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" I have hired Costelloe and Co over
10 years for various companies and organizations I have managed. Costelloe and Co have always met or exceeded the high standards I requested."
George Kennedy

" Costelloe & Co have prepared financial statements and management accounts for my company and I have found them to be very professional and a pleasure to work with..."
Billy Sheahan

" I have engaged Costelloe & Co services over many years and they have always given an excellent service."
Noel Cunningham

  At Costelloe & Co we pride ourselves on offering excellent customer care.


  We use technology, knowledge, experience of accounting and taxation to deliver world class service to our clients.

  All work is carried out by experienced professionally qualified accountants with up to date knowledge of accounting principles and taxation law & using the latest computer technology and software.

  Costelloe & Co can process information speedily, effectively and provide excellent value for money and so add value to your business.

  We adhere to high professional standards and have excellent communication skills. We can explain business, accounting and taxation issues in plain language and give you an understanding of how you can minimise your tax bill.

We can do your tax, v.a.t. and c.r.o. returns, payroll, and also prepare strategic and business plans and provide consultancy services if you so require.

We are believers in lifelong learning and are constantly updating and reviewing business issues and increasing our knowledge base, business, and information technology and communication skills.

  We are innovative and think strategically yet down to earth and practical. We have helped many companies grow and prosper and have also rescued companies that were in deep trouble.

  We can meet you at your office to minimize hassle or you can visit us at our offices, whichever suits you best.

  We have the drive, focus, determination, energy, practical knowledge and business savvy to improve your organizations business performance. Whether your company needs to cut costs and downsize or grow and develop we have the experience and skills to help your business.

  The principal partner Sean Costelloe has over 20 years experience as an accountant, business adviser and consultant to large multi-national companies and indigenous SMEs.

  We are constantly scanning the business environment at Irish, European and Global level and are cognizant of the ever changing role of the accountancy profession.

  Modern accountants can no longer be long tunnel technocrats they need broad business skills and the ability to communicate effectively as well as a keen understanding of accounting and taxation issues.

  We can put in place management accounting reporting systems that focus on the key performance areas that are needed to drive companies to achieve world class standards.

  • Accounting and Taxes
  • Reduce Tax Bills
  • Reduce Business Costs
  • Business Mentoring
  • Strategic Planning
  • Market Research
  • Management Consulting
  • Business Planning
  • SAGE Training
Cok Accountant

  Sean Costelloe is an experienced professional Accountant and Business Mentor with broad experience in all aspects of accounting, consulting and financial management.

Sean Costelloe is a

  •  Fellow of the Chartered Institute of      Management Accountants (FCMA)
  •  Registered Tax adviser
  •  CIMA - Member in Practice.
  •  Enterprise Ireland approved Business      Mentor
  •  An accountant, business mentor,      management consultant with
     over 20 years experience


  Sean Costelloe has also consulted on business strategy at senior management (including board level) for many multi national and indigenous Irish companies e.g.

  •  GlaxoSmithKline
  •  Hitachi
  •  Bausch & Lomb
  •  Hasbro
  •  plus many other multi National Plcs
     and approx 80 indigenous Irish companies
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