Is your company ready for the SII?
NEW PLATFORM
Axional SII
On_demand oOn_Premise
Certified by the Tax Agency
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.
Since July 1, 2017, the Immediate Supply of Information (SII) has been in effect and requires certain taxpayers to file their VAT self-assessments electronically. Specifically, the system applies to:
- Large companies (annual turnover over 6 million euros).
- VAT groups.
- Registered in REDEME (Monthly VAT Refund Scheme).
In addition, taxpayers who are not required to participate may voluntarily join the system and benefit from its advantages.
Axional ERP is a robust and reliable solution that simplifies compliance with the Immediate Supply of Information (SII) system.
By managing the SII with Axional ERP, your company gains benefits such as:
- Agility and automation: send billing and transaction records in real time directly to the Spanish Tax Agency (AEAT).
- Error reduction: the system validates and corrects data before submission, ensuring greater accuracy.
- Time savings: eliminates manual processes and reduces administrative workload.
- Guaranteed compliance: always kept up to date with the latest SII regulatory changes.
What is it?
When does it come into effect?
Who is required to comply?
Benefits for your company
How it works
Issuing and recording of invoices
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. Manage at all times the invoices already reported, those pending submission, the status of transmissions, and the responses received — while maintaining full traceability of data modification and deletion processes. Learn more about Axional FI-SII.Envío a la EAT
Once converted, the data is sent to the Electronic Headquarters of the AEAT. Once verified, the agency will return the submitted data with one of the following statuses:- Full acceptance.
- Partial acceptance.
- Full rejection.

Prepare your company for the change
- Compruebe si está obligado a gestionar sus libros de registro de IVA.
- Keep your accounting up to date and start recording invoices in a shorter period of time.
- Get trained in advance to fully understand this innovative management system.
- Although not required, you may choose to voluntarily join the SII, thereby being exempt from filing forms 340, 347, and 390.
- Check with your software provider to confirm whether your billing and/or accounting solution is adapted to the change.
It can run in the cloud or be installed on your own servers.
01
Without the need to
change your ERP
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
Without the need to
change your ERP
Axional SII is a solution that adapts to each company based on its specific needs. 02
Los datos siempre son de su propiedad
Axional SII can be installed on your local servers or through our cloud services, while always ensuring the security and privacy of your data.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 keeping VAT record books through the Electronic Headquarters of the AEAT, by means of the near real-time submission of billing records. In this way, the new SII brings the recording or accounting of invoices closer to the actual moment when the underlying economic transaction takes place.
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.



