> ## Documentation Index
> Fetch the complete documentation index at: https://docs.invopop.com/llms.txt
> Use this file to discover all available pages before exploring further.
# myDATA & IAPR Guide
> Send invoices and credit notes to the Greek IAPR via the myDATA platform.
## 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.
| - | Sandbox | Live |
| --------------- | ---------------------------------------------- | ----------------------------------- |
| **Supplier** | Must use test supplier with tax ID `177472438` | Real supplier registration required |
| **Environment** | myDATA test | myDATA production |
## 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.
## Setup
To issue invoices, follow these instructions in the [Invopop Console](https://console.invopop.com):
1. Navigate to **Configuration** → **Apps**.
2. Find **ILYDA Greece** in the app discovery list.
3. Click **Connect** to activate.
The ILYDA Greece app will send your invoices to the appropriate environment based on whether your current workspace is Sandbox or Live.
This workflow will issue an invoice through IAPR.
Copy and paste into a new [Empty Invoice workflow](https://console.invopop.com/redirect/workflows/new?template=empty-invoice) code view.
```json Example MyDATA invoice workflow theme={"system"}
{
"name": "MyDATA issue invoice",
"description": "Issue an invoice to MyDATA via ILYDA",
"schema": "bill/invoice",
"steps": [
{
"id": "883baa10-abd5-11ef-8b96-dd5de8906f90",
"name": "Set 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 · 1",
"provider": "sequence.enumerate"
},
{
"id": "fc75e4f0-8721-11ef-a962-73e3f2037a52",
"name": "Sign envelope",
"provider": "silo.close"
},
{
"id": "649aca50-9064-11ef-8f9e-39835766d0bc",
"name": "Send invoice to MyDATA",
"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"
}
]
}
```
First, review our [workflows guide](/guides/features/workflows) to understand the basics.
In [Console](https://console.invopop.com) create a new workflow and select [Empty Invoice workflow](https://console.invopop.com/redirect/workflows/new?template=empty-invoice) in the template selector, then add the following steps:
1. **Set state** - to `Processing`.
2. **Add sequential code** - with dynamic sequences and a name like "IAPR Invoices".
3. **Sign envelope**: The envelope must be signed before processing.
4. **Send invoice to MyDATA**.
5. **Set state** - to `Sent`.
Finally, in the Error Handling area, add the **Set state** action and select `Error`.
Add any additional steps you may need, and save the new workflow.
## Running
In this section, we'll provide details on how to register new suppliers and issue invoices on their behalf.
### 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](https://ilyda.gr) 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](/faq/greece) 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](mailto:support@invopop.com).
The supplier must authorize ILYDA as their e-invoicing provider in TAXIS:
1. Go to [myTaxisnet](https://www1.gsis.gr/taxisnet/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.
Contact [support@invopop.com](mailto: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**
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.
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.
### Send an invoice
The following examples are of partial [GOBL](https://docs.gobl.org) documents you can copy and paste directly into the [Invopop Console](https://console.invopop.com) 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](/api-ref/silo/entries/create-an-entry-put), second [create a job](/api-ref/transform/jobs/create-a-job-put).
[GOBL Invoices](https://docs.gobl.org/draft-0/bill/invoice) 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:
* `$region` to be set to [`EL`](https://docs.gobl.org/regimes/gr)
* `$addons` to include [`gr-mydata-v1`](https://docs.gobl.org/addons/gr-mydata-v1)
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`](https://docs.gobl.org/addons/gr-mydata-v1) addon; this ensures the document will be validated and normalized using the myDATA v1 rules built into the [GOBL](https://docs.gobl.org) library,
* we've set the `services` tag; this makes the addon set the [`gr-mydata-invoice-type`](https://docs.gobl.org/addons/gr-mydata-v1#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`](https://docs.gobl.org/addons/gr-mydata-v1#payment-means) extension to `1` (credit transfer),
* we added a charge for a special fee (tourist accomodation fee), using the [`gr-mydata-fee`](https://docs.gobl.org/addons/gr-mydata-v1#fee-category) extension,
* the specific income category and type are set using the [`gr-mydata-income-cat`](https://docs.gobl.org/addons/gr-mydata-v1#income-classification-category) extension and the [`gr-mydata-income-type`](https://docs.gobl.org/addons/gr-mydata-v1#income-classification-type) extension respectively,
* only [VAT rates](https://docs.gobl.org/regimes/el#vat-rates) (`standard`) have been specified; percentages and values for the [`gr-mydata-vat-rate`](https://docs.gobl.org/addons/gr-mydata-v1#vat-rate) extension will be set automatically, and,
* there are no totals or calculations; all these will be made automatically when uploading.
```json B2B Services Invoice theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$addons": [
"gr-mydata-v1"
],
"$tags": [
"services",
"simplified"
],
"series": "XXGR",
"supplier": {
"name": "Αθηναϊκό Ξενοδοχείο Α.Ε.",
"tax_id": {
"country": "EL",
"code": "177472438"
},
"addresses": [
{
"num": "28",
"street": "Λεωφόρος Συγγρού",
"locality": "Αθήνα",
"code": "11743",
"country": "GR"
}
],
"emails": [
{
"addr": "reservations@athenianhotel.gr"
}
]
},
"customer": {
"name": "Τεχνολογικές Λύσεις Ελλάς Α.Ε.",
"tax_id": {
"country": "EL",
"code": "841442160"
},
"addresses": [
{
"num": "15",
"street": "Οδός Πανεπιστημίου",
"locality": "Αθήνα",
"code": "10671",
"country": "GR"
}
],
"emails": [
{
"addr": "accounting@techsolutions.gr"
}
]
},
"lines": [
{
"quantity": "3",
"item": {
"name": "Διαμονή Deluxe Δίκλινο Δωμάτιο",
"price": "180.00",
"unit": "day",
"ext": {
"gr-mydata-income-cat": "category1_3",
"gr-mydata-income-type": "E3_561_001"
}
},
"discounts": [
{
"reason": "Εταιρική Έκπτωση",
"percent": "10%"
}
],
"taxes": [
{
"cat": "VAT",
"rate": "general"
}
]
}
],
"charges": [
{
"reason": "Τέλος διαμονής παρεπιδημούντων",
"amount": "21.00",
"ext": {
"gr-mydata-fee": "18"
}
}
],
"payment": {
"instructions": {
"key": "credit-transfer"
}
}
}
```
```json Built version theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$regime": "EL",
"$addons": [
"gr-mydata-v1"
],
"$tags": [
"services",
"simplified"
],
"type": "standard",
"series": "XXGR",
"issue_date": "2026-04-20",
"currency": "EUR",
"tax": {
"ext": {
"gr-mydata-invoice-type": "11.2"
}
},
"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"
}
]
},
"lines": [
{
"i": 1,
"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"
}
},
"sum": "540.00",
"discounts": [
{
"reason": "Εταιρική Έκπτωση",
"percent": "10%",
"amount": "54.00"
}
],
"taxes": [
{
"cat": "VAT",
"key": "standard",
"rate": "general",
"percent": "24%",
"ext": {
"gr-mydata-vat-rate": "1"
}
}
],
"total": "486.00"
}
],
"charges": [
{
"i": 1,
"reason": "Τέλος διαμονής παρεπιδημούντων",
"amount": "21.00",
"ext": {
"gr-mydata-fee": "18",
"gr-mydata-tax-type": "2"
}
}
],
"payment": {
"instructions": {
"key": "credit-transfer",
"ext": {
"gr-mydata-payment-means": "1"
}
}
},
"totals": {
"sum": "486.00",
"charge": "21.00",
"total": "507.00",
"taxes": {
"categories": [
{
"code": "VAT",
"rates": [
{
"key": "standard",
"ext": {
"gr-mydata-vat-rate": "1"
},
"base": "486.00",
"percent": "24%",
"amount": "116.64"
}
],
"amount": "116.64"
}
],
"sum": "116.64"
},
"tax": "116.64",
"total_with_tax": "623.64",
"payable": "623.64"
}
}
```
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`](https://docs.gobl.org/addons/gr-mydata-v1#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`](https://docs.gobl.org/addons/gr-mydata-v1#payment-means) extension to `3` (cash),
* the specific income category and type are set using the [`gr-mydata-income-cat`](https://docs.gobl.org/addons/gr-mydata-v1#income-classification-category) extension and the [`gr-mydata-income-type`](https://docs.gobl.org/addons/gr-mydata-v1#income-classification-type) extension respectively,
* only [VAT rates](https://docs.gobl.org/regimes/el#vat-rates) (`standard`) or keys (`exempt`) have been specified; percentages and values for the [`gr-mydata-vat-rate`](https://docs.gobl.org/addons/gr-mydata-v1#vat-rate) extension will be set automatically
* the exemption cause is set using the [`gr-mydata-exemption`](https://docs.gobl.org/addons/gr-mydata-v1#vat-exemption-cause) extension, and,
* there are no totals or calculations; all these will be made automatically when uploading.
```json B2C Goods Invoice theme={"system"}
{
"$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"
}
}
}
```
```json Built version theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$regime": "EL",
"$addons": [
"gr-mydata-v1"
],
"$tags": [
"goods",
"simplified"
],
"type": "standard",
"series": "XXGR",
"issue_date": "2026-04-20",
"currency": "EUR",
"tax": {
"ext": {
"gr-mydata-invoice-type": "11.1"
}
},
"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": [
{
"i": 1,
"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"
}
},
"sum": "625.00",
"discounts": [
{
"reason": "Έκπτωση Όγκου",
"percent": "10%",
"amount": "62.50"
}
],
"taxes": [
{
"cat": "VAT",
"key": "standard",
"rate": "reduced",
"percent": "13%",
"ext": {
"gr-mydata-vat-rate": "2"
}
}
],
"total": "562.50"
},
{
"i": 2,
"quantity": "1",
"item": {
"name": "Βιβλία Μαγειρικής",
"price": "15.00",
"ext": {
"gr-mydata-income-cat": "category1_1",
"gr-mydata-income-type": "E3_561_001"
}
},
"sum": "15.00",
"taxes": [
{
"cat": "VAT",
"key": "exempt",
"ext": {
"gr-mydata-exemption": "3",
"gr-mydata-vat-rate": "7"
}
}
],
"total": "15.00"
}
],
"payment": {
"instructions": {
"key": "cash",
"ext": {
"gr-mydata-payment-means": "3"
}
}
},
"totals": {
"sum": "577.50",
"total": "577.50",
"taxes": {
"categories": [
{
"code": "VAT",
"rates": [
{
"key": "standard",
"ext": {
"gr-mydata-vat-rate": "2"
},
"base": "562.50",
"percent": "13%",
"amount": "73.13"
},
{
"key": "exempt",
"ext": {
"gr-mydata-exemption": "3",
"gr-mydata-vat-rate": "7"
},
"base": "15.00",
"amount": "0.00"
}
],
"amount": "73.13"
}
],
"sum": "73.13"
},
"tax": "73.13",
"total_with_tax": "650.63",
"payable": "650.63"
}
}
```
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`](https://docs.gobl.org/addons/gr-mydata-v1#invoice-type) to `11.2` (services receipt), appropriate for B2C,
* the accommodation line uses the [reduced VAT rate](https://docs.gobl.org/regimes/el#vat-rates) (`13%`); the [`gr-mydata-vat-rate`](https://docs.gobl.org/addons/gr-mydata-v1#vat-rate) extension is filled in on build,
* the climate crisis resilience fee is added as a [`charge`](https://docs.gobl.org/draft-0/bill/invoice) with [`gr-mydata-other-tax`](https://docs.gobl.org/addons/gr-mydata-v1#gr-mydata-other-tax) set to `22` (hotels 4 stars, 7.00€ per room/night) and [`gr-mydata-tax-type`](https://docs.gobl.org/addons/gr-mydata-v1#gr-mydata-tax-type) `3` (other tax), as in the built version,
* the `card` payment method maps to [`gr-mydata-payment-means`](https://docs.gobl.org/addons/gr-mydata-v1#payment-means) `7` (card payment), and,
* there are no totals in the minimal example; amounts are calculated when the document is built or uploaded.
```json B2C Accommodation + Climate Fee theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$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"
}
}
}
```
```json Built version theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$regime": "EL",
"$addons": [
"gr-mydata-v1"
],
"$tags": [
"services",
"simplified"
],
"type": "standard",
"series": "Plato",
"code": "216",
"issue_date": "2026-04-20",
"currency": "EUR",
"tax": {
"ext": {
"gr-mydata-invoice-type": "11.2"
}
},
"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": [
{
"i": 1,
"quantity": "2",
"item": {
"name": "Hotel room (2 nights)",
"price": "120.00"
},
"sum": "240.00",
"taxes": [
{
"cat": "VAT",
"key": "standard",
"rate": "reduced",
"percent": "13%",
"ext": {
"gr-mydata-vat-rate": "2"
}
}
],
"total": "240.00"
}
],
"charges": [
{
"i": 1,
"reason": "Climate Crisis Resilience Fee (2 nights x 7.00€)",
"amount": "14.00",
"ext": {
"gr-mydata-other-tax": "22",
"gr-mydata-tax-type": "3"
}
}
],
"payment": {
"instructions": {
"key": "card",
"ext": {
"gr-mydata-payment-means": "7"
}
}
},
"totals": {
"sum": "240.00",
"charge": "14.00",
"total": "254.00",
"taxes": {
"categories": [
{
"code": "VAT",
"rates": [
{
"key": "standard",
"ext": {
"gr-mydata-vat-rate": "2"
},
"base": "240.00",
"percent": "13%",
"amount": "31.20"
}
],
"amount": "31.20"
}
],
"sum": "31.20"
},
"tax": "31.20",
"total_with_tax": "285.20",
"payable": "285.20"
}
}
```
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`](https://docs.gobl.org/addons/gr-mydata-v1#invoice-type) extension,
* the climate fee is set as a charge using the [`gr-mydata-other-tax`](https://docs.gobl.org/addons/gr-mydata-v1#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`](https://docs.gobl.org/addons/gr-mydata-v1#payment-means) extension to `1` (credit transfer), and,
* there are no totals or calculations; all these will be made automatically when uploading.
```json B2B Climate Fee Invoice theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$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"
}
}
}
```
```json Built version theme={"system"}
{
"$schema": "https://gobl.org/draft-0/bill/invoice",
"$regime": "EL",
"$addons": [
"gr-mydata-v1"
],
"type": "other",
"series": "XXGR",
"issue_date": "2026-04-20",
"currency": "EUR",
"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": [
{
"i": 1,
"reason": "Τέλος ανθεκτικότητας στην κλιματική κρίση",
"amount": "3.00",
"ext": {
"gr-mydata-other-tax": "8",
"gr-mydata-tax-type": "3"
}
}
],
"payment": {
"instructions": {
"key": "credit-transfer",
"ext": {
"gr-mydata-payment-means": "1"
}
}
},
"totals": {
"sum": "0.00",
"charge": "3.00",
"total": "3.00",
"tax": "0.00",
"total_with_tax": "3.00",
"payable": "3.00"
}
}
```
## FAQ
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.
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.
The Greek tax authority (IAPR) requires the invoice type to be specified as part of the invoice. In [GOBL](https://docs.gobl.org), this type can be set using the `gr-mydata-invoice-type` extension in the tax section and setting the [GOBL invoice type](https://docs.gobl.org/draft-0/bill/invoice) to other.
Alternatively, GOBL will set the extension for you based on the type and the tax tags you set in your [GOBL invoice](https://docs.gobl.org/draft-0/bill/invoice). You can read more in the [GOBL Greece Tax Regime readme](https://github.com/invopop/gobl/blob/main/regimes/gr/README.md).
If you produce a PDF version of the invoice, the invoice type label will be displayed instead of "Invoice".
For further details on how GOBL prepares data for conversion, see the [Greek Tax Regime](https://github.com/invopop/gobl/blob/main/regimes/gr/README.md).
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.
See the [Greece tax regime in GOBL](https://docs.gobl.org/regimes/gr) for tax categories and AFM rules. The myDATA mapping lives in [`gr-mydata-v1`](https://docs.gobl.org/addons/gr-mydata-v1) including all invoice type codes.
More available in our [Greece FAQ](/faq/greece) section
***
Ask and answer questions about invoicing in Greece →