How to check a VAT number in Ireland
If you trade B2B with Irish suppliers or customers, you will see an Irish VAT number on invoices and contracts. Before you approve payment, apply zero-rated VAT, or add a partner to your books, you should know how to check a VAT number in Ireland against the official registry — free, online, and in seconds.
What does an Irish VAT number look like?
Irish VAT numbers start with the prefix IE followed by seven digits and one or two letters — for example IE6388047V or IE1234567WA. Some legacy formats place a letter in the second position. The number should appear on tax invoices and Revenue correspondence. If the format looks wrong or the IE prefix is missing, run an IE VAT number format check before you rely on it. Full EU prefix rules are in our guide to EU VAT numbers explained.
How Irish VAT validation works
Ireland is an EU member state, so Irish VAT validation runs through the European Commission's VIES system — not HMRC. When you submit an IE number, VIES routes the query to Revenue's registry and returns whether the registration is currently valid, plus the registered business name and address where Revenue provides them.
Enter the full number including the IE prefix on our free VAT checker for instant VIES results — no account required. For a broader look at the lookup process, read how VAT validation works.
Step-by-step: check an Irish VAT number online
To check a VAT number in Ireland online, copy the full IE number from the invoice, remove spaces, and enter it into a VIES-connected tool that queries Revenue live. Review the result: valid or invalid, plus the registered company name and address on file. See why you should verify VAT numbers before every B2B transaction.
What a Revenue VAT check returns
A successful verify IE VAT number lookup returns valid status and, in most cases, the registered business name and address Revenue holds on file. Compare those details to your supplier or customer — not to an email signature alone. If the name does not match the invoice, contact the business before releasing funds. Revenue may not always return an address for every lookup, depending on what VIES receives from the national database.
Ireland vs UK VAT checks
Irish numbers use VIES; UK GB numbers use HMRC since Brexit. If you trade with both markets, keep both workflows. For GB checks, read check VAT number in UK or UK VAT numbers. For other EU member states, see best free website for checking EU VAT IDs.
When to check an Irish VAT number
Build an Irish VAT number check into supplier onboarding, accounts payable, and customer verification before zero-rating cross-border B2B supplies. General tips are in our FAQ and how to check VAT registration number.
Check an Irish VAT number free now
Whether you need to validate an Irish VAT number free for one invoice or build a regular compliance workflow, the process takes seconds. Visit the Check VAT Number homepage, enter the full IE number, and get instant VIES results — or browse more guides on our blog.