What Is myDATA – Complete Guide for Businesses & Accountants
The transition to the digital tax era has fundamentally changed the way businesses and accounting firms operate. myDATA forms the foundation of this transformation; however, it is no longer sufficient on its own.
Full compliance now requires the use of an Electronic Invoicing Provider.
Why an Electronic Invoicing Provider Is Now Required
Mandatory electronic invoicing does not replace a company’s ERP or commercial software.
The issuance of the document continues to take place within the company’s own system.
The Electronic Invoicing Provider is responsible for:
• Transmitting invoice data to the Greek Tax Authority (AADE) via myDATA
• Validating accuracy and compliance with AADE specifications
• Authenticating the invoice
• Receiving and returning the Unique Registration Number (M.A.R.K.)
• Generating and returning the QR Code
• Creating and managing the invoice in the standardized electronic invoice format as defined by the regulatory framework
• Secure archiving and full traceability of the transaction
Without an Electronic Invoicing Provider, a business cannot fully comply with the technical and legal framework of electronic invoicing, which becomes fully mandatory from 2026.
👉 For a detailed implementation timeline and full preparation guidance, see the Electronic Invoicing 2026 Guide.
How e-timologiera Simplifies Electronic Invoicing
e-timologiera is not just another provider. It is a complete electronic invoicing platform designed to address both the technical and business needs of the new digital era.
The e-timologiera solution:
• Operates as an AADE-certified Electronic Invoicing Provider
• Ensures full compliance with myDATA and the applicable regulatory framework
• Supports B2B, B2G, and B2C transactions
• Provides the standardized electronic invoice format in accordance with official specifications
• Automatically manages transmission, authentication, M.A.R.K., QR Code generation, and archiving
• Offers a modern REST API for seamless integration with ERP and commercial systems
• Includes a sandbox environment and technical support for IT companies and software houses
With e-timologiera, businesses and accountants gain full control, security, and transparency throughout the electronic invoicing process—without the risk of non-compliance or technical issues.
For a technical overview of ERP-to-provider integration, see the guide:How to Connect Your ERP…
myDATA is only the beginning.
True compliance starts with an Electronic Invoicing Provider.
👉 Developers & ERP companies can explore: