myDATA — Greece e-invoicing

Invoicerr does not support Greece

No Greece data file exists anywhere in this repository — no country policy, no identifiers, no tax system, no transmission channel. Nothing on this page is implemented. It is here so that someone who wants Greece support knows what adding it would involve. The countries Invoicerr does cover are listed in the country directory.

Greece reports invoice data through myDATA (My Digital Accounting and Tax Application), run by AADE (Independent Authority for Public Revenue). Every invoice is currently reported to myDATA after issuance; from 2026 myDATA is expected to become a clearance step, returning a MARK registration number before the invoice is valid.

What supporting Greece would involve

System	myDATA — AADE's Digital Accounting and Tax Application
Authority	AADE (Independent Authority for Public Revenue)
Format	A national XML schema submitted to myDATA. No provider in backend/src/modules/documents/formats/ builds it today.
Transmission	Submission to the myDATA API (AADE). No transport in backend/src/modules/documents/transports/ talks to it today.

Inherited, unverified

Carried over from an earlier research pass in this repository's own history, and never checked against a primary source. Leads, not facts — confirm every line before writing it into a data file.

• Today's model is post-issuance reporting: every company reports invoice summaries to myDATA after the invoice is issued.
• Mandatory e-invoicing (a clearance step, returning a MARK before the invoice is valid) is due to phase in through 2026, starting with large enterprises.
• Invoices can be submitted either directly to AADE's API or through a certified provider that also offers Peppol connectivity for B2G.

Which catalogues a contributor would add

Adding a country is data, not code. Adding a country is the procedure and the contract each file has to satisfy; this is only the shopping list for Greece.

• country-policy/data/gr.json — which document actions Greece allows. Start here: without this file every action is refused with a 403, naming the country.
• country-identifiers/data/gr.json — which national identifier a party must carry.
• tax/tax-systems/data/gr.json and vat-rates/data/gr.json — the tax kind, and the rate ladder offered on an invoice line.
• correction-routes/data/gr.json — all eleven canonical correction routes, unverified where unresearched, never omitted.
• b2g-routing/data/gr.json — the channel and format a Greek public buyer requires.
• transports/channel-policy/data/gr.json — whether a channel is legally required of a seller established in Greece, and from what date.
• archive/retention/data/gr.json — how long an archived document is kept, and what the duration is counted from.

Add mentions/, content-requirements/, country-fields/, reporting/ and domestic-reverse-charge/ only where the law actually gives them content.

Data alone will not finish the job here: the myDATA platform is a transmission channel this repository does not implement, and its XML schema has no format provider. Both are code, not a JSON file — see When a country needs more than a file.

Want Greece supported?

Check the open compliance issues first. If there is no issue for Greece, open one and name which of the files above you need — a request that names one mechanism is far more actionable than "please add Greece".