CRO Annual Return (B1) in Ireland: What Companies Must File

The CRO annual return filing Ireland requires is a yearly obligation on every registered company. According to the Companies Registration Office (CRO), the annual return is made up of Form B1 plus the documents the Companies Act 2014 requires, which for most companies means the financial statements. This guide walks through who must file, the key dates, what to attach, and what the CRO says happens when a company files late.

It is general information from official sources, not legal advice. We quote CRO page dates where they are shown, and we say where they are not.

What the annual return is and who must file

The CRO's page on filing an annual return (modified 19 August 2025, according to the page metadata) says that every company must file an annual return at least once a year, whether it is trading or not. The CRO's Information Leaflet 23 on annual return and financial statement requirements refers to section 342 of the Companies Act 2014 as the basis of the obligation. The leaflet shows no publication date, so check the CRO website for the current version.

Directors have a role in this process. Our overview of directors' duties in Ireland explains the wider compliance picture that sits around filing deadlines.

Annual return date and the filing deadline

The CRO uses the term Annual Return Date (ARD). The return must be made up to a date no later than the company's ARD. Leaflet 23 says the ARD moves forward by one year after each return unless the company changes it.

On the deadline, both CRO pages say the return must be delivered to the CRO not later than 56 days after its effective date (the leaflet phrases this as 56 days after the ARD). The leaflet also says that where a deadline falls on a Saturday, Sunday or public holiday it moves to the next working day. The leaflet's late-fee section uses a different figure of its own, so before you rely on a specific day-count for your company, confirm it against the CRO's current page or ask your accountant or company secretary.

First and second returns

According to the CRO page, the first return is made up to six months after incorporation and does not need financial statements. The leaflet adds that it cannot be filed early. The second return is made up to a date not later than 18 months after incorporation, with financial statements attached, and the CRO page says it must also be filed within 56 days.

What goes with Form B1

The CRO says the financial statements are usually attached and must cover a period ending no more than nine months before the return's effective date. Leaflet 23 sets out further details:

• Financial statements are required with every return except the first six-month return, unless a Form B73 extends the ARD.
• Financial statements must show the typed names of signatories and the signing date. Handwritten signatures are not required.
• A B1 must be signed by a director and a secretary who are different people.
• An electronic filing agent can file and sign the B1 but cannot certify the financial statements, so separate certification is needed.
• Acceptable formats are IFRS or Companies Act financial statements.

The leaflet also says small, micro and dormant companies may claim audit exemption, whereas public limited companies cannot claim any exemption. Shareholders holding at least 10 per cent of voting rights can require an audit by serving notice within the prescribed period. Where audited accounts are filed, the auditor must be on the Public Register of Auditors and the B1 must carry the matching auditor registration number.

Filing electronically

The CRO page says electronic filing has been mandatory since June 2017, through CORE with online payment, and that the requirement covers Form B1, B2 (change of registered office), B10 (change of director or secretary details) and B73 (nomination of a new ARD). The leaflet confirms paper B1s are not accepted. It also says filings may be made through CORE or a secretarial software package.

The CRO page mentions a filing fee and a late filing fee but does not state amounts. Leaflet 23 does state fee amounts, but it carries no date, so we do not repeat them; check the CRO fees page on the day you file.

Changing dates, and extra time

Leaflet 23 says a Form B73 can extend the ARD by up to six months, and advises the company to confirm that the change was registered or it risks late penalties and loss of audit exemption. A Form B83 can alter the financial year-end, generally once every five years, and the result may not exceed 18 months. The first ARD, six months after incorporation, cannot be changed.

A company that needs more time without changing its ARD may apply to the District Court or High Court under section 343, the leaflet says, and if the terms of the court order are met no late penalties or loss of audit exemption apply for the years it covers.

What happens if you file late

The CRO page and Leaflet 23 set out several consequences:

• A late filing fee applies in addition to the normal filing fee.
• The company loses audit exemption for the following two years, so audited financial statements are required in both years.
• Leaflet 23 says a late return can affect the company's compliance history and may result in the company being selected for enforcement action.
• Leaflet 23 describes late filing as a Category 3 offence for the company and every officer in default, and says the Director of Corporate Enforcement may apply to the High Court to disqualify directors.
• The leaflet says one statutory warning is issued to the registered office before involuntary strike-off.

Late uploads of financial statements also matter. The CRO page says that since 1 April 2018, forms missing a valid signature are rejected with no 14-day correction window, and that uploading financial statements late makes the whole return late.

Errors and returned filings

Under the leaflet's description of section 898 of the Companies Act 2014, the CRO may send a notice for a non-compliant filing. If a fully compliant document is delivered within 14 days, it is treated as delivered on the original date; otherwise the original is treated as not delivered, which usually leads to late penalties. The leaflet lists common errors: late filing, a "made up to" date later than the ARD, financial statements predating the return by more than nine months, missing typed signatures, unregistered directors or secretaries, and missing exemption statements on the balance sheet.

A practical filing calendar

These are our suggestions, not requirements:

• Diarise the ARD and the deadline at the start of the year, and agree internal deadlines for draft accounts well ahead of it.
• Check that director and secretary details on the CRO register are current before you file.
• Agree who signs and certifies the financial statements, and who files the B1.
• Keep a copy of the filing receipt.

Finance staff who file or review returns may want to keep their wider skills current; see our overview of CPD training for finance professionals in Dublin.

Learnsignal's offices are off Baggot Street in Dublin, and we offer in-person training from there. For current details, see our CPD pages.

Frequently asked questions

Do dormant companies have to file an annual return?

The CRO page says every company must file, whether trading or not.

What is the deadline for filing?

Both CRO pages we opened state 56 days, measured from the return's effective date or the ARD. Confirm the day-count and any weekend or holiday shift against the current CRO guidance.

What is the cost of filing late?

The CRO page says a late fee applies and the company loses audit exemption for the following two years. The page does not state fee amounts.

Can paper forms still be used?

No. The CRO says electronic filing has been mandatory since June 2017.

Always check the CRO's current pages before you file.