This bill, known as the "Basis Shifting is a Rip-off Act," aims to modify the Internal Revenue Code's partnership rules to address and prevent tax avoidance strategies involving basis-shifting transactions among related parties. It introduces new provisions that mandate gain recognition in specific partnership distributions and transfers of partnership interests, particularly when related individuals or entities are involved. Specifically, the bill amends Section 731 to require partners to recognize gain when an "applicable partnership" distributes property, leading to an increase in the basis of remaining partnership assets. Similarly, the partnership itself must recognize gain if a distribution to a partner results in an increased basis for the distributed property. An "applicable partnership" is defined as one where two or more partners are related persons, though a small business exception applies for partnerships meeting certain gross receipts tests, unless they are tax shelters or have previously failed the test. Furthermore, the legislation modifies Section 743 to limit basis increases for partnership property in "applicable transfers" of partnership interests to the amount of gain recognized on the transfer. It also makes certain basis adjustments under Section 734 mandatory for applicable partnerships when a distribution decreases the basis of partnership property. These changes are designed to close loopholes that allow related parties to manipulate asset bases for tax advantages. To enforce these new rules, the bill amends Section 6662 to include "related-party partnership distribution understatements" as a type of understatement subject to accuracy-related penalties. The penalty rate for such understatements is increased from 20 percent to 40 percent. These amendments will apply to distributions and transfers occurring after June 11, 2025, without inferring prior economic substance for these transactions.