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Last updated at
December 2, 2025
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Book NowGreece’s Independent Authority for Public Revenue (AADE) has launched the myDATA national electronic invoicing system. E-invoicing for B2G contracts exceeding €2,500 is being implemented in phases, becoming mandatory for all government entities from 1 January 2025. For B2B transactions, it becomes mandatory in phases: from 2 February 2026 for large businesses with 2023 gross revenues over €1 million, and from 1 October 2026 for all other businesses. It changes how companies issue invoices, transmit them securely and validate them with the tax authority.
All applicable taxpayers in Greece including businesses, freelancers and government suppliers must issue invoices through myDATA or an approved integrated solution. Any invoice not submitted through the national platform is invalid for VAT input deduction and accounting. The rules cover B2B, B2C, and B2G transactions, although e-invoicing remains voluntary for B2C transactions.
E-invoicing improves transparency, reduces tax evasion and automates record keeping for businesses and authorities. This blog outlines the system requirements, key deadlines, technical procedures, benefits and how Flick Network helps companies comply efficiently with the new law.
E-invoicing in Greece involves issuing, validating, and storing invoices electronically on the myDATA system instead of paper or simple digital files. Each invoice uses a structured XML or JSON format that follows European Standard EN 16931 and is transmitted securely to AADE for verification.
AADE assigns a unique registration number (MARK) confirming the invoice’s successful reporting. This number appears on the final document shared with the buyer. All invoices are stored electronically, giving the supplier and tax authority access for monitoring and audits.
The myDATA platform or certified third-party software lets sellers generate, send, and track invoices automatically. The system removes manual paperwork, ensures data accuracy, and maintains full traceability of all transactions in Greece.
myDATA (My Digital Accounting and Tax Application) is Greece’s national platform for electronic invoicing and digital tax reporting, managed by AADE. The system connects businesses, freelancers, and government entities to the tax authority in real time, enabling secure submission, validation, and storage of invoices.
For taxpayers, myDATA provides full digital traceability of all business transactions. Every invoice issued must be sent to the platform, which validates the information and assigns a unique registration number (MARK) for official records. This process ensures compliance with the VAT rules, simplifies the accounting of a business and reduces the risk of errors or disputes during audits.
The system applies to all VAT-registered entities in Greece. B2G contracts over €2,500 are mandatory from 1 September 2025. B2B e-invoicing becomes mandatory in phases: from 2 February 2026 for large businesses and from 1 October 2026 for all other businesses. The system is designed to improve transparency, prevent tax evasion, and accelerate the reconciliation of accounts.
2019: Law 4646 of 2019 introduced the legal framework for electronic invoicing and the digital reporting of business transactions in Greece
2020 to 2024: Voluntary adoption of the system and phased registration of certain sectors and large taxpayers
1 September 2025: Mandatory B2G e-invoicing applies to all public contracts over €2,500.
2 February 2026: Mandatory B2B e-invoicing starts for large businesses with gross revenues over €1 million in 2023
1 October 2026: Full enforcement of e-invoicing for all remaining businesses in Greece
The e-invoicing mandate applies primarily to businesses established in Greece that are VAT-registered, including:
Wholesalers, retailers, and service providers
Professionals and freelancers
Importers and exporters
Businesses engaged in public procurement (B2G)
Note: While all VAT-registered entities must report transaction data to myDATA, mandatory issuance of e-invoices depends on the type of transaction and business size:
B2G contracts over €2,500 – mandatory from 1 September 2025
B2B transactions – phased: large businesses from 2 February 2026, remaining businesses from 1 October 2026
B2C transactions – not mandatory
AADE has confirmed that no sector or entity type established in Greece is exempt from participation. Failure to comply can lead to penalties, suspension from tenders, and exclusion from government contracts. Businesses will also lose the right to claim input VAT on invoices not issued through myDATA.
Invoice Format and Digital Receipt: Invoices must be issued in XML format meeting myDATA’s schema requirements. After submission, AADE validates the data and assigns a unique registration number (MARK) confirming verification. This MARK should appear on the customer-facing invoice.
System Integration and API Access: Each taxpayer receives a user ID and a secret key from AADE to authenticate and connect securely via API. Businesses may either connect ERP, POS, or billing systems directly or use integrated service providers like Flick Network to manage API communication.
Invoice Types and Buyer Information: myDATA supports cash invoices (paid instantly) and receivable invoices (payment deferred). All invoices, regardless of amount, must include buyer identification information, which is stored for audit and compliance purposes.
Archiving and Record Keeping: Suppliers must retain all electronic invoices and validation logs in digital archives accessible to AADE during audits. Paper copies are not mandatory once the invoice is validated electronically.
Efficiency: The system automates the issuance of a digital invoice and its validation on the myDATA platform reducing manual work and the time of processing invoices for businesses
Accuracy: Using structured data in XML or JSON format minimizes the risk of human errors in the calculation of taxes and reporting on financial records
Compliance: Real-time access to the full record of transactions strengthens the control of tax authorities and ensures transparency of business operations
Cost Savings: Reduces the use of paper, printing, and physical storage while making preparation for audits faster and simpler
Fraud Prevention: Digital traceable records prevent invoice manipulation and reduce the risk of tax evasion
Faster Reconciliation: Accelerates the reconciliation of accounts and payment cycles improving the management of cash flow
Invalid Invoices: Any invoice not issued on the myDATA platform will not be recognized for VAT deduction or for accounting purposes in Greece
Fines: Businesses may face penalties under the Greek VAT regulations and accounting rules for non-compliance
Ineligibility for Public Contracts: Companies that fail to comply lose the right to participate in government tenders or public procurement contracts
Operational Disruptions: Delays in system integration or errors in electronic invoicing can disrupt the accounting workflow and business operations
Register Early: Sign up on the myDATA platform through AADE to get a user number and a secret key for access
Assess Systems: Confirm that ERP or accounting software can generate invoices in XML or JSON formats required by myDATA
Integrate and Test: Connect the system to the platform through the API and submit sample invoices to verify validation and receipt generation
Train Staff: Guide finance and accounting teams on creating, validating, and storing invoices on the platform
Choose a Provider: Use authorized providers like Flick Network to manage setup, reduce manual work, and maintain compliance
Monitor Compliance: Track submissions, rejections, and validations on the platform and resolve integration issues promptly
Flick Network provides a solution fully compliant for businesses of all sizes in Greece. The platform connects directly to myDATA using secure APIs to ensure seamless integration.
Key features include:
Generate Invoices in the Approved Format: Produces invoices in XML or JSON according to AADE rules including all required fields
Submit and Validate Automatically: Sends invoices to myDATA securely and receives validation responses with digital receipts for official confirmation
Archive and Track Invoices: Stores validated invoices digitally providing traceability for audits reporting and monitoring
Manage Errors and Credit Notes: Handles rejected invoices and corrections on the platform, keeping records accurate and ready for review
High-Volume Processing: Supports processing of thousands of invoices daily without affecting ERP performance
Continuous Support: Offers onboarding monitoring and updates as AADE rules change
Greece’s move to mandatory e-invoicing on the myDATA system improves the management of taxation and business operations. From 1 September 2025 for B2G contracts and from 2 February 2026 to 1 October 2026 for B2B transactions, every invoice must pass through myDATA or an approved platform to be valid for VAT and accounting. Registering on the system and integrating business software helps a company streamline operations, reduce errors and stay compliant with AADE rules.
Platforms like Flick Network manage integration, validation and the protection of invoice data. Early adoption limits disruptions, prevents penalties and ensures efficient transparent digital invoicing across Greece.
1. What is myDATA in Greece?
myDATA is the national system of electronic invoicing and digital tax reporting run by AADE. It allows a business to issue, validate, and store invoices digitally on the platform instead of paper records.
2. Who must comply with the e-invoicing mandate in Greece?
Mandatory e-invoicing applies to VAT-registered businesses established in Greece. Every entity reports transaction data on myDATA. Issuing e-invoices depends on the transaction type and business size. B2G contracts over €2,500 are required from 1 September 2025. B2B invoices follow a phased schedule. B2C invoices do not require submission.
3. What happens if a business does not comply with e-invoicing in Greece?
Invoices issued outside myDATA are invalid for VAT deduction. Non-compliance may result in fines or penalties according to Greek tax rules.
4. How can Flick help with e-invoicing in Greece?
Flick Network links a company’s system to myDATA to submit, validate, and store invoices automatically on the platform while keeping the business aligned with AADE rules.
5. What are the benefits of adopting e-invoicing early in Greece?
Early use allows a business to connect systems efficiently, reduce errors, speed up payments, claim applicable tax incentives, and prepare for changes in digital tax reporting on the platform.
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