John MacMahon & Co. Chartered Accountants is a cross-border practice which was established in 1982.

Today we have offices in Dundalk, Belfast and Newry and employ over 30 qualified staff to service clients on an all-Ireland basis.

John MacMahon & Co is a service-orientated firm with a strong client base in South Down, South Armagh, North Louth and Monaghan offering particular expertise in cross-border tax issues. We are committed to providing a service uniquely tailored to your business’ needs – developing and advising on an individual basis.

Our practice provides a range of accountancy services, incorporating specialist taxation services, to a broad client base which includes the construction, transport, agriculture, leisure, retail and food service sectors.

John MacMahon & Co. has extensive experience in nurturing small to medium sized family-owned businesses and is committed to developing and advising on the growth of each business on an individual basis.

How It Works

  • Enjoy a personal and professional approach to service
  • Stay informed of any changes affecting your business through our timely and regular updates
  • Regular seminars for clients if regulations or laws change to explain how it may affect or improve the way you do business

We can take up the role of consultant or become your business’ financial director– letting you get on with the day-to-day running of your business, safe in the knowledge that we’ll always look at the bigger picture, considering your entire business and its practices when dealing with accountancy issues.

We’re Waiting To Help You

Get in touch with us today and we can guide you through how we can help you and your business!

Accounting & Audit

Providing services to deal with the whole spectrum of accounting issues and help you step-by-step through the necessary auditing process to help improve and enhance your business activities.

Tax Planning & Compliance

The firm delivers extensive expertise in all aspects of taxation, particularly in cross-border taxation issues and can provide consultancy and tax planning capability – normally not available outside the large city-centre practices.

Business Advisory

Our clients enjoy a personal, professional approach to service and we work closely with you to provide a consultancy service tailored to your individual business needs.

Get In Touch

Accountancy &
Taxation Specialists

Providing Cross Border Expertise Since 1982, with offices in Belfast, Newry and Dundalk. Our Cross Border Practice deals with Tax and Compliance Regimes in the UK and ROI, dealing with client business of all sizes from local to global with a specialism in Family Business and Start-Ups. We have deep industry expertise across all the main sectors on the Island of Ireland.

Contact Us today.