If you run a physical store using Shopify POS, you may be asking yourself:
Do I need to adapt my business to Verifactu or to SII? Or both? Or neither?
With the implementation of new tax regulations—especially the Anti-Fraud Law—businesses must comply with new requirements that directly affect how receipts and invoices are issued and recorded.
To help you, we’ve clearly explained the differences between Verifactu and the Immediate Supply of Information (SII), and how Comply, integrated with Shopify POS, allows you to comply with both frameworks—without complexity.
What Is Verifactu? And What Is the SII?
Although both systems aim to improve tax traceability and transparency with the Spanish Tax Agency (AEAT), Verifactu and SII are two different systems applied in different contexts:
Verifactu
Requires that every POS transaction generate a traceable, immutable, and verifiable invoice.
Includes visible elements like a QR code.
Applies to all physical points of sale in Spain (except the Basque Country and Navarre) starting January 1, 2026.
Targets retailers, sole traders, and small to medium-sized businesses.
SII (Immediate Supply of Information)
Focuses not on individual invoices but on the data they contain.
Has been mandatory since 2017 for large companies, VAT groups, and businesses in the monthly refund scheme (REDEME).
Requires submission of invoice data within four business days of issuance or receipt.
What Does Comply Offer in Each Case?
If your business is subject to Verifactu
Comply is a certified solution for issuing verifiable invoices from Shopify POS, meeting all the technical requirements of the system:
Chained invoices and sequential numbering
Transaction logging according to Verifactu regulations
QR code and Verifactu compliance notice included on the printed receipt
Structured export for audits
Real-time submission of each invoice to the AEAT
If your business falls under the SII
While Comply does not directly transmit data to the AEAT, it simplifies SII compliance by:
Generating structured invoice records in the required format
Automatically assigning sequential invoice numbers
Enabling structured exports—ideal for your accountant or external accounting software to submit to the SII system
Key Differences: Comply for Verifactu vs. SII
Feature | Verifactu | SII |
Purpose | Secure, traceable invoice issuance with immediate submission to AEAT | Secure, traceable invoice issuance; Comply does not submit data to AEAT |
Obligation Start Date | Mandatory in 2026 for physical points of sale | Mandatory since 2017 for large businesses |
Visible Format | Invoice number, invoice type, customer data (for full invoices), QR code | Invoice number, invoice type, customer data (for full invoices) |
Scope | All businesses issuing invoices at POS | Companies with turnover > €6M, VAT groups, REDEME scheme |
Submission Frequency | Immediate and automatic | Within 4 business days after issuance; submitted manually through your current SII-linked software |
AEAT Integration | Comply acts as a certified Social Collaborator | Submission is handled by external accounting software |
Shopify POS Integration | Natively integrated with Comply | Natively integrated with Comply |