The AEAT SII in Odoo: immediate supply of VAT information

The SII (Immediate Supply of Information) requires certain companies to submit their invoicing records to Spain's tax authority (AEAT) in near real time. If it applies to you, your Odoo must send them automatically and error-free.

What is the SII?

It's a VAT management system based on the electronic submission of the record books (issued invoices, received invoices, investment goods and intra-community operations) through the AEAT's electronic office, generally within 4 business days of issuing or recording the invoice.

Who it applies to

It is mandatory, primarily, for:

• Large companies (turnover above €6,010,121.04 the previous year).
• Businesses registered in the REDEME (monthly VAT refund register).
• VAT groups.

Everyone else may opt in voluntarily.

How it fits into Odoo

Compliance relies on the Spanish localization and the SII module:

1. Correct Spanish fiscal localization and chart of accounts.
2. SII module enabled and the company digital certificate loaded.
3. Correct mapping of VAT types, operation keys and regime on products and partners.
4. Automatic submission of the books after validating invoices, with handling of the AEAT responses (accepted / accepted with errors / rejected).
5. Management of resubmissions and corrections when errors occur.

The detail that fails most

The SII is very strict about data quality: a wrong operation key or an incorrect tax ID triggers rejections. Good initial setup in Odoo saves hours of manual correction every month.

SII, Verifactu and TicketBAI

Don't confuse them: the SII sends the VAT record books to the AEAT; Verifactu ensures the integrity of invoicing records nationwide; and TicketBAI applies in the Basque Country. A company may be subject to more than one, and in Odoo each has its own configuration.

Conclusion

If the SII applies to you, automating it in Odoo saves manual submission and reduces the risk of penalties for missed deadlines. We can review your obligation, configure the module and get submission working with error handling.