The 31 largest Accounting companies in Ireland (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	KPMG Ireland kpmg.ie A leading provider of audit, tax, and advisory services for domestic and international clients across all sectors, specializing in driving value and navigating change	Accounting	🇮🇪 Dublin	2,978	n/a
2	My Office myoffice.ie Providing affordable bookkeeping and administration services for businesses, helping them be more efficient and save time and money	Accounting	🇮🇪 Ennis	748	n/a
3	Forvis Mazars In Ireland forvismazars.com provides audit, tax, consulting, financial advisory, corporate finance, and outsourcing services to international corporates, SMEs, financial institutions, and public bodies	Accounting	🇮🇪	739	n/a
4	BDO Ireland bdo.ie BDO Ireland offers personalized services with a human touch, providing practical solutions with intelligence, empathy, and purpose through a global network	Accounting	🇮🇪 Dublin	527	1982
5	Chartered Accountants Ireland charteredaccountants.ie Largest and longest established accountancy body in Ireland, representing over 31,000 members and 7,000 students, and leading voice of the profession	Accounting	🇮🇪 Dublin 2	399	1888
6	Office of the Comptroller and Auditor General, IRELAND audit.gov.ie The company conducts financial audits, assesses value for money and financial management practices, and ensures funds are used appropriately in public organizations	Accounting	🇮🇪 Dublin	311	1923
7	Xeinadin Ireland xeinadin.ie Leading professional firm in Ireland providing market leading business and personal financial solutions through a dedicated team focused on quality, excellence, and innovation	Accounting	🇮🇪 Dublin	298	2019
8	RSM Ireland rsmireland.ie A leading firm in audit, tax, and consulting services with over 200 staff and 3 offices in Ireland Recognized for excellence	Accounting	🇮🇪 Dublin	261	n/a
9	OSK osk.ie Professional business advisor offering audit, accounting, tax, payroll, and advisory services to owner-managed businesses, SMEs, multinational groups, government bodies, and contractors since 1985	Accounting	🇮🇪 Dublin	208	1985
10	Crowe Ireland crowe.com A leading Chartered Accountancy and Business Advisory practice in Ireland, providing audit, tax, wealth management, and advisory services to a wide range of clients	Accounting	🇮🇪 Dublin	196	1941
11	Contracting PLUS contractingplus.com Specializing in accounting and tax advice for contractors and solo-self employed professionals, offering compliant payment solutions, expert advice, and industry-specific services with a personal touch	Accounting	🇮🇪 Dublin	181	2002
12	FPM fpmaab.com Leading business advisers providing comprehensive financial support to local SMEs, private clients, and national/international businesses across Ireland, UK, and Scotland	Accounting	🇮🇪 Ireland	149	1991
13	FRAME (formerly BKK)frame.international A financial advisory firm with over 40 years of experience providing expert advice and strategic support to businesses across various industries	Accounting	🇮🇪 Cork	73	1977
14	O'Neill Foley onf.ie A leading business advisory and chartered accountancy firm in the South East of Ireland, offering expert services to clients locally and internationally	Accounting	🇮🇪 Kilkenny	59	1958
15	BFCD bfcd.ie BFCD is a go-to accountancy and advisory firm in Dublin, offering tailored financial services to owner-operated businesses with a global reach	Accounting	🇮🇪 Dublin	55	1988
16	Cooney Carey cooneycarey.ie A leading advisory firm providing auditing, taxation, company secretarial, and business advisory services with over 25 years of experience	Accounting	🇮🇪 Sandyford	47	1983
17	DHKN (Merged with Moore Ireland)mooreireland.ie Leading provider of Accounting, Taxation, Auditing, Outsourced Accounting, Business Advice, Corporate Governance, Compliance, and Corporate Finance solutions in Ireland	Accounting	🇮🇪 Galway	40	2003
18	O'Connor Pyne & Co. Limited oconnorpyne.ie A dynamic firm of Chartered Accountants in Cork, providing specialized technical advice, business advisory services, and a range of financial solutions	Accounting	🇮🇪 Ballincollig	39	2003
19	Leonard & Company leonardco.ie A multidisciplinary professional services accountancy practice in South Dublin providing audit, financial, taxation, and business advisory services to clients	Accounting	🇮🇪 Rathfarnham	32	1948
20	HSOC Chartered Accountants hsoc.ie HSOC offers tailored accounting and taxation services with 40 years of experience, international expertise, and specialized advice for businesses and individuals	Accounting	🇮🇪 Dun Laoghaire	29	1971
21	ECOVIS Ireland ecovisdca.ie A team of Chartered Accountants and Business Advisors in Dublin offering financial advice, taxation services, audit services, and business support to SMEs in Ireland	Accounting	🇮🇪 Upper Mount Street	27	n/a
22	MCN Associates mcnassociates.ie Provider of accountancy, taxation, and financial services to personal and corporate clients globally, with a focus on cost-effective and supportive client development	Accounting	🇮🇪 Dublin 2	19	n/a
23	Purcell McQuillan Tax Partners pmqtax.com Leading Irish tax advisory firm with highly experienced consultants providing expert advice on all tax matters for a range of clients	Accounting	🇮🇪 Dublin	18	2001
24	Leahy O'Riordan Chartered Accountants Limited hlb.ie Established in 1986, this Dublin-based firm offers a wide range of accountancy, tax services, and financial advice to owner-managed businesses	Accounting	🇮🇪 Dublin	16	1986
25	AMQ Accountants & Auditors ("AMQ")amq.ie A multidisciplinary firm offering accounting, auditing, business consulting, cloud accounting, management reporting, internal control, corporate governance, and corporate turnaround services	Accounting	🇮🇪 Ennis	14	2010
26	NKC Business & Taxations Consultants Ltd nkc.ie A client-focused accounting firm providing comprehensive services to drive business success through practical solutions and close relationships since 1998	Accounting	🇮🇪 Dublin	12	1998
27	Paul O'Donovan & Associates Chartered Accountants and Registered Auditors paulodonovan.ie A progressive Accountancy Practice in Cork offering a comprehensive range of services including accounting, audit, taxation, business start-up, and payroll	Accounting	🇮🇪 Cork	11	1993
28	Xeinadin (previously O'Rourke & Co. Chartered Accountants)xeinadin.ie A firm of Chartered Accountants and Xero Certified Advisers offering real-time cloud accounting, sound business advice, and services to clients worldwide	Accounting	🇮🇪 Killarney	10	2019
29	Dermot O'Malley & Co.bmca.ie We are a team of registered accountants and auditors offering a full range of services including audit, tax, advisory, and business outsourcing for individuals and businesses	Accounting	🇮🇪 Dublin	9	1986
30	James Byrne & Company forvismazars.com A reputable accounting and taxation firm in Cork and Waterford offering practical solutions for businesses across various industries	Accounting	🇮🇪 Mallow	8	1978
31	Mulcahy Gorman Mulcahy mulcahygormanmulcahy.com Established independent audit and accountancy practice in Limerick offering a wide range of services to local and international businesses with a large team of experts	Accounting	🇮🇪 Limerick	8	1972

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 9, 2026.

The 31 largest Accounting companies in Ireland

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