The Immediate Supply of Information (SII) system requires the electronic issuance and reporting of detailed invoices issued and received within a maximum of four calendar days.
It is the solution for addressing the current VAT management system.
The SII is mandatory for those companies or professionals who have to submit their monthly VAT self-assessments.
The taxable persons under the SII are obliged to keep, through the electronic headquarters of the AEAT, through the electronic supply of the records , the following registration books:
The sending of this information is done electronically, specifically through the exchange of XML messages.
