Corporate tax

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Although many of the procedural rules for auditing partnerships at the federal level have changed under the Bipartisan Budget Act of 2015 (the “BBA”), some principles—like the effect of actual notice—remain the same. Under the BBA, the IRS proposes partnership-level adjustments in a Notice of Proposed Partnership Adjustment (“NOPPA”) and later finalizes them in a Notice of Final Partnership Adjustment (“FPA”). If the IRS issues the FPA after the statute of limitations expires, the partnership can seek to invalidate it as untimely.

A reviewed Tax Court opinion filed March 9, 2026—Mammoth Cave Property, LLC v. Commissioner, No. 5401-24, 166 T.C. No. 4—shows the limits of “defective notice” arguments when the partnership actually received the NOPPA and participated in the process.

I.          Introduction

On December 15, 2025, the U.S. Department of the Treasury (“Treasury”) and the Internal Revenue Service (the “IRS”) published final regulations (the “Final Regulations”) and proposed regulations (the “Proposed Regulations”) under section 892.[1] The Final Regulations finalize, with modifications…

On June 17, 2025, the Tax Court opinion in AbbVie Inc. and Subsidiaries v. Commissioner of Internal Revenue was issued,[1] holding that the approximately $1.6 billion termination fee AbbVie (a Delaware corporation) paid to its abandoned merger partner Shire plc (an Irish company) was properly an ordinary deductible business…

On January 17, 2025, multiple news outlets and other sources reported the existence of a memorandum circulated by the U.S. House of Representatives Budget Committee to the House Republican Caucus (the “Memorandum”) containing an extensive list of budget proposals that may be considered in connection with the new Congress’s widely expected budget reconciliation legislation. The Memorandum, which is publicly available via link from a number of news outlets,[1] contains approximately fifty pages of proposals covering a wide range of policy areas and enumerating scores of potential specific legislative proposals (along with estimated budget effects in most cases), some of which are seemingly mutually exclusive. Included in the memo are a number of tax-related proposals, including tariff proposals, which are briefly set forth below.

On January 20, 2025, the White House issued a memorandum (the “Memorandum”)[1], announcing that the “Organization for Economic Co-operation and Development (OECD) Global Tax Deal” (the “Global Tax Deal”) has “no force or effect in the United States” and disavowing “any commitments” previously made by the United States…

On June 17, 2024, the IRS announced the formation of a dedicated group in the Office of Chief Counsel specifically focused on developing guidance on partnerships, which is expected to work with a new “passthrough working group” being established in the Large Business and International Division of the IRS. At the same time, Treasury and the IRS launched an attack on a specific partnership strategy involving so-called “basis bump” or “basis shifting” transactions involving related parties through a combination of guidance challenging the substance of such arrangements and declaring such arrangements to be “transactions of interest” that are subject to the strict disclosure requirements of the “reportable transaction” rules.1

On June 20, 2024, the U.S. Supreme Court ruled 7-2 that the so called mandatory repatriation tax under Internal Revenue Code Section 965 (“MRT”) is constitutional. 

Justice Kavanaugh wrote the majority opinion.  Justice Thomas (joined by Justice Gorsuch) dissented.  Justice Barrett (joined by Justice Alito) and Justice Jackson delivered separate…

Introduction

On April 9, 2024, the Department of the Treasury (“Treasury”) and the Internal Revenue Service (the “IRS”) issued two sets of proposed Treasury Regulations related to section 4501, REG-115710-22, which provides guidance on the application of section 4501, and REG-118499-23 (together with REG-115710-22, the…

On January 17, 2024, Senate Finance Committee Chairman Ron Wyden (D-Ore.) and House Ways and Means Committee Chairman Jason Smith (R-Mo.) released a bill, the “Tax Relief for American Families and Workers Act of 2024” (“TRAFA” or the “bill”). All of the provisions in the bill are taxpayer favorable, except…