ILYDA Greece

Description
Actions
Workflows
Documents

View implementation guide ›


Developer	Invopop
Category	Government
Scope	B2B, B2C
Country	Greece

The IAPR in Greece stands for Independent Authority for Public Revenue (Ανεξάρτητη Αρχή Δημοσίων Εσόδων). It is the government agency responsible for managing tax collection and overseeing the myDATA platform, Greece’s standardized electronic invoicing and bookkeeping system.The myDATA (My Digital Accounting and Tax Application) platform enables businesses to report invoices and accounting data in real time, ensuring compliance with Greek tax regulations. The system validates invoice data and assigns a unique identifier (MARK) to each transaction, automatically generating electronic accounting books.Invopop has partnered with ILYDA to issue invoices in Greece. Each supplier must be registered with ILYDA to issue invoices on their behalf. This involves authorizing ILYDA as an electronic invoicing provider in Taxisnet, declaring ILYDA as invoice issuer in myDATA, and signing a service provision agreement with ILYDA.Key Features

Workflow Automation: This app provides automated workflows for issuing invoices and credit notes through the IAPR system via myDATA.
Real-Time Reporting: Every invoice is reported to myDATA in real time, ensuring compliance with Greek e-invoicing regulations.
MARK Assignment: Invoices receive a unique MARK (Μοναδικός Αριθμός Καταχώρησης) identifier from the IAPR system.
ILYDA Integration: Direct integration with ILYDA, an authorized technology provider for IAPR electronic invoicing.
EN 16931 Compliance: Compliant XML generation is supported for the Greek EN 16931 + CUIS schema.
QR Code: Generates the MyDATA QR code according to the IAPR specifications.
White-Label: the process allows issuance on behalf of clients (white-label) or directly as an organization, according to user needs.

Make sure to check out our myDATA & IAPR Guide for instructions on how to issue invoices and set up your workflows.

FAQ

Invoicing questions

What's the workflow for issuing myDATA invoices?

Build a GOBL invoice with the gr-mydata-v1 addon, run the IAPR Issue Invoice workflow. Invopop signs and transmits via ILYDA, retrieves the MARK identifier, and stores it on the silo entry.

How do I configure my workspace for Greek invoicing?

Install the ILYDA Greece app, register the supplier (one provider at a time per VAT — see our FAQ), and run invoices through the IAPR workflow. PDFs are generated alongside the myDATA submission.

How are Greek invoice types specified?

The Greek tax authority (IAPR) requires the invoice type to be specified as part of the invoice. In GOBL, this type can be set using the gr-mydata-invoice-type extension in the tax section and setting the GOBL invoice type to other.Alternatively, GOBL will set the extension for you based on the type and the tax tags you set in your GOBL invoice. You can read more in the GOBL Greece Tax Regime readme.If you produce a PDF version of the invoice, the invoice type label will be displayed instead of “Invoice”.

Where can I find the mapping of GOBL fields to myDATA?

For further details on how GOBL prepares data for conversion, see the Greek Tax Regime.

Why is my credit note being rejected with 'Invoice not found' error?

If you issue a credit note shortly after the invoice it refers to, the MyDATA system may reject it because the original invoice hasn’t completed synchronization. You’ll typically see an error like:

Fatal error 301: Invoice with ΜΑΡΚ xxxx not found for VAT number xxxx

This happens because there can be a delay between when an invoice is accepted by MyDATA and when it becomes fully available for reference by other documents like credit notes. This delay can range from a few minutes to several hours, depending on MyDATA system load.Solution: If you receive this error, retry issuing the credit note after waiting some time. You may need to wait anywhere from a few minutes to several hours for the original invoice to be fully synchronized in the MyDATA system before the credit note can successfully reference it.

Where do I find Greece-specific GOBL documentation?

See the Greece tax regime in GOBL for tax categories and AFM rules. The myDATA mapping lives in gr-mydata-v1 including all invoice type codes.

Registering supplier questions

How do I register a supplier with myDATA?

Production registration is multi-step: authorize ILYDA in Taxisnet, declare ILYDA as issuer in myDATA, sign the service agreement, then onboard with Invopop. Sandbox uses a shared pre-registered AFM, no manual steps required.

How do I onboard a new supplier with ILYDA?

Contact Invopop to begin the onboarding flow with ILYDA. The supplier authorizes ILYDA in Taxisnet, declares ILYDA as their issuer in myDATA, and signs ILYDA’s service agreement. Sandbox uses a shared test AFM (177472438).

What credentials does myDATA require to authenticate a supplier?

No supplier-side certificates. ILYDA submits to myDATA on the supplier’s behalf using its provider credentials, authorized by the supplier through Taxisnet. The supplier holds only their Taxisnet username/password.

How are supplier credentials stored in Invopop for Greece?

Suppliers don’t upload credentials to Invopop — ILYDA holds the IAPR submission credentials on the supplier’s behalf based on the Taxisnet authorization. Only the AFM and registration metadata are stored in Invopop.

More answers in our Greece FAQ section

The following workflows are available to make your integration easier. Use them as templates to build upon.

IAPR Greece invoice workflow

This workflow automates Greek invoice processing and tax compliance through myDATA.

Example IAPR invoice workflow

{
  "name": "Issue IAPR Invoice",
  "description": "Send GOBL invoices to the Greek IAPR via ILYDA eInvoicing.",
  "schema": "bill/invoice",
  "steps": [
    {
      "id": "883baa10-abd5-11ef-8b96-dd5de8906f90",
      "name": "Set Silo Entry State",
      "config": {
        "state": "processing"
      },
      "summary": "Set state to `processing`{.state .processing}",
      "provider": "silo.state"
    },
    {
      "id": "e9fad100-abd4-11ef-8b96-dd5de8906f90",
      "name": "Add Sequential Code",
      "config": {
        "name": "IAPR Invoices",
        "start": 1,
        "padding": 3
      },
      "summary": "Dynamic · IAPR Invoices · 1",
      "provider": "sequence.enumerate"
    },
    {
      "id": "fc75e4f0-8721-11ef-a962-73e3f2037a52",
      "name": "Sign Envelope",
      "provider": "silo.close"
    },
    {
      "id": "649aca50-9064-11ef-8f9e-39835766d0bc",
      "name": "Send to IAPR (via ILYDA)",
      "provider": "ilyda.send"
    },
    {
      "id": "6f77ad10-a32b-11ef-9707-79bbd71238cd",
      "name": "Set State",
      "config": {
        "state": "sent"
      },
      "summary": "Set state to `sent`{.state .sent}",
      "provider": "silo.state"
    }
  ],
  "rescue": [
    {
      "id": "e8c9c0a0-a32a-11ef-9707-79bbd71238cd",
      "name": "Set State",
      "config": {
        "state": "error"
      },
      "summary": "Set state to `error`{.state .error}",
      "provider": "silo.state"
    }
  ]
}

Add to my workspace →

Example service invoice (B2B)

In this example, we’re issuing a simple services invoice from a Greek supplier to another Greek business customer.Notice:

we’ve added the gr-mydata-v1 addon; this ensures the document will be validated and normalized using the myDATA v1 rules built into the GOBL library,
we’ve set the services tag; this makes the addon set the gr-mydata-invoice-type extension automatically to 2.1 (service invoice),
similarly, the credit-transfer payment method will cause the addon to set the gr-mydata-payment-means extension to 1 (credit transfer),
we added a charge for a special fee (tourist accomodation fee), using the gr-mydata-fee extension,
the specific income category and type are set using the gr-mydata-income-cat extension and the gr-mydata-income-type extension respectively,
only VAT rates (standard) have been specified; percentages and values for the gr-mydata-vat-rate extension will be set automatically, and,
there are no totals or calculations; all these will be made automatically when uploading.

{
  "$schema": "https://gobl.org/draft-0/bill/invoice",
  "$addons": [
    "gr-mydata-v1"
  ],
  "$tags": [
    "services",
    "simplified"
  ],
  "series": "XXGR",
  "supplier": {
    "name": "Αθηναϊκό Ξενοδοχείο Α.Ε.",
    "tax_id": {
      "country": "EL",
      "code": "177472438"
    },
    "addresses": [
      {
        "num": "28",
        "street": "Λεωφόρος Συγγρού",
        "locality": "Αθήνα",
        "code": "11743",
        "country": "GR"
      }
    ],
    "emails": [
      {
        "addr": "reservations@athenianhotel.gr"
      }
    ]
  },
  "customer": {
    "name": "Τεχνολογικές Λύσεις Ελλάς Α.Ε.",
    "tax_id": {
      "country": "EL",
      "code": "841442160"
    },
    "addresses": [
      {
        "num": "15",
        "street": "Οδός Πανεπιστημίου",
        "locality": "Αθήνα",
        "code": "10671",
        "country": "GR"
      }
    ],
    "emails": [
      {
        "addr": "accounting@techsolutions.gr"
      }
    ]
  },
  "lines": [
    {
      "quantity": "3",
      "item": {
        "name": "Διαμονή Deluxe Δίκλινο Δωμάτιο",
        "price": "180.00",
        "unit": "day",
        "ext": {
          "gr-mydata-income-cat": "category1_3",
          "gr-mydata-income-type": "E3_561_001"
        }
      },
      "discounts": [
        {
          "reason": "Εταιρική Έκπτωση",
          "percent": "10%"
        }
      ],
      "taxes": [
        {
          "cat": "VAT",
          "rate": "general"
        }
      ]
    }
  ],
  "charges": [
    {
      "reason": "Τέλος διαμονής παρεπιδημούντων",
      "amount": "21.00",
      "ext": {
        "gr-mydata-fee": "18"
      }
    }
  ],
  "payment": {
    "instructions": {
      "key": "credit-transfer"
    }
  }
}

Example retail sales receipt (B2C)

In this example, we’re issuing a simple goods invoice from a Greek supplier to a Greek final consumer.Notice:

we’ve set the goods and the simplified tags; this makes the addon set the gr-mydata-invoice-type extension automatically to 11.1 (retail sales receipt),
similarly, the cash payment method will cause the addon to set the gr-mydata-payment-means extension to 3 (cash),
the specific income category and type are set using the gr-mydata-income-cat extension and the gr-mydata-income-type extension respectively,
only VAT rates (standard) or keys (exempt) have been specified; percentages and values for the gr-mydata-vat-rate extension will be set automatically
the exemption cause is set using the gr-mydata-exemption extension, and,
there are no totals or calculations; all these will be made automatically when uploading.

{
  "$schema": "https://gobl.org/draft-0/bill/invoice",
  "$addons": [
    "gr-mydata-v1"
  ],
  "$tags": [
    "goods",
    "simplified"
  ],
  "series": "XXGR",
  "supplier": {
    "name": "Ελληνικά Τρόφιμα Α.Ε.",
    "tax_id": {
      "country": "EL",
      "code": "177472438"
    },
    "addresses": [
      {
        "num": "12",
        "street": "Λεωφόρος Βουλιαγμένης",
        "locality": "Αθήνα",
        "code": "11636",
        "country": "GR"
      }
    ],
    "emails": [
      {
        "addr": "hellenicfoods@example.com"
      }
    ]
  },
  "lines": [
    {
      "quantity": "50",
      "item": {
        "name": "Ελαιόλαδο Extra Virgin 1L",
        "price": "12.50",
        "unit": "unit",
        "ext": {
          "gr-mydata-income-cat": "category1_1",
          "gr-mydata-income-type": "E3_561_001"
        }
      },
      "discounts": [
        {
          "reason": "Έκπτωση Όγκου",
          "percent": "10%"
        }
      ],
      "taxes": [
        {
          "cat": "VAT",
          "rate": "reduced"
        }
      ]
    },
    {
      "quantity": "1",
      "item": {
        "name": "Βιβλία Μαγειρικής",
        "price": "15.00",
        "ext": {
          "gr-mydata-income-cat": "category1_1",
          "gr-mydata-income-type": "E3_561_001"
        }
      },
      "taxes": [
        {
          "cat": "VAT",
          "key": "exempt",
          "ext": {
            "gr-mydata-exemption": "3"
          }
        }
      ]
    }
  ],
  "payment": {
    "instructions": {
      "key": "cash"
    }
  }
}

Example accommodation + climate fee invoice (B2C)

In this example, we’re issuing a retail sales receipt for a hotel stay (accommodation taxed at the reduced VAT rate) together with the climate crisis resilience fee on the same document.Notice:

we’ve set the services and simplified tags; the addon sets gr-mydata-invoice-type to 11.2 (services receipt), appropriate for B2C,
the accommodation line uses the reduced VAT rate (13%); the gr-mydata-vat-rate extension is filled in on build,
the climate crisis resilience fee is added as a charge with gr-mydata-other-tax set to 22 (hotels 4 stars, 7.00€ per room/night) and gr-mydata-tax-type 3 (other tax), as in the built version,
the card payment method maps to gr-mydata-payment-means 7 (card payment), and,
there are no totals in the minimal example; amounts are calculated when the document is built or uploaded.

{
  "$schema": "https://gobl.org/draft-0/bill/invoice",
  "$regime": "EL",
  "$addons": [
    "gr-mydata-v1"
  ],
  "$tags": [
    "services",
    "simplified"
  ],
  "series": "Plato",
  "code": "216",
  "supplier": {
    "name": "Cyberdyne Συστήματα Α.Ε.",
    "tax_id": {
      "country": "EL",
      "code": "177472438"
    },
    "addresses": [
      {
        "num": "28",
        "street": "Λεωφόρος Συγγρού",
        "locality": "Αθήνα",
        "code": "11743",
        "country": "GR"
      }
    ],
    "emails": [
      {
        "addr": "reservations@athenianhotel.gr"
      }
    ]
  },
  "lines": [
    {
      "quantity": "2",
      "item": {
        "name": "Hotel room (2 nights)",
        "price": "120.00"
      },
      "taxes": [
        {
          "cat": "VAT",
          "rate": "reduced"
        }
      ]
    }
  ],
  "charges": [
    {
      "reason": "Climate Crisis Resilience Fee (2 nights x 7.00€)",
      "amount": "14.00",
      "ext": {
        "gr-mydata-other-tax": "22"
      }
    }
  ],
  "payment": {
    "instructions": {
      "key": "card"
    }
  }
}

Example climate fee standalone invoice (B2B)

In this example, we’re issuing a standalone climate fee invoice (no lines) from a Greek supplier to another Greek business customer. This is an example of how special records and other document types can be used in Greece.Notice:

we’ve set the other type and the 8.2 invoice type (climate crisis fee collection) explicitly using the gr-mydata-invoice-type extension,
the climate fee is set as a charge using the gr-mydata-other-tax extension set to 8 (climate crisis fee),
there are no lines as this special record type doesn’t allow them,
the credit-transfer payment method will cause the addon to set the gr-mydata-payment-means extension to 1 (credit transfer), and,
there are no totals or calculations; all these will be made automatically when uploading.

{
  "$schema": "https://gobl.org/draft-0/bill/invoice",
  "$addons": [
    "gr-mydata-v1"
  ],
  "type": "other",
  "series": "XXGR",
  "tax": {
    "ext": {
      "gr-mydata-invoice-type": "8.2"
    }
  },
  "supplier": {
    "name": "Αθηναϊκό Ξενοδοχείο Α.Ε.",
    "tax_id": {
      "country": "EL",
      "code": "177472438"
    },
    "addresses": [
      {
        "num": "28",
        "street": "Λεωφόρος Συγγρού",
        "locality": "Αθήνα",
        "code": "11743",
        "country": "GR"
      }
    ],
    "emails": [
      {
        "addr": "reservations@athenianhotel.gr"
      }
    ]
  },
  "customer": {
    "name": "Τεχνολογικές Λύσεις Ελλάς Α.Ε.",
    "tax_id": {
      "country": "EL",
      "code": "841442160"
    },
    "addresses": [
      {
        "num": "15",
        "street": "Οδός Πανεπιστημίου",
        "locality": "Αθήνα",
        "code": "10671",
        "country": "GR"
      }
    ],
    "emails": [
      {
        "addr": "accounting@techsolutions.gr"
      }
    ]
  },
  "charges": [
    {
      "reason": "Τέλος ανθεκτικότητας στην κλιματική κρίση",
      "amount": "3.00",
      "ext": {
        "gr-mydata-other-tax": "8"
      }
    }
  ],
  "payment": {
    "instructions": {
      "key": "credit-transfer"
    }
  }
}

🇬🇷 Invopop resources for Greece


Compliance	Invoicing compliance in Greece Compliance timeline
Apps	ILYDA Greece
Guides	IAPR Guide
FAQ	Greece FAQ
GOBL	Greece Tax Regime Greece MyData Addon

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