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Samantha Greenbaum

CPA, MAcc Partner, Team Co-Leader, E-Commerce

Get to Know Me

Sam Greenbaum is a Partner with over 11 years of experience in public accounting, focusing primarily on advising businesses in the technology and emerging growth sector.

She is the E-Commerce Services Team Leader, which focuses on providing compliance and business strategy for companies with online B2C and B2B business models. She provides tax consulting on a wide variety of related tax issues, including diligence-ready assessment, secondary transactions, qualified small business stock and state sales tax and international taxes. Sam also specializes in private and publicly held multistate and multinational companies, as well as ASC 740 Tax Provisions and Corporate Tax Compliance.

As a member of the Firm’s Women’s Health & Wellness Practice, Sam is passionate about assisting businesses that focus on women’s health to ensure women are well-equipped with the tools and technology they need to lead healthy lifestyles.

Industry Expertise

Service Expertise

Learn More About My Story

Learn more about my professional experience and how I spend my time outside the firm.

Education:

  • B.Sc, Accounting, University of Florida
  • Master of Accounting, concentration in Tax, University of Florida

Professional Affiliations:

  • Member, American Institute of Certified Public Accountants (AICPA)
  • Member, New York State Society of Certified Public Accountants (NYSSCPA).

Sam is a dedicated mentor and passionate about helping women grow their careers and succeed in the profession. She is a founding member of Withum’s Parents Network which supports caregivers throughout the firm. Sam is also a teaching fellow, ensuring Withum’s tax professionals are up to date on current tax regulations and Firm processes.

As a working mom, Sam enjoys spending time with her family when she isn’t at the office. She loves golden retrievers, cooking and enjoying new food and books, and staying active.

Authored Insights

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2026 deadlines
Year-End Tax Planning for Technology Companies: Key Dates You Should Know

As tech companies enter a new tax year, planning ahead for filing deadlines is essential, especially for those managing equity compensation, multi-state operations and rapid expansion. Withum’s Technology and Emerging Growth Services Team is outlining the key dates and considerations tech CFOs and CEOs should prepare for now. Key Dates for Technology Companies 1. Payroll…

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online payment, payment successful
AI at the Checkout: How ChatGPT Instant Checkout Is Reshaping Shopping and Payments

OpenAI has just taken a bold step into the future of online shopping with the launch of Instant Checkout, a new feature that allows users to purchase products directly through ChatGPT. This opens a new avenue for e-commerce growth while representing a structural shift in how payments are initiated, processed, and safeguarded in an AI-driven…

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business stock
Planning to Sell Your “C” Corporation Stock?

Did you know that you may be eligible to exclude 100% of the gain on the sale? If your “C” Corporation stock qualifies as Qualified Small Business Stock (“QSBS”), you may be eligible to eliminate paying tax on a portion or possibly all of your gain on the sale. This article will explain the general…