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Accounting Firm

John MacMahon & Co

Cross-border chartered accountants and registered auditors with offices in Belfast, Newry and Dundalk

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About John MacMahon & Co

John MacMahon & Co is a chartered accountancy and audit practice that works on both sides of the border on the island of Ireland. Since 1982 it has handled UK and ROI tax and compliance for clients from local firms to global groups.

What John MacMahon & Co does

  • Accounting and audit: support across the range of accounting issues, including the audit process.
  • Tax planning and compliance: expertise in tax, especially cross-border questions.
  • Business advisory: consultancy tailored to an individual business.

Customers and markets

The firm specialises in family businesses and start-ups. Its clients are concentrated around Newry and Belfast and in Counties Down, Armagh, Louth and Monaghan, with others from across Ireland and the UK.

Key facts

  • Based in: Belfast, Newry and Dundalk
  • Founded: 1982
  • Team: about 30 qualified staff
  • Status: chartered accountants and registered auditor
  • Software: works with all the main accounting packages

Profile written by TrustList from the business's own published information, Oct 2026.

Categories & features

Rankings

As of 2026-10-29. Organic ranks only; sponsored placements are never ranks.

What the business tells TrustList

Founded
1982 (44 years) evidence sent

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