The final phase of mandatory e-invoicing implementation kicks off on October 1, 2026, as the measure now extends to small businesses with an annual turnover of up to €1 million. Greece’s Independent Authority for Public Revenue (IAPR) is completing the digital transformation of the market, dramatically curbing illegal transactions and fraudulent invoices. The new framework serves as a powerful tool against tax evasion while reinforcing transparency across business operations.
Scope of the e-invoicing mandate
From the measure’s activation date, every invoice must be issued exclusively in digital format — either through certified electronic document issuance providers or via the free platforms “timologio” and “myDATAapp” offered by the IAPR. To help businesses adapt smoothly, a three-month transitional period has been established, running through December 31, 2026.
The e-invoicing obligation covers all business-to-business (B2B) transactions conducted within Greek territory, including the sale of goods and the provision of services to companies based in third countries outside the European Union.
However, for transactions with businesses located in EU member states, the use of electronic invoicing remains optional for the time being. In cases where a foreign partner is unable or unwilling to receive a digital document, there is an option to send it via alternative methods, in accordance with current procedures.
Activation process for businesses
Businesses subject to the obligation must follow a specific preparation process. First, they select their document transmission channel — either through a modern ERP invoicing system and a certified provider, or through the IAPR’s free applications, timologio and myDATAapp.
Next, an official declaration of the chosen transmission channel is required, specifying whether a certified Electronic Document Issuance Service Provider or the “timologio” application will be used. It is worth noting that selecting the “timologio” application automatically includes access to the myDATAapp as well. Finally, documents are issued digitally and automatically transmitted to the myDATA platform, where they receive the mandatory Unique Registration Number (MARK), which validates their legal status.
Tax incentives and financial benefits
Businesses that voluntarily adopt e-invoicing ahead of the mandatory deadline can take advantage of significant financial incentives. Specifically, expenditure on the initial acquisition of the hardware and software required to implement e-invoicing is fully depreciated, with a 100% uplift applied.
In addition, costs related to the production, transmission, and digital archiving of electronic invoices during the first twelve months of operation are recognized as deductible from gross business income, with a 100% uplift in the year the expense is incurred.
To benefit from these incentives, businesses must have submitted a declaration of e-invoicing use — through either a certified provider or the IAPR’s application — no later than two months before the obligation takes effect (by August 3, 2026), and actual use must begin within the same timeframe.
Penalties and fines for non-compliance
Failure to issue an electronic invoice is treated under tax legislation as the non-issuance of a document, with penalties reaching up to €2,500 per violation, depending on the accounting system used and the type of transaction.
For VAT-liable transactions, a fine equal to 50% of the tax that would have arisen from the unissued document is imposed. The minimum total fine per tax audit is set at €250 for businesses using single-entry bookkeeping and €500 for those using double-entry bookkeeping.
For transactions not subject to VAT, the fine amounts to €500 per tax audit for single-entry businesses and €1,000 for double-entry businesses. Additionally, the omission or inaccurate submission of data to the system carries a separate fine of €2,500.
