Is your company ready for the SII?
Everything you need to know about the Immediate Supply of Information (SII)
NEW PLATFORM
Axional SII
Deister introduces its new Axional SII platform (On-Demand or On-Premise), certified by the Spanish Tax Agency, ensuring full integration with the AEAT as well as with the regional tax authorities in the Basque Country, Navarre, and the Canary Islands. It guarantees real-time exchange of your commercial transactions. As an AEAT-certified partner, Deister is authorized to submit invoices without requiring an active digital certificate, simplifying your day-to-day administrative procedures and ensuring full compliance with evolving legal regulations.
On_demand o On_Premise
Certified by the Tax Agency
(SII) Suministro Inmediato de Información es un procedimiento más ágil y moderno de gestión telemática de los libros de registro contables.
A través de la Sede Electrónica de la Agencia Tributaria (AEAT), las empresas tendrán que suministrar los registros de facturación (no las facturas) de forma electrónica.
Con esta información, la AEAT irá configurando, a tiempo real, los distintos Libros Registro.
Large companies with an annual turnover exceeding 6 million euros.
Companies registered in the REDEME (Monthly VAT Refund Scheme).
SMEs and self-employed individuals who are part of the special VAT group regime.
Optionally, any other taxpayer who does not meet the above requirements may choose to adopt the new system.
You will have more time to file your periodic tax returns — an additional 10 days.
It will no longer be necessary to submit forms 340, 347, and 390.
You will face fewer information requests from the AEAT, as they will now have detailed access to the content of your invoices.
Errors will be reduced, as the Electronic Headquarters will have each company's tax data to generate a VAT draft and simplify its filing.
What is it?
When does it come into effect?
Who is required to comply?
Benefits for your company
Turn the change into an opportunity to improve your business management.
How it works
Issuing and recording of invoices
Sales invoices are issued and purchase invoices are recorded in the accounting system/ERP following the usual procedures.
Customer and supplier invoices are posted following the current processes.
Axional FI-SII
Envío a la EAT
- Full acceptance.
- Partial acceptance.
- Full rejection.
Issuing and recording of invoices
Sales invoices are issued and purchase invoices are recorded in the accounting system/ERP following the usual procedures. Customer and supplier invoices are posted following the current processes.Axional FI-SII
The new Axional FI-SII module maps invoices and tax records to convert the data into the format required by the AEAT. Gestione en todo momento las facturas declaradas, las pendientes de declaración, el estado de los envíos y las repuestas a los envíos de la información, controlando la trazabilidad de las gestiones de modificación y baja de datos. Más información de Axional FI-SII.Envío a la EAT
Once converted, the data is sent to the Electronic Headquarters of the AEAT. Una vez comprobado, la entidad devolverá los datos enviado con uno de los siguientes estados:- Full acceptance.
- Partial acceptance.
- Full rejection.

Get your business ready for the change
- Check if you are required to manage your VAT record books.
- Keep your accounting up to date and start recording invoices in less time.
- Get trained in advance to fully understand this innovative management system.
- Aunque no estés obligado, puedes optar por acogerte voluntariamente al SII, quedando de esta forma exonerado de presentar el modelo 340, 347 y 390.
- Check with your software provider whether your invoicing and/or accounting solution is adapted to the change.
It can run in the cloud or be installed on your own servers.
01
No need to change your ERP.
Axional SII is a solution that adapts to each company based on its needs.
02
Your data always remains your property.
03
Assisted installation and training
Our team of specialized consultants will support you throughout the entire installation and training process of the solution.
01
No need to change your ERP.
Axional SII es una solución que se adapta a cada empresa en función de sus necesidades.02
Los datos siempre son de su propiedad
Axional SII se puede instalar en sus servidores locales o puede contratar nuestros servicios cloud, pero siempre garantizamos la seguridad y privacidad de sus datos.03
Assisted installation and training
Our team of specialized consultants will support you throughout the entire installation and training process of the solution.Benefits of the Axional SII platform
for VAT management
Allows management of multiple companies.

Informative portal to maintain constant visibility of your invoice status.
Frequently Asked Questions (FAQ)
The Immediate Supply of Information (SII) is a new system for maintaining VAT record books through the AEAT’s Electronic Headquarters, by submitting billing records in near real-time. In this way, the new SII brings the recording or accounting of invoices closer to the actual time the underlying economic transaction takes place. AEAT, mediante el suministro cuasi inmediato de los registros de facturación. De esta forma, el nuevo SII permite acercar el momento del registro o contabilización de las facturas al de la realización efectiva de la operación económica que subyace a las mismas.
The SII has been mandatory since July 1, 2017, for taxpayers currently required to file VAT returns on a monthly basis (around 63,000 entities), including:
- Large companies (annual turnover over 6 million euros).
- VAT groups.
- Registered in REDEME (Monthly VAT Refund Scheme).
- Taxpayers who voluntarily choose to adopt the new system.
Yes. There will be an option to join the system for those taxpayers who wish to benefit from its advantages, even if they do not meet the mandatory requirements.
The main obligation is that companies must submit their billing records, as well as the declaration of other operations, electronically and immediately through the AEAT’s Electronic Headquarters.
You will need to check whether you are required to manage your VAT record books electronically. If so, keep your accounting up to date and ensure your invoices are properly recorded with reliable accounting software. Additionally, it is advisable to get trained in advance to fully understand this new telematic VAT management system.
Keep in mind that the SII will maintain a repository of record books to instantly match incoming and outgoing invoice data (Forms 340, 347, and 390). Data verification will be faster, as the Tax Agency will receive the information in real time. You’ll save time by no longer needing to manually maintain VAT record books, since the AEAT will update them automatically with the data provided by the taxpayer. Additionally, there will be fewer errors, as the AEAT will generate a sort of "VAT draft" based on this information for companies.