On May 13, 2026, U.S. Treasury finalized Reg. §1.6050K-1(c)(1), which was originally proposed on Aug. 19, 2025. It changes the reporting requirements for partnerships that must file IRS Form 8308 in connection with the sale or exchange of a partnership interest involving §751(a) "hot assets."
Form 8308 Filing Requirements: What Changed
Previously, partnerships were required to file a completed Form 8308, including Part IV, which contains the hot asset computation, by Jan. 31 of the year following the calendar year in which the exchange occurred. The final regulation bifurcates this deadline.
Under the new framework, partnerships are required to file Parts I–III of Form 8308 by Jan. 31. These parts capture identifying information for the transferor and transferee and the date of transfer. Part IV, the substantive hot asset analysis, does not need to be filed until the due date of the partnership's return, including extensions. Notably, these deadlines are not stated in the regulatory text itself; they are reflected in the new Form 8308 instructions.
This change is explicitly pro-taxpayer. The IRS had, in practice, been providing this filing relief administratively for several years. It came in response to consistent feedback from tax professionals that the Jan. 31 deadline did not allow sufficient time to accurately compile and compute the hot asset data.
Why This Change Matters
The finalization of this regulation is a timely reminder of the importance of §751(a) hot asset reporting in the context of the sale of partnership interest and the risks of getting it wrong.
When a partner sells their interest, the partnership must report the amount of hot asset income or loss attributable to the sale both to the IRS via Form 8308 and to the selling partner on its Schedule K-1. These figures must be consistent. If a selling partner disagrees with the partnership's K-1 reporting, the partner's only recourse is to file Form 8082 (Notice of Inconsistent Treatment or Administrative Adjustment Request), which carries a materially elevated risk of IRS examination.
For this reason, buyers and sellers are well-advised to agree on the hot asset allocation figures before closing, then confirm that the partnership will report consistently with that agreed amount. While the partnership is not strictly bound by the parties' agreement, it would be highly unusual and potentially problematic to deviate from it.
Key Takeaways on New Form 8308 Filing Requirements
- Partnerships now have additional time to complete the §751 hot asset analysis, but the underlying computation remains a critical compliance obligation.
- Buyers and sellers should proactively address hot asset allocations in transaction documents and confirm alignment with the partnership before the reporting deadline.
- Inconsistent reporting between a selling partner's return and the partnership's K-1 triggers Form 8082 filing requirements and heightens audit exposure.
Please reach out to a Mowery & Schoenfeld advisor if you would like to discuss how these rules apply to a pending or contemplated transaction.