Check out our summary of significant Internal Revenue Service (IRS) guidance and relevant tax matters for August 12, 2025 – August 20, 2025.

IRS guidance

August 15, 2025: The IRS issued Notice 2025-42, providing guidance consistent with Executive Order 14315, Ending Market Distorting Subsidies for Unreliable, Foreign-Controlled Energy. This notice specifically provided guidance on when construction of an applicable wind facility or solar facility has begun, which determines whether that facility is subject to the credit termination provisions added to Internal Revenue Code §§ 45Y and 48E by §§ 70512 and 70513 of Public Law 119-21, also known as the One Big Beautiful Bill Act.

August 18, 2025: The IRS issued Notice 2025-43, providing guidance on the corporate bond monthly yield curve, corresponding spot segment rates in Code § 417(e)(3), and the 24-month average segment rate in Code § 430(h)(2). This notice also provides guidance on the interest rate on 30-year Treasury securities in Code § 417(e)(3)(A)(ii)(II) for plan years commencing prior to 2008, as well as the 30-year Treasury weighted average rate in Code § 431(c)(6)(E)(ii)(I).

August 18, 2025: The IRS issued Revenue Ruling 2025-17, providing prescribed rates for federal income tax for September 2025, including:

• The short-, mid-, and long-term applicable federal rates (AFRs) for purposes of Code § 1274(d).
• The short-, mid-, and long-term adjusted AFRs for purposes of Code § 1288(b).
• The adjusted long-term rate and the long-term tax-exempt rate from Code § 382(f).
• The appropriate percentages for determining the low-income housing credit under Code § 42(b)(1) for buildings placed in service during September 2025.
• The federal rate for determining the present value of an annuity, an interest for life, a term of years, or a remainder or a reversionary interest under Code § 7520.

August 19, 2025: The IRS issued Notice 2025-45, announcing its intent to issue proposed regulations under Code §§ 897(d) and (e), which would modify the application of Treas. Regs. §§ 1.897-5T and 1.897-6T to certain transactions involving the transfer of US real property interests. The proposed regulations would also revise rules applying to inbound asset reorganizations in Code § 368(a)(1)(F). This notice also announced the US Department of the Treasury and IRS’s intent to issue proposed regulations, revising Treas. Reg. § 1.368-2(m) and clarifying that qualification as a potential F reorganization under § 368(a)(1)(F) would not be affected by a disposition of stock.

August 20, 2025: The IRS issued Notice 2025-44, requesting comments on certain dual consolidated loss (DCL) rules and announcing its intent to issue proposed regulations removing.

• The disregarded payment loss rules in Treas. Reg. § 1.1503(d)-1(d).
• Recent modifications to the DCL rules in Code § 1503(d) as they relate to the deemed ordering rules under Trea. Reg. § 1.1503(d)-3(c)(3).

The proposed regulations would also extend the transition relief related to applying the DCL rules in Code § 1503(d) to certain taxes covered by Pillar Two as described in “Tax Challenges Arising from the Digitalisation of the Economy – Global Anti-Base Erosion Model Rules (Pillar Two).” (See footnote 1 in Notice 2025-44 for links to these rules).

The IRS also released its weekly list of written determinations (e.g., Private Letter Rulings, Technical Advice Memorandums, and Chief Counsel Advice).