Costello John Tax Associates

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311 Highland Ave
Somerville, MA 02144

Costello John Tax Associates is a full-service accounting firm based in Somerville, MA, offering a wide range of services for business owners, executives, and independent professionals. With a focus on personal financial planning, estate planning, small business accounting, tax services, and more, the firm provides affordable, experienced, and friendly assistance to meet the diverse needs of its clients.

Specializing in IRS audit representation, tax preparation, business valuation, and strategic business planning, Costello John Tax Associates is dedicated to helping individuals and businesses navigate complex financial matters with expertise and professionalism. Clients benefit from secure document storage, convenient file sharing options, and access to a team of knowledgeable professionals committed to delivering exceptional service.

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3.55 reviews
Photo of Danny J.
Danny J.
1/10/2016

John has been extremely helpful to me when I initially started my small business and was even more helpful when I had a dilemma dealing with the mortgage on my house. I have recommended him to...

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Brian W.
4/17/2025

TLDR: Unresponsive, not accurate, rude, and would have cost us thousands. This was the worst tax experience of my life. John was very short via email if he replied at all. In addition: 1) He...

Rita C.
1/18/2022

John Costello has been preparing my tax returns for too many years to mention . Around June 20, 2021, I received a letter from the IRS stating that they needed more information to process the...

Julia G.
8/31/2017

What a helpful guy. I inquired online, got a call nearly instantly, and he gave efficient and thorough advice on the phone without even needing to come in for an appointment. Very grateful for his...

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Anthony Z.
12/1/2015

As a business owner John gives me piece of mind when it comes to my taxes. He is very dedicated to saving me money and for that I appreciate .

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