Mark L Stone, CPA

Managing Partner of Sales Tax Defense LLC

Greater New York City Area
  1. Sales Tax Defense LLC
  1. Olivier & Associates LLC,
  2. Marcum & Kliegman LLP
  1. Long Island University, C.W. Post Campus
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Mark Stone is the founder and Managing Partner of Sales Tax Defense LLC and leads the Long Island, New York office where he specializes in Sales, Use and Transaction Taxes.

Mark's work as a NY state tax auditor as well as a Tax Manager at several prominent accounting firms over the past 15 years has earned him a reputation as one of the top professionals for multi-state Sales and Use Taxes.

He is frequently invited by various organizations to speak on Sales & Use Tax issues, and serves as an Expert witness testifying in tax court on behalf of clients.

Specialties:Sales and Use Tax, Multi-state Sales and Use Tax, Sales and Use Tax audits, Sales and Use Tax issues and recovery, Complex tax issues and laws, Due Diligence Reviews, Representation before government revenue agencies and auditors, Representation as expert witness in Sales and Use Tax court cases, Representation at Tax Hearings and Bureau of Conciliation and Mediation Conferences


Managing Partner

Sales Tax Defense LLC
– Present (5 years 10 months)

Oversee and assist clients with all aspects of any Sales and Use Tax consulting engagement, sales tax controversy resolution and sales tax assessment problem.


Olivier & Associates LLC
(2 years 9 months)

I was the partner in charge of the Long Island, New York office where I specialized in assisting clients with Sales and Use Tax Audits, Multi-state sales tax consulting and sales tax assessments and collection issues.

Senior Tax Manager

Marcum & Kliegman LLP
(8 years 8 months)

I was the the Tax Manager in charge of the firm's entire Sales and Use Tax Consulting practice, where we assisted clients with any aspect of a sales and use tax problem.


Marcum LLP
(9 years)


Certified Public Accountant

New York State Education Department, License 084123


  • Sales & Use Tax
  • Multi-State Sales Tax
  • Tax Research
  • Tax
  • Tax Returns
  • Accounting
  • Audit Defense
  • Tax Contraversy
  • Offers in Compromise
  • White Collar Criminal...
  • Auditing
  • GAAP
  • CPA
  • Use Tax
  • Sales Tax
  • Tax Advisory
  • Tax Law
  • S Corporations
  • LLC
  • Payroll Taxes
  • IRS
  • Fixed Assets
  • Forensic Accounting
  • Internal Controls
  • Bookkeeping
  • QuickBooks
  • Account Reconciliation
  • Accountants
  • Property Tax
  • Preparation
  • International Tax
  • Financial Statements
  • Corporate Tax Planning
  • Personal Tax Planning
  • Financial Planners
  • SEC filings
  • Business Tax Planning
  • General Ledger
  • US Tax
  • Estate Tax Planning
  • Sarbanes-Oxley
  • Gift Tax
  • Business Valuation
  • Sarbanes-Oxley Act
  • Cash Flow
  • Peachtree
  • State Tax
  • Assurance
  • High Net Worth...
  • See 35+  See less


Long Island University, C.W. Post Campus

M.B.A, Taxation

Graduated with Honors.

Honors & Awards

Publication & Speaking Credits

--Published columns in various media including Beyond the Numbers, Private Investment Forum, New York State Society of CPAs Nassau Chapter Newsletter

--Quoted in various media including Crain's New York Business and Practical Accountant

--The National Business Institute, Speaker

--Nassau Chapter (NYSSCPA) Half-Day State and Local Tax Update, Speaker

--New York Sales and Use Tax for Manufacturers program, Faculty (NBI)

--The Tax Institute at Long Island University (C.W. Post), Speaker

--AccuData Payroll Services Seminar Series, Facilitator

--Key Speaker, Nassau Chapter Half-Day Federal Taxation Conference, Uniondale, NY

--Sales Tax Seminars for Holtz Rubenstein Reminick & Co., Melville and New York City

--Sales Tax Seminars for Raich Ende Malter & Co, East Meadow and New York City

--Key Speaker, Taxware Summit 2006, Las Vegas

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