About Us

We offer a wide range of accountancy services for all businesses and organisations across all sectors…

Our-ServicesMcMahon & Co have a wealth of experience in serving the needs of individuals and small and medium sized businesses. Whether you are an entrepreneur looking to start a new business venture or an established private company, we offer a full complement of services designed to deal with your financial needs and add value to your business.

Client service is at the forefront of everything we do. The principle services that we offer are:


McMahon & Co - Certified Public Accountants

30 Years of Experience

Our Portadown-based office has been providing accountancy services to businesses for over 30 years!

Friendly & Efficient

We pride ourselves on our commitment to providing a fast, friendly and efficient service to all clients!

Loyal Clientele

For the past 3 decades we have continued to receive loyal support from our list of delighted customers!

Planning for the future

Our professional team stay updated on all changes to Legislation and technology to help you avail of all the latest services!