William J. Lilly, CPA

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At William J. Lilly CPA PC, a Long Island CPA firm, we provide a wide variety of accounting, tax, and financial management services tailored to meet the needs of our business clients. Our certified public accounting (CPA) services are designed to make your job easier and provide you with more time to focus on building your business on Long Island. We keep abreast of tax law changes throughout the year to ensure that you are taking advantage of ALL tax incentives.
To better meet the needs of our accounting and tax clients throughout Long Island, we also have individualized accounting services for small businesses in industries such as real estate accounting, construction accounting, technology accounting, hospitality accounting, professional services and other consumer service businesses. These individualized services have enabled us to address your industry specific challenges, compliance needs and industry standard tax practices.
Industry Specific Services

Real Estate Accounting -- developers, investors, operators, mortgage brokers, and other real estate related industries
Construction Accounting -- general contractors, home builders, electricians, plumbers, painters and other construction trades
Technology Accounting -- software developers, IT consultants, Internet providers and other technology specialties
Law Firm Accounting -- personal injury law, family law, labor, employment law, and other legal specialties
Hospitality Accounting -- restaurants, hotels, resorts, and recreation
Professional Services Accounting -- architects, information technology and other consulting services
Consumer Services Accounting -- insurance, retailers/wholesalers, and other consumer services

We offer a FREE initial consultation for business owners. Call us today at 631-675-0231 and ask for Bill to find out how we can help you with your accounting and tax requirements.

Accounting software assistance -- QuickBooks and Peachtree Accounting
Long Island Incorporation and new business advisor

William J. Lilly CPA PC, is a Long Island CPA firm that provides a wide variety of accounting, tax and financial management services. Our clients are located in towns like Smithtown, Hauppauge, Commack, Central Islip, Brookhaven, Setauket, Stony Brook, Port Jefferson, Coram, Centereach, Bohemia, Deer Park, and more. We also service clients in Nassau County.