Photo of Jennifer Weidler  Karpchuk

Jennifer Weidler Karpchuk

Senior Counsel


Temple University School of Law, J.D., 2009

University of Delaware, B.A., cum laude, 2006


Named as a "Super Lawyers Rising Star" for 2016, 2017, 2018 and 2019

Named as a "Top Lawyer in Tax" by Main Line Today for 2018 and 2019

Bar Admissions


New Jersey


Jennifer Weidler Karpchuk specializes in consulting with, advising, and representing clients regarding issues in all aspects of state and local tax compliance and litigation.  She is an author and frequent speaker nationally on the issue of nexus in a post-Wayfair world.  She regularly counsels clients on their potential nexus for sales and use tax purposes, as well as income and gross receipts tax purposes - ensuring compliance in a complex area. Ms. Karpchuk also has significant experience with the following: 

  • Challenging audit determinations and real estate assessment decisions;
  • Obtaining Rulings;
  • Seeking refunds from state and local governments;
  • Handling administrative appeals at both the state and local levels;
  • Litigating unresolved disputes in state and local courts;
  • Handling post-trial appeals at all appellate levels; and
  • Reducing interest and penalties associated with past due taxes through the use of state and local amnesty, voluntary disclosure programs and administrative appeals. 

In addition, she handles transactional planning for clients and has experience:

  • Advising clients on the tax implications of pending and past transactions;
  • Planning for and mitigating tax burdens;
  • Maximizing available tax opportunities or credits;
  • Reviewing nexus and developing strategies to minimize exposure; and
  • Drafting legal opinions.

Ms. Karpchuk is a frequent speaker and contributor to the firm's State and Local Tax Blog.  Additionally, she writes a quarterly article for State Tax Notes, and is co-author of The Legal Intelligencer’s Pennsylvania Tax Handbook and the Pennsylvania Chapter of the American Bar Association’s Property Tax Deskbook.

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Positions Held

  • Philadelphia Tax Section State and Local Tax Committee – Chair 2020-2022
  • Philadelphia Tax Section State and Local Tax Committee – Secretary 2018-2020
  • Pennsylvania Tax Section – Secretary 2018-2020
  • ABA State and Local Tax Committee, Sales & Use Tax Subcommittee – Co-chair 2017-2019
  • ABA State and Local Tax Committee, Miscellaneous Taxes Subcommittee – Co-chair 2017-2019

Seminars and Presentation

  • Tax Executives Institute, “Mid-Atlantic SALT Update” November 20, 2019

  • Council on State Taxation, “Local Taxes and New Frontiers Including Constitutional Restraints”, October 23, 2019
  • Philadelphia Bar Association, “The Way Forward After Wayfair”, May 29, 2019
  • Wilmington Tax Group, "The Aftermath of Wayfair", May 21, 2019
  • Strafford, Procurement Cards and Sales Tax Compliance: Mastering the Complexities, March 21, 2019
  • American Bar Association and Institute for Professionals in Taxation, "Apportionment: Deep Dive into Determining Where the Benefit is Received", March 12, 2019          
  • Tax Executives Institute, "Mid-Atlantic SALT Update", November 14, 2018
  • Council on State Taxation, "What's the Future for COP", October 25, 2018
  • Philadelphia Bar Association, "Quill is No More: State Tax Nexus After Wayfair", July 24, 2018
  • Greater Philadelphia Chamber of Commerce, "Tackling Tax Law", Philadelphia, PA, May 9, 2018
  • ABA/IPT – Advanced State and Local Tax Conference, “Nexus Update: From the Status of Quill to Recent Legislative Activity,” New Orleans, LA, March 21, 2018
  • ABA/IPT - Advanced Income Tax Conference, "You May be a (Tax Exempt) Manufacturer Under New York Law and Don’t Even Know It!?, New Orleans, LA, March 19, 2018
  • TEI Seminar – PA Tax State Update, November 29, 2017

Media Mentions and Interviews



Seminars & Presentations



  • “Philadelphia’s Beverage Tax: A Sweet Victory?” State Tax Notes, November 12, 2018
  • "Hashing out rates Taxing marijuana without extinguishing it", Accounting Today, November 6, 2018
  • "Farewell Physical Presence: Was the U.S. Supreme Court’s Decision Way Off, or Way…Fair?" ABA Tax Times, Aug. 3, 2018

  • "Life After Physical Presence: Implications for Pennsylvania Post-Wayfair" State Tax Notes, Aug. 6, 2018                                                                  

  • "Does Pennsylvania’s Bonus Depreciation Disallowance Violate Uniformity?” State Tax Notes, Mar. 19, 2018
  • “Fireside Chat with Pennsylvania Revenue Secretary C. Daniel Hassel,” State Tax Notes, Jan. 22, 2018
  • “Hashing Out SALT Issues Related to Pennsylvania’s Legalization of Medical Marijuana,” State Tax Notes, Nov. 13, 2017
  • “Pennsylvania Proposes Remote Seller Bill, but Is It Effective?” State Tax Notes, June 12, 2017

Blog Posts