Greece’s myDATA Mandate Live From 1 October With a Revised Timeline

Joanna Hysi
October 15, 2021

The myDATA mandate finally went live on 1 October 2021 for most taxpayers after several postponements (and lobbying for a further postponement).

The Greek authorities have stated that no penalties will be imposed for 2021 until relevant legislation is published. The primary goal of the authorities is to ensure all taxpayers are in a position to comply with the myDATA requirements, legal and technical, and can adapt to the new continuous transaction control (CTC) system.

Timeline for myDATA compliance

For 2020, myDATA compliance remains voluntary.

On 1 October 2020, myDATA was classified as voluntary scheme for 2020; except for taxpayers who, as of July 2020, opted for e-invoicing through a certified e-invoicing service provider. In cases of voluntary adoption via other transmission methods, e.g. ERP, companies could opt to send only data of the final calendar quarter of 2020 (October – December).

For 2021, myDATA becomes mandatory for certain taxpayers and transactions.

The mandate covers only income transactions. Expenses may be transmitted to myDATA anytime until 31 May 2022.

  • The first phase of the mandate starts on 1 October 2021 and applies to taxpayers with double entry books and revenue, in financial year 2019, over 50.000 EUR as well as taxpayers with single entry books and revenue over 100.000 EUR.
  • The second phase of the mandate starts on 1 November 2021 and extends to all other taxpayers.

For 2022, myDATA is expected to become mandatory for all.

  • From 1 January 2022, the myDATA mandate extends to all data (summary and classifications) of revenue and expenses.
  • All historical (income) data, i.e. data issued between 1 January – 30 September 2021 or 31 October 2021, must be transmitted to myDATA by 31 March 2022. In case of non-transmission of the above data by the invoice issuer, these may be reported by the recipient from 1 April – 30 April 2022 while the issuer may accept and classify such transactions by 31 May 2022.
  • Accounting (adjustment) entries for revenue must be reported by the deadline of filing the annual income return of financial year 2021 (respective entries for expenses may be transmitted by the same deadline).

The myDATA framework seems to be taking shape in time for its scheduled full implementation next year. However, additional clarifications are still expected regarding certain matters, such as the transmission process of expense classifications by a certified accountant or the upgrade and interconnection process of Greek cash registers (Φ.Η.Μ) with myDATA.

Take Action

Contact us to discuss how we can help your business comply with Greece’s myDATA requirements. Follow us on LinkedIn and Twitter to keep up-to-date with the latest regulatory news and updates.

Sign up for Email Updates

Stay up to date with the latest tax and compliance updates that may impact your business.


Joanna Hysi

Joanna is a Senior Regulatory Counsel at Sovos. Based in Stockholm and originally from Greece, Joanna’s background is in commercial and corporate law with research focus on EU law and financial innovation. Joanna earned her degree in Law in Greece and her masters in Commercial and Corporate from London School of Economics and Political Science (LSE) in London.
Share This Post

North America ShipCompliant
May 25, 2023
Out-of-State Breweries Gain Self Distribution, DtC Rights in Oregon

Under a settlement agreement, breweries located outside of Oregon now have more options for selling into the Beaver State, including direct-to-consumer (DtC) shipping and self-distribution to retailers. The settlement arose out of a lawsuit filed by a group of Washington breweries last year challenging Oregon laws that limited beer self-distribution to in-state breweries and DtC […]

EMEA VAT & Fiscal Reporting
May 24, 2023
VAT and Art: What you need to know

Significant inflation increases have impacted most of the world’s economies, with the UK still above 10% in 2023. This increase means a reduction in the purchasing power of consumers. Together with increases in the cost of raw materials, this has created uncertainty regarding growth of entire industrial departments and reduced profit margins for companies. The […]

North America ShipCompliant
May 23, 2023
Top 5 Myths Surrounding Retailer Direct-to-Consumer Wine Shipping

By Tom Wark, Executive Director, National Association of Wine Retailers Politics breed myths. This has always been the case as politics is, at its most fundamental, a form of storytelling. So it should be no surprise that myths have arisen as various elements of the wine industry have fought against consumers and specialty wine retailer seeking […]

May 23, 2023
IPT: Location of Risk and Territoriality

Much of the discussion on the Location of Risk triggering a country’s entitlement to levy insurance premium tax (IPT) and parafiscal charges focuses on the rules for different types of insurance. European Union (EU) Directive 2009/138/EC (Solvency II) set out these rules. However, a related topic of growing importance in this area concerns territoriality, i.e. […]

Asia Pacific E-Invoicing Compliance
May 23, 2023
Japan: New e-Invoice Retention Requirements

Japan’s new e-invoice retention requirements are part of the country’s latest Electronic Record Retention Law (ERRL) reform. Along with measures such as the Qualified Invoice System (QIS) and the possibility to issue and send invoices electronically via PEPPOL, Japan is implementing different indirect tax control measures, seeking to reduce tax evasion and promote digital transformation. […]