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 and 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.

Cross Border Practices
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.
Belfast Offices
Newry Offices
Dundalk Offices
With offices in Dundalk, Belfast and Newry, our client nucleus encompasses the Greater Newry and Belfast regions, Counties Down, Armagh, Louth and Monaghan but our experience draws clients from across Ireland and the UK.
Why Work With Us?
Providing for your business for almost 40 years…
At John MacMahon & Co we are not limited to any specific software package and work with all the industry leaders in this field. We cater for all types and sizes of business’ North & South of the border and are proud to have Chartered status and a registered Auditor.