Greece myDATA Expands: B2B Cross-Border Invoice Reporting Now Mandatory
Greece's IAPR has expanded mandatory myDATA digital reporting to include cross-border B2B invoices for Greek VAT-registered businesses, closing a significant loophole that previously allowed international transactions to bypass the real-time reporting system.
Greece's Independent Authority for Public Revenue (IAPR / AADE) announced on 12 May 2026 an expansion of the mandatory myDATA (digital accounting books) reporting system to include cross-border B2B invoices — effective from 1 July 2026.
Background: What Is myDATA?
Greece introduced myDATA (My Digital Accounting and Tax Application) in 2021 as a real-time digital reporting system for domestic B2B transactions. Every Greek business must transmit invoice and accounting entry data to the IAPR's cloud platform within specified timeframes.
Unlike Italy's SDI or Poland's KSeF, myDATA is not a clearing house — it is a parallel reporting system. Businesses still exchange invoices in whatever format they choose (PDF, XML, etc.), but they must simultaneously transmit summary invoice data to myDATA.
As of January 2024, myDATA was mandatory for all domestic B2B transactions. The July 2026 extension brings cross-border transactions into scope.
What Changes from 1 July 2026
From 1 July 2026, Greek VAT-registered businesses must report to myDATA:
- All intra-EU B2B sales invoices within 24 hours of issuance
- All third-country (non-EU) export invoices within 48 hours
- Intra-EU acquisitions — purchase invoices from EU suppliers, within 30 days of receipt
This captures virtually all B2B invoice activity by Greek businesses, domestic and international.
Technical Requirements
myDATA reporting uses the IAPR's REST API or certified ERP integrations. The invoice data transmitted includes:
| Field | Description |
| MARK | Unique IAPR registration number (assigned on transmission) |
| Issuer/Counterpart | VAT numbers, country codes |
| Invoice type code | Mandatory IAPR codelist |
| Net amount, VAT per rate | Broken down by VAT category |
| Tax classification | Required for VAT returns integration |
If the MARK is not obtained within the statutory window, the invoice is not legally recognised for VAT purposes.
Impact on Foreign Businesses with Greek VAT
Foreign businesses with a Greek VAT registration (AFM) are fully subject to myDATA for all their Greek-domestic transactions. The July 2026 extension adds cross-border obligations.
Most Greek accountants and fiscal representatives handle myDATA reporting on behalf of their clients. If you have a Greek fiscal representative, confirm they are equipped for the expanded scope.
Key ERP and Accounting Integrations
Major ERP vendors — SAP, Oracle, and Microsoft Dynamics — have myDATA modules available. Certified Greek accounting software providers including ERP CLOUD (Epsilon Net), Entersoft, and SoftOne have been myDATA-compliant since the 2021 launch and have added cross-border reporting functionality ahead of the July 2026 deadline.
Source
IAPR/AADE official announcement, May 2026: aade.gr
