SAP Document and Reporting Compliance in Greece
Tue, Jan 13, 2026
e-Invoicing Mandates in Greece: What Businesses Need to Know and How to Prepare
Greece is entering a new and significant phase of its digital tax transformation with the introduction of mandatory electronic invoicing (e-Invoicing) for domestic transactions. While electronic reporting has existed for several years, the current regulatory focus is shifting decisively toward structured, system-driven invoice exchange.
For businesses operating in Greece, the most important questions are no longer whether digital invoicing will apply, but which transactions are in scope, when obligations take effect, and how to prepare operationally and technically.
This article focuses specifically on Greece’s e-Invoicing mandate, outlining its scope, phased timeline, and the key considerations for organizations, particularly those running SAP, preparing for compliance.
The First and Most Important Question: Does the e-Invoicing Mandate Apply to My Business?
Before assessing systems, integrations, or compliance tooling, organizations must first establish whether the mandate applies to them. Applicability depends primarily on transaction type and customer category, rather than industry alone.
Understanding this upfront prevents unnecessary system changes while ensuring timely compliance where required.
Transaction Scope at a Glance
B2G (Business-to-Government)
Mandatory electronic invoicing for suppliers to Greek public sector entities is already in place. Organizations issuing invoices to government bodies are required to comply with existing e-Invoicing rules and platforms.
B2B (Business-to-Business)
Greece is introducing mandatory B2B e-Invoicing for domestic transactions, beginning with a phased rollout from February 2025. Early phases may apply to specific categories of businesses, such as those exceeding defined revenue thresholds, before broader expansion.
B2C (Business-to-Consumer)
At this stage, B2C transactions are not subject to mandatory e-Invoicing. While consumer transaction data may still be reported through other mechanisms, structured electronic invoicing is not currently required for B2C scenarios.
For organizations operating across multiple transaction types, distinguishing between these categories is essential for accurate compliance planning.
Timeline and Transition Period
To support adoption and minimize disruption, the Greek tax authorities are implementing B2B e-Invoicing through a phased approach.
Key Milestones
- Initial go-live: February 2025
- Scope: Domestic B2B transactions for qualifying businesses
- Transition period: Until 31 March 2025
During the transition period:
- Existing invoicing methods may continue
- e-Invoicing can operate in parallel, provided invoice data is correctly declared to the Greek tax authorities
This transition window allows organizations to test new invoicing processes, stabilize integrations, and resolve data quality issues before full enforcement.
e-Invoicing vs. myDATA: Understanding the Difference
One of the most common sources of confusion in Greece’s digital tax landscape is the distinction between e-Invoicing and myDATA.
- e-Invoicing refers to the creation, exchange, and transmission of invoices in a structured electronic format, often via certified platforms or service providers.
- myDATA is the electronic accounting and tax reporting platform operated by the Greek tax authority, used for classification, reconciliation, and audit purposes.
While interconnected, these are not the same obligation. The current regulatory emphasis for businesses is on mandatory B2B e-Invoicing, with myDATA functioning as a downstream reporting and reconciliation mechanism rather than the primary focus.
What This Means for SAP Customers
For organizations running SAP S/4HANA or SAP ECC, the mandate introduces both compliance requirements and system architecture considerations.
Key requirements include:
- Generation of structured electronic invoices compliant with Greek specifications
- Secure transmission through approved e-Invoicing channels
- Alignment between invoicing data, accounting postings, and statutory tax reporting
- End-to-end auditability and traceability within the ERP landscape
As standard SAP functionality does not yet fully address Greece’s specific B2B e-Invoicing requirements, many organizations will need to evaluate partner-delivered or add-on solutions to ensure compliance without compromising existing business processes.
Enabling e-Invoicing Compliance with SAP
SAP-integrated e-Invoicing solutions tailored for Greece enable organizations to:
- Comply with mandatory B2B and existing B2G e-Invoicing requirements
- Automate invoice generation, validation, and submission
- Maintain consistency across invoicing, finance, and tax data
- Reduce manual intervention, errors, and compliance risk
- Establish a scalable foundation for future regulatory extensions
Such solutions are designed to integrate seamlessly into SAP environments while remaining flexible enough to adapt to evolving Greek and EU-level mandates, including VAT in the Digital Age (ViDA).
Why Early Preparation Matters
Although transition periods are available, postponing preparation increases both operational and compliance risk. Organizations relying on manual processes or fragmented systems may face challenges as enforcement strengthens and data expectations increase.
Early preparation allows businesses to:
- Confirm applicability and transaction scope
- Design scalable, SAP-integrated compliance solutions
- Test parallel invoicing processes during the transition phase
- Avoid last-minute implementation pressure and business disruption
Greece’s move toward mandatory B2B e-Invoicing marks a critical step in its broader digital tax strategy. For businesses, success depends on asking the right questions early, clearly understanding whether and how the mandate applies, and implementing solutions aligned with both regulatory requirements and operational realities.
By focusing on e-Invoicing as a core business process, not just a reporting obligation, organizations can transform compliance into a structured, future-ready capability rather than a reactive burden.