Kat Gregor represents large financial institutions, multinational corporations and individuals in complex tax controversy matters, including in both dispute resolution and litigation. She has over 25 years of experience advising clients in the private equity and alternative investment industries, including with regard to the formation of new investment management companies, launching new funds and establishing cross-border investment structures.
Gregor represents clients spanning various industries, including financial services, retail, entertainment, energy, technology, communications, biotech and health care, among others. She also advises high-net-worth individuals in resolving inquiries by tax authorities into matters involving estate tax, residency and domicile, and the reporting of foreign and digital assets.
Gregor’s work with the financial services industry includes counseling fintech and other blockchain companies, asset managers (and related investment funds), institutional investors and financial institutions on ongoing tax issues, as well as on disputes with the IRS and other tax authorities.
Known for her innovative approach to solving problems and resolving tax disputes, clients regularly turn to Gregor to achieve favorable negotiated outcomes.
Lawdragon Honors
| Honor | Year | Practice |
|---|---|---|
| The 2026 Lawdragon 500 Leading Global Litigators | 2026 | International Litigation & Arbitration, esp. Tax |
| The 2025 Lawdragon 500 Leading Global Litigators | 2025 | International Litigation & Arbitration, esp. Tax |
| The Inaugural Lawdragon 500 Leading Global Tax Lawyers | 2025 | Tax, Dispute Resolution, Litigation |
| The 2024 Lawdragon 500 Leading Global Litigators | 2024 | International Litigation & Arbitration, esp. Tax |
| Lawdragon 500 Leading Global Litigators | 2023 | International Litigation & Arbitration, esp. Tax |
Her tax controversy and litigation experience, including prior to joining Skadden, includes representing:
- Amgen Inc. in one of the largest transfer pricing cases litigated in the U.S. Tax Court concerning the licensing of complex biopharmaceutical products from the U.S. to Amgen’s Puerto Rico-based subsidiary
- Ivory Investment Management, LP in attaining a full concession by the IRS after filing a petition and before the IRS’ response in Ivory Investment Management, LP v. Commissioner
- Veolia in achieving a complete victory in a pair of cases involving the definition of manufacturing and machinery (one of which was argued before the Massachusetts Supreme Judicial Court) in Veolia v. Board of Assessors of the City of Boston
- a multinational industrial manufacturer in an IRS examination where the IRS asserted a multibillion-dollar adjustment to the company’s accounting method for revenue recognition, achieving a full reversal of the IRS adjustments
- a multinational energy company in reaching a favorable settlement in an administrative dispute regarding the deductibility of related party interest
Gregor’s tax advisory experience, including prior to joining Skadden, includes advising:
- multinational private equity firms on the tax impacts of their operations, including with regard to profits interests and phantom equity plans, third-party investments, transfer pricing and compliance with the OECD’s Pillar II implementation
- fund managers and institutional investors on the launch of new funds, as well as on a variety of alternative investments, including co-investments, funds of one and strategic public equity investments
- a Canadian-based manufacturer on the tax treatment of a restructuring of its U.S. subsidiaries, including filing a claim for refund following the invalidation of regulations implementing the Tax Cuts and Jobs Act of 2017
- The Walt Disney Company in its $1 billion investment in OpenAI as part of a landmark licensing agreement
Gregor maintains an active pro bono practice and has advised human trafficking victims on the tax impacts of settlement awards and other recoveries. Before joining Skadden, she co-founded the tax controversy practice at another leading law firm and was a CPA with a major accounting firm, where she specialized in venture capital and other partnership taxation issues.