Email Invoice for Greece

Greece's e-invoicing regulations are a cornerstone of its digital tax transformation, aiming to enhance transparency, combat tax evasion, and streamline financial reporting. The Independent Authority for Public Revenue (IAPR), also known as AADE, oversees this framework, which mandates the digital transmission of invoice and accounting data. The core of this system is the MyData platform, a national digital platform for e-reporting that all companies established in Greece and subject to Greek accounting standards are required to use.

For Business-to-Government (B2G) transactions, e-invoicing has been mandatory in phases, with all public sector entities required to receive electronic invoices since April 18, 2020. Suppliers to public administrations have been obliged to issue e-invoices in accordance with European standards since September 12, 2023, for certain ministries and entities, and this expanded to all public sector contracts by January 1, 2025. These B2G invoices must be transmitted through the Peppol network.

For Business-to-Business (B2B) transactions, mandatory e-invoicing is being phased in. The EU Council authorized Greece to implement mandatory B2B e-invoicing in February 2023. Large companies with annual revenues exceeding €1 million in the 2023 financial year must begin mandatory e-invoicing from March 2, 2026. All other businesses will follow from October 1, 2026. While e-invoicing for transactions with companies within the European Union remains optional for the foreign counterpart, domestic B2B transactions will require mandatory acceptance of e-invoices by the receiving company.

Achieving compliance with Greek e-invoicing regulations involves a structured approach, primarily centered around the MyData platform. The Independent Authority for Public Revenue (AADE) mandates that all companies operating under Greek accounting standards report their accounting data to MyData.

• Declare your E-Invoicing Method: Before issuing e-invoices, businesses must submit a declaration to AADE, indicating their chosen e-invoicing transmission method. This could be through a certified e-invoicing service provider or by utilizing AADE's free applications like "Timologio" or "myDATAapp".
• Generate Invoices in Accepted Formats: Invoices must be created in a structured electronic format, such as EN 16931 XML or Peppol BIS 3.0, which are compliant with Greek specifications.
• Submit to MyData: The generated invoice data must be transmitted to the MyData platform. This can be done in real-time or near real-time, either directly from an ERP system via API, through certified service providers, or for smaller businesses, via a special registration form on the MyData web portal.
• Receive Unique Invoice Identifier (MARK): Upon successful submission and validation by MyData, each invoice receives a unique invoice identifier, known as a MARK. This MARK confirms that the invoice has been officially recorded and validated by the tax authority.
• Deliver to Customer: After receiving the MARK, the issuer is responsible for sending the electronic invoice to the final customer. For B2B transactions, this often involves including the MARK and a mandatory QR code on the document, especially if sent in PDF format. For B2G transactions, the Peppol network is typically used for delivery.

The importance of the unique invoice identifier (MARK) cannot be overstated, as it serves as the validation and clearance model for invoices in Greece, ensuring their legal recognition for tax and accounting purposes.

Compliance with Greek e-invoicing regulations hinges on adhering to specific accepted formats and establishing the necessary technological infrastructure. The primary goal is to ensure that invoices are structured, machine-readable, and can be seamlessly processed by the Independent Authority for Public Revenue's (AADE) MyData platform.

The accepted formats for electronic invoices in Greece are primarily based on European standards:

• EN 16931 XML: This is the European standard for electronic invoicing, which forms the basis for structured electronic invoices in Greece.
• Peppol BIS 3.0: For Business-to-Government (B2G) transactions, the Peppol BIS Billing 3.0 format, adapted to the Greek Core Invoice Usage Specification (CIUS), is mandatory. While not yet mandatory for B2B exchange, it is the adopted standard for B2G.
• UBL 2.1 GR: This XML-based format is also used for B2B clearance and exchange via certified service providers.

The technological infrastructure needed for compliance involves several key components:

• Integration with MyData: Businesses must have systems capable of transmitting invoice data to the MyData platform. This typically involves integrating existing ERP, POS, or billing systems directly via API or using certified e-invoicing service providers who manage this connection.
• Certified Service Providers: For B2G transactions, using certified e-invoicing service providers connected to the Peppol network is mandatory. These providers ensure secure transmission, traceability, and regulatory control. For B2B, businesses can also use certified providers or AADE's free tools.
• Peppol Network Compliance: The Peppol network is the interoperability framework adopted for B2G e-invoicing in Greece. This requires businesses to use accredited Peppol Access Points for document transmission to public entities. While B2B e-invoicing will become mandatory, the exact delivery method (e.g., Peppol for B2B) is still being clarified, though the data must still go to MyData.

Digital signatures are not mandatory but are recommended for ensuring invoice authenticity and integrity.

Greece's e-invoicing journey has been characterized by a phased implementation, with significant milestones already achieved and more on the horizon. The Independent Authority for Public Revenue (AADE) has been progressively rolling out mandates to ensure a smooth transition for businesses.

The implementation timeline for mandatory e-invoicing is as follows:

• B2G E-invoicing: Mandatory for public sector transactions since September 12, 2023, for certain entities, and extended to all public sector contracts by January 1, 2025.
• B2B E-invoicing (Phase 1): Mandatory for large companies with annual revenues exceeding €1 million in the 2023 financial year, starting from March 2, 2026. A gradual implementation period for these businesses will run from March 2, 2026, to May 3, 2026, allowing parallel use of existing systems.
• B2B E-invoicing (Phase 2): All other businesses must comply by October 1, 2026, with a transitional period until December 31, 2026.

Looking ahead, the future of e-invoicing in Greece will involve continuous refinement and expansion of the existing framework. The MyData platform itself is undergoing continuous development to enhance efficiency, interoperability, and data traceability. Future changes and updates in Greek e-invoicing laws are expected to clarify aspects such as invoice delivery methods for B2B transactions, including whether electronic delivery via networks like Peppol will become mandatory for all B2B exchanges, or if PDF with a QR code will remain an option.

The impact of upcoming regulations on businesses is significant. The shift from simply reporting data to MyData to issuing structured electronic invoices through controlled, certified channels represents a major operational change. Businesses that adopt e-invoicing early may benefit from tax incentives, such as enhanced depreciation and increased deductions for e-invoicing-related hardware, software, transmission, and archiving costs. This aligns Greece with broader EU digitalization trends, particularly with the upcoming Digital Reporting Requirements (DRR) under ViDA, which will drive cross-border structured reporting from July 1, 2030.

Noncompliance with Greece's e-invoicing regulations, particularly regarding the MyData platform and mandatory e-invoice issuance, carries significant penalties designed to ensure adherence to the digital tax framework. The Independent Authority for Public Revenue (AADE) views failure to issue an electronic invoice as equivalent to non-issuance of a traditional invoice, triggering various fines and legal implications.

Here are the key penalties for late or missing submissions:

• VAT-liable transactions: For the non-issuance of an electronic invoice for transactions subject to VAT, a penalty equal to 50% of the VAT due on the unissued document is imposed.
• Non-VAT-liable transactions: For non-issuance of an electronic invoice for transactions not subject to VAT, penalties range from €500 per tax audit for taxpayers keeping single-entry accounting systems to €1,000 per tax audit for those keeping double-entry accounting systems.
• Failure to transmit documents to MyData: Lack of transmission of invoices or delivery documents to MyData may result in a penalty between €100 and €20,000 yearly, depending on the business size and accounting system. Additionally, a penalty equal to 10% of the net value of each non-transmitted document, up to €250 per day, may apply for failure to transmit summaries of invoiced revenue and other tax documents.
• Invalid Invoices: Any invoice not issued through the MyData platform or approved channels will not be recognized for VAT deduction or for accounting purposes in Greece.

Legal implications of noncompliance extend beyond monetary fines. Businesses that fail to comply may lose the right to participate in government tenders or public procurement contracts. Repeated violations within five years can lead to doubled or even quadrupled penalties.

To avoid penalties, businesses should implement several strategies:

• Proactive System Integration: Ensure your ERP or accounting software is fully integrated with the MyData platform or utilize a certified e-invoicing service provider well in advance of mandatory deadlines.
• Timely Declarations: Submit the required declaration of your chosen e-invoicing method to AADE by the specified deadlines.
• Staff Training: Train your accounting and sales teams on the new e-invoicing processes, accepted formats, and submission requirements.
• Leverage Transitional Periods: Utilize the gradual implementation periods (e.g., March 2 to May 3, 2026, for large businesses) to finalize technical preparations and test your e-invoicing solution.
• Monitor AADE Guidance: Stay updated on official announcements and technical specifications from AADE, as regulations can evolve.