What is the SII, and how does it work?

The Immediate Supply of Information system (SII in Spanish) is an AEAT platform for electronically managing VAT ledgers by sending data almost in real time. It enables invoice, capital goods, and intra-EU transaction reporting within very short deadlines, improving accuracy and reducing traditional tax procedures.

Which invoices must be sent to SII and within what deadline?

Issued and received invoice data, capital goods records, and intra-EU transactions must be reported. Information is generally sent within a maximum of four business days from issuance or accounting.

Who must comply with the SII in Spain?

The SII is mandatory for: * Large companies with annual turnover above 6 million euros * Companies under the monthly VAT refund regime * VAT groups * Other taxpayers who voluntarily opt in

What is the difference between SII and Verifactu?

SII is a real-time VAT reporting system to the AEAT. Verifactu is a regulation within invoicing software systems requiring digital signatures, QR codes, and invoice traceability, and may include automatic data submission. Verifactu is a software standard, while SII is a VAT reporting scheme.

What are the benefits of automating SII via API?

* Continuous tax compliance with AEAT * Reduced administrative workload * Fewer human errors and rejected files * Direct ERP, POS, and invoicing integration * Preparation for Verifactu and NaTicket * It is the most scalable option for software providers

fiskaly SIGN ES: one API for SII in Spain

fiskaly SIGN ES helps you comply with SII (Immediate Supply of Information) and other Spanish fiscal regulations through a single, secure, automated API integration.

Integrated and effortless SII compliance

SII requires VAT records to be sent to the AEAT almost in real time. With fiskaly SIGN ES, you comply easily without adding new integrations.

Features of fiskaly SIGN ES for the SII

An API for developers and software vendors

SIGN ES integrates easily with any invoicing, ERP, or POS system, adapting to your existing infrastructure without rewriting code.

Real time VAT record submission to AEAT

Automate invoice and VAT record reporting in real time, meeting SII requirements without manual processes.

Avoid errors and rejected files

Our API pre-validation system prevents Tax Agency rejections, reduces support tickets, and ensures a smooth, error-free experience.

Certified security you can trust

Our API is ISO 27001 and ISO 9001 certified, ensuring full privacy, integrity, and protection for every fiscal record.

Expert technical support in fiscal compliance

Our specialized team supports you throughout the entire process, from integration to daily SII and fiscal operations.

One integration, multiple regulations

With one API you comply with SII and scale your software to meet TicketBAI, Verifactu, and NaTicket requirements without extra development.

FAQs about SII

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