Compliance · 🇬🇷 Greece Live mandate

Greece — myDATA real-time reporting & Peppol BIS

myDATA real-time reporting universal · Peppol BIS for cross-border — regulator: Ανεξάρτητη Αρχή Δημοσίων Εσόδων (AADE). Facts last refreshed: 2026-05-05.

Coverage model

Flowie operates a registered Peppol Access Point in this jurisdiction directly where we hold national accreditation, or via a vetted local partner registered with the in-country regulator where on-the-ground presence is required (KSeF, SDI intermediario, ZATCA service-provider, etc.). Either way, you call the same POST /v1/documents/send.

TL;DR

Greece runs myDATA — every taxpayer transmits invoice headers in near-real-time to the AADE platform.
Mandatory since 2021 for all Greek VAT-registered businesses; no size threshold.
B2B e-invoicing (vs. just e-reporting) is voluntary today but offered via accredited providers; uptake accelerating ahead of an expected mandate.
Cross-border: Peppol BIS 3.0; Flowie operates as an accredited Greek e-invoicing provider directly, or via a specialized local partner where AADE accreditation is held in-country.

Deadlines

Date	Who	What
2021-10-01	All Greek VAT-registered businesses	myDATA real-time reporting mandatory.
2024-04-01	Public-sector contracting	B2G via Peppol BIS for state suppliers.
≥ 2026	Universal B2B e-invoicing (expected)	AADE consultation underway; would convert myDATA reporting into full e-invoicing.

Background

myDATA (My Digital Accounting & Tax Application) is structurally a continuous transaction control (CTC) regime: each invoice issued generates an HTTP call to AADE that returns a MARK (unique mark) and a UID. The seller stamps these onto the invoice; the buyer can verify with AADE.

Flowie sends through myDATA on every Greek-issued invoice — the response includes complianceReceipt.mark and complianceReceipt.uid. Cross-border invoices to non-Greek buyers ride Peppol BIS as usual.

Format profile

myDATA invoice schema (XML, AADE-defined) for the e-reporting payload.
Peppol BIS 3.0 for cross-border B2B.
Greek VAT: EL + 9 digits (yes, EL, not GR, per ISO 3166 vs. EU VAT custom).

Required fields

seller.vatNumberstringrequired

Format EL123456789.
myData.invoiceTypecoderequired for myDATA

Three-digit AADE invoice-type code (e.g. 1.1 = Sales Invoice). Flowie maps from type automatically when omitted.

Public sector (B2G)

Hub	Peppol identifier scheme	Lookup
AADE Peppol gateway	`9933:GR-<afm>`	https://www.aade.gr/peppol

Greek public buyers identified by their AFM (tax ID) over the Peppol GR scheme.

B2B reporting / clearance

myDATA (AADE) — Real-time transmission of invoice headers + MARK/UID issuance.

Lifecycle status	Reported as
`issued`	MARK + UID issued by AADE.
`cancelled`	Cancellation message; original MARK referenced.

Error codes

Code	Meaning	Fix
`myDATA-104`	Buyer AFM unknown.	Verify the buyer's AFM with AADE; new registrations propagate within 24h.
`myDATA-201`	Invoice type code mismatch with line categories.	Flowie usually sets this; if you override, ensure it matches the AADE matrix.

Testing in sandbox

What you want to test	How
Greek domestic happy path	Seller AFM `EL000000001`, buyer AFM `EL000000002` in sandbox; MARK `SBX-...` echoed.
Force myDATA rejection	`simulateCompliance: "reject_myDATA_104"`.

FAQ

Do I still need to file VAT returns if myDATA is real-time?

Yes for now — the periodic VAT return remains, but it's pre-filled by AADE from myDATA data. Direction of travel is to drop the return entirely.

References

Primary sources (government / regulator / standards body):

EU Commission · eInvoicing in Greece — Pan-EU reference factsheet.
OpenPeppol · Greece profile — Authoritative Peppol facts.
AADE · myDATA platform — Tax authority myDATA real-time reporting.
AADE · e-invoicing service providers — Licensed e-invoicing providers list.

Industry analyses (vendor trackers — useful for cross-referencing):

EDICOM · Greece myDATA mandate — Industry tracker — 2026 phased B2B rollout.