What is a Tier 1 vs Tier 2 vs Tier 3 ERP?

ERP tiers describe scale and complexity. Tier 1 ERPs (SAP S/4HANA, Oracle ERP Cloud) serve large enterprises with thousands of users and complex global operations. Tier 2 ERPs (NetSuite, Dynamics 365, Acumatica) target mid-market companies from $10M to $500M in revenue. Tier 3 ERPs (Sage 50, QuickBooks Enterprise) serve smaller businesses. Most QuickBooks migrations land in Tier 2.