What is SII and how does Spain's real-time invoice reporting work?
SII (Suministro Inmediato de Informacion) is Spain's mandatory real-time VAT reporting system. Large taxpayers and VAT groups must transmit invoice records to the AEAT (Agencia Estatal de Administracion Tributaria) within four calendar days of the invoice issue date. SII replaces the traditional annual VAT books submission and gives AEAT near-real-time visibility of VAT transactions.
Who is required to use SII in Spain?
SII is mandatory for: (1) Large taxpayers (annual turnover exceeding EUR 6 million); (2) VAT groups; (3) Businesses registered in the REDEME (Monthly VAT Return Register); (4) From 2024, certain additional taxpayer categories. Voluntary registration is also available. For entities outside these groups, traditional annual VAT book submission remains valid. Each SII-registered business must connect their invoicing system to the AEAT web service for transmission.
Frequently Asked Questions
- Does SII replace Spain's VAT return (Modelo 303)?
- SII does not replace the Modelo 303 VAT return, but the data submitted via SII is used by AEAT to cross-validate the Modelo 303. SII-registered businesses benefit from an extended Modelo 303 filing deadline (30 days instead of 20) and reduced reporting requirements for some annual informative filings. AEAT uses SII data to offer pre-populated VAT return drafts to businesses.
- What data must be included in SII submissions?
- SII requires separate transmission of: (1) Issued invoice records (Libro de Facturas Expedidas): customer, invoice date, number, base amounts by VAT rate, VAT amount, total; (2) Received invoice records (Libro de Facturas Recibidas): supplier, invoice date, number, deductible VAT amounts; (3) Intra-community operations; (4) Certain investment asset and intra-community supply records. Each submission must reference the correct book type and operation type code.