Tax Insight

Tax Court analyzes application of economic substance doctrine

Insight
5 minute read
March 05, 2026

What happened?

The Tax Court on February 23, 2026, in Otay Project LP v. Commissioner, T.C. Memo. 2026-21 (Otay), disallowed a $714 million deduction stemming from a Section 743(b) basis adjustment that arose from a series of transactions among related parties that the court described as “engineered.” The court held that the transactions lacked economic substance and that the Section 743(b) basis adjustment was improperly computed.

Why is it relevant?

The Tax Court analyzed whether the transactions produced any meaningful economic effects apart from the creation of tax benefits. The Tax Court evaluated both (1) the objective nature of the transaction (whether it had economic substance beyond tax benefits) and (2) the subjective motivation of the taxpayer (whether the taxpayer had a non-tax business purpose for the transaction).

The Tax Court disallowed the imposition of a 20% accuracy-related penalty under Section 6662(a) on the grounds that the partnership reasonably relied on the advice of its advisors.

The Otay decision highlights the heightened scrutiny that courts might apply in evaluating whether transactions between related parties have economic substance. Additionally, the decision represents a victory for the IRS in its recent efforts to challenge partnership basis adjustment transactions that it considers abusive.

Actions to consider

Taxpayers should continue to evaluate the application of the economic substance doctrine to transactions that produce significant tax benefits for partners in a partnership.