The Immediate Information Supply, also known as the SII, is a system of the Tax Agency by means of which the Value Added Tax (VAT) record books are kept almost immediately. This is carried out through the Tax Agency's own web page.
It is through the need to streamline the VAT management processes that the SII is born, being a way to adapt to the digital environment, increasingly present in companies. More and more initiatives are being carried out with the intention of speeding up the digitalization of companies, other examples of these are the Anti-fraud and Crea y Crece laws, from which new forms of invoicing are born, such as the Verifactu system or electronic invoicing.
In short, the Immediate Information Provision is intended for taxpayers who are in a position to comply with the application of the SII to communicate the invoicing data within a maximum of four working days from the date of issue of the invoice.
Who is required to submit it?
The presentation of invoices through the SII is not mandatory for all companies, however, currently, there are four cases in which the VAT registration book declaration is required.
In this case, companies registered in the VAT Monthly Return Register, better known as REDEME, are obliged to file. Also those companies with a turnover of more than 6 million euros, since they are obliged to file the monthly Value Added Tax self-assessment. Likewise, companies under the special regime of the VAT/IGIC group of entities are also obliged to file it.
Finally, as from January 1, 2025, the holders of fiscal deposits of gasoline, diesel or biofuels included in the objective scope of the Hydrocarbon Tax have been added, as well as the businessmen or professionals who extract these products from the fiscal deposits.
For the rest of the companies, the presentation of invoices through the SII is optional, however, the presentation of the same has certain advantages.
Advantages of SII
Among the advantages, we have the efficiency in terms of time and the modernization, digitalization and standardization of the way of keeping the traditional VAT Registration Books. In recent years, there have been numerous initiatives by the government to favor digitalization, and this is one of them.
In addition, in the case of submitting invoices through the SII, doing so exempts the company from having to file forms 347, 340 and 390, which speeds up the work and saves time and resources.
In case of not complying with the sending through the SII being a company obliged to do so, penalties such as fines or interests in the declaration may be received.
SII's submission and Odoo's offer
For the submission of VAT registration books, in the case of the SII it is done almost immediately. In this case, the presentation must be made within a maximum period of 4 days from the accounting registration of the invoice. In any case, it must always be done before the 16th day of the following month in which the corresponding operations have been included. That is to say, once the month has ended, there is a maximum of 16 days for the presentation of the invoices.
The submission of VAT registration books must be done through the Tax Agency's website. In the case of Odoo, it is possible to do it directly from the system itself, simply the invoice created will be sent automatically to the database of the Tax Agency.
For this, it will only be necessary to download the Immediate Information Supply module and make the corresponding configuration, the company's certificate for this case. Any invoice posted during the day will be sent at midnight fully automatically.
Finally, we must not confuse the Immediate Information Supply with the Veri*Factu system. The latter is a new initiative born out of the Anti-Fraud law, with a very similar operation. In the case of Veri*Factu, all companies that are not obliged to send the SII will have to use this platform, you can read more about how it will work here.
Suministro de Información Inmediata (SII) in Spain