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Philip S. "Phil" Olsen

Trusted tax attorney serving Boston.

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Philip S. "Phil" Olsen is an attorney based in Boston, MASSACHUSETTS. The practice focuses on Tax. Currently practicing at Davis, Malm & D'Agostine PC.

Based in
Boston, MASSACHUSETTS
Experience
attorney
Known for
Tax
  • Handles Tax matters from Boston, MASSACHUSETTS.
  • Recognized with Best Lawyers in America — Tax Law (2026).

About Philip S. "Phil" Olsen: Philip S. "Phil" Olsen is an attorney based in Boston, MASSACHUSETTS. The practice focuses on Tax. Currently practicing at Davis, Malm & D'Agostine PC.

Areas of practice

Practice focus

Philip S. "Phil" Olsen represents clients in Boston, Massachusetts across the following areas of law. Each area links to other verified attorneys with the same focus.

Biography

About Philip S. "Phil" Olsen

Phil is a tax attorney focusing on state and local tax consulting and litigation. He has over 30 years of experience litigating and resolving major tax controversies before state supreme and appeals courts and administrative boards. While he has a solid track record of litigating cases, he has also successfully and discretely resolved hundreds of cases short of trial. His experience spans just about every area of state and local tax, including corporate income, sales and use, personal income and estate tax. Phil also represents owners and tenants in real and personal property tax valuation and exemption cases.

Before entering private practice, Phil served as a senior trial attorney and litigation supervisor for the Massachusetts Department of Revenue where he represented the Department in many landmark tax cases. This experience gives him an broad perspective when representing his clients before tax authorities.

Recent Matters Include:

  • Obtained manufacturing classification for energy client resulting in annual property tax savings in excess of $1 million.
  • Successfully represented numerous high-net-worth individuals who changed their domicile from Massachusetts to other states.
  • Eliminated a $30 million sales and use tax assessment against a financial services company by demonstrating that the Department of Revenue’s sampling methodology was flawed.
  • Successfully defended multi-national pharmaceutical, technology, media and manufacturing corporations in income, sales and property tax disputes.
  • Reversed a Department of Revenue denial and obtained a $1.5 million Brownfields tax credit for a real estate development client.
  • Successfully appealed a $9 million innocent spouse tax assessment.
  • Negotiated local property tax agreements and litigated reductions for owners of commercial, industrial, energy and hospitality properties.

Credentials

Education

  • Suffolk University

    J.D.

  • Stonehill College

    BA

Jurisdictions

Bar admissions

  • Massachusetts, Unite

    ACTIVE

Recognition

Awards & honors

  • Best Lawyers in America — Tax Law

    2026

  • Best Lawyers in America — Additional Areas of Practice:

    2026

  • Best Lawyers in America — Litigation and Controversy - Tax

    2026

  • Best Lawyers in America — Awards:

    2026

  • Best Lawyers in America — Boston Magazine Top Lawyers, 2025

    2026

  • Best Lawyers in America — Massachusetts Super Lawyers, 2004, 2021-2024

    2026

  • Best Lawyers in America — Named a Massachusetts “Go To Taxation Lawyer” by

    2026

  • Best Lawyers in America — Massachusetts Lawyers Weekly

    2026

  • Best Lawyers in America — , 2024

    2026

Locations

Office locations

Main office

Davis, Malm & D'Agostine PC

255 State Street, 11th Floor

Boston, Massachusetts 02109

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Frequently asked

Common questions

  • What areas of law does Philip S. "Phil" Olsen practice?

    Philip S. "Phil" Olsen focuses on Tax.

  • Where is Philip S. "Phil" Olsen located?

    Philip S. "Phil" Olsen primarily serves clients in Boston, Massachusetts, with an office at 255 State Street, 11th Floor.

  • Is Philip S. "Phil" Olsen a verified attorney?

    Philip S. "Phil" Olsen's profile is listed but has not yet been claimed by the attorney. Verification status is pending.

  • How can I schedule a consultation with Philip S. "Phil" Olsen?

    You can book a consultation through LawyersListed directly from this page. Initial outreach can also be made by phone at 617-367-2500.