The Companies Registration Office is the statutory body in Ireland responsible for incorporating companies, registering business names, and maintaining the public register of Irish companies. Every Irish limited company has ongoing obligations to the CRO throughout its life — from the moment of incorporation until it is formally dissolved.
These obligations fall primarily on the company’s directors — and as we outline in our director’s duties checklist, the personal responsibilities that come with the role extend well beyond CRO filings. They are not optional and they do not go away simply because the company is dormant or has stopped trading. A company that exists on the CRO register has filing obligations, and the directors of that company are personally responsible for ensuring those obligations are met.
This article gives a complete guide to what Irish company directors are required to file with the CRO, when, and in what form.
Incorporation Documents
When a company is incorporated, the following documents are filed with the CRO as part of the incorporation process:
Constitution. The company’s constitution (previously called the Memorandum and Articles of Association) sets out the company’s name, its objects, the liability of its members, and its internal governance rules. The constitution is a founding document — it governs the relationship between the company and its members, and between the directors and the shareholders. It should be reviewed at incorporation to ensure it is appropriate for the business, not simply accepted as a standard template.
Form A1. This is the application for incorporation, containing the details of the company’s name, registered office, directors, secretary, shareholders, and share capital. It is signed by the first directors and secretary.
Once incorporated, the company’s details are available on the public register at core.cro.ie.
The Registered Office
Every Irish company must have a registered office in Ireland. The registered office is the address to which official correspondence — including notices from the CRO, Revenue, and the courts — is sent. It must be a physical address (not a PO box) where service of documents can be effected.
If the registered office changes, a Form B2 must be filed with the CRO within 14 days of the change.
For many small businesses, the registered office is the accountant’s or solicitor’s address. If you change professional advisors, ensure the registered office is updated — failing to do so means official correspondence goes to an address you are no longer monitoring.
The Annual Return — B1
As I have covered in detail in my dedicated article on annual return deadlines and the consequences of missing them, the B1 is the most important periodic filing obligation for Irish companies. It must be filed each year, accompanied by financial statements, by the company’s annual return date.
The B1 confirms and updates the company’s registered particulars as at the return date:
Registered office address. Director details (name, address, date of birth, other directorships). Company secretary details. Shareholder details and share capital. Any changes in the company’s structure since the last return.
The B1 is signed by a director and the secretary (or by two directors where there is no separate secretary). It is filed through the CRO online portal at core.cro.ie.
The financial statements accompanying the B1 must cover the company’s most recent financial year end. For a company with audit exemption, abridged unaudited accounts are filed. For companies that must have an audit, full audited accounts are required.
Changes to Directors and Secretary — B10
Whenever a director or secretary is appointed or resigns, the CRO must be notified within 14 days using a Form B10. This applies to:
New director appointments. Director resignations or removals. New secretary appointments. Secretary resignations.
The 14-day window is strict. Late notification is technically an offence, though in practice the CRO generally accepts late filings without sanction unless the delay is significant.
For small companies where the founder is also the sole director, this filing is only triggered if a new director joins or the founder steps down. For companies with a board that changes periodically, the B10 obligation arises more frequently.
Changes to the Constitution — Form G1 / Special Resolution
If the company’s constitution is amended — for example, to change the company’s name, alter its objects, modify share capital provisions, or update governance rules — the change must be supported by a special resolution of the shareholders and filed with the CRO.
A special resolution requires 75% of votes in favour. The special resolution, together with the amended constitution (or the specific amendment), must be filed with the CRO within 15 days of being passed.
Change of Company Name — Form B1 / Special Resolution
A company can change its name by special resolution. The new name must be available — checked on the CRO website — and must not be identical or confusingly similar to an existing registered name. The special resolution and the application for name change are filed with the CRO. If approved, a new certificate of incorporation is issued in the new name.
Allotment of New Shares — Form B5
When a company allots new shares — issues shares to a new or existing shareholder — a Form B5 (return of allotments) must be filed with the CRO within one month of the allotment. This is commonly required when a business takes on a new investor, when shares are transferred as part of a management incentive arrangement, or when a business owner wishes to reorganise the shareholding structure.
Mortgages and Charges — Form C1
When a company creates a fixed or floating charge over its assets — typically as security for a bank loan — the charge must be registered with the CRO within 21 days of its creation. Failure to register a charge in time means it is void as against a liquidator and unsecured creditors — a significant commercial consequence.
Form C1 is filed by the company or the creditor holding the charge. Most banks and solicitors handle this as part of the loan documentation process, but the director should be aware of the requirement and confirm that registration has occurred.
Voluntary Dissolution — Voluntary Strike-Off
When a company is no longer needed and has no outstanding liabilities, it can apply to the CRO to be struck off the register voluntarily. The procedure involves filing a Form H15 and meeting certain conditions — including that the company has no outstanding liabilities and has filed all annual returns up to the point of application.
Voluntary strike-off is preferable to simply abandoning a company. An abandoned company remains on the register, incurring annual return obligations indefinitely, until the CRO pursues an involuntary strike-off.
Keeping Your CRO Information Current
The practical implication of all of these requirements is straightforward: directors need to ensure their company’s CRO record is accurate and up to date at all times. This means:
Filing B10 notifications within 14 days of any change to directors or secretary. Updating the registered office address promptly when it changes. Keeping the annual return date in the calendar and filing the B1 on time, every year. Ensuring that any changes to share capital, company name, or constitution are promptly filed.
For most small companies with a stable structure, the main ongoing obligation is the annual B1. But the other filings matter, and the consequences of missing them — late filing fees, voided charges, incorrect public records — can range from inconvenient to seriously damaging. You can find more practical guidance on staying compliant in our accounting and compliance guides.
Paddy Malone FCA AITI
Paddy is the principal of Malone & Co. Chartered Accountants in Dundalk. A Fellow of Chartered Accountants Ireland and a Chartered Tax Consultant with the Irish Tax Institute, he has been advising businesses across County Louth and the North-East for over 35 years.