Greek invoicing is changing quickly. For years, many freelancers and small businesses in Greece have created invoices through accounting software, spreadsheets, PDF templates, or their accountant's tools. That is no longer enough on its own.
Greece is moving toward a more digital, real-time tax reporting environment built around AADE's myDATA platform, electronic books, and mandatory electronic invoicing for more transaction types. The goal is to reduce manual reporting, improve VAT transparency, and allow invoice data to flow directly into the tax authority's systems.
For freelancers and SMEs, this does not necessarily mean that invoicing has to become complicated. But it does mean that invoice data needs to be created, classified, transmitted, and stored in the correct way.
What is myDATA?
myDATA stands for "my Digital Accounting and Tax Application." It is the digital platform of the Independent Authority for Public Revenue, known as AADE, used for the transmission of accounting and tax data in Greece. AADE describes myDATA as part of the Greek digital tax infrastructure, including electronic books, invoicing providers, ERP transmission routes, and the official timologio application.
In practical terms, myDATA allows businesses to transmit summaries of their revenue, expense documents, and certain accounting classifications to AADE. These transmissions help populate the business's electronic books.
Issuing an invoice is no longer just about creating a PDF for the customer. The invoice data also needs to be reported correctly to AADE.
Is eInvoicing the same as myDATA reporting?
Not exactly. This is one of the most common sources of confusion.
myDATA reporting refers to the transmission of invoice and accounting data to AADE's platform.
Electronic invoicing, or eInvoicing, usually refers to the issuance and exchange of invoices in a structured electronic format through approved digital channels.
A normal PDF invoice sent by email may look digital, but that does not necessarily make it a compliant structured eInvoice. A true eInvoice is usually machine-readable and can be processed automatically by tax systems, accounting systems, or public procurement platforms.
For many businesses, the compliance journey has two layers: correct reporting of invoice data to myDATA, and issuing structured electronic invoices where legally required.
Who is affected by Greek invoicing and reporting requirements?
The Greek digital reporting framework affects businesses and professionals that maintain accounting records under Greek rules. That includes many freelancers, consultants, service providers, agencies, shops, and SMEs.
The exact requirements depend on factors such as whether the transaction is B2B, B2C, B2G, domestic, EU, or non-EU; whether the business issues wholesale invoices, retail receipts, or other document types; whether the business uses an ERP, a certified eInvoicing provider, AADE's timologio application, or another approved transmission method; and the applicable implementation timeline.
Because the rules are technical and evolving, businesses should confirm the details with their accountant or tax advisor. However, the overall direction is clear: Greek invoicing is becoming increasingly digital, structured, and connected to AADE.
B2G eInvoicing: invoices to the public sector
Greece has already adopted electronic invoicing requirements for public procurement. The European Commission notes that Greek public contracting authorities are required to accept and process electronic invoices that comply with the European eInvoicing standard, EN 16931. It also states that private suppliers are obliged to issue eInvoices for public contracts, with mandatory requirements expanding for public-sector expenditure.
For businesses selling to public authorities, this means eInvoicing is not just a future issue. It may already be relevant depending on the contract, customer, and invoice value.
B2B eInvoicing: what is changing in 2026?
The major upcoming change is mandatory B2B electronic invoicing in Greece.
Recent guidance and market updates indicate that Greece is rolling out mandatory B2B eInvoicing in phases during 2026. Reports following the 2026 framework describe an initial phase for larger businesses, followed by broader application to remaining businesses later in 2026.
The invoicing tool you use should not only create nice-looking invoices. It should also support the digital reporting and eInvoicing workflows that Greek law increasingly requires.
What information needs to be handled correctly?
A compliant Greek invoicing workflow is about more than the customer name and invoice amount. Depending on the invoice type and transaction, your system may need to correctly handle:
- issuer details and customer details;
- Greek VAT number / AFM;
- invoice type, series, numbering, and issue date;
- VAT category, VAT rate, net value, VAT value, and gross total;
- income classification and, where relevant, expense classification;
- payment method information;
- transmission to myDATA;
- receipt of AADE identifiers such as MARK;
- storage of invoice data and audit trail.
AADE's documentation for eInvoicing service providers states that transmitted eInvoices undergo basic controls by the myDATA platform and receive a Unique Entry Number, which must be indicated on invoices issued by licensed software. It also states that transmission by providers is performed in real time and automatically after issuance. That is why modern invoicing software needs to be built around structured data, not just PDF generation.
Why freelancers and SMEs should prepare early
Many small businesses wait until the last moment to adapt to compliance changes. That is understandable, but risky.
Invoicing touches cash flow. If invoices are delayed because of technical or compliance issues, payments may also be delayed. Invoicing workflows are also habit-based, and switching away from manual documents takes time.
eInvoicing is not only about software. Businesses may need to review invoice numbering, VAT setup, customer data, payment terms, accountant workflows, and internal approval processes. As deadlines approach, accountants and service providers may have limited capacity to help every client at the same time.
What should a good invoicing system do?
For a Greek freelancer or SME, a modern invoicing system should make compliance easier without turning invoicing into accounting software complexity.
- create professional invoices quickly;
- store customer and company data correctly;
- apply the right VAT treatment;
- support Greek invoice types and reporting requirements;
- transmit or prepare invoice data for myDATA;
- support eInvoicing workflows as they become mandatory;
- track invoice status;
- send payment reminders;
- keep records accessible for the business and accountant.
For service businesses, time tracking is especially useful. Many freelancers, consultants, designers, developers, agencies, and professional-service firms invoice based on hours or projects. A system that turns billable time into invoices can reduce mistakes and save significant administrative time.
Common mistakes businesses should avoid
1. Treating PDF invoices as electronic invoices
A PDF sent by email is digital, but it is not necessarily a structured eInvoice. Businesses should understand whether their invoice format meets the applicable requirements.
2. Waiting until the deadline
Software setup, accountant coordination, customer data cleanup, and workflow changes all take time.
3. Ignoring invoice classifications
myDATA reporting depends on structured classifications. Wrong classifications can create reconciliation issues and may require corrections later.
4. Using tools that are not designed for Greek requirements
Generic international invoicing tools may be excellent for simple invoice creation, but not all of them are built around Greek myDATA and eInvoicing workflows.
5. Separating invoicing from payment collection
A compliant invoice is important, but getting paid is just as important. Payment reminders and online payment options can make a real difference to cash flow.
How easyTimi helps
easyTimi is being built for freelancers and SMEs that want invoicing to stay simple while Greek compliance requirements become more digital.
The goal is to combine simple invoice creation, intuitive time tracking, professional invoice PDFs, automatic payment reminders, online payment options, and Greek eInvoicing and myDATA-oriented workflows.
The idea is not to replace your accountant. Instead, easyTimi helps you create cleaner invoice data, manage your invoicing workflow, and give your accountant better information.
Final thoughts
Greek invoicing is moving from manual document creation toward structured digital reporting. For freelancers and SMEs, this shift may feel technical, but the basic business goal remains simple:
Create correct invoices, report them properly, keep clean records, and get paid on time.
The businesses that prepare early will have an easier transition. They will also benefit from cleaner workflows, fewer manual errors, and better visibility over their income. eInvoicing should not make invoicing harder. With the right tools, it can make invoicing faster, cleaner, and more reliable.