Accounting Solutions for almost 30 Years

Established in 1978 O’Brien Coffey MacSweeny is a professional services accountancy firm based in Killarney. We are licensed to operate under the regulations of the Institute of Certified Public Accountants Ireland and Irish Tax Institute.

Our clients comprise both individuals and corporate entities. They range in size from entrepreneurial growth businesses to established companies with turnover in the tens of millions. Our clientele operate at a local, national & international level across a diverse variety of sectors, including hospitality, technology, farming, manufacturing, construction and medical professions.

Our partners have a strong variety of experience working in each sector & are happy to share their big firm experience, knowledge & connections at a local level. O’Brien Coffey MacSweeny aim to drive & develop the local community at every stage from managing your accounts to helping create local jobs. We understand that individual successes at a local level have beneficial implications for the wider community & we strive to develop this domino effect with each our clients for the benefit of all. Additionally we are heavily involved with local charities such as The Ring of Kerry Cycle & the IHCPT Charity.


O’Brien Coffey MacSweeny understand that individual successes at a local level have beneficial implications for the wider community and they strive to develop this domino effect with each client for the benefit of all.

Management Team


Timothy O Brien CPA

Timothy has more than 30 years’ experience He began his career with Cooper & Lybrand (later Pricewaterhouse Coopers). He is responsible for providing audit, taxation, accounting and business advisory services.

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James O Brien ACA AITA QFA

James joined the practice in 2010 from top tier firm Moore Stephens Nathans where he acquired a broad base of experience working in both audit and personal tax departments before heading up their Business Compliance Unit. James is a qualified Chartered Accountant (ACA), Chartered Tax Advisor (CTA) and Qualified Financial Advisor (QFA). He has experience in dealing with clients from a multitude of different industries including businesses in the hospitality, retail and construction sectors as well as acting on behalf of a number of charities and sporting bodies. James has a strong commercial sense and a clear understanding of the challenges facing businesses. His hands on approach and commitment to delivering a quality service ensures effective solutions are provided to his clients to overcome challenges encountered and take advantage of opportunities arising.

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Patrick Mac Sweeny ACA QFA

Patrick trained with Grant Thornton in Dublin and qualified as a Chartered Accountant in 2008. He has gained vast experience with multinationals along with small to medium sized businesses. He specialises in accounting, taxation, start ups and restructuring

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What Makes Us Different ?

As a client of O’Brien Coffey MacSweeny you will benefit from a number of significant advantages our accounting firm has to offer;

correct Our partners take a personal interest in your business, every client of ours gets the full attention of one of our partners and
you will never be referred inappropriately to junior staff.
correct We are extremely accommodating and flexible and if required we can arrange meetings and advice out of business hours.
correct Whether you are a new or expanding company, a sole trader, a partnership or a personal client requiring tax advice we
offer the highest level of service in the business. Our high service levels are based on the importance we place on technical accounting skills, confidentiality, professional independence and our personal commitment to your success.
correct We believe that every client is important, regardless of size. As a client of ours, you can always expect prompt personal attention.
As a client, you will receive a balanced and practical view of your financial affairs along with professional advice
and guidance to help you achieve your individual or corporate goals.

Some of our Business Partners