# 10 Essential Questions About TIN in Greece

> Verify Greek Tax IDs (AFM & VAT) instantly. Prepare for the 2026 mandatory myDATA e-invoicing, navigate AADE and G.E.MI. registries, and ensure seamless KYB with TaxDo

Source: https://taxdo.com/resources/faq/post/verify-greece-afm-vat-tin

Last updated: 2026-04-17

In one of the most rapidly modernizing digital economies in the Mediterranean, a precise understanding of Greece’s Tax Identification Number (TIN) — the **AFM** (_Arithmos Forologikou Mitrou_) — is essential for corporate compliance, KYB checks, and navigating the 2026 transition to mandatory B2B e-invoicing. Governed by the Independent Authority for Public Revenue (**AADE**), the Greek tax landscape is shifting toward full transparency through the **myDATA** platform, making real-time validation a mission-critical requirement for any business operating in the region.  
Having a single trusted resource that answers every key question in one place makes all the difference between smooth operations and costly administrative friction, such as blocked tax deductions or penalties for non-compliance. This FAQ blog delivers clear, complete answers to the 10 most essential questions about Greek TINs — from definition and formats to the 2026 digital mandates.  
Businesses that make the smart choice to use [TaxDo’s GTL (Global TIN Lookup)](https://taxdo.com/services/tax-id-validator) connect instantly to official Greek national registries, complete every check in one click, and eliminate manual errors—ensuring fast, accurate, and fully compliant Tax ID verification for tax, onboarding, customs, and regulatory reporting purposes.

## Frequently asked questions

### 1. What is a TIN in Greece?

In Greece, the Tax Identification Number is universally known as the **AFM** (_Αριθμός Φορολογικού Μητρώου_).

The AFM is a unique 9-digit identifier assigned to every individual, legal entity, and business operating in Greece. It serves as the master key for all fiscal interactions, including filing income tax, opening bank accounts, and registering property. For businesses, the AFM also forms the basis of their VAT identity within the European Union.

### 2. What types of TIN numbers exist?

Greece utilizes a unified AFM system, but it is categorized by the nature of the taxpayer:

- **AFM for Individuals:** Assigned to Greek citizens, residents, and foreign nationals with financial interests in Greece.
- **AFM for Business Entities:** Assigned to corporations (SA, LLC, etc.), partnerships, and sole traders.
- **VAT Number (EL + AFM):** For entities registered for Value Added Tax, the AFM is prefixed with the country code "**EL**" (e.g., EL123456789).
- **G.E.MI. Number:** The General Commercial Registry number used for legal identification of companies, alongside the AFM.

### 3. What is the format of the TIN?

Greek identification numbers follow a standardized numeric pattern designed for AADE’s high-speed digital systems.

- **The AFM Structure:** Consists of exactly **9 numeric digits** (e.g., `123456789`).
- **The VAT Structure:** Comprises the prefix "**EL**" followed by the 9-digit AFM (e.g., `EL123456789`).
- **The IACS Structure:** A specialized alphanumeric identifier used for agricultural holdings and EU subsidy management.

**Technical Insight:** The final digit of the 9-digit AFM is a **checksum** calculated using a specific weighted formula. Because Greece is implementing mandatory real-time reporting via myDATA in 2026, validating the AFM is critical; an incorrect number will cause e-invoice submissions to be rejected by the AADE servers, leading to immediate operational disruptions.

### 4. Which authority issues the TIN?

The [Independent Authority for Public Revenue (AADE)](https://www.aade.gr/) is the central authority responsible for issuing and managing the AFM.

Business registration is coordinated through the [General Commercial Registry (G.E.MI.)](https://www.businessportal.gr/), often utilizing the "One-Stop Shop" (**YMS**) service which automatically triggers the issuance of an AFM upon company formation.

### 5. Who needs to register for a TIN? (2026 Update)

**VAT Registration Thresholds:**

- **Mandatory Registration:** Established businesses must register for VAT if their annual turnover exceeds **€10,000**. Non-established (foreign) businesses have a **Nil Threshold** and must register from their first sale.
- **Mandatory E-Invoicing (2026):** Starting **March 2, 2026**, B2B e-invoicing becomes mandatory for large companies (turnover >€1M), extending to **all businesses by October 1, 2026**.

**VAT Rates (2026):**

- **Standard Rate:** 24% (Applies to most goods and services).
- **Reduced Rates:** 13% (Food, catering, hotel stay) and 6% (Medicines, books, energy).

### 6. How to register for a TIN (AFM) in Greece?

Registration has been simplified through the digital **e-YMS** and **myAADE** platforms to reduce bureaucracy.

- **Step 1: The One-Stop Shop (YMS):** Most businesses register via the [General Commercial Registry (G.E.MI.)](https://www.businessportal.gr/). This service automatically handles the articles of association and notifies the tax office.
- **Step 2: Automatic AFM Issuance:** Once the YMS processes the business formation, the **AADE** generates the AFM and VAT number (if requested) automatically.
- **Step 3: myDATA Activation:** As of 2026, new businesses must immediately activate their **myDATA** credentials to comply with real-time digital reporting requirements.
- **Step 4: Individuals & Foreigners:** Non-residents must appoint a **Tax Representative** in Greece and apply at a local Public Financial Office (**DOY**) or via the **myAADE** portal.

### 7. How to verify a TIN in Greece?

The most reliable way to verify a Greek AFM is through the AADE’s integrated digital services.

- **AADE Verification:** Use the [myAADE "Check a VAT ID"](https://www.aade.gr/epiheiriseis/forologikes-ypiresies/mitroo/anazitisi-stoiheion-epiheiriseon&authuser=1) tool to confirm the active status, legal name, and VAT eligibility of a business.
- **VAT Check:** Validate "EL" numbers via the EU **VIES** system, which is linked directly to the Greek national database.

Because an AFM can be active for tax purposes but "Suspended" or "Inactive" for VAT, manual checks are often too slow for the 2026 myDATA workflow. Enterprise teams use [automated real-time lookups](https://taxdo.com/services/tax-id-validator) to ensure every identifier is valid and "Active" before issuing e-invoices.

### 8. How TaxDo Helps Companies with TIN Compliance in Greece?

The 2026 shift to mandatory B2B e-invoicing via myDATA leaves no room for manual entry errors. TaxDo provides the essential automation layer for Greek compliance:

- **GSV (Global Syntax Validation):** Provides structural and checksum checks for the 9-digit **AFM** and **EL** VAT numbers, catching errors before they cause a myDATA rejection.
- **GTL (Global Real-Time Tax ID Verify/Lookup):** Connects directly to **AADE** and **VIES** databases. [TaxDo’s GTL ensures your partners are active](https://taxdo.com/services/tax-id-validator) and correctly categorized, protecting your business from the "Invalid Invoice" penalties common under the new 2026 mandates.

**TaxDo TIN Validation Coverage in Greece**

| **Entity Type** | **Identifier Type**       | **Covered by Product**      |
| --------------- | ------------------------- | --------------------------- |
| Business        | **VAT Number (EL+AFM)**   | **GTL (Official Lookup)**   |
| Business        | **AFM (Tax ID)**          | **GTL (Official Lookup)**   |
| Business        | **AFM (Tax ID)**          | **GSV (Syntax Validation)** |
| Business        | **IACS (Agri ID)**        | **GSV (Syntax Validation)** |
| Individual      | **AFM (Personal Tax ID)** | **GSV (Syntax Validation)** |

### 9. What are the uses of TIN for businesses in Greece?

**In the Greek market, a verified AFM is the absolute baseline for navigating the myDATA digital reporting system and fulfilling mandatory KYB due diligence.**

| **Business Context**     | **Key Usage of TIN (AFM / EL)**                       | **Compliance Criticality**                                                                                 |
| ------------------------ | ----------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- |
| **E-Invoicing (myDATA)** | Submitting B2B/B2G invoices for real-time validation. | **Blocker:** Invoices with an unverified AFM will be rejected by AADE servers.                             |
| **KYB & AML**            | Verifying company status via G.E.MI. and AADE.        | **Mandatory:** AML regulations require verifying the partner's AFM against official commercial registries. |
| **Banking**              | Opening corporate accounts & international transfers. | **Mandatory:** No financial transaction can occur in Greece without a verified AFM.                        |
| **Customs**              | Linking the **EORI** number to the AFM.               | **Blocker:** Goods will be impounded at Piraeus or Thessaloniki without a valid AFM-linked EORI.           |

### 10. What happens if a TIN is incorrect or missing?

Using an unverified Greek AFM exposes businesses to immediate financial and operational risks:

- **myDATA Rejections:** Invoices issued to an incorrect AFM cannot be validated by the AADE system, meaning the transaction is not legally recognized.
- **Loss of VAT Deduction:** The tax authority will automatically disallow the recovery of 24% VAT if the buyer's AFM is invalid at the time of the transaction.
- **KYB Rejections:** Under strict EU AML rules, Greek banks will freeze accounts linked to unverified or "dormant" AFMs.
- **Customs Penalties:** Incorrect Tax IDs on import declarations result in immediate seizures and storage fines at Greek ports.

## Conclusion

Greece is entering a new era of digital tax enforcement where the **AFM** is the digital fingerprint of every business transaction. A valid AFM proves an entity exists, but real-time verification through **myDATA** is what ensures your business can actually trade.

[TaxDo](https://taxdo.com/services/tax-id-validator) provides the critical automation layer needed to navigate Greece's high-stakes 2026 e-invoicing environment. By integrating TaxDo’s GTL and GSV solutions, you eliminate the risks of manual errors and ensure your Greek operations are 100% compliant with AADE mandates. Don't risk blocked e-invoices or customs delays—automate your Greek tax ID verification with TaxDo today.