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As one of the largest regional firms in New England, who was recently recognized by Accounting Today as a "Firm to Watch," Whittlesey provides expert counsel in the areas of accounting, audit, advisory and technology.

For more than five decades, Whittlesey has provided assurance services to thousands of for-profit and nonprofit clients. Focused on integrity and service, we customize our approach based on your specific needs while also providing business guidance, especially when key decisions need validation.

When objectives and related decisions are of critical importance, Whittlesey provides expert counsel in a variety of areas, including business, strategic and succession planning, asset protection, estate planning, security, tax advising, and computer network consulting.


Whittlesey has offered federal and state tax services for both individuals and businesses for more than five decades, working with clients year-round to provide services that cover everything from tax planning and preparation to tax compliance and financial audits.

Whittlesey provides businesses and nonprofit organizations with personalized services to optimize their technology, including network security and information systems reviews, with specialization in the areas of nonprofit technology, systems support, and cybersecurity.

Are You Protected?

One wrong click can cause a security incident or data breach and the impact could be devastating. Whittlesey's Cyber Security Assessment (CSA) is a comprehensive audit that will identify your level of cyber risk and a road map to improve it. 

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We deliver personalized, expert services. Find out what we can do for you.


How to get a tax break by offering family and medical leave to your employees.

By getting a business valuation, you know where your company stands if you want to sell it or otherwise transfer it.

How to be smart about combining business and pleasure travel to increase tax deductions.

Don't let that key person move on from your company without a plan to transfer that person's knowledge.

Don't just set goals for your business -- make a plan to achieve them, too. 

The Financial Accounting Standards Board proposed delays to two new accounting rules.

Changes are coming to the nonprofit parking and transportation fringe benefit tax.