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

Unclear instructions, limited awareness plagued CP53E rollout, TIGTA says
Many CPAs and their clients experienced confusion over IRS CP53E notices during the 2026 filing season. A TIGTA report confirms those concerns and sheds new light on how the IRS implemented its paperless-payment initiative.
Author: By Martha Waggoner
Posted: September 18, 2026, 4:46 pm
Government says Kwong court misread COVID tax relief law
In its opening brief to a federal appeals court Wednesday, the federal government said a lower court ruling in Kwong improperly turned a 60-day extension into a postponement period lasting over three years.
Author: By Martha Waggoner
Posted: September 16, 2026, 9:32 pm
Driving efficiency or driving workers toward burnout? How AI is being used
Nearly two-thirds of employees in a global survey said their company is more interested in using artificial intelligence to create efficiency than to add value, leading many to feel like they’re doing two jobs while struggling to find time to produce meaningful results.
Author: By Bryan Strickland
Posted: September 15, 2026, 3:30 pm