OSA McQuillan

OSA McQuillan is a Dublin-based accounting firm founded in 1995 that serves clients across Ireland. The firm helps startups and businesses navigate accounting, taxation, and compliance challenges, using modern accounting software and digital processes to deliver fast and accurate financial solutions.

The firm is headquartered at 69 Main St, Blackrock, Blackrock, A94 N6D0, Ireland, and employs fewer than 49 people. Minimum budget and hourly rate details are available on request.

OSA McQuillan's core service is accounting, covering business accounts preparation, tax strategy optimization, and regulatory compliance guidance. The team emphasizes responsiveness, trust, and speed in its client relationships, aiming to build long-term partnerships with personalized service.

The firm works primarily with small businesses, as well as clients in the insurance and banking industries. It positions itself as a go-to partner for companies looking to streamline their financial management.

On Google, OSA McQuillan holds a 4.7 out of 5 rating across 23 reviews. Most reviewers praise the team's reliability, responsiveness, and professionalism, with one client noting seven years of continuous service. One negative review reports an uncompleted company formation service and a refused refund.

The firm's social presence includes profiles on X, LinkedIn, and YouTube under Eamon O'Sullivan, who appears to lead the team.