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

A new top 5 firm: Grant Thornton acquiring fellow top 10 firm CBIZ
The deal, which includes an investment by private-equity company New Mountain Capital, will create a footprint featuring 34,000-plus employees in more than 20 countries and territories.
Author: By Bryan Strickland
Posted: July 29, 2026, 6:33 pm
FinCEN director expects final BOI reporting rule soon
The director of the Financial Crimes Enforcement Network told a congressional subcommittee that she’s “very optimistic” that the final rule will be issued before the end of the year.
Author: By Martha Waggoner
Posted: July 29, 2026, 6:23 pm
As AI use in cybersecurity rises, so do the risks
The share of respondents actively using AI in cybersecurity strategy rose sharply in a global survey, but governance is not maturing at the same pace as deployment.
Author: By Steph Brown
Posted: July 28, 2026, 11:53 am