General information

Description of the VAT management system based on the Immediate Supply of Information

This is a VAT management system based on the Immediate Supply of Information ( SII ).

• Taxpayers required to use the SII (and those who voluntarily decide to use it) must send the details of the billing records within a period of four days through the Electronic Office of the Tax Agency. 

• They are not required to submit forms 347 (transactions with third parties) and 390 (annual VAT summary).

• Taxpayers can compare the information in their registration books with the information provided by their clients and suppliers, provided that they are also included in the system.

This Value Added Tax management system is based on the maintenance of the Tax Registration Books through the AEAT Electronic Office by means of the quasi-immediate supply of the billing records.

The “Immediate Supply of Information” (SII) represents a substantial improvement in the communication relationship between the Administration and the taxpayer, since it allows for a bidirectional, automated and instantaneous relationship. It is also configured as a tool for both taxpayer assistance and improvement and efficiency in tax control. For example, it allows the Pre303/LLAA service to be provided to certain taxpayers, for the automatic preparation of VAT self-assessment.

The SII basically consists of electronically transmitting billing records from VAT Books. To do this, the taxpayer must send the Tax Agency billing details electronically (using web services based on exchanging XML messages or, if applicable, by filling out the online form) and using this information the different Record Books will be configured, practically in real time. But taxpayers are not required to send the actual bills.

In the case of simplified invoices , issued or received, they can be grouped, provided they meet certain requirements, and the billing records of the corresponding summary entry can be sent.

The collective compulsorily included in the “SII” is made up of all those taxpayers whose obligation to self-assess the Value Added Tax is monthly:

• Large Businesses (turnover of over 6 million euros)

• VAT Groups

• Registered with REDEME (Monthly VAT Return Registry)

• Holders of tax warehouses for gasoline, diesel or biofuels included in the objective scope of the Hydrocarbon Tax, as well as entrepreneurs or professionals who extract these products from tax warehouses (from 01/01/2025).

This group has developed software systems that are ready to adapt to comply with the sending of billing records within a period of four days (excluding Saturdays, Sundays and national holidays).

Additionally, any other taxpayer who so wishes may opt for its application. Exercising this option allows the quarterly settlement period to be maintained. You must remain in the system for at least the calendar year for which the option is exercised. The option to apply the SII can be made at any time, including from the day after the settlement period in which said option was exercised ends.

Advantages of the system

• Quality information is available in a short enough time interval to streamline the VAT management system.

• Obtaining “Tax Data”, since the taxpayer has a “declared” Registry Book and another “verified” one in the AEAT electronic office with the verification information from third parties belonging to the group of this system or from the AEAT database.

  Taxpayers can verify this information before the deadline for submitting their VAT return.

  The taxpayer will be able to correct any error committed in filed returns without needing to be required to do so by the Tax Agency.

• Reduction in information requests from the AEAT, since many of the requests are aimed at requesting registration books, invoices or data contained therein to verify certain operations.

• It modernises and standardises the method of keeping traditional VAT Record Books.

• Reduction of formal obligations, eliminating the obligation to submit forms 347 and 390.

• Reduction in terms for filing VAT returns, since the Tax Agency has the information on transactions in almost real time and in greater detail.