About Mary

Mary Antonetti is a partner in the Firm’s New Haven office, specializing in tax compliance and consulting services for not-for-profit and healthcare organizations. She has 30 years of public accounting experience with national and international firms. Her extensive experience includes for healthcare and other tax-exempt organizations and their for-profit affiliates, including higher education institutions, NGOs, hospital systems, title holding companies, Official Catholic Directory entities, and private foundations.

Mary’s skillset includes consulting on the implications of tax reform, unrelated business income, alternative investments, foreign reporting, joint venture transactions, Section 501(r) of the Internal Revenue Code, restructuring, application for exempt status, IRS audit support, community benefit reporting, Community Health Needs Assessments (CHNA), tax-exempt bonds, HHS Provider Relief Funds, CARES Act, and private inurement issues.

She also has experience providing middle-market companies with general tax compliance and planning services focused on corporate acquisitions, dispositions, and reorganizations of entity structure, including consolidated groups, S-Corporations, and multi-tiered partnerships with domestic and foreign operations.Prior to joining Marcum, Mary served as a director with a Big Four firm located in Hartford.

Professional & Civic Associations

  • American Institute of Certified Public Accountants (AICPA), Member
  • Member, Connecticut Society of Certified Public Accountants (CTCPA), Member
  • AICPA Technical Resource Panel Exempt Organizations (AICPA TRP-EO), Former Associate Member
  • Healthcare Financial Management Association (HFMA), Member
Practice Focus

Tax Consulting
Tax Compliance
Unrelated Business Income Tax
Section 501 (r)
ASC 740 / FIN 48
IRS & State Audit Representation
Alternative Investments Analysis
Not-For-Profit Formation

Industry Focus



Masters of Science, Taxation
Bryant College

Bachelor of Science, Accounting
Fairfield University