William L. Inchoco

Bio headshot of William L. Inchoco.

Of Counsel

Location: Annapolis Office
Phone: 202-618-1873
Fax: 888-235-8405
Email: Contact Us

With more than 15 years of experience, William is an accomplished international tax professional with a proven track record of results blending business, legal, public policy, and taxation expertise in advising multi-national business organizations.

William provides invaluable counsel for clients operating in an environment of intense scrutiny and challenges brought about by the changing tax laws and ever-increasing regulatory environment. He has extensive expertise in international acquisitions, reorganizations, and global restructuring, as well as U.S. inbound/outbound tax issues.

William joined Frost Law in 2021 as Of Counsel with combined Big Four and corporate experience. Previously, he served as the International Tax Senior Advisor with the Global Tax Operations group at IBM Corporation in New York. His previous experience also included positions at Deloitte Tax LLP, Ernst & Young LLP. Prior to that, William was an Arthur Andersen professional servicing clients in Ho Chi Minh City in Vietnam and Manila, Philippines.

Areas of Practice

  • International Tax

Bar Admissions

  • Foreign (Philippine BAR)


  • Harvard Law School, International Tax Program Fellow
  • Harvard Kennedy School, Master’s in Public Administration
  • Ateneo de Manila University, A.B. Political Science

Professional Organizations and Memberships

  • International Fiscal Association Westchester, NY/CT Region, Executive Vice-President


  • Lecturer in international tax at Fairfield University, Dolan School of Business

Published Works