Jennifer L. Koo, Esq.


Photograph of Jennifer Koo, Esq Partner

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Jennifer Koo is a Partner with Sales Tax Defense LLC. The firm specializes in sales, use, and transaction taxes. Jennifer has been with the firm for over 5 years. Jennifer previously worked at the New York State Attorney General’s Office and brings her experience to her current position.

Areas of Practice

Admitted to Practice Law in:

  • New York
  • Connecticut
  • Federal Court for the Eastern District of New York
  • United States Tax Court
  • United States Supreme Court

Professional Affiliations

  • New York State Bar Association, Member
  • Nassau County Bar Association, Member  – Past Co-Chair of the Young Lawyer’s Committee and Board of Directors, Co-Chair of the Woman in Law Committee and Co-Chair of the Business Law, Tax and Accounting Committee
  • Suffolk County Bar Association, Member


  • Nassau Lawyer, Vol. 59 No. 7, March 2010
    “What to do when you owe New York State Sales and Use Tax”
  • The National Conference of CPA Practitioners Nassau/Suffolk Chapter, Vol. 9 Issue 1, January 2012
    “Now that the Holidays are Over, it’s Time to Pay your Bills”
  • New York State Society of Certified Public Accountants Nassau Chapter, Vol. 57 No. 1, January 2013
    “How to Dispute a Sales Tax Assessment”
  • Nassau Lawyer, Vol.68 No 1, September 2018
    “Down with Quill: The New Precedent in Internet Sales Tax”


  • Juris Doctor
    • Hofstra University School of Law 2009
  • Bachelor of Science Cum Laude in Management and International Business
    • Ithaca College 2006

Interesting Facts About Jennifer

Jennifer was born and raised in Ohio, it is where she became a lover of the outdoors. In her spare time Jenn loves to go rock climbing as well as take her dog (a Shiba Inu mix) on long runs. Jenn is a brown belt in Shotokan Karate.

These days she spends much of her free time with her husband Kevin and young daughter Madelyn.