Updates from the Financial Accounting Standards Board (FASB)
FASB issued Accounting Standards Update (ASU) 2026-03 — Fair Value Measurement (Topic 820): Investment Companies with Equity Securities Subject to Contractual Sale Restrictions — on Sep. 9, 2026. The update requires investment companies specifically (as defined in Topic 946, Financial Services – Investment Companies) to account for contractual restrictions on sales of equity securities when measuring those securities at fair value. This is a change from the previous standard where this was not required. Read more in RSM’s article FASB issues valuation guidance for investment companies.
Adoption of ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, is on the horizon for private companies, which should be considering their plan for adoption before year-end. The private company requirements continue to allow a qualitative rate reconciliation disclosure; however, companies need to ensure they accumulate the required data and perform many of the underlying calculations to comply with the enhanced disclosure requirements. Additionally, companies that have previously disclosed a numerical rate reconciliation table may want to consider whether they will continue to do so after reviewing the new requirements.
ASU 2023-09 also requires additional disaggregated disclosures of income taxes paid (refunded) into its federal, state and local and foreign components, and by jurisdiction if certain thresholds are met. Further disclosures of income tax expense and income (loss) from continuing operations are also required. Discussions with financial statement auditors should be initiated before year-end to avoid delays in the issuance of financial statements. Read more about the requirements under ASU 2023-09 in RSM’s whitepaper: ASU 2023-09-Expanded Income Tax Disclosure Requirements and RSM’s Accounting Brief: ASU 2023-09 Planning Considerations
State tax
Although activity has slowed during the third quarter of 2026, states are continuing to address conformity with OBBBA. Additionally, other items such as Public Law 86-272, state tax rate changes and other routine changes are beginning to resurface. Companies should continue to monitor these tax law changes to ensure any impacts are accounted for in the financial statements in the period of enactment. A detailed discussion on recent state tax law changes, as well as their impacts under ASC 740, can be found in our tax alert: State corporate income tax law changes for the third quarter of 2026.
Global tax compliance updates: OECD Pillar Two and country-specific changes
The following section includes key global tax law updates contributed by RSM’s global teams.
Status of Pillar Two
On Sept. 11, 2026, the OECD/G20 Inclusive Framework released a Pillar Two implementation package consisting of (1) an updated GloBE Information Return (GIR), (2) new administrative guidance addressing explicitly conditional taxes and qualified domestic minimum top-up tax (QDMTT) fiscal-period mismatches, and (3) a legislative peer review framework for evaluating the consistency of local Pillar Two regimes with the GloBE rules. The updated GIR incorporates changes arising from the January 2026 side-by-side package, including permanent safe harbors, related elections, and additional reporting requirements intended to improve consistency and administration across jurisdictions.
The accompanying administrative guidance clarifies that taxes that apply solely because a taxpayer is subject to a foreign income inclusion rule (IIR) or undertaxed profits rule (UTPR) generally are not treated as covered taxes for GloBE purposes. The guidance also clarifies the operation of the QDMTT safe harbor where local financial accounting standards are used and the local fiscal period does not align with the ultimate parent entity's fiscal year. In addition, the OECD released the Terms of Reference and Assessment Methodology for full legislative peer review, establishing a framework under which Inclusive Framework members will assess whether domestic IIR, UTPR, and QDMTT legislation is consistent with the GloBE model rules, commentary, and administrative guidance. Multinational groups operating in jurisdictions that have adopted Pillar Two rules should evaluate whether the guidance affects existing Pillar Two calculations, compliance processes, data gathering requirements, or tax provision assumptions. Companies also should continue to monitor jurisdiction-specific implementation of the guidance, particularly with respect to QDMTTs, the treatment of taxes that may be considered explicitly conditional under the OECD framework and developments arising from the OECD’s legislative peer review process.