SII (Suministro Inmediato de Información) — Real-time VAT reporting system. Large businesses must submit invoice data to the AEAT (Agencia Tributaria) within 4 days of issue.
Spanish Chart of Accounts (PGC) — Pre-configured Plan General Contable account structure.
IVA Management — Handles Spanish VAT rates (21%, 10%, 4%) with correct tax codes and quarterly/annual return preparation.