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Greece's e-invoicing regulation timeline

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Executive summary

Greece mandates e-reporting through the myDATA (My Digital Accounting and Tax Application) platform, managed by the Independent Authority for Public Revenue (IAPR). This system requires businesses to report invoices and accounting data in real time, ensuring compliance with Greek tax regulations and enabling automatic generation of electronic accounting books. Invopop has partnered with ILYDA to issue invoices in Greece. Each supplier must be registered with ILYDA to issue invoices on their behalf. Starting in February 2026, companies with revenues exceeding €1 million in the 2023 fiscal year will be required to issue electronic invoices for domestic B2B transactions and transactions with companies from third countries (outside the European Union). All other businesses must comply by October 1, 2026. Consult our Greece’s e-invoicing regulation timeline for an overview of upcoming regulation in Greece. Greece’s e-invoicing system is based on the EN 16931 standard with CUIS extensions, requiring invoices in XML format. The system uses a hybrid infrastructure model combining public and private platforms, with centralized validation and tracking through myDATA. Invopop provides comprehensive coverage for Greek invoicing through the ILYDA Greece app, as well as integrations with platforms like Stripe and Chargebee. This allows businesses to issue compliant EN 16931 invoices efficiently and manage white-label (B2B2B) operations.

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Greece

The myDATA (My Digital Accounting and Tax Application) platform is Greece’s standardized electronic invoicing and bookkeeping system, managed by the Independent Authority for Public Revenue (IAPR). This system enables businesses to report invoices and accounting data in real time, ensuring compliance with Greek tax regulations. Starting in February 2026, companies with revenues exceeding €1 million in the 2023 fiscal year in Greece will be required to issue electronic invoices for the sale of goods and provision of services within the country, as well as for transactions with companies from third countries (outside the European Union). All other businesses will follow on October 1, 2026. Consult our Greece’s e-invoicing regulation timeline for an overview of upcoming regulation in Greece.
EN 16931 is the European standard that defines the semantic data model for electronic invoices. It establishes a common structure and set of data elements to ensure interoperability across countries, systems, and sectors within the EU. The standard allows implementations in syntaxes like UBL or CII. Its goal is to simplify cross-border trade, reduce administrative costs, and support the digital transformation of public and private procurement across Europe.
ModelsB2C, B2B, B2G
FormatEN 16931 + CUIS (XML)
InfrastructureHybrid: public and private platforms
ModelCentralized
Scope & DeadlineFebruary 2026 for companies > €1M, Oct 2026 for all other businesses.
AgencyIAPR
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E-reporting

E-reporting is the mandatory electronic submission of invoice data to tax authorities, usually in real time, for compliance and audit purposes. This enables tax administrations to monitor transactions and ensure VAT control as part of broader continuous transaction control (CTC) systems. All companies resident in Greece (or in any event subject to local accounting requirements) have to comply with the system, with no threshold foreseen. The taxable person with a turnover of less than EUR 50.000 or issuing less than 50 invoices per year will be able to use a special data entry form, which allows them to manually upload invoice data on the myDATA web portal.
myDATA is Greece’s real-time electronic invoicing and reporting platform that digitizes accounting data for B2G, B2B, and B2C transactions. Companies must send transaction and accounting data to myDATA, which validates it and assigns a unique identifier (MARK). The system automatically generates electronic accounting books (a detailed book and a summary book) and is crucial for tax compliance.
FormatN 16931 + CUIS (XML)
Scope & deadlineGreek taxpayers have been subject to real-time e-reporting regime since 2021, having to upload tax transactions and delivery notes to myDATA.
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Regulation

The main eInvoice process flow scenario for public procurement is the following:
  1. Preparation of eInvoice data by the supplier/contractor and transmission to an eInvoicing service provider.
  2. The eInvoicing service provider validates invoice data before submitting it, using the respective Interoperability Centre services.
  3. The eInvoicing service provider reports and registers the eInvoice, for taxation reasons, to “MyData” application i.e. to a digital financial information application for taxation operated by the Independent Authority of Public Revenue in Greece.
  4. The eInvoicing service provider prepares the eInvoice based on the European standard semantic model, the national specification that derives from the Joint Ministerial Decisions, and the Peppol Business Interoperability Specification.
  5. The eInvoicing service provider submits the eInvoice to the access point of the Interoperability Centre through the Peppol network.
  6. The Interoperability Centre receives and validates the eInvoice, according to the European and national rules for eInvoicing,
  7. The Interoperability Centre routes the eInvoice to the competent contracting authority or competent IT system of the public body,
  8. The competent contracting authority and financial service handle the invoice according to their internal procurement and payment practices using one of the IT systems or web application mentioned in the previous section. The competent authorities send the appropriate messages regarding the status of the processing of the eInvoice through the Interoperability Centre and the eInvoicing service providers to the supplier/contractor.
Greece requires archiving invoices during 5 years.
Invopop has partnered with ILYDA to issue invoices in Greece. Each supplier must be registered with ILYDA to issue invoices on their behalf. This involves:
  • Authorizing ILYDA as an electronic invoicing provider in Taxisnet.
  • Declaring ILYDA as invoice issuer in myDATA.
  • Signing a service provision agreement with ILYDA.
  • Please contact us via Slack or [email protected] whenever you need to onboard a new supplier. We will walk you through the process.
Supplier registration is only possible in production. In the sandbox environment, your invoices must use a supplier with the tax ID code set to 177472438 which is the TIN of the test supplier pre-enabled in that environment.

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