About John

John Larkin is a tax partner at Marcum, delivering planning and consulting services to businesses and individuals throughout Long Island. He specializes in personal and business income taxation, estate and gift taxation, and business valuation. While John’s clients span a broad range of industries, he is particularly familiar addressing the needs of closely held businesses with multigenerational considerations and agricultural clients, including nurseries, farms, and landscapers.

Professional & Civic Affiliations

  • American Institute of Certified Public Accountants
  • Institute of Business Valuation, Member
  • New York State Society of Certified Public Accountants
  • Peconic Land Trust, Member Board of Directors, Assistant Treasurer
  • Hamptons State Bank, Former Board of Directors
  • Southampton Rotary Club, Treasurer and Member
Practice Focus

Tax Strategy
Succession Planning
Business Transitions and Legacy Management

Industry Focus



B.A., Accounting
State University of New York College at Plattsburgh