With almost 35 years of experience and expertise, the team at Mulhern Leonard & Associates offers you a comprehensive suite of financial and accountancy services that go beyond ensuring compliance to add value to your business.

Our staff are experienced professionals trained to provide a hands-on service to our varied client base. Our services include audit, accounting, tax, internal audit, payroll and bookkeeping, corporate and business recovery, business consultancy, financial services, company secretarial and corporate finance.

Our client base consists of small to large sized companies and owner managed businesses and partnerships. It represents a diverse range of businesses covering such sectors as retail and distribution, property, construction, tourism and hospitality, professional services, sporting organisations, not for profit organisations, agricultural and food processing. We also act as auditors and consultants to credit unions.

Sean Mulhern & Co was established in 1992 in Boyle, Co Roscommon. Following rapid growth, a second office was opened in Sligo in 1995. The firm acquired the Boyle practice of J.A. Leonard & Co. (EST 1956) in 1997 and changed its name to Mulhern Leonard. In February 2026, Mulhern acquired Casey Accountants in Carrick on Shannon. In May 2026, the firm further expanded with the opening of a new office at 104 Hill Avenue, Ebrington Square, Derry City BT48 6HF, marking an exciting step into the Northern Ireland market.

Private individuals needing personal tax advice: Whether you're managing your income, preparing for retirement, or navigating complex tax matters like capital gains or inheritance tax, we offer clear, actionable advice to help individuals plan, optimise, and safeguard their financial future.

Start-ups looking to get established with strong financial foundations: We work closely with entrepreneurs to set up their businesses on a solid financial footing. From structuring the business and managing cash flow to understanding tax obligations, we help you make strategic decisions for long-term success.

SMEs seeking cost-effective outsourced finance departments: Many growing businesses don’t have the need or resources for a full-time finance team. We offer outsourced finance services to manage everything from bookkeeping and payroll to management accounts, ensuring your business runs efficiently and stays compliant while saving you time and money.

Family businesses planning succession or retirement: Family-run businesses face unique challenges when it comes to succession planning and preparing for the future. We help you navigate the complexities of passing on leadership, managing tax implications, and ensuring a smooth transition to the next generation.

Growing firms exploring funding, expansion, or international trade: As your business expands, you need a partner who can help you access new opportunities. Whether you’re seeking investment, expanding your market, or exploring global trade, we provide the guidance and resources to make your growth plans a reality.

Corporates requiring audit, compliance, or advanced advisory services: For larger organisations, we offer sophisticated solutions to ensure compliance, streamline operations, and provide strategic direction. From audits and regulatory compliance to high-level financial advisory, we support corporate clients in achieving sustainable, long-term success.

Proactive tax planning that keeps more of your profits where they belong — in your business: We go beyond simple tax filing by helping you optimise your tax position throughout the year. By identifying potential tax savings, claiming all eligible deductions, and leveraging tax reliefs, we ensure you keep more of your hard-earned profits to reinvest in your business and achieve long-term growth.

Clear financial reporting to give you visibility over cash flow, profitability, and growth: We provide regular, detailed financial reports that give you a clear picture of your company’s financial health. Whether it’s cash flow analysis, profit margins, or tracking expenses, our reports help you make informed decisions, monitor progress, and identify areas for improvement.

Regular strategic check-ins to align your business performance with your long-term goals: We don’t just provide reports and advice — we partner with you for regular reviews to ensure your business is on track to meet its goals. By evaluating your financial position, performance metrics, and strategic initiatives, we help you adjust your approach to stay aligned with your long-term vision.

Smart structuring and compliance to help you avoid penalties and prepare for the future: Proper business structure and tax compliance are essential for long-term success. We advise on the best legal and financial structures for your business, helping you stay compliant with regulations while reducing the risk of penalties, audits, or costly mistakes.

Personalised support from a team that takes the time to understand your business: Every business is unique, and so are its financial needs. Our team takes the time to get to know your business, its challenges, and opportunities. By understanding your specific circumstances, we offer bespoke advice and solutions tailored to help you thrive, providing ongoing support every step of the way.