Saudi Arabia continues its digital tax transformation with ZATCA Phase 2 e-invoicing (Integration Phase). This requires VAT-registered businesses to integrate their invoicing systems directly with the Fatoora platform, generate compliant XML invoices, and enable real-time reporting. Waves 18–22 target businesses with progressively lower annual revenues in 2026, building on earlier waves (such as Wave 16 and Wave 17).

Phase 1 vs Phase 2

Phase 1 (launched December 2021) focused on generating and storing invoices electronically. Phase 2 goes further by mandating direct integration with Fatoora, real-time clearance/reporting, and enhanced security.

Phase 2 Core Requirements

Businesses must:

• Integrate invoicing/ERP systems with the Fatoora platform
• Generate invoices in compliant XML format
• Include all mandatory fields, cryptographic stamps, and UUIDs
• Apply QR codes on simplified invoices
• Clear and report invoices in real time
• Store invoices securely with tamper protection

ZATCA Waves 18–22 Timeline (2023–2026)

Waves are rolled out by annual revenue thresholds, starting with larger taxpayers and expanding to SMEs.

• Wave 18: Targeted VAT-registered businesses above a specified revenue threshold. Required full Fatoora integration, XML invoicing, cryptographic stamps, UUIDs, QR codes, and archiving/reporting.
• Wave 19: Expanded to organizations with lower revenues, pushing more SMEs toward real-time compliance. Common challenges included API connectivity, XML formatting, and ERP limitations.
• Wave 20: Increased focus on data accuracy, invoice authenticity, and reporting transparency. Emphasized real-time reporting, secure storage, and tamper-resistant systems. Multi-branch operations benefited from ERP integration.
• Wave 21: Raised expectations for operational consistency, continuous synchronization, and integration with inventory/sales systems. Particularly affected high-volume and complex businesses.
• Wave 22: Further widened inclusion to smaller SMEs, reinforcing that compliant e-invoicing is now mandatory for businesses of all sizes.

Why ERP Integration Matters

Modern ERP systems enable automated XML generation, real-time Fatoora connectivity, reduced errors, centralized reporting, and better audit readiness. Legacy systems often need upgrades or replacement.

ERP-Fatoora Integration Steps

• Assess systems – Check current ERP for XML support, API connectivity, and compliance capabilities.
• Select compliant solution – Choose systems offering automated updates, scalability, and multi-branch support.
• Configure integration – Set up API connections, authentication, certificates, and device registration.
• Test thoroughly – Validate invoice generation, XML compliance, reporting, clearance, and error handling.
• Train teams – Ensure finance, accounting, and IT staff understand workflows, validation, and reporting processes.

Technical Requirements

• Structured XML invoices with seller details, VAT, line items, tax amounts, UUIDs, and digital signatures
• Cryptographic stamping for authenticity
• QR codes on simplified invoices
• Real-time clearance and reporting via Fatoora
• Secure archiving for the required retention period

Penalties and Waivers

ZATCA offers penalty waiver programs in 2026 for businesses that voluntarily register, correct violations, settle taxes, and complete integration. However, non-compliance can still lead to financial penalties, operational disruptions, audits, and increased scrutiny. Early preparation is strongly recommended to avoid risks.