E-invoicing regulatory updates May 2026

Belgium – Post‑Mandate Optimisation (19 May)

Key update

Belgium released its first major FAQ update since the B2B mandate went live in January 2026.

What’s changed

• Peppol delays formalised
  • Invoices taking over 1 working day must be investigated
• Reverse charge flexibility introduced
  • Exact legal wording no longer mandatory if intent is clear
• Incorrect invoice handling strengthened
  • Must be rejected via Peppol using official codes
• Audit trail enforcement
  • Incorrect invoices must be corrected via credit notes
• Self‑billing clarified
  • Supplier must be registered on Peppol
• Business impact
  • Enforcement now focused on:
    • data integrity
    • traceability
    • process compliance
  • Businesses must ensure invoice lifecycle control, not just issuance

Romania – Expansion & Simplification (May + June)

Key updates

• Expansion of obligations within RO e‑Factura
• Government-backed simplification amendments

What it means

• Continued rollout toward full CTC coverage
• Balancing:
  • strict reporting requirements
  • improved usability for taxpayers

Business impact

• Increased reporting scope
• Need for tighter integration between ERP and tax systems

Poland – KSeF Legal Alignment (12 May)

Key update

Draft VAT legislation issued to support KSeF e‑invoicing system

Context

• KSeF:
  • centralised clearance model
  • real-time validation and storage
  • Rollout already scheduled across 2026 phases

Business impact

• Organisations must prepare for:
  • central submission workflows
  • real-time validation failures

Slovakia – Multi‑Stage Reform (May + June)

Key updates

• New guidance (6 May)
• VAT Act amendment proposals (29 May)
• Grace period proposal (5 June)

Strategic direction

• Aligning with EU ViDA framework
• Preparing for future mandatory e‑invoicing

Business impact

• Companies operating in Slovakia must:
  • monitor evolving legislation
  • prepare systems early for compliance

Greece – Digital Reporting Strengthened (5 June)

Key update

New law impacting the myDATA reporting platform

Context

Greece already operates real-time reporting infrastructure

Business impact

• Increased integration between:
  • invoicing systems
  • tax authority reporting

UAE – Ecosystem Development (11 May + 5 June)

Key updates

• ASP (Accredited Service Provider) deadline extended to October 2026 [mof.gov.ae]
• Updated national e‑invoicing guidelines issued

Model

• 5‑corner Peppol-style network
  • Service providers act as intermediaries

Business impact

• Mandatory go-live remains January 2027 [mof.gov.ae]
• Companies must:
  • select compliant providers
  • align with evolving technical specifications

Qatar – Legislative Progress (7 May)

Key update

Draft e‑invoicing law approved

Impact

• Moves Qatar into:
• implementation phase
  • Aligns with wider GCC digital tax adoption

Sri Lanka – Accelerated Rollout (18 May)

Key update

Acceleration of national real-time VAT e‑invoicing system

Features

• API-driven integration
• Real-time submission to tax authority

Rollout

• Live for key sectors (e.g. tea industry)
• Full rollout expected by end 2026

Business impact

• Shift to:
  • real-time reporting
  • elimination of manual compliance processes

Malaysia – Iterative Rollout (27 May)

Key update

Updated guidelines v4.7 (technical + FAQ)

Context

• Active rollout phase with frequent updates

Business impact

• Organisations must:
  • continuously update systems
  • track specification changes

Philippines – Infrastructure Development (29 May)

Key update

Launch of a pilot taxpayer portal

Purpose

• Support:
  • invoice submission
  • digital reporting

Business impact

• Early indication of:
  • centralised reporting / clearance system

Kenya – Compliance Clarification (27 May)

Key update

Clarification of reverse invoicing rules under eTIMS

Impact

• Addresses:
  • complex VAT scenarios
  • edge-case compliance

Business impact

• Businesses must ensure:
  • accurate invoice classification
  • correct tax treatment

Burkina Faso – Ecosystem Setup (28 May)

Key update

Launch of enterprise certification framework

Purpose

• Accredit:
  • providers
  • compliant taxpayers

Business impact

• Signals transition toward:
  • controlled e‑invoicing environment

Paraguay – Mandate Expansion (19 May)

Key update

~3,000 additional taxpayers added to e‑invoicing system

Rollout model

• Phased onboarding (2026–2027)

Critical rule

• Immediate cessation of paper invoicing after go-live

Business impact

• Strict enforcement:
  • no hybrid invoicing allowed
  • full digital compliance required

Turkey – System Expansion (27 May)

Key update

Introduction of next-generation e‑document systems

Context

• Already mature e‑invoicing environment

Business impact

• Increased automation capability
• Expanded digital document scope