Best Accounting Firms in Ireland (2026): 6 Firms Reviewed

A foreign company with an Irish subsidiary needs local bookkeeping, payroll, VAT returns, a corporation tax return, an annual return with financial statements filed at the Companies Registration Office (CRO) and often a statutory audit. This ranking is written for a company from the US, the UK, another EU country or the Nordics that is looking for accounting firms in Ireland to take that work on. I kept 6 firms, all registered and headquartered in Ireland, and looked each one up by its registration number.

Accounting firms in Ireland at a glance

If you only have a minute, these are the accounting firms in Ireland I would shortlist as a foreign company, in the order I would contact them. Each is reviewed below, with its registry data on its company profile.

1. Duignan Carthy O’Neill – Partner-led Dublin audit and tax firm, PCAOB-registered, for multinationals setting up in Ireland.
2. Crowleys DFK – Mid-size Dublin and Cork practice that lists foreign direct investment as its first sector.
3. RBK – Large Irish independent firm with international tax, transfer pricing and global-mobility teams.
4. Fitzgerald Power – South-east Irish accountancy and advisory firm with outsourced CFO services.
5. ifac – Member-owned co-operative accountancy firm for farming, food and agribusiness.
6. Gilroy Gannon – North-west Irish audit, tax, forensic and insolvency practice since 1971.

How I ranked the accounting firms in Ireland

I ranked the accounting firms in Ireland by quality first, fit for a foreign client second and price third:

• Foreign-client fit – work for multinationals and foreign direct investment, international tax, and audit of subsidiaries of foreign groups. DCON’s PCAOB registration counts for US groups.
• Breadth – audit, tax, payroll and outsourced accounting under one roof.
• Network ties – three firms belong to associations of independent firms: DCON (AGN International), Crowleys DFK (DFK International) and RBK (LEA Global and BOKS). I kept them because they are independent Irish firms that work under their own names, and I disclose the membership. ifac is a member-owned co-operative.
• Reviews – none of the six has a usable Clutch or Google review sample, so for each one I name the strongest other signal.
• Registration – CRO number, legal form and incorporation date come from solocheck.ie, which republishes CRO data; ifac’s numbers come from its own website. Most Irish private companies file abridged accounts, so I quote no revenue.

The list includes only firms registered and headquartered in Ireland. I left out the Irish member firms of global networks that carry the network’s brand, such as the Big Four, Grant Thornton and BDO.

The 6 best accounting firms in Ireland, reviewed

Every accounting firm in Ireland below gets the same treatment: who they are, what the evidence says, the facts that matter when you hire, and my opinion on who should – and should not – work with them.

1. Duignan Carthy O’Neill

Partner-led Dublin audit and tax firm, PCAOB-registered, for multinationals setting up in Ireland

Duignan Carthy O’Neill (DCON) is a partner-led Dublin chartered accountancy and registered audit firm that has been in practice for more than 50 years, now at 3 Harmony Court, Harmony Row, Dublin 2. It advises multinationals setting up Irish operations and companies making acquisitions in Ireland and Europe, and it audits Irish and UK subsidiaries of US public companies under its registration with the PCAOB, the US audit regulator. Its footer says it is authorised by Chartered Accountants Ireland to carry on audit work. It is an independent member of AGN International, an association of independent accounting firms, but works under its own name. The practice now runs through a company incorporated in 2017; older related entities are terminated.

What clients say. I found no usable Clutch or Google review sample. Its PCAOB registration and its work for US-listed groups are the strongest signals.

Facts: Dublin 2 (Harmony Row) · English.

My take: my first call for a US or other foreign group that wants audit, tax and compliance for an Irish subsidiary from an independent firm. Best for: US and other foreign groups that need audit, tax and compliance for an Irish subsidiary from an independent firm. Not for: very large listed groups that need Big Four coverage.

Visit dcon.ie →Company profile & reviews →

2. Crowleys DFK

Mid-size Dublin and Cork practice that lists foreign direct investment as its first sector

Crowleys DFK is an Irish chartered accountancy and advisory firm with offices in the business districts of Dublin (College Green) and Cork; it says 2025 was its 50th year in business. Its services cover accounting, financial advisory and outsourcing, audit and assurance, tax, consulting, corporate finance, and public-sector and aviation advisory. Foreign direct investment is the first sector it lists, alongside SMEs, technology, financial services and charities. It is an independent member firm of DFK International, an association of independent accounting firms, and keeps its own name with a “DFK” suffix.

What clients say. I found no usable Clutch or Google review sample. Half a century in practice and its explicit focus on foreign direct investment are the strongest signals.

Facts: Dublin (College Green) and Cork · English.

My take: the firm I would brief for an Irish subsidiary that wants audit, tax and outsourced accounting from one mid-size firm in Dublin or Cork. Best for: foreign companies setting up an Irish subsidiary that want audit, tax and outsourced accounting from one mid-size firm. Not for: buyers who want a Big Four-scale multinational audit team.

Visit crowleysdfk.ie →Company profile & reviews →

3. RBK

Large Irish independent firm with international tax, transfer pricing and global-mobility teams

RBK is an Irish chartered accountancy firm that has been in practice for more than 65 years, with offices in Dublin, Athlone, Castlebar and Roscommon; its registered office is in Athlone. Its services span audit, corporate and international tax, transfer pricing, VAT, global mobility, outsourced accounting and payroll, corporate finance, restructuring and forensic work. It belongs to the LEA Global and BOKS International alliances of independent firms and to the Mobile Workforce Collaborative, but works under its own name. Audit work may be signed by a separate RBK entity; I did not check which one.

What clients say. I found no usable Clutch or Google review sample. Its in-house international tax, transfer-pricing and global-mobility teams are the strongest signals.

Facts: Athlone, Dublin, Castlebar and Roscommon · English.

My take: a strong choice for a foreign-owned subsidiary that needs tax, payroll and outsourced accounting with cross-border support. Best for: foreign-owned Irish subsidiaries that need tax, payroll and outsourced accounting with cross-border support. Not for: buyers who want a single-office boutique.

Visit rbk.ie →Company profile & reviews →

4. Fitzgerald Power

South-east Irish accountancy and advisory firm with outsourced CFO services

Fitzgerald Power is an accountancy and business advisory firm headquartered at Greyfriars, Waterford, with a Dublin office on Merrion Road; it traces its practice back to the 1980s. Its services include accounting, payroll and bookkeeping, audit, tax advisory, corporate finance for acquisitions and disposals, and outsourced CFO services. Its website mentions no international network. Audit work may be carried out through a separate entity, which I did not check.

What clients say. I found no usable Clutch or Google review sample. Its outsourced CFO offer and a practice going back to the 1980s are the strongest signals.

Facts: Waterford (HQ) and Dublin · English.

My take: the firm I would pick for an SME or small subsidiary that wants payroll, bookkeeping and a part-time finance director from one firm. Best for: SMEs and foreign-owned subsidiaries that want outsourced finance, payroll and tax in Ireland. Not for: large-group audits.

Visit fitzgeraldpower.ie →Company profile & reviews →

5. ifac

Member-owned co-operative accountancy firm for farming, food and agribusiness

ifac – the Irish Farm Accounts Co-operative Society – is a member-owned co-operative accountancy firm with more than 600 people and offices in all four provinces. Besides farm accounting, it serves food and agribusiness companies and SMEs with tax, audit (through ifac Audit Services Limited), payroll and HR, company secretarial, succession and sustainability advice. In June 2026 it co-founded the Pinion Global Network of agriculture-focused advisers. As a co-operative it is registered as an industrial and provident society rather than as a company; the registration number and VAT number below come from its own website, and I did not check them on a register.

What clients say. I found no usable Clutch or Google review sample. Its national office network and its farm, food and agribusiness focus are the strongest signals.

Facts: Kilkenny (registered office), about 30 offices nationwide · 600+ people · English.

My take: the obvious choice for a foreign food or agribusiness investor, or a rural SME, that wants an adviser who knows Irish farming. Best for: foreign food and agribusiness investors and rural SMEs in Ireland. Not for: tech multinationals that need transfer pricing at scale.

Visit ifac.ie →Company profile & reviews →

6. Gilroy Gannon

North-west Irish audit, tax, forensic and insolvency practice since 1971

Gilroy Gannon was established in Sligo in 1971 by Declan Gilroy and Joe Gannon and works from 25 Stephen Street, Sligo. It offers audit and assurance, tax, corporate compliance and governance, corporate finance, business advisory, outsourcing, insolvency and forensic accounting. Related companies include Gilroy Gannon Financial Services and Gilroy Gannon Secretarial Services (North Data). I did not check whether audits are signed by the company or a partnership.

What clients say. I found no usable Clutch or Google review sample. More than 50 years in Sligo and in-house insolvency and forensic work are the strongest signals.

Facts: founded 1971 · Sligo · English.

My take: the firm I would use for a company with operations in the north-west that wants full-service accounting close by. Best for: companies with operations in the north-west that need full-service accounting and insolvency expertise. Not for: buyers who need a Dublin office.

Visit gilroygannon.com →Company profile & reviews →

Quality, specialisation and what accounting firms in Ireland charge

None of the accounting firms in Ireland in this ranking publishes a price list: bookkeeping, payroll, tax and audit are quoted after the firm has seen your company’s size, number of transactions and reporting needs, usually as a fixed annual fee or by the hour, in euros (EUR). A clean, digital bookkeeping set-up on your side keeps the fee down.

The main choice is between Dublin firms that serve multinationals (DCON, Crowleys DFK), a large independent with international tax and mobility teams (RBK), a south-east firm with outsourced CFO work (Fitzgerald Power), a national co-operative for food and agribusiness (ifac) and a north-west practice (Gilroy Gannon).

How to choose an accounting firm in Ireland

Choosing an accounting firm in Ireland starts with what your Irish company has to file and who will sign it:

• Audit or no audit – Irish companies file an annual return with financial statements at the CRO, and many need a statutory audit; small companies can often claim an audit exemption if they meet the conditions, but group companies face extra conditions. Ask the firm whether the exemption applies to you – this is not legal advice.
• Who signs the audit – in several firms here the audit may be signed by a separate entity or partnership. Ask which entity is the registered auditor.
• US parent – if your parent is a US-listed company, ask whether the auditor is registered with the PCAOB; DCON is.
• Tax – Ireland’s 12.5% corporation tax rate on trading income draws many subsidiaries, but large groups are subject to a 15% minimum rate. Transfer pricing, VAT and payroll taxes (PAYE, PRSI and USC) all need care – RBK has dedicated teams.
• Sector – for food and agribusiness, ifac is the specialist.

Also check the paperwork when you hire an accounting firm in Ireland. Look up the CRO number in the CRO’s free company search (CORE, at cro.ie), where you can see the legal form, status, registered office and filed documents, and check that the firm signing your audit appears on the public register of statutory auditors. Check the VAT number (IE followed by digits and one or two letters) in the EU’s VIES database. In most cases the adviser’s fees to a VAT-registered business in another EU country carry no Irish VAT under the reverse charge, while fees to your Irish subsidiary do carry Irish VAT; confirm with your adviser – this is not tax advice. Ireland runs on Irish time, the same as the UK and one hour behind Central European Time. If cost matters more than location, see the same list for Poland, where fees are usually lower; for Britain, see accounting firms in the UK.

Accounting firms in Ireland: FAQ

The questions foreign companies ask most before hiring accounting firms in Ireland.

My verdict: which accounting firm in Ireland to hire

Choosing among accounting firms in Ireland depends on your group and sector. For a subsidiary of a US or other foreign group, hire DCON. For audit, tax and outsourced accounting from one mid-size firm in Dublin or Cork, hire Crowleys DFK. For international tax, transfer pricing and global mobility, hire RBK. For outsourced finance in the south-east, hire Fitzgerald Power. For food and agribusiness, hire ifac; for the north-west, Gilroy Gannon.

Whichever accounting firm in Ireland you choose, agree in writing who prepares the financial statements, which entity signs the audit and when VAT, payroll and the annual return are filed.

Written by Adrian DąbrowieckiSEO consultant and founder of Marketer Coffee in Wrocław. I write every ranking on this site myself. Disclosure: Marketer Coffee is my agency.Last updated 7 Nov 2026Changelog · Nov 2026: first version, 6 firms

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