What Verifactu is
Verifactu is the popular name for Spain’s Regulation on computerised invoicing systems (Royal Decree 1007/2023), which implements the 2021 anti-fraud law. It requires the software you issue invoices with to guarantee that every invoicing record is complete, traceable and unalterable: an issued invoice cannot be deleted or changed without leaving a trace.
The regulation allows two ways to comply. In VERI*FACTU mode, the software sends each record to the Spanish Tax Agency (AEAT) at the moment the invoice is issued. In the other mode, the software signs and keeps the records so they are available to the tax authorities if requested.