Separate incorporation from tax registration
The CRO number identifies the registered company. Revenue issues the tax reference through its separate registration process, and VAT registration needs its own consideration. Store each official confirmation under the right heading. Do not use the incorporation certificate as evidence that all possible taxes have already been registered.
Create an identifier register
Record the legal name, CRO number, Revenue reference, confirmed tax registrations, relevant dates and where the supporting notices are stored. Restrict access appropriately: not every staff member needs the complete tax file. A person preparing a supplier form usually needs an approved answer for that form, not unrestricted access to every official record.
Answer the question actually being asked
A bank may ask for incorporation information while a customer asks whether you are VAT-registered. Read the field label rather than copying the first number available. If a form’s wording is unclear, ask the recipient what it needs. For example, “business registration number” can be ambiguous in an international supplier questionnaire; explain the jurisdiction and identifier type.
Control invoice and website changes
Before putting a VAT identifier on invoices or website material, have the accountant confirm the registration and the appropriate billing treatment. Record who approved the change and its effective date. Keep older templates out of the routine workflow to avoid inconsistent documents. The register is a coordination tool; it should reflect official notices rather than assumptions made during formation.
Your practical checklist
- Record each identifier with its issuing authority
- Keep official registration notices available
- Confirm VAT status before changing invoices
- Clarify ambiguous international forms
- Review templates when registrations change
Sources and editorial notes
Official guidance and any referenced service information checked 11 October 2026. These are original preparation notes with illustrative examples; they do not replace individual legal or tax advice.
- Revenue: registering a new company for tax
- CRO: using registration services
- Revenue: who should register for VAT
Author and publisher: Ireland Company Formation, operated by COMMERCIAL ADMINISTRATION BUREAU LIMITED. For a correction or question, contact the team.
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