Greece’s Final B2B E-Invoicing Wave Goes Live on 1 October

Greece will extend mandatory electronic invoicing to remaining businesses from 1 October 2026, completing the second phase of its domestic rollout.

Businesses with gross revenue exceeding €1 million, based on their 2023 income tax return, have already been subject to the requirement since 2 March 2026. The October deadline brings all other businesses covered by the rules into scope.

The mandate applies to domestic B2B transactions, certain transactions with businesses outside the EU and business-to-government activity. Invoices must be issued through an authorised electronic invoicing provider or using the Greek tax authority’s free timologio or myDATAapp tools. Transaction data is then transmitted automatically to AADE’s myDATA platform.

AADE has provided a transition period from 1 October to 31 December 2026, during which affected businesses may gradually adopt electronic invoicing while continuing to use other permitted issuance and transmission methods. However, this is conditional. Businesses must submit the required declaration on time and state an electronic invoicing start date no later than 1 October 2026.

The second wave marks the final major stage in Greece’s move to mandatory electronic invoicing, extending real-time invoice transmission across the country’s business population.

Source: AADE

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