Justin Gilmartin, JD

Managing Director, Tax Services

Boston, MA
Focus Areas

Stock Options and Equity Compensation
Tax Planning
Estate Planning

Client Specialty

Business Owners

As the Managing Director of Tax Services at The Colony Group, Justin leads a team that prepares over 3,000 individual, trust, entity, and foundation tax returns annually. Justin is a member of our Diversity, Equity, and Inclusion Council. Prior to joining The Colony Group, he worked for Kahn, Litwin, Renza & Co. where he prepared and reviewed tax returns for high net worth individuals as well as partnerships and corporations.

Justin earned his Bachelor of Arts from Holy Cross majoring in Economics and Accounting. He went on to receive a Juris Doctor from Boston College Law School and is admitted to practice law in the Commonwealth of Massachusetts. In his spare time, Justin enjoys spending time with his wife and two daughters, traveling, and golf.

Published Insights

Year-End Tax Planning 2023

With a divided Congress and the 2024 elections on the horizon, it is unlikely that we will see any major federal tax legislation in the immediate future. In turn,...

Year-End Tax Planning 2022

For the past two years we have prepared for the potential passage of major tax legislation. Due to razor-thin margins in Congress, however, the sweeping proposals of the Build...

Now’s a Good Time to Focus on Tax-Loss Harvesting. Here Are 7 Tips.

“Sometimes the best move is not to make any move,” says Justin Gilmartin of The Colony Group to Cheryl Winokur Munk via Barron’s. Read...


Last year at this time we were faced with uncertainty regarding potential tax-related changes, preparing for potentially massive changes to the income and estate tax rules. The proposed tax...

Webinar Recording – Caution: Tax Changes Ahead

The Biden Administration has proposed sweeping changes to the tax code that could affect your taxes in many areas, including personal income, employment, estate, gift, and corporate taxes. With...

What You Need to Know About the Latest COVID-19 Relief Bill

Last week, Congress passed a $900 billion relief bill called The Consolidated Appropriations Act, 2021 (the Act).  The legislation was signed into law by the President on Sunday, December...

Year-End Tax Planning 2020

The many challenges of 2020 have of course been exacerbated by the heightened uncertainty surrounding them. While the human challenges remain the most critical, from a financial-planning perspective, many...

Should you plan for higher taxes now? Yes, say tax professionals.

With the election just around the corner, we thought it would be helpful to alert you to some of the tax planning ideas we are currently considering for clients....


It has now been almost two years since the Tax Cuts and Jobs Act (TCJA) passed at the end of 2017.  The stated intention of the TCJA was to...