Ireland Tax ID Number (TIN) Guide​ 

Introduction

In Ireland, Tax Identification Numbers (TINs) are essential unique identifiers used by individuals and entities to comply with tax regulations. Accurate TINs facilitate proper tax reporting, filing, and compliance with the Revenue Commissioners, Ireland’s tax authority. All information provided here is verified from official sources, including the Revenue Commissioners’ website.​ 

Tax Identification Number Types 

In Ireland, the primary types of TINs are:​ 

• Personal Public Service Number (PPSN): Assigned to individuals for accessing public services, including tax-related activities.​ 

• Tax Reference Number (TRN): Issued to businesses and other entities for tax purposes. For sole traders, the TRN is the same as their PPSN once registered with Revenue.  

• Value-Added Tax (VAT) Number: Assigned to businesses registered for VAT purposes.​

TIN Format and Structure 

• PPSN: 
  • Format: Seven digits followed by one or two letters (e.g., 1234567AB).​ 
  • Structure: 
    • First seven digits: Unique sequential number. 
    • Final one or two letters: Serve as a check character. 

• TRN: 
  • Format: For sole traders, it matches the PPSN format. For companies, it is typically a unique number assigned upon registration.​ 
  • Structure: 
    • Sole traders: Same as PPSN. 
    • Companies: Unique identifier assigned by Revenue. 
• VAT Number: 
  • Format: Consists of the prefix ‘IE’ followed by eight characters (e.g., IE1234567A).​ 
  • Structure: 
    • ‘IE’ prefix: Country code for Ireland. 
    • Seven digits followed by one letter: Unique identifier for the business. 

Issuing Authority and Registration Process 

Issuing Authority: The Revenue Commissioners are responsible for issuing TINs in Ireland.​ 

Registration Process: 

• Individuals (PPSN): 
  • Eligibility: All individuals requiring access to public services, including tax services. 
  • Documents Required: Proof of identity and address. 
  • Application Process: 
    • Apply through the Department of Social Protection (DSP). 
    • Detailed information is available on the DSP website. 

• Sole Traders (TRN): 
  • Eligibility: Individuals starting a business as sole traders. 
  • Documents Required: PPSN, business details. 
  • Application Process: 
    • Register for Income Tax through Revenue’s myAccount portal. 
    • Steps include signing into myAccount, selecting ‘Tax registrations,’ choosing ‘Income Tax,’ and providing business details.  

• Companies (TRN): 
  • Eligibility: Newly formed companies. 
  • Documents Required: Companies Registration Office (CRO) number. 
  • Application Process: 
    • Submit a completed Form TR2 to Revenue. 
    • If represented by a tax agent, registration can be done online through Revenue Online Service (ROS).  

• VAT Registration: 
  • Eligibility: Businesses exceeding the VAT threshold or those electing to register voluntarily. 
  • Documents Required: Business details, tax registration number. 
  • Application Process: 
    • Register online through ROS. 
    • Choose between ‘domestic-only’ or ‘intra-EU’ registration, depending on business activities.  

TIN Verification and Lookup 

Individuals and businesses can verify TINs through the following means:​ 

• PPSN Verification: Individuals can confirm their PPSN by contacting the Department of Social Protection. 

• VAT Number Verification: 

• Businesses can verify VAT numbers using the EU’s VIES (VAT Information Exchange System) to ensure the validity of a VAT number within the EU.

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TIN and VAT Number Connection 

In Ireland, the VAT number is distinct from other TINs. While sole traders use their PPSN as their TRN, the VAT number is a separate identifier issued upon VAT registration. The VAT number includes the ‘IE’ prefix followed by a unique series of characters.​ 

Why Accurate TIN Validation Matters 

Ensuring the accuracy of your TIN is critical for both businesses and individuals in Ireland. An incorrect or unverified TIN can lead to serious complications such as: 

• Delays in tax processing 

• Rejection of tax exemption claims 

• Fines and penalties for non-compliance 

• Rejection of e-invoicing submissions 

• Onboarding unqualified suppliers or customers 

• Data quality issues across finance and compliance systems 

Using the Ireland Revenue’s myAccount portal or TaxDo real-time global tax ID verification platform ensures accurate Tax ID validation, error reduction, and full compliance with Ireland tax laws. 

Stay Compliant with TaxDo 

While the Revenue’s myAccount portal offers a basic PIN checker, TaxDo takes Ireland TIN validation to the next level with real-time results, periodic revalidation for ongoing compliance, and seamless integration into your systems. 

With TaxDo, you can automate Tax ID validation, monitor changes, and ensure continuous compliance, all from a single, user-friendly dashboard or through API connectivity. 

TaxDo is trusted by leading enterprises, platforms, and compliance teams worldwide. Try it now and eliminate the risks of Tax ID errors in Ireland and beyond.