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On May 5, 2026, the Internal Revenue Service (“IRS”) released Revenue Procedure 2026-21 (the “Rev. Proc.”), which reinstates a program under which taxpayers may request private letter rulings (“PLRs”) on “significant issues” arising in certain corporate transactions[1] without asking the IRS to rule on the entire integrated transaction.[2]…

On April 21, 2026, in Liberty Global, Inc. v. United States, the Tenth Circuit held that the economic substance doctrine was “relevant” and applied to deny Liberty Global, Inc. a $2.4 billion deduction and imposed a 40% penalty with respect to a transaction known as “Project Soy”. The Tenth…

Update: The National Taxpayer Advocate has published a blog post urging taxpayers to evaluate whether they have claims for refund based on the recent Abdo and Kwong decisions. Importantly, the Taxpayer Advocate suggests that the argument for penalty and interest relief based on the COVID pandemic disaster declarations is…

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.

Compensation is generally subject to federal income tax and FICA tax when compensation is actually paid to an employee. However, nonqualified deferred compensation (NQDC) may be subject to FICA taxation before federal income taxation under a FICA tax special timing rule. The scope of NQDC subject to FICA taxation is…

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 May 28, 2025, in Soroban Capital Partners LP v. Commissioner (T.C. Memo 2025-52) (“Soroban II”), the Tax Court held the active role of limited partners in a fund manager caused them to fail to qualify as “limited partners” for purposes of section 1402(a)(13) and, therefore, the limited…

Companies are increasingly allowing their chief executive officers and, in certain circumstances, other executives to use corporate jets (which may be chartered flights or fractionally or fully owned aircraft) for personal use due to various reasons. Although this benefit may be a relatively small percentage of an executive’s overall compensation…

  1. Introduction

On April 24, 2024, the U.S. Department of the Treasury (“Treasury”) and the Internal Revenue Service (the “IRS”) issued final regulations[1] on the definition of “domestically controlled” real estate investment trusts (“REITs”) (the “Final Regulations”). The Final Regulations retain…

I. Executive Summary

On February 15, 2024, the IRS and Treasury issued a supplemental notice to a prior notice from December 2022, to correct a petition requesting that the Superfund Chemical Tax apply to polyphenylene sulfide. While the supplemental notice is narrow in scope, the IRS and Treasury have requested…