{"id":27013,"date":"2026-10-15T09:00:00","date_gmt":"2026-10-15T06:00:00","guid":{"rendered":"https:\/\/weblab.gr\/?p=27004"},"modified":"2026-10-14T20:59:12","modified_gmt":"2026-10-14T17:59:12","slug":"e-invoicing-eshop","status":"publish","type":"post","link":"https:\/\/weblab.gr\/en\/ilektroniki-timologisi-eshop\/","title":{"rendered":"E-invoicing and your e-shop: what changes and what doesn\u2019t"},"content":{"rendered":"

From 2 November 2026, e-invoicing is mandatory for smaller businesses too, and therefore for every e-shop that issues even a few invoices to businesses. For an online store, the change doesn\u2019t stay in the accounts department: it affects the checkout, the order emails and the connection between WooCommerce and your provider or ERP.<\/p>\n

Below you\u2019ll find what applies today, with the new dates announced on 30 September, what doesn\u2019t change for retail sales, and a checklist for WooCommerce. This isn\u2019t tax advice. Every business has its own particularities, so confirm the steps with your accountant.<\/p>\n

E-invoicing: who and from when<\/h2>\n

The obligation covers invoices to businesses in Greece (B2B), to businesses in non-EU countries and to the public sector (B2G). It applies in two periods, based on the gross revenue declared for tax year 2023.<\/p>\n\n\n\n\n\n\n
Period<\/th>\nWho it applies to<\/th>\nMandatory from<\/th>\nPhase-in until<\/th>\n<\/tr>\n<\/thead>\n
First<\/td>\nRevenue over \u20ac1,000,000<\/td>\n2\/3\/2026<\/td>\n3\/5\/2026<\/td>\n<\/tr>\n
Second<\/td>\nRevenue up to \u20ac1,000,000<\/td>\n2\/11\/2026<\/td>\n31\/1\/2027<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Most small e-shops fall into the second period. The original date was 1 October 2026, but joint decision A.1197\/2026<\/a> moved it to 2 November, as the Ministry of National Economy and Finance and AADE announced on 30 September 2026<\/a>. Many texts online still give the old date.<\/p>\n

Until 31 January 2027 you can also keep issuing in parallel the way you already do, i.e. with commercial software, an ERP or the special form, provided you submitted the relevant declaration in time. From 1 February 2027, these invoices are issued and transmitted to myDATA only through an e-invoicing provider or the timologio and myDATAapp applications. Transmission from an ERP will no longer be accepted for these documents.<\/p>\n

According to AADE, about 655,000 second-period businesses, almost 70%, were already using a provider or its apps at the end of September. For those who fall behind, the consequences aren\u2019t theoretical. As AADE has clarified<\/a>, if an e-invoice isn\u2019t issued where one is required, the invoice is considered not to have been issued. The fine is 50% of the corresponding VAT or, for transactions without VAT, \u20ac500 or \u20ac1,000 per audit, depending on the books you keep.<\/p>\n

A provider or the free timologio app?<\/h2>\n

\"Colleagues
\nAADE leaves two routes. The first is an E-Invoicing Provider: a private company whose software has received a certificate of suitability. AADE publishes the list of licensed software<\/a>, which also shows which ones cover public contracts or also work as a cash register system and POS. Providers usually charge a subscription, which varies with volume and services.<\/p>\n

The second is AADE\u2019s free apps: timologio for desktop and myDATAapp for mobile, which also cover invoices to the public sector. If from 2 November 2026 you issue only through them and don\u2019t want the phase-in period, you don\u2019t need a \u201cDeclaration of Start of Electronic Issuance of Documents\u201d. If you use a provider, the declaration is required, with a start date of 2 November 2026.<\/p>\n

For an e-shop, the choice comes down to volume. In timologio you enter each invoice separately, so it suits a store that issues few invoices a month. If there are dozens, or if you want them issued automatically with the order, you need a provider with a ready-made connection (plugin or API) for WooCommerce, or an ERP that works with a provider.<\/p>\n

myDATA, classifications and MARK in plain language<\/h2>\n

myDATA is AADE\u2019s electronic books platform<\/a>. It\u2019s where the summary of every document you issue ends up, wholesale or retail, to businesses or individuals. When the customer is a business, their own books are updated automatically too. The data arrives from commercial software or an ERP, from the special form, from an electronic fiscal device (FIM) for retail, or from a provider.<\/p>\n

With every successful transmission, AADE assigns a Unique Registration Number (MARK)<\/strong>, the confirmation that the document has been registered. The classification<\/strong> is how the transaction is categorized, e.g. sale of goods or provision of services. For income it can be sent with the document or later; for expenses it\u2019s always done afterwards.<\/p>\n

This is exactly where you need your accountant. The e-shop must send the right document type, VAT category and classification for every product or service. These are set once and checked before automatic issuing starts, because a mistake in the setup is repeated in every order.<\/p>\n

Retail in your e-shop: what doesn\u2019t change<\/h2>\n

Most of an e-shop\u2019s orders come from individuals. For these, AADE is clear: mandatory e-invoicing brings no change<\/a> to the obligations and the way retail documents are issued. The receipt is issued as it is today and its summary is transmitted to myDATA.<\/p>\n

\u201cAs it is today\u201d isn\u2019t the same for everyone. In some e-shops the receipt comes from commercial software connected to an FIM, in others from a provider that also works as a cash register system. Which way suits your business is for your accountant to decide, not the plugin.<\/p>\n

A point that often causes confusion: the mandatory connection of POS terminals to cash register systems applies to physical terminals. AADE decision A.1074\/2024<\/a> states that distance sales (e-commerce and marketplaces) are not covered by it. If, however, you also have a physical store with a POS, the connection rules apply there, and it\u2019s a good idea to go over them with your cash register technician.<\/p>\n

What a WooCommerce e-shop needs technically<\/h2>\n

\"Hands
\nWooCommerce doesn\u2019t issue legal tax documents on its own. It needs a connection to a provider or ERP and a few changes to the checkout. These are the things we most often see missing:<\/p>\n