNord (covers all 4 countries, the Nordic default) plus country-specific carriers (GLS DK, Bring NO, Posti FI). For customer-data privacy, all 4 are GDPR but enforced by Datatilsynet (DK), IMY (SE), Datatilsynet (NO), Tietosuojavaltuutettu (FI).