E-invoicing provider or ERP: which channel do you need

Every document a Greek business issues must reach AADE’s myDATA platform. Businesses that invoice with software have two main options:

• ERP channel: the invoicing software issues the document and sends its data straight to myDATA through AADE’s interface, using the business’s own access keys. myDATA replies with a MARK, a UID and a QR code.
• Certified e-invoicing provider: the software passes the document to a provider licensed by AADE. The provider applies an authentication code, sends it to myDATA, delivers it electronically to the recipient and stores it for as long as the law requires.

There are also AADE’s free timologio and myDATAapp applications and the special registration form. These are tools for issuing or recording documents, not business software: they do not connect to your customer list, stock or payments, so they mainly suit businesses that issue few documents.

The real difference is who vouches for the document. In the ERP channel, myDATA receives a summary, and the QR code only shows that the summary arrived; it is not a mark on the document. With a provider, the document itself carries a digital mark from a licensed third party and reaches the recipient in a structured electronic format.

That has consequences:

• Retail without a cash register: through a provider you can issue retail receipts without a fiscal electronic device (ΦΗΜ), because the provider does the marking.
• Public sector (B2G): invoices to public bodies under public contracts are sent through a provider, in the format the law sets.
• B2B invoices: under mandatory e-invoicing, an ERP on its own is no longer an accepted way to issue them, as explained below.

The ERP channel has the advantage of needing no third party, so there is no extra cost. A provider has an annual fee, but covers what an ERP cannot.

AADE is explicit: business and accounting software (ERP) is not, on its own, an accepted way to issue invoices for the transactions mandatory e-invoicing covers, namely domestic B2B, B2B with non-EU countries, and B2G.

The dates, after the 2026 postponements:

• Businesses with 2023 gross revenue above €1m: mandatory from 2 March 2026, with a transition until 3 May 2026.
• All other businesses: from 2 November 2026, with a transition until 31 January 2027. From 1 February 2027, invoices must be issued only through a provider or timologio / myDATAapp.

During the transition, using an ERP alongside e-invoicing is allowed, provided the e-invoicing start declaration was filed on time.

This does not mean invoicing software is “abolished”. It means that for B2B invoices it has to work with a provider. The software keeps customers, products, prices, stock and payments, and the provider issues the legally valid e-invoice.

Direct transmission (ERP) is still useful for documents mandatory e-invoicing does not cover, such as intra-EU transactions, and, until the end of your transition period, for B2B invoices. Retail documents follow the rules for fiscal devices or providers, so ask your accountant what applies to your line of business.

A provider is the right choice if:

• you invoice other businesses, which in practice means almost every business from 1 February 2027,
• you invoice public sector bodies,
• you want to issue retail receipts without a cash register.

AADE’s apps (timologio, myDATAapp) are enough for anyone issuing a few invoices a month who does not need stock, payments or reports.

For most small businesses the practical answer is both: software that sends directly to myDATA whatever is allowed, and routes through a provider whatever requires one.

You do not need to know AADE’s technical specifications to pick a channel. You only need to answer five questions about your own business:

• Who do you sell to? If even part of your sales are to businesses, you will need a provider or AADE’s apps for those invoices once the transition period ends.
• Do you invoice the public sector? If so, a provider is a prerequisite for the contracts the B2G obligation covers.
• Do you sell retail with a cash register? If you want to issue receipts without a fiscal device, you need a provider.
• How many documents do you issue? For a few invoices a month, timologio or myDATAapp may be enough. Past a certain point, entering everything twice, once in AADE’s app and once in your own records, costs more time than it is worth.
• What else do you need? Stock, payments, reminders, reports for your accountant? Those come from invoicing software, not from a provider on its own.

If the answer to the first question is “yes”, the choice has already been made for you: from 1 February 2027, B2B invoices go through a provider or AADE’s apps. The only question is whether you do it from the same software you use for everything else, or in a separate tool.

eFluper supports both channels from the same issuing screen:

• Direct transmission to myDATA (the ERP channel) on every plan, including the free one, with MARK, UID and QR code on every document.
• Connection to the certified provider Impact, as an add-on from €95 a year (excl. VAT), for B2B, B2G and retail (B2C) documents. On the Light plan, retail through the provider covers service receipts only.

You do not switch software, you do not move customers and products, and you need no cash register or special equipment. When your turn for mandatory e-invoicing comes, you switch on the provider and keep working as before.

And because eFluper also pulls from myDATA the documents your suppliers issue to you, the e-invoices you receive show up in the same place, and you can turn them into purchase documents without retyping.