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Introduction

The myDATA (My Digital Accounting and Tax Application) platform is Greece’s standardized electronic invoicing and bookkeeping system, managed by the Independent Authority for Public Revenue (IAPR). This system enables businesses to report invoices and accounting data in real time, ensuring compliance with Greek tax regulations. This guide will walk you through the process of reporting invoices to the IAPR using myDATA, first registering a supplier, and then issuing invoices and credit notes in their name.

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Prerequisites

To issue invoices in Greece, you will need:
  • Supplier details, including company name, TIN, and address.
  • Customer details for B2B transactions, including name, TIN or international ID, and address.
  • Line and item details, including quantity, price, description, applicable VAT rates, and, optionally, income classification codes.
  • To have chosen an invoice series.

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Setup

To issue invoices, follow these instructions in the Invopop Console:
1

Connect ILYDA Greece App

  1. Navigate to Configuration → Apps.
  2. Find ILYDA Greece in the app discovery list.
  3. Click Connect to activate.
ILYDA Greece App
The ILYDA Greece app will send your invoices to the appropriate environment based on whether your current workspace is Sandbox or Live.
2

Prepare Invoice Workflow

IAPR Invoice Workflow

This workflow will issue an invoice through IAPR.

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Running

In this section, we’ll provide details on how to register new suppliers and issue invoices on their behalf.

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Register a supplier

Supplier registration is only possible in production. In the sandbox environment, your invoices must use a supplier with the tax ID code set to 177472438 which is the TIN of the test supplier pre-enabled in that environment.
Invopop has partnered with ILYDA to issue invoices in Greece. Each supplier must be registered with ILYDA before they can issue invoices. The registration process involves providing your company details, authorizing ILYDA as your electronic invoicing provider in TAXIS, and signing a service agreement.
Greek regulation does not allow two myDATA providers to operate simultaneously for the same VAT number. If a supplier currently uses a different provider, they must switch to ILYDA before issuing invoices through Invopop. Switching providers is allowed; the restriction only applies to simultaneous use. See the Greece FAQ for more details.
All communication with ILYDA must go through Invopop. Neither you nor the supplier should contact ILYDA directly at any point during or after the onboarding process. Direct contact can lead to confusion, billing issues, and delays. Always send any questions, documents, or requests to support@invopop.com.
1

Supplier authorizes ILYDA as their e-invoicing provider

The supplier must authorize ILYDA as their e-invoicing provider in TAXIS:
  1. Go to myTaxisnet and log in with the company’s credentials.
  2. Select the Authorizations (“Εξουσιοδοτήσεις”) tab on the left sidebar.
  3. Scroll down to the Providers of E-invoicing (“Πάροχοι Ηλεκτρονικής Τιμολόγησης”) section.
  4. Click New (“Νέα”).
  5. Enter ILYDA’s VAT number: 094359854 and submit the authorization.
Take note of the date the authorization was submitted — you will need it in the next step.
2

Send the supplier's details to Invopop

Contact support@invopop.com with the following information about the supplier you want to register:
  • Company name
  • Business activity
  • VAT number (ΑΦΜ)
  • Tax office (ΔΟΥ)
  • Full address
  • Phone number
  • Email address
  • Legal representative name
  • TAXIS authorization date (from step 1)
Also specify which document types the supplier needs to issue:
  • B2B: invoices issued to private sector businesses.
  • B2G: invoices issued to public sector entities.
  • B2C: documents issued for individual retail sales.
If the supplier issues B2C retail sales documents, Greek regulation requires them to have a backup internet service provider (ISP) to ensure uninterrupted connectivity with the e-invoicing platform. You must also provide:
  • ISP provider name
  • Contract number
  • Contract date
3

Sign the service agreement

Invopop will prepare a pre-filled service provision contract with ILYDA based on the details provided in step 2. We can send the contract directly to the supplier or to you as the integrator — let us know your preference. The supplier will have to review the contract, sign it, and return the signed copy to us.
4

Confirm and go live

Once Invopop receives the signed contract, we will complete the onboarding as soon as possible and notify you when the supplier is active and ready to issue invoices.

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Send an invoice

The following examples are of partial GOBL documents you can copy and paste directly into the Invopop Console or store via the API as silo entries. Then, you must run the “Issue IAPR Invoice” workflow created during setup. As usual, the recommended approach for running jobs is to perform two steps; first, upload the document to the silo, second create a job. GOBL Invoices sent to myDATA require the following properties to perform the correct normalization and validation steps. Invopop will try to assign these automatically, but we recommend defining them explicitly before uploading:
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"
    }
  }
}
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"
    }
  }
}
In this example, we’re issuing a climate fee invoice 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"
    }
  }
}

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