Business Details
44 Years
experience
Trusted Chartered Accountants in Belfast, Newry & Dundalk
Established in 1982, John MacMahon is a chartered accountancy practice with offices in Belfast, Newry, and Dundalk. Our team of over 30 qualified professionals specialises in cross-border tax and compliance regimes across the UK and Republic of Ireland, serving businesses of all sizes from local family-run enterprises to international corporations. With deep expertise in sectors including construction, agriculture, retail, and food services, we provide tailored accountancy, audit, and business advisory services designed to meet individual client needs. Our commitment to personal service is complemented by technical excellence in cross-border taxation, forensic accounting, and grant funding support. We maintain strong relationships with clients across Ireland and the UK, offering strategic financial guidance grounded in decades of regional industry knowledge.Our practice combines the accessibility of a local firm with the capabilities typically associated with larger city-centre practices, ensuring clients receive comprehensive, specialist support. We actively engage in client education through regular updates and seminars on regulatory changes affecting business operations. Our audit team holds specialist experience in engineering, textiles, and food processing industries, with registration details publicly available on the Audit Register UK. By focusing on long-term client partnerships, we deliver financial solutions that align with both immediate requirements and future growth objectives.
Services
Accountancy & Audit
Tax Planning & Compliance
Business Advisory
Forensic Accounting
Grant Applications
Details
- Year established: 1982
Highlights and features
- We offer 40 years of cross-border tax expertise since 1982
- Our team includes specialists in UK and ROI compliance regimes
- We provide tailored business advisory services for family-owned enterprises
- Our audit practice holds specialist experience in key industry sectors
- We maintain a proven track record in successful grant funding applications
Associations and certifications
- Institute of Chartered Accountants in Ireland
- Audit Register UK
What people say
Cross-border tax expertise
Responsive team
Practical business solutions
Specialist sector knowledge
Long-term support
Services
Accountancy & Audit
We provide comprehensive accountancy and audit services for businesses across multiple sectors. Our team assists with statutory accounts preparation, company secretarial duties, and corporate governance requirements. With specialist knowledge in engineering, textiles, and food processing industries, we guide clients through the audit process while identifying opportunities for business improvement. Our audit registration (reference 222919) enables us to operate across both UK and Republic of Ireland jurisdictions.
Tax Planning & Compliance
Our tax specialists deliver strategic planning and compliance solutions for personal and corporate clients. Focusing on UK-ROI cross-border issues, we handle self-assessment returns, corporation tax, VAT, and inheritance tax planning. We represent clients during tax investigations and voluntary disclosures, with expertise in complex cross-jurisdictional tax matters typically found only in major city practices. Regular client updates ensure awareness of regulatory changes affecting tax positions.
Business Advisory
We offer tailored business advisory services covering financial restructuring, succession planning, and merger/acquisition support. Our team prepares business plans for funding applications and conducts due diligence investigations. With particular strength in family business advisory, we provide ongoing strategic guidance that considers both operational requirements and long-term growth objectives across the island of Ireland.
Forensic Accounting
Our forensic accounting team specialises in fraud investigations, matrimonial disputes, and business valuations. We provide expert court testimony and corporate intelligence services, combining accounting expertise with investigative skills. The team supports dispute resolution processes through detailed financial analysis and expert witness reporting, adding value in complex legal and commercial contexts.
Grant Applications
We assist businesses with identifying and applying for grant funding opportunities across both UK and Irish jurisdictions. Our specialists prepare business plans for funding applications and manage the submission process to maximise success rates. With extensive experience in capital expenditure, job creation, and R&D grants, we help clients access financial support they might otherwise miss due to time constraints.
People
John MacMahon
Managing Partner
BComm FCA, John founded the practice in 1982 and leads our cross-border strategy. With extensive experience in international tax matters, he oversees client relationships and practice development across all three office locations.
John McGinn
Partner
FCA, John specialises in audit and assurance services with particular expertise in manufacturing sectors. He manages our audit quality control processes and maintains our registration with the Institute of Chartered Accountants in Ireland.
James MacMahon
Partner
BA ACA CTC, James focuses on tax compliance and planning for corporate clients. He leads our cross-border tax team and provides specialist consultancy on UK-ROI tax regime interactions for business clients.
Lisa Fegan
Associate Director
BA FCA, Lisa manages business advisory services with a focus on family-owned enterprises. She provides strategic guidance on business succession planning and corporate restructuring across the island of Ireland.
Gervase Kelly
Associate Tax Director
CTA ATT, Gervase leads our personal tax planning services. He specialises in inheritance tax mitigation strategies and cross-border personal tax compliance for individuals operating across UK and Irish jurisdictions.
Questions
What cross-border accounting services do you offer?
We specialise in UK-ROI tax compliance, dual jurisdiction accounting, and regulatory navigation for businesses operating across both jurisdictions.
How do you support family-owned businesses?
We provide succession planning, business development strategies, and tailored financial guidance specifically designed for family-run enterprises.
Can you assist with grant funding applications?
Yes, we identify suitable grants, prepare business plans, and manage the application process to maximise funding success rates.
What audit services do you provide?
We offer full statutory audits with specialist experience in manufacturing, construction, and agricultural sectors across Ireland and the UK.
How do you handle tax investigations?
Our team provides representation and strategic support during tax investigations, including voluntary disclosure arrangements.
What business advisory services are available?
We offer financial restructuring, merger/acquisition advice, and strategic planning tailored to your business's specific needs.
