Helping businesses in Killorglin and across Kerry thrive with expert accounting, tax, and advisory services.

We’ve proudly supported individuals, sole traders, and companies of all sizes for over 35 years — helping them stay financially healthy, tax-compliant, and confident about the future.

At Sean O’Sullivan & Co, we do more than prepare accounts. We work alongside our clients to help them grow, adapt, and succeed. With decades of combined experience across accounting, taxation, business strategy, and financial planning, we’re committed to providing clarity, control, and trusted advice at every stage of your business journey.

We serve a broad range of clients across Ireland — from start-ups and family-run businesses to growing SMEs and established corporate groups. Our solutions are tailored, practical, and designed to go beyond compliance, helping you build a more efficient, future-ready business.

Whether you’re launching something new, planning for retirement, managing tax, or preparing for succession — we’re here for the long term.

Private individuals needing personal tax advice
Whether you're managing income, planning for retirement, or navigating capital gains or inheritance tax, we offer clear, tailored advice to help safeguard and optimise your personal finances.

Start-ups looking to get established with strong financial foundations
We work closely with entrepreneurs to structure their business, understand tax obligations, and manage cash flow — setting them up for long-term success from day one.

SMEs seeking cost-effective outsourced finance departments
Many growing businesses lack the resources for a full in-house finance team. We offer outsourced bookkeeping, payroll, and financial reporting — helping you stay compliant while saving time and money.

Family businesses planning succession or retirement
Succession planning comes with unique challenges. We guide you through tax implications, leadership transitions, and compliance to ensure a smooth handover to the next generation.

Growing firms exploring funding, expansion, or international trade
As your business grows, we help you access investment, expand into new markets, and explore cross-border opportunities — turning growth plans into reality.

Corporates requiring audit, compliance, or advanced advisory services
For larger organisations, we provide audit support, regulatory compliance, and strategic financial direction to enhance performance and drive long-term success.

Proactive tax planning that keeps more of your profits where they belong — in your business
We don’t just file your taxes — we plan ahead. By identifying deductions, tax reliefs, and savings opportunities throughout the year, we help you reduce liabilities and reinvest more into your business for long-term growth.

Clear financial reporting for visibility over cash flow, profitability, and growth
We provide regular reports that make sense — giving you a real picture of your company’s financial health. From cash flow and expenses to margins and trends, our insights help you make informed decisions at every stage.

Regular strategic check-ins to align performance with long-term goals
Our work doesn’t end with the numbers. We partner with you to review your financial position, track key metrics, and adjust strategy where needed — helping your business stay focused, agile, and on course.

Smart structuring and compliance to avoid penalties and protect the future
We advise on the best financial and legal setup to suit your business, reduce risk, and ensure compliance — helping you avoid unnecessary penalties or costly mistakes down the line.