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

IRS cyber weaknesses put taxpayer data at risk again, TIGTA says
For the second consecutive year, a government watchdog found the IRS's cybersecurity program ineffective. TIGTA warned that taxpayer data could be vulnerable if security weaknesses are not addressed.
Author: By Martha Waggoner
Posted: September 21, 2026, 6:01 pm
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