We work with a range of businesses across different industry sectors.


At D.A. O’Sullivan Associates, we provide all the accountancy services that help you to have more time to focus on what you do best.

We work beyond the numbers and provide knowledge and expertise on essential functions to help your business to grow.

Our staff are highly qualified and work with all business sizes. They have the expertise to provide you with sound business advice, making sure that you are spending your time and money effectively. We can help you to avoid common pitfalls of growing businesses and help you plan proactively for growth.

For over thirty years, we have accumulated a wealth of knowledge in business structures, taxation and the additional supports that businesses need outside the normal processing of accounts.



Find out about our team, who we are, and the quality services we offer to our clients.

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Our Partners

We have a range of partners that we work with to offer the best service possible.

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