Accountant Dublin

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Appoint us and never worry about Accounts and Tax Services. Don’t wait! Call now, first consultation free

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Mon-Fri: 9AM-6PM Sat/Sun: Closed
First Class Service

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You can see a full list of what we can do for you if you have a look here

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

We are a digital first accountancy company based in Dublin with clients in Dublin, across Ireland, and also have many clients based outside of Ireland who run businesses in Ireland.
We deliver great accounting, compliance, tax, accounting software, outsourcing and advisory services to business clients, from SME to large and corporate businesses, and private individuals.
We believe in using  about digital processes and the benefits that using the latest accounting software and applications can bring to every business. We care about our clients and are dedicated to delivering the best possible service to our customers.

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. 


Our tax experts 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.


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.

Schedule An Appointment!

You can see a full list of what we can do for you if you have a look here

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
Robert Dill
Director Robert Dill Computing

What our clients say

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.

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

We produced business accounts for our clients in 2022 on average within 28 days of getting the books and records.

OSA McQuillan, your leading accounting firm in Dublin! Located at 69 Main St. Blackrock Co. Dublin A94 N6D0, we take pride in offering top-notch accounting services to individuals, sole traders, and businesses alike. Our dedicated team of experts is committed to providing unparalleled support to meet your financial needs. Whether you require auditing, outsourcing solutions, or assistance with tax matters, our agency is here to help. Contact us today at or visit our office on Main Street Dundrum to experience our focused and professional approach to accounting. At OSA McQuillan, we are more than just accountants; we are your trusted partners in success.