The Right Answer at the Right Time

Vallas & Arrison, PC, provides individual and business tax and accounting services performed by certified public accountants that outperform the norm.

We have over 50 years experience in tax compliance and financial reporting. It is our service at Vallas & Arrison, PC and our planned approach that sets us apart. Whether servicing businesses or families, with Vallas & Arrison, PC, you get innovation, tax preparation strategies, and personal attention as well as professional expertise. Yes, even after April 15.

We agree that you should keep more of your money every year. Plan for it, act on it, and choose trusted advisors.

Contact us for an initial meeting today: 978-486-9855 or This email address is being protected from spambots. You need JavaScript enabled to view it..

Littleton, Massachusetts based Vallas & Arrison, PC serves Massachusetts and New Hampshire.

  • Denise H., Bolton, MA

    I have had the pleasure of working with Thom Arrison since 2003. As a professional bookkeeper, on behalf of my clients I work closely with CPAs and accountants. Without a doubt, Thom is among the best if not the best I have had the pleasure of working with. Not only is he knowledgeable and experienced, but he is incredibly responsive and sensitive to the needs of his clients. My clients and I love that. Personally speaking; I have learned a great deal from him and have the utmost respect for his expertise and professional abilities.
  • Residential Manager, Billerica, MA

    It is a pleasure to work with Thom. He is responsive and knowledgeable. Phone calls are always returned and he takes the time to really get to know your business so that he can be of significant and reliable assistance. Another plus is that there are no surprises with the billing because there is always communication.
  • Terry L., Boxborough, MA

    Thom has done great work for me, both as a company owner and as an individual. He doesn't nickel and dime you, and you can ask him a question without worrying about a big bill. He helped me out tremendously in organizing my finances if a way that made sense. I am happy to recommend Thom!
  • Dave K., Littleton, MA

    We have had Thom Arrison as our accountant from the day I went independent and started my own consulting practice. His approach to complex IRS and state tax preparation is very straightforward and comprehensive. He is available year round for consultation, and I trust his judgment every step of the way. We are completely comfortable with Thom at the "helm" of our tax journeys in an environment that could otherwise be anxiety provoking. I would recommend Thom's services to anyone that asks.
  • Joe H., Ayer, MA

    Before Thom Arrison, our corporate taxes were always filed late and our existing accountant was difficult to contact. We hired Thom in 2004 and he quickly improved the situation. Thom worked with our existing bookkeeper and payroll company to help streamline our accounting process. Thom Arrison is always available for questions. I can count on Thom to return phone calls and answer emails. Communication with Thom Arrison is year around and this has helped me grow my business.
  • Betty C., Pepperell, MA

    Thomas has been a great source of knowledge and guidance for my business including a partner buyout as well as both business and personal taxes. He also has great knowledge of QuickBooks giving quick and detailed instructions when I encounter challenges managing my accounting.
  • Mary M., Charlemont, MA

    Thom has done both small business and personal income tax preparation for me, dating back to 1999. In that time, I have always been impressed by his professionalism, competence, patience and flexibility. He works in a business with intense seasonal demands, but is never less than gracious and accommodating. Unlike the run-of-the-mill tax preparer, Thom is a seasoned professional who can offer sound advice for both personal and business finances. If you need the services of a real accountant, you cannot do better than Thom Arrison!
  • Judith G., Tyngsboro, MA

    I have had several other companies help me with my accounting in the past and none of them have provided the consistent high level of service. Correspondence, emails and phone calls are promptly returned. Everyone in his office is knowledgeable and personable and I can recommend Thom without reservation. Thom has handled both my personal returns and my business returns since 2005.
  • Cheryl D., Littleton, MA

    I have known Thomas Arrison for 14 years. His office provides audit services for a not-for-profit arts organization where I was the finance director. ...he has provided invaluable and professional advice and assistance. I never felt rushed when I stopped by or phoned for help. He was always eager to make sure I understood the audit financial statements and corresponding IRS filings. He and his office were invaluable assets to me. When I left the arts organization for a new start up company, one of my first tasks was to hire Thomas Arrison, PC to be our accountant. A decision that I do not regret.

The two most beautiful words in the English language are, ‘Check enclosed.’

Dorothy Parker


Got questions?
We've got answers.

tel: 978-486-9855
fax: 978-486-9088
This email address is being protected from spambots. You need JavaScript enabled to view it.

Vallas & Arrison, PC
312 Great Road
Littleton, MA 01460-0771

2 Burlington Woods Drive
Suite 100
Burlington, MA 01803

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