myDATA is the digital bookkeeping and reporting platform of the Greek tax authority AADE. B2B e-invoices are transmitted to myDATA and receive a unique identifier (UID) there before they count as valid.

Country guide · Updated June 2026

E-invoicing in Greece: myDATA, B2B mandate

Q: When does B2B e-invoicing become mandatory in Greece?

Phase 1 starts on 2 March 2026 for companies with gross turnover above 1 million euro in fiscal year 2023. Phase 2 follows on 1 October 2026 for the remaining companies, with an adjustment period until 31 December 2026.

Greece is making B2B e-invoicing mandatory, through its myDATA platform. Phase 1 starts on 2 March 2026 for companies with turnover above 1 million euro, phase 2 on 1 October 2026 for the rest. The key point: the invoice has to be transmitted to myDATA and gets a unique identifier there before it counts.

TL;DR

B2B mandate through myDATA: phase 1 from 2.3.2026 (gross turnover above 1 million euro, FY 2023), phase 2 from 1.10.2026 with an adjustment period until 31.12.2026. Basis: EU Council Decision 2025/502, time-limited to 31.12.2027. The model is based on Peppol and EN 16931, delivery runs through myDATA. Vera produces the EN 16931 file; transmission to myDATA is separate.

When does e-invoicing become mandatory in Greece?

The mandate is staggered by turnover. The basis is EU Council Decision 2025/502 of 5 March 2025, which allows Greece to require structured B2B e-invoicing, time-limited from 1 July 2025 until 31 December 2027.

Date	Obligation	Who
2 Mar 2026	B2B e-invoicing (phase 1)	Gross turnover above 1 million euro (FY 2023)
1 Oct 2026	B2B e-invoicing (phase 2)	remaining companies, adjustment until 31.12.2026

myDATA and the transmission route

myDATA is the digital bookkeeping and reporting platform of the tax authority AADE. The model is based on Peppol and EN 16931, but for B2B, Peppol is not the mandatory transmission route. Instead the invoice is sent to myDATA and gets a unique identifier (UID) there before it counts as valid.

How Vera helps for Greece

Note: Vera produces the EN 16931 invoice with a Greek AFM and validates before download. Transmission to myDATA and the assignment of the unique identifier are not part of Vera, that runs through the AADE platform.

For the EU standard and cross-border B2B invoices to EN 16931, Vera is directly usable. The Greek domestic route through myDATA is covered by a solution connected to myDATA.

FAQ

When does B2B e-invoicing become mandatory in Greece?

Phase 1 from 2.3.2026 for gross turnover above 1 million euro (FY 2023), phase 2 from 1.10.2026 for the rest with an adjustment period until 31.12.2026.

What is myDATA?

The digital bookkeeping and reporting platform of AADE. B2B e-invoices are transmitted there and receive a unique identifier before they are valid.

Which format and transmission route apply?

The model is based on Peppol and EN 16931. For B2B, Peppol is not the mandatory route, the invoice goes to myDATA for the unique identifier.

What is the legal basis for the mandate?

EU Council Decision 2025/502 of 5.3.2025, time-limited from 1.7.2025 until 31.12.2027.

Does Vera transmit the invoice to myDATA?

No. Vera produces the EN 16931 invoice with a Greek AFM and validates it. Transmission to myDATA is a separate step.

EN 16931 invoices for Greece

Vera produces the EN 16931 file with a Greek AFM in the browser, validated before download. Transmission to myDATA is handled afterwards through a connected solution.

Create one now

Free for 5 invoices / month · Pro 29 € / month · 27 EU countries