As of June 2026: Greece has two distinct obligations. myDATA — transmitting invoice and accounting data to AADE — has been mandatory since 2021. Separately, a NEW structured B2B e-invoicing mandate (authorised by Council Implementing Decision (EU) 2025/502) is rolling out in 2026: Phase 1 from 2 March 2026 for large companies (over €1 million 2023 revenue), and Phase 2 from 1 October 2026 for everyone else, with graduated enforcement periods. E-invoices must be EN 16931-compliant and pass through myDATA for a unique identifier. Confirm dates and your phase with AADE (Independent Authority for Public Revenue).
Greece operates myDATA (my Digital Accounting and Tax Application), run by AADE, which has required businesses to transmit invoice and accounting data since 2021 — that is e-reporting, not full structured e-invoicing on its own. On top of that, Greece secured an EU derogation (Council Implementing Decision (EU) 2025/502) to introduce a mandatory structured B2B e-invoicing regime in 2026: Phase 1 from 2 March 2026 for large companies and Phase 2 from 1 October 2026 for all remaining businesses, each with a graduated transition window. The new B2B e-invoices must follow the EN 16931 European standard and be cleared through myDATA. We keep these two layers — reporting and the structured mandate — clearly separate.
Greece's new B2B mandate requires EN 16931-compliant structured invoices, and that is precisely what Invotify's Pro e-invoicing exports — UBL 2.1, CII and Peppol BIS 3.0, all built on EN 16931. That gives you a standards-based file ready to feed into a myDATA-connected provider or access point as the 2026 phases take effect, rather than scrambling to restructure PDFs at the deadline. Invotify provides standards-based export only; the myDATA transmission, unique-identifier (UID) assignment and clearance are completed by your myDATA channel or accountant. E-invoice export is a paid Pro feature.
It is becoming mandatory in 2026. Under Council Implementing Decision (EU) 2025/502, Phase 1 starts 2 March 2026 for large companies (over €1 million 2023 revenue) and Phase 2 from 1 October 2026 for all other businesses, each with a graduated enforcement window. Confirm your phase and exact dates with AADE before relying on them.
myDATA, mandatory since 2021, is e-reporting — businesses transmit invoice and accounting data to AADE. The 2026 mandate is a separate, stronger obligation: issuing structured EN 16931 e-invoices that pass through myDATA to receive a unique identifier. One is reporting data about invoices; the other is the structured invoice itself. We keep them clearly distinct.
Greek B2B and B2G e-invoices must be structured and compliant with the EN 16931 European standard. Invotify Pro exports EN 16931-based UBL 2.1, CII and Peppol BIS 3.0, giving you a compatible structured file. We emit open standards rather than a Greece-only proprietary format, so the output stays interoperable with myDATA-connected providers and Peppol.
No. Invotify provides standards-based structured export — UBL 2.1, CII and Peppol BIS 3.0 — not a direct myDATA integration. The transmission to myDATA, the unique-identifier (UID) assignment and clearance are handled by your myDATA-connected provider, access point or accountant. This keeps your invoice data portable across tools.
AADE, the Independent Authority for Public Revenue, operates myDATA and oversees both the existing reporting regime and the new 2026 B2B e-invoicing mandate. AADE is the authoritative source for phase dates, thresholds and technical specifications — always confirm the current rules with them.
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