Skip to main content
Skip to main content

100% Partners Ranked by Best Lawyers or Super Lawyers

For more than 75 years, Kostelanetz LLP has built a global reputation as a law firm of choice for clients facing high-stakes controversies and negotiations with government agencies.

Practice Areas

The firm’s practice is comprised of criminal, regulatory, and civil litigation matters. The firm’s clients have included Fortune 500 corporations, closely-held corporations, securities traders, investment advisers, public officials, and well-known individuals in the world of business as well as the arts and entertainment industry. In addition, the firm regularly represents clients in their estate planning and wealth management matters.

Civil Tax Controversies
& Trials

Criminal Tax Investigations & Prosecutions

White-Collar Criminal Defense & Government Investigations

International Tax Controversies

Estate and Tax Planning – Estate and Trust Administration

Internal Investigations

Tax Promoter Audits and Investigations

Civil Dispute Resolution – Complex Commercial Litigation

Government Procurement & Contracting

Appellate Litigation

Transactional Tax Planning

Voluntary Disclosures

Kostelanetz LLP nyc skyline

Globally Recognized

 

Kostelanetz LLP attorneys have unparalleled experience in tax controversy, tax fraud, government investigations, and white-collar criminal defense. Important parts of the firm’s practice also include tax and estate planning, commercial litigation, and government procurement and contracting. 

Results Oriented

 

Kostelanetz LLP and its attorneys have been honored and recognized for their skill and work by major, independent national and international legal rankings agencies, including Chambers USA, The Legal 500, Best Lawyers, and Super Lawyers.

Kostelanetz LLP dc supreme court

Knowledge Base

Blog topics covering Inbound Marketing, Responsive Web Design, lead generation, UX, and SEO

Kostelanetz Files Appeal to Overturn U.S. Tax Court Ruling Denying Widow’s Innocent Spouse Relief

Kostelanetz attorneys recently asked the Fourth Circuit to reverse and remand a U.S. Tax Court ruling that denied a request for innocent spouse relief.

Megan L. Brackney Quoted in Law360 on Top Federal Tax Cases in Second Half Of 2025

Kostelanetz attorney Megan L. Brackney was quoted in a Law360 article titled “Top Federal Tax Cases To Watch In 2nd Half Of 2025.”

Melissa Wiley Quoted in Journal of Accountancy on Top Tactics for Dealing With the IRS

Kostelanetz partner Melissa Wiley was quoted in a Journal of Accountancy article about  top tactics for dealing with the IRS.”