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About Us

future-oriented For

24 Years...and counting.

Belli Monaco Inc., organized in 1996, is as accounting firm located at 350 Motor Parkway in Hauppauge, New York. We are a progressive and conscientious accounting firm dedicated to offering expert consultation and sound financial advice to our clients.

Belli Monaco’s many years of accounting and tax experience offers our clients knowledge and progressive solutions to suit their specific needs. Belli Monaco Inc. provides skillful hands-on accounting and consulting services to companies, large and small, in a broad range of industries such as: manufacturing, construction, food service, medical and legal professionals, and non-profit organizations. We offer an full array of services to our clients including full accounting services, business start-up counseling, tax planning and preparation, business consulting, estate planning and preparation. 

“A law is valuable, not because it is a law, but because there is right in it.”

henry ward beecher


Arthur A. Belli, Jr.

Partner at Belli Monaco Inc. Artie is an accomplished Accounting Professional with over 25 years of expertise in accounting and consulting services for a diverse range of business clients while still maintaining a large practice of individual and business tax clients. He has headed the Accounting Departments of small family-run businesses through large privately-held software design, broker/dealer and transportation companies. While serving as the Controller for a major software design company in Connecticut, Artie managed the Accounting and Human Resource Departments for the entity’s two domestic and three international locations (Singapore, India and the United Kingdom).

Artie has helped many individuals manage their financial health as he is no stranger to the financial pressures of both the business owner and the individual. Additionally, his involvement with various charitable organizations and community groups has lent to a greater understanding of the specific accounting needs of the not-for-profit genre. Artie has served as Treasurer for a political campaign and was named “Principal For A Day” by the New York City Department of Education for his work with underprivileged students.

Artie is an active member of the National Association of Tax Professionals and participates in various conferences year-round to continue to develop his extensive tax knowledge.

Artie earned his Bachelor of Business Administration in Accounting from Long Island University, CW Post.

Artie lives in South Huntington and has three daughters, attending Universities in New York studying towards their Undergraduate degrees.


Nicholas A. Monaco EA

Partner in Belli Monaco Inc., Nicholas A. Monaco is an Enrolled Agent and is licensed to represent clients before the Internal Revenue Service. Nick is an accomplished Tax Professional with 28 years of personal and business tax preparation experience.  He specializes in the representation of clients before the Internal Revenue Service and the New York State Department of Taxation and Finance on issues related to income and sales taxes.

Nick is an active member of the National Association of Enrolled Agents (NAEA). Additionally, he is a member of the New York Society of Enrolled Agents (NYSEA) and a member of the National Association of Tax Professionals (NATP).  He has participated in numerous conferences and seminars regarding federal and state tax issues.

Prior to working full time at Belli Monaco Inc. Nick had a full time career as an educator for thirty years. Nick earned a Bachelor of Arts in Social Sciences from St. Joseph’s College and a Masters of Science in Education from Long Island University, C.W. Post.

Nick lives in Sayville with his wife Linda and has two sons, Brian currently in Medical School and Christopher currently in Law School, both in the State of Florida.