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Mandatory e-invoicing in Greece
Greece has implemented an electronic reporting and e-invoicing system as part of the myDATA (My Digital Accounting and Tax Application) project, managed by AADE (Independent Authority for Public Revenue).
The system is used to electronically transmit accounting and invoicing data in real time to the Greek tax administration.
Currently, e-invoicing in B2G transactions is mandatory, while the use of e-invoicing in the B2B sector is voluntary, but is becoming more widely used - especially by companies that want to automate processes and ensure full compliance with myDATA requirements.
According to plans by Greece's Ministry of Finance, the myDATA system will be expanded in the coming years to include mandatory B2B e-invoicing in order to bring the legislation in line with the EU 's "VAT in the Digital Age" (ViDA) package.
E-invoicing standards in Greece
Greece's e-invoicing system is based on the central myDATA platform, which enables the electronic transfer of invoice data and its automatic processing and verification by AADE.
The main components of the system are:
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myDATA (My Digital Accounting and Tax Application) - the tax administration's central platform for reporting and archiving invoice data,
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AADE - the Greek tax administration responsible for data validation and VAT compliance,
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Certified e-invoicing providers (Service Providers) - private entities authorized by AADE to issue and send e-invoices on behalf of businesses,
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XML format in accordance with EN 16931 - the data structure standard used in the Greek system, enabling automated processing,
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Peppol - an optional e-invoice exchange network used for international B2B transactions, supported by many Greek service providers.
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Reduction in operating costs by up to 25%
Automating processes and eliminating the need for local solutions significantly reduces operating expenses.
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Reduce deployment time by 40%
Off-the-shelf integrations and a proven implementation process allow the platform to be up and running quickly without lengthy IT projects.
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Elimination of human error up to 90%
Automatic data processing reduces the risk of mistakes and speeds up workflow.
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Full compliance with PEPPOL, KSeF, ZATCA, ANAF and other systems
The platform automatically adapts to local regulations in each country, ensuring business continuity.
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Readiness for expansion and regulatory changes
A single, scalable platform means full flexibility to expand into new markets without technical barriers.
You send invoices and documents to administrations and business partners in Europe directly through PEPPOL, without additional integrations.
Compliance with EU security and interoperability standards (including eIDAS and RODO).
Fewerexceptions, more automation - all PEPPOL countries (e.g. Germany, France, Scandinavia, Benelux) "understand" the documents sent via this route
Peace of mind for CFOs and accounting - because documents are sent through a trusted, controlled channel that complies with EU regulations.
Ready for KSeF? We Are.
Don't let compliance slow you down. Let us handle the complexities of KSeF while you focus on growth.
Frequently Asked Questions (FAQ)
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Will foreign entities registered for VAT in Poland also be required to issue e-invoices?
Yes. The enacted law does not impose any entity-based restrictions regarding the ability to issue e-invoices. At this time, there is no indication that the obligation to use structured invoices, which has been in place since 2023, will not apply universally.
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Will all sales invoices need to be issued as e-invoices, or only those for domestic contractors?
Yes. The enacted law does not impose any restrictions in this regard.
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Will it be possible to send invoices (individually or in bulk) without using the API, via an interface accessible to employees?
So far, the Ministry of Finance has only published documentation on how to communicate with the National e-Invoicing System (KSeF) using an API. This means that taxpayers must have their own software capable of utilizing this API. However, there are plans to launch a KSeF platform for issuing, reviewing, and retrieving invoices, as well as an update to the e-Mikrofirma tool, which will allow users to manually generate e-invoices.
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Will an invoice issuer be able to download an invoice image from KSeF to print or send it to a contractor via email?
If the recipient has not fully accepted receiving invoices via KSeF, the invoice must be sent through an alternative agreed method, such as email. In this case, it will likely be necessary to send the invoice directly from the issuer's system.
At this stage, there are no detailed technical specifications on how invoice retrieval from KSeF will work. -
How will attachments to invoices, such as energy consumption reports or protocols, be delivered to contractors?
The current structured invoice format does not allow attachments to be included with e-invoices. As a result, any necessary attachments will need to be sent outside the system, based on arrangements with individual contractors.
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Can the invoice storage period be extended, and if not, how should invoices be stored after 10 years?
No. Structured invoices will be stored in the National e-Invoicing System (KSeF) for 10 years. If legal regulations require a taxpayer to keep invoices beyond this period, they will need to ensure their storage independently.
Additionally, it will remain necessary to guarantee the authenticity of origin, integrity of content, and readability of the invoices.
Expert opinion
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Frequently Asked Questions (FAQs)
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From when will e-invoicing be mandatory in Greece?
Mandatory e-invoicing is already operational in the B2G sector. Mandatory B2B e-invoicing is to be introduced in the next phases of myDATA's development, in line with plans to align with the ViDA package (2026+).
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What e-invoice formats are in effect in Greece?
Greece uses a structured XML format in accordance with EN 16931, used by both the myDATA platform and certified e-invoicing providers.
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What is myDATA and do I need to use it?
myDATA is AADE's central platform for reporting accounting and invoicing data. Any company doing business in Greece must report its data to myDATA - B2B e-invoicing will become a mandatory part of it.
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How does e-invoicing by certified suppliers work in Greece?
Companies can issue and transmit e-invoices to myDATA using certified providers who are responsible for validating, reporting and archiving documents in accordance with AADE requirements.
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How to prepare a company for mandatory e-invoicing in Greece?
You should:
- ensure that the financial system is XML/EN 16931 compliant,
- integrate with myDATA or a selected certified vendor,
- implement automated reporting to AADE,
- prepare processes for future B2B e-invoicing obligation. -
Can e-invoices in Greece be exchanged through Peppol?
Yes - Greece allows the use of the Peppol network, especially for international B2B transactions. Many certified suppliers are also Peppol Access Points.

