Litigation & tax controversy lawyers | McDermott Will & Schulte

McDermott Will & Schulte, a global law firm

Tax Controversy & Litigation

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Overview

Our Tax Controversy & Litigation Group brings extensive experience and in-depth knowledge to help clients resolve tax disputes inside and outside of the courtroom.

From the planning stages of a transaction or reorganization to any challenge brought by a taxing authority, our tax controversy and litigation lawyers are advocacy-oriented. We work with corporations, private equity funds, partnerships, and high-net-worth individuals to develop bespoke solutions that minimize risk, protect interests, and achieve the most favorable outcomes. By partnering with clients across diverse industries, including technology, energy, and life sciences, we gain deep insights into their business, enabling our tax team to strategically advise on specific disputes.

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Our areas of focus

Long before a tax audit begins, our lawyers work closely with clients to spot potential issues and avoid tax controversies. We advise on matters related to:

  • Protecting privileges
  • Return filing positions (e.g., uncertain tax positions and reserve analysis)
  • Document retention
  • Tax planning positions for audits

Additionally, we help secure rulings from taxing authorities, such as private letter rulings, technical advice, and other determinations, on various tax matters.

IRS Success: Franchisee Recoups $3 Million With 100% Tax Penalty Abatement

Real-time tax disputes insights

Tax Controversy 360 Blog

Best Law Firms® 2026

National Tier 1 for Litigation and Controversy – Tax

International Tax Review (ITR) Americas Tax Awards 2025

US Tax Disputes Firm of the Year

Best Law Firms, Client Reference

“[The firm] has an excellent understanding of tax law and application to the situations we encounter. They can make complex legal issues understandable and help come to a workable resolution. We rely on the advice we receive extensively.”

Results
  • Represented an oil and gas company against the IRS in a case before the Tax Court involving a specified liability loss carryback and research and development tax credits
  • Advised a US-based petroleum refiner on federal, state, and local tax controversies and litigated federal and state tax disputes
  • Represented a major credit card company with respect to transfer pricing, tax accounting, and foreign tax credit issues in IRS Examinations and IRS Appeals, including with IRS Advance Pricing Agreements
  • Represented a global technology company protesting proposed transfer pricing adjustments and IRS Appeals
  • Represented a petroleum products company before IRS Appeals and Collections with an offer-in-compromise requesting relief based on “doubt as to collectibility” and “effective tax administration”

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Key contacts

Shawn O'Brien

Partner

Houston

Susan E. Ryba

Partner

Chicago

Acquisitions & Restructurings

State & Local Tax

Tax

Tax Structuring