This bill, titled the "Preventing Abusive Routine Tax Nonsense Enabled by Rip-offs Shelters and Havens and Instead Promoting Simplicity Act" or the "PARTNERSHIPS Act," proposes extensive amendments to the Internal Revenue Code of 1986 concerning partners and partnerships. Its primary goal is to curb tax avoidance strategies, simplify certain rules, and ensure that partnership transactions and allocations accurately reflect economic substance. The legislation introduces several significant changes impacting how income, gains, and losses are allocated and taxed within partnerships.

A key provision mandates a consistent percentage method for determining distributive shares for "covered partners" in "covered partnerships," particularly those involving controlled groups, to prevent income shifting. It also introduces a "deemed transfer" rule for covered partners whose liquidation interests exceed their net equity, treating such excess as a taxable event. Furthermore, the bill requires the use of the remedial method for allocating built-in gains and losses on contributed property and extends these rules to revalued property, such as upon disproportionate contributions or distributions.

The legislation eliminates the 7-year time limitation for taxing precontribution gains under Sections 704(c)(1)(B) and 737, meaning these gains can be recognized indefinitely. It also repeals Section 736, which provided special rules for payments to retiring partners or deceased partners' successors, instead treating them as partners until their interests are fully liquidated. These changes aim to simplify the treatment of partner exits and ensure more consistent tax outcomes.

The bill significantly alters the treatment of partnership debt by generally requiring all partnership liabilities to be allocated based on each partner's share of partnership profits, with specific exceptions for bona fide indebtedness to related parties. Crucially, it limits the optional basis adjustment election (Section 754) to qualified small business partnerships. For larger partnerships, basis adjustments upon the transfer of an interest (Section 743) or distribution of property (Section 734) become mandatory, unless specific exceptions apply.

For high-income individuals, the bill expands the Net Investment Income Tax (NIIT) to include all trade or business income, removing previous exceptions based on material participation. This applies to individuals with modified adjusted gross income exceeding $400,000 ($500,000 for joint filers). Finally, the bill codifies an anti-abuse rule, granting the Secretary of the Treasury explicit authority to recast, disregard, or modify partnership transactions that lack economic substance or a substantial non-tax purpose, reinforcing the principle that tax consequences must reflect economic reality.