VAT registration is not company registration
An Irish company number identifies an incorporated entity on the company register. A VAT number relates to tax registration and, in the VIES context, intra-EU trade. One should not be substituted for the other because a supplier may be incorporated without the relevant VIES status, or may trade under a name that differs from its legal company name.
Start by separating every identifier in the onboarding record. This prevents staff from typing a VAT number into a company-number field or treating a trading brand as the contracting party.
- Company registration number identifies the legal entity.
- VAT validation addresses a tax-registration question.
- A trading name may belong to a company, partnership or individual.
- Bank details require their own verification control.
How to interpret a VIES response
The European Commission describes VIES as a search engine that retrieves information from national VAT databases. A valid response confirms relevant EU VAT information at that time. An invalid response may mean the number does not exist, is not activated for intra-EU transactions or is not yet finalised.
Temporary service availability and registration timing can affect results. Preserve the consultation evidence and ask the supplier to resolve an invalid or inconsistent response through the appropriate tax channel rather than inventing an explanation yourself.
Match tax evidence to the supplier company
After validation, search the Irish company and compare the legal name, address, status and company type with the contract and invoice. Where a group uses one entity to sell and another to collect funds, require a clear documented explanation and correct contractual paperwork.
Order the full report for material suppliers or credit exposure. Directors and filing history help establish a dated corporate baseline, while the VIES record supports the tax check. Neither confirms the bank account, so independently verify payment instructions.
- Use exact names, not approximate brand matches.
- Document group-company or branch relationships.
- Recheck when invoice identity or bank details change.
- Escalate unresolved mismatches before tax or payment approval.
Build a repeatable VAT and company control
A strong onboarding form has separate fields for legal name, company number, VAT number, trading name and beneficiary. Require a reviewer to confirm each against its appropriate source, then time-stamp the outcome.
For ongoing suppliers, repeat the identity check after material changes and periodically according to risk. The objective is not only tax accuracy: it also reduces duplicate suppliers, misdirected payments and contracts signed with the wrong entity.