Spain does not have one e-invoicing mandate arriving on a fixed date, the way UAE businesses are used to thinking about MD 243. It has three overlapping regimes converging in the same window, each covering a different layer of the same transaction. The Immediate Supply of Information (SII) has reported VAT ledger data close to real time for large taxpayers since 2017. Verifactu, built on Spain's 2021 anti-fraud law, requires invoicing software to produce tamper-evident records and, in most configurations, transmit each invoice to the Agencia Tributaria as it is issued. Layered on top of both is the business-to-business e-invoicing obligation under the Crea y Crece law, still working through implementing regulation, with rollout expected through 2026 and 2027.
For a UAE practitioner the useful question is not which of these three is Spain's "real" mandate. It is which global model each layer represents, because that determines what evidence and control design it expects from the business. SII and Verifactu behave like reporting models: they transmit transaction data to the authority without gating the commercial exchange between supplier and buyer. The B2B obligation under Crea y Crece, once finalised, is expected to add a genuine exchange layer of its own — closer to the interoperability model the UAE and Belgium already run than to the reporting layers sitting beneath it.
Overlap, Not Sequence, Is the Operating Reality
Businesses tend to assume a new compliance regime retires the one before it. Spain shows the opposite pattern. SII did not disappear when Verifactu arrived, and Verifactu will not disappear once the Crea y Crece B2B obligation lands. A Spanish entity inside a UAE group may need to satisfy all three at once: VAT ledger reporting through SII, tamper-evident invoicing software certified under Verifactu, and eventually structured B2B exchange under Crea y Crece. A smaller entity below SII's threshold may carry only the latter two. The compliance footprint depends on entity size and transaction type, not a single go-live date on a calendar.
For a finance function that has already built UAE e-invoicing governance — one place tax logic is decided, one place master data is corrected before it reaches an invoice — the risk in Spain is treating these three regimes as three separate remediation projects. They are not. The invoicing software certified under Verifactu, the ledger feed running through SII, and the eventual Crea y Crece exchange layer should all draw from the same governed transaction record. Built as three unconnected projects, they produce three defensible-looking versions of the same invoice, each answerable to a different part of the same tax authority.
What to Do Before the B2B Date Is Confirmed
Because the Crea y Crece implementing timetable is still being finalised, the useful move for a Spain-UAE group is not waiting for it. Verifactu software certification and SII ledger accuracy are live obligations already, and the master data and tax-logic work behind them is the same investment that will carry into whatever exchange format the eventual B2B mandate specifies. This is the pattern Real-Time Tax Transformation (forthcoming) describes across every market it examines: the technology layer changes from country to country. The governance discipline behind it — accurate master data, a single source of tax truth, clear ownership when something in the chain fails — does not.