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OSA McQuillan Your Local Dublin Accountants, Specialising in Startups and LimIted Companies

Accountants that support entrepreneurs and businesses achieve their ambitions through accountancy, tax and advisory services.

We are OSA McQuillan, a firm of Professional Accountants, we offer a range of accounting services to businesses. We have 30 years experience working with small and medium sized enterprises and business owners, and we are well placed to provide business advice on a wide range of areas from cash flow and debt management, tax planning, and profit improvement plans. In the delivery of our accounting services and in our regular meetings with business owners, we develop an in-depth awareness of the main drivers in your business.

Accounting – All companies are required to prepare and file accounts in the Companies Registration Office ( CRO ).  At OSA McQuillan Accountants Dublin, we take our duty to our client's compliance needs very seriously. We advise on accounting systems and can help set up finance departments for our clients. We can also advise on the best accounting policies and standards for your business to adopt.

Taxation – Our internal tax experts will review all areas of tax exposure for our clients. They make sure that your company does not fall foul of tax laws and will then come up with tax plans to reduce tax bills for companies, their owners and directors.  Why not make an appointment to speak to one of our partners in Dublin and find out how we at OSA McQuillan can help you to improve your business.

Management Accounts –  we can provide management accounts services to our clients. These services include monthly/quarterly accounts, key performance indicator reporting, working capital management, sourcing of finance and industry benchmarking and margin analysis.

So if you are looking for a trusted accountant firm that can provide a full suite of accounting services designed with your business in mind. Then give us a call today on the number below. We are based on Blackrock, Dublin.

Schedule An Appointment!

You can see a full list of what we can do for you if you have a look here: https://www.osamcquillan.ie/register-with-us/

Accountancy Firm Dublin

''Eamon O'Sullivan has a stress-free way of getting accounts done while still getting the advice across to help raise my profit.'' Robert Dill, IT Consultant

Specialist Accounting advice and expertise

  • Accountant Dublin - Accounts for businesses with all tax forms done, using technology to streamline the process speeding it up for everyone
  • Using fixed fee packages so everyone knows what the outcomes are - services, deadlines, fees, scope of job to be done
  • Specialists in engineering and IT - we can look after all VAT, PAYE and Companies Office requirements
  • Using technology to make everything easier, reducing the time you spend on your accounts and tax
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Heres what some of our customers had to say about us:

Eamon was my accountant for a number of years and during that time was always extremely approachable and provided me with invaluable advice time and again. I found him to be highly organised, efficient and very helpful in terms of growing my business. I am happy to recommend Eamon to any owner managed business looking for a personalised, professional service.

Gilly Balmer, Balmer Recruitment, Dublin

OSA McQuillan Accountants and Business Advisers

We promise you will get your accounts back faster.


The benefit of dealing with OSA McQuillan Accountants is that you can rely on us respond to your phone calls and emails that day.

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Many of our clients are with us for years, trusting us to take care of their accounting and tax needs.

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We produced business accounts for our clients in 2017 on average within 24 days of getting the books and records.

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