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Guide · Greek e-invoicing

AADE timologio: issuing e-invoices with Greece's free app

Updated · Rotomal

timologio (also searched as timologio aade, e timologio, e-timologio or myaade timologio) is AADE's free web application, with no usage limit, for issuing invoices and transmitting them to myDATA at the same time; you log in at https://mydata.aade.gr/timologio/, and myDATAapp is its free companion for phones and tablets. For Greek businesses with 2023 gross revenue up to €1 million, e-invoicing is mandatory from 2 November 2026, with a gradual period to 31 January 2027; from 1 February 2027 invoices are issued only through a certified provider or timologio and myDATAapp. A business issuing only through timologio or myDATAapp from 2 November 2026, without the gradual period, files no declaration.

Where to log in to timologio

The official login page is https://mydata.aade.gr/timologio/. It asks for a username, the business's Greek VAT number (ΑΦΜ) and a Subscription Key, or offers «Είσοδος με Φιλικούς Κωδικούς» (log in with friendly codes: username and password).

If you have no Subscription Key, the page's link «Δημιουργία / Ανάκτηση Subscription Key» (create or recover the key) takes you to get or recover it with the business's TAXISnet credentials. How to create friendly codes (φιλικοί κωδικοί) in myDATAusers, how to find your Subscription Key and common problems are in the timologio login (e timologio eisodos) guide.

Who must e-invoice, and from when

The rules are set by decision A.1128/2025 as amended by A.1044/2026 (first period) and A.1197/2026 of 30 September 2026 (second period). They cover invoices between businesses in Greece (B2B), to businesses in non-EU countries and to the Greek public sector (B2G). Retail sales to consumers and intra-EU transactions are out of scope.

GroupMandatory fromGradual period
2023 gross revenue above €1 million (first period)2 March 2026Ended on 3 May 2026
2023 gross revenue up to €1 million (second period)2 November 20262 Nov 2026 to 31 Jan 2027, only with a timely declaration. From 1 Feb 2027 only a provider or timologio/myDATAapp

Do you need a myAADE declaration?

  • Only timologio or myDATAapp from 2 November 2026, without the gradual period: no declaration.
  • Keeping your old method (for example your ERP) alongside until 31 January 2027: a timely declaration with a start date no later than 2 November 2026 (for timologio, the use declaration).
  • Through a certified provider: a start-of-use declaration (Δήλωση Έναρξης Ηλεκτρονικής Έκδοσης Στοιχείων) with a start date of 2 November 2026.
  • Deadline: the decision says «timely» without a date. Taxheaven's analysis puts it at 10 days from the start date, so 12 November 2026 for a 2 November start. If a provider does not file its declaration by 12 November 2026, the business files it; Taxheaven's November calendar gives 23 November 2026.

timologio, myDATAapp or a provider

OptionRuns onCostUsually fits
timologioWeb browserFree (AADE), no usage limitFreelancers and small businesses issuing invoices by hand
myDATAappPhone or tabletFree (AADE)Issuing on the go; needs a timologio account first
Certified providerYour invoicing software or ERPPaid, e.g. Epsilon Smart Invoice Start €4/month billed yearly, excl. VATHigher volumes, or software that must send invoices automatically

Getting started with timologio and myDATAapp

  • Log in at https://mydata.aade.gr/timologio/ with username, ΑΦΜ and Subscription Key, or with friendly codes.
  • Set up the business profile, your customer list and your goods or services; define document categories and invoice series.
  • For myDATAapp, create friendly credentials (username and password) in myDATAusers with TAXISnet credentials; authorised users first accept the authorisation there.
  • Issue a first invoice. The app sends the summary to the issuer's myDATA (income) and the recipient's (expenses); check it appears before you rely on it.

What happens if you don't issue e-invoices

An invoice not issued through a provider or timologio/myDATAapp counts as not issued, unless the connection was lost (power or internet). For VAT-able transactions the fine is 50% of the VAT, with a minimum of €250 for single-entry and €500 for double-entry books, rising to 100% and 200% for repeat offences. Details are in the penalties guide.

When you want it set up with you

timologio is free and you can set it up yourself with the steps above. If you'd rather do it in one call, in English or Greek, Τιμολόγια σε Τάξη guides you through the login, profile, series and a test invoice, from €29 one-time. You log in yourself; we never ask for TAXISnet credentials.

Questions

Is AADE timologio free?

Yes. timologio and myDATAapp are free AADE applications, and timologio has no usage limit. A certified e-invoicing provider is the paid alternative.

What is the difference between timologio and myDATAapp?

timologio is the web application. myDATAapp issues invoices from a phone or tablet, and needs a timologio account and myDATAusers credentials first.

Do I need to file a declaration to use timologio?

Not if you issue only through timologio or myDATAapp from 2 November 2026. You need one only for the gradual period to 31 January 2027, that is, to keep issuing the old way alongside.

Can I keep sending invoices from my ERP?

Only during the gradual period (2 November 2026 to 31 January 2027) and only with a timely declaration. From 1 February 2027 direct transmission from an ERP stops; the ERP can carry on if it connects to a provider.

Is this guide tax advice?

No. It summarises AADE's announcements for information. Confirm your own case with your Greek accountant or AADE's 1521 service.

Is «e timologio» the same as AADE timologio?

Many people type «e timologio» or «ετιμολόγιο» and mean AADE's free timologio app at https://mydata.aade.gr/timologio/. There is also a paid invoicing program called eTimologio (etimologio.gr), made by the company Timologic, which is not AADE's. If the address is not mydata.aade.gr/timologio, you are not in AADE's app.

Sources

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