VAT registration number
Ireland VAT number format
Ireland VAT numbers (VAT) are written as IE + 7 digits + 1 or 2 letters (old format: digit, letter, 5 digits, letter), for example IE6433435F.
- Country code
- IE
- Format
- IE + 7 digits + 1 or 2 letters (old format: digit, letter, 5 digits, letter)
- Example
- IE6433435F
- Local name
- VAT registration number
- Register
- VIES (EU)
- Standard VAT rate
- 23%
Regular expression
^IE(\d{7}[A-W][A-IW]?|\d[A-Z+*]\d{5}[A-W])$Checks the format only. The validator below also checks the check digit.
Check an Ireland VAT number
Include the country prefix. EU numbers are checked against VIES in real time, UK numbers with a separate live check.
How Ireland VAT numbers are built
IE followed by 7 digits and one or two letters. Older numbers have a digit, a letter (or + or *), 5 digits and a letter.
Check digit
The first letter is a modulo-23 check character over the digits (and the second letter, if there is one). The validator checks both formats.
Common mistakes
- The second letter of newer numbers is part of the number: leaving it out fails the check.
Is the number registered?
A valid format and check digit only mean the number could exist. Whether it is currently registered for VAT is known to the Revenue Commissioners, and VIES asks that register for you. Where Ireland shares them, VIES also returns the registered name and address.
Check an Ireland number with the validator above, in the VAT number checker, or up to 50 at once with the bulk VAT validator.
Check Ireland VAT numbers by API
curl "https://api.vatcheckapi.com/v2/check?vat_number=IE6433435F" -H "apikey: YOUR-API-KEY"The response says whether the format and checksum are valid and whether the number is registered, with name and address where Ireland provides them.
Frequently asked questions
What does an Ireland VAT number look like?
How do I check an Ireland VAT number?
Do Ireland VAT numbers have a check digit?
What is the most common mistake with Ireland VAT numbers?
What is the VAT rate in Ireland?
Other countries
VAT validation API
Validate VAT numbers in your app
vatcheckapi checks the format and checksum of EU and UK VAT numbers and confirms the registration live (VIES for EU numbers), with company name and address where the country provides them.
/v2/check documentation VAT number API All documentation
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GET https://api.vatcheckapi.com/v2/check?vat_number=LU26375245
{
"country_code": "LU",
"vat_number": "26375245",
"format_valid": true,
"checksum_valid": true,
"registration_info": {
"is_registered": true,
"name": "AMAZON EUROPE CORE S.A R.L.",
"address": "38, AVENUE JOHN F. KENNEDY\nL-1855 LUXEMBOURG",
"address_parts": null,
"checked_at": "2026-10-16T09:12:44.000000Z"
},
"registration_info_history": []
}