Hallisey & D’Agostino, LLP is a full-service public accounting firm offering a wide array of accounting, tax, and advisory services to individuals and small to mid-size closely-held businesses located throughout Connecticut and the surrounding areas.

Accounting & Assurance

Whether it’s assisting with routine bookkeeping issues or advising on a complex transaction during an audit, we have the skills and resources necessary to help you produce accurate, high-quality and timely financial information.

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Tax

Tax laws and regulations are in a constant state of flux and we recognize that in addition to experience, staying up-to-date on current developments is critical in creating a comprehensive tax strategy.

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Business Advisory

From start-ups to established enterprises, businesses at every phase need sound advice to navigate operational challenges, succession planning, and an ever-changing regulatory landscape.

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Individuals

Achieving your financial goals and ultimately a secure retirement requires discipline and the right mix of personalized wealth accumulation and preservation strategies, including tax minimization and trust & estate planning.

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Tax, accounting, auditing news - Journal of Accountancy

Dellinger, Gallegos honored by AICPA Tax Division
Arthur J. “Kip” Dellinger Jr. received the Arthur J. Dixon Memorial Award, and Mark Gallegos received the Jonathan Horn Distinguished Service Award during the 2026 AICPA National Tax Conference.
Author: By Bryan Strickland
Posted: November 10, 2026, 1:15 pm
IRS official signals additional guidance on AI, practitioner fees
The IRS Office of Professional Responsibility (OPR) plans additional guidance on artificial intelligence and practitioner fees after concerns from the AICPA and other groups about language in earlier guidance. Speaking at the AICPA National Tax Conference, the OPR’s director said the agency was not suggesting practitioners must reduce fees simply because AI improves efficiency.
Author: By Martha Waggoner
Posted: November 9, 2026, 10:27 pm
IRS expands Tax Pro Account to allow payments on behalf of business clients
The IRS has expanded the Tax Pro Account to allow authorized tax professionals to make certain payments on behalf of business clients, building on a series of recent enhancements to the online service.
Author: By Martha Waggoner
Posted: November 6, 2026, 10:04 pm