William J. "Bill" Kambas

William J. "Bill" Kambas


Withersworldwide

Recognized since 2017

New York, New York

Practice Areas

Tax Law

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Bill’s practice is focused on tax planning for multi-national and multi-state personal, active business, and investment activities, with a particular emphasis on tax structuring and choice of business entity for US and non-US business owners and investors. He has represented a wide variety of private and public businesses including family owned, start-ups and multi-million dollar enterprises on purely domestic as well as inbound and outbound business transactions, cross-border investments (whether made directly or through investment funds or joint ventures), and qualification for US tax treaty benefits. In particular, Bill has considerable experience advising non-US persons on the US income and estate tax consequences and tax planning associated with the ownership of US real estate (whether residential or commercial, developmental, operational, or personal use). Bill is also admitted to practice before the United States Tax Court and assists clients with responding to inquiries from US federal and state tax authorities.

Location
  • 430 Park Avenue, 10th Floor
    New York, NY 10022-3505
Education
  • University of Connecticut, J.D., graduated 2003
  • Skidmore College, B.A.
  • University of Connecticut - Greater Hartford, M.B.A.
Bar Admissions
  • Connecticut, 2003
  • New York, 2004
  • Wyoming, 2019
Affiliations
  • Hellenic Bar Association of Connecticut - Member
  • International Fiscal Association (Westchester, NY and Connecticut Region), Executive Committee - Member
  • Saint Barbara Greek Orthodox Church Endowment Fund - Chairman
  • Skidmore College Annual Fund - President
  • Society of Trust and Estate Practitioners "STEP" (New York) - Chair of Communications
Court Admissions
  • United States Tax Court

Withersworldwide
Headquarters: New York, New York

29 The Best Lawyers in America® awards

21 Best Lawyers: Ones to Watch® in America awards

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Recognized in The Best Lawyers in America® 2025 for work in:
  • Tax Law
Additional Areas of Practice:
  • Closely Held Companies and Family Businesses Law

Publications

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