E-Invoicing in Greece

PlannedPeppol

Greece is implementing mandatory B2B e-invoicing from February 2026 in phases — large businesses (>€1M revenue) first, then all businesses from October 2026. The myDATA platform serves as the clearance system, validating invoices and assigning unique MARK/UID identifiers. B2G delivery occurs via Peppol to the KED (National Interoperability Center).

Mandate Status

Phase	Status	Scope
myDATA reporting	Live (Jul 2021)	All businesses (mandatory)
B2G	Live (Sep 2025)	All public contracts
B2B Phase A	Live (Feb 2026)	Large businesses (>€1M revenue in 2023)
B2B Phase B	Oct 2026	All remaining businesses

Technical Specifications

Validation enginemyDATA (clearance platform with MARK/UID assignment)

Required CIUSEN 16931 compliant myDATA XML

Government portalmyDATA (aade.gr/mydata)

PeppolYes — Peppol used for B2G delivery to KED

Accepted formatsmyDATA XML, EN 16931, Peppol BIS 3.0 (for B2G delivery)

Implementation Notes

myDATA clearance workflow. Invoices are submitted to myDATA for validation, receive a unique MARK/UID, then are delivered via certified providers or the free Timologio app. QR codes on PDFs must link to the myDATA record. Tax incentives are available for companies adopting e-invoicing 2 months before the deadline: 100% equipment depreciation in purchase year and 100% deduction on e-invoice costs for the first 12 months.

Common Rejection Patterns

#	Code	Description
1	`GR-R-002`	myDATA reporting required	Fix guide
2	`GR-R-004`	Greek VAT category code required	Fix guide
3	`GR-R-003`	Greek invoice type code required	Fix guide
4	`GR-R-004-1`	When Supplier is Greek, there must be one MARK Number	Fix guide
5	`GR-R-001`	Greek AFM (VAT number) required	Fix guide

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