Greece is modernising the way companies issue and report invoices with structured electronic invoices validated via the myDATA platform, now with extended deadlines.
The original go-live date of 2 February 2026 was moved to 2 March 2026, with a grace period extended until 3 May 2026. Each invoice receives a unique MARK number from myDATA.
Greece is modernising the way companies issue and report invoices. Under the reform, businesses must replace paper documents with structured electronic invoices that are validated and transmitted via the state's myDATA platform.
When the tax authority and the Ministry of Finance announced a delay in February, the original go-live date was moved and a grace period was extended. This gives companies more time to prepare their systems and to file the required declaration indicating whether they will use a certified e-invoicing provider or AADE's free tools.
The philosophy of the reform is that each invoice receives a unique MARK number from myDATA and that transaction data is automatically delivered to the tax office.
Decision A.1044/2026 splits the rollout into two waves:
Applies to companies whose 2023 turnover exceeded €1 million. During the transitional period from 2 March to 3 May 2026, these businesses may continue using paper or their existing invoice systems, provided they have filed the "Declaration of Electronic Issuing" or the "Declaration of Timologio Use".
Extends the obligation to all other taxpayers, with a soft-landing period through 31 December 2026. Covers domestic B2B, exports outside the EU, and B2G transactions. Intra-EU B2B transactions remain optional.
Important: From 2 March 2026 onward, recipients must be able to accept electronic invoices, except for certain state contracts and everyday expenses.
Businesses have several ways to comply:
Offer paid services to generate and transmit e-invoices, validate the XML structure, provide archiving, and integrate directly with ERP systems. This is the preferred option for large and multinational companies.
AADE's free solutions cater to freelancers and micro-enterprises:
Must either work through a certified provider or agree with their Greek counterpart on how the invoice will be exchanged. Non-resident suppliers should ensure their invoice carries a valid MARK identifier and uses a compatible XML format.
Invoices transmitted outside approved channels will not be considered legally issued.
| Violation | Penalty |
|---|---|
| Failing to issue e-invoice | Up to 50% of VAT due |
| Non-VAT transactions (simplified accounting) | €500 |
| Non-VAT transactions (double-entry bookkeeping) | €1,000 |
Missing the deadline can halt business processes, prevent input VAT claims, and force manual processing.
Generates structured e-invoices compatible with Greek requirements
Validates XML files before submission
Integrates with certified providers and myDATA
Tracks delivery status and stores documents for legal retention
Single platform for Germany, France, Greece and more
Note: Read more about required fields for invoices to Greece here — Required Fields in the Greek B2G e-Invoice (Peppol Greek CIUS)
EDEKA e-invoicing: mandatory fields beyond EN 16931
/in eInvoice NewsAn invoice can pass validation against the European standard and still be rejected by the buyer. The EDEKA supplier guide of 15 October 2026 shows where the gap sits. The short version is here, the full requirements on the EDEKA page.
Four mandates starting on 1 January 2027
/in eInvoice NewsGermany, Poland, Slovakia and Norway change their invoicing rules on 1 January 2027. Spain has stepped out of that date. The calendar, the thresholds and what to do in the fourth quarter.
Spanish e-invoicing mandate: deadlines from 6 October 2026
/in eInvoice NewsOrden HAC/1028/2026 regulates the state platform SPFE and started the countdown. This article sets out the timetable, the reporting of invoice and payment statuses and the requirements placed on private exchange platforms.
Germany’s 2026 E-Invoicing Update: What the New BMF Letter Changes
/in eInvoice NewsThe BMF letter of 15 October 2026 says a business-rule error is still an e-invoice for VAT, writes the Kontrollfunktion into the UStAE, and extends two concessions to June 2030.
Luxembourg Plans Mandatory B2B E-Invoicing from 2028 — via Peppol
/in eInvoice NewsLuxembourg has proposed a phased B2B e-invoicing mandate starting in 2028. Bill 8815 would require businesses to receive and issue structured e-invoices through a common Peppol-based delivery network.
Greece Postpones Phase B of B2B E-Invoicing but 1 February 2027 Is the Date to Watch
/in eInvoice NewsGreece has moved Phase B of its B2B e-invoicing mandate to 2 November 2026. But the more important deadline comes on 1 February 2027, when direct ERP-to-myDATA transmission will no longer be permitted. Here is what businesses need to prepare for.