About Aaron

Aaron Fox has more than 12 years of experience working with tax-exempt organizations. He came to Marcum via the Firm’s merger with Raffa, P.C., one of the nation’s preeminent public accounting and business consulting firms, specializing in nonprofits. Since joining the nonprofit specialty group in 2007, he has become a critical leader in the practice and is responsible for managing the tax compliance for our most complex and demanding clients.

Mr. Fox has helped grow the tax consulting practice by delivering exceptional tax research, Fin48 analysis, contract review assistance, and written tax memorandum. He now oversees federal and state tax return preparation for large tax-exempt organizations and their for-profit subsidiaries, quarterly and annual tax planning, and retirement plan filings. He advises clients on IRS reporting, corporate governance, international grantmaking and cross-border operations including withholding, creation and operation of for profit subsidiaries and affiliated nonprofits, group exemption rulings and maintenance of large exempt groups, minimizing unrelated business income, retirement plan filings, political and lobbying rules for advocacy organizations including PAC’s, as well as private foundation transactions and planning.

As an active writer and presenter, Mr. Fox has been influential in educating clients, board members, staff and others on a range of topics including lobbying regulation, political activity, nonprofit governance trends, Form 990 best practices, and compliance with foreign filing requirements.

Professional & Civic Affiliations

  • American Institute of Certified Public Accountants (AICPA)
Subject Matter Expertise

Tax Compliance
Tax Consulting
Board Governance

Practice Focus

Exempt Organizations
PAC Compliance
Retirement Plans


Bachelor of Science in Accounting
George Mason University