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.

Read more →

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.

Read more →

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.

Read more →

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.

Read more →

Tax, accounting, auditing news - Journal of Accountancy

Problem solved: A math example of CPA-led assurance using AI agents
A CPA who recently solved a 40-year-old math problem using AI believes that the “gold rush” to solve similar problems is creating a golden opportunity for CPAs in the assurance space.
Author: By Bryan Strickland
Posted: October 19, 2026, 5:14 pm
AICPA partners on new offering that assures AI systems and agents
The first-of-its-kind assurance certification, developed with the Artificial Intelligence Underwriting Company, is in a piloting phase and is expected to fully launch in early 2027.
Author: By Bryan Strickland
Posted: October 19, 2026, 12:03 pm
Final regulations clear path for direct IRS card payments
The IRS on Friday issued final regulations implementing Taxpayer First Act provisions that would allow taxpayers to make credit and debit card tax payments directly to the IRS rather than through third-party payment processors. The final regulations adopt, without change, proposed regulations issued in July 2024.
Author: By Martha Waggoner
Posted: October 16, 2026, 7:10 pm