IRS issues guidance on CAMT, remittance tax, housing credits, and disaster relief

Internal Revenue Bulletin 2025-43

The IRS released Internal Revenue Bulletin 2025-43 summarizing final rules, notices, and procedures issued through October 20, 2025.

This edition addresses corporate alternative minimum tax (CAMT) implementation, new excise-tax deposit relief, opportunity-zone revisions under the One Big Beautiful Bill Act (OBBBA), and low-income housing credit compliance.

It also provides filing relief for taxpayers affected by terrorist actions in Israel during 2024–2025.

Why It Matters

These items update tax compliance rules for corporations, housing developers, and remittance-service providers while extending relief for individuals and businesses in designated disaster or conflict areas.

Key Facts

• Publication date: October 20, 2025

• Effective laws cited: Internal Revenue Code (1986), Public Law 119-21 (OBBBA 2025)

• Parts included:

  • Part I – 1986 Code/Treasury Decisions

  • Part II – Treaties and Legislation

  • Part III – Administrative, Procedural, and Miscellaneous

  • Part IV – Items of General Interest

Major Items in This Issue

1. T.D. 10034 – Interest capitalization for improvements

• Final regulations remove the “associated property” rule and revise the definition of “improvement.”

• Affects taxpayers who improve real or tangible personal property that constitutes designated property.

• Effective October 2, 2025.

2. T.D. 10036 – Average income test for Low-Income Housing Credit

• Establishes recordkeeping and reporting requirements for projects electing the average-income test under § 42.

• Clarifies correction periods, agency flexibility, and small-entity impact analysis.

3. Notice 2025-46 – Corporate Alternative Minimum Tax guidance

• Interim rules explain CAMT computation for corporate reorganizations, bankrupt entities, and consolidated groups.

• Includes examples for discharge-of-indebtedness income and attribute adjustments.

4. Notice 2025-50 – Opportunity Zones and rural-area definition

• Implements OBBBA § 70421(c), reducing the substantial-improvement threshold for property in zones entirely within rural areas from 100% to 50%.

• Clarifies how “rural area” is defined under amended § 1400Z-2.

5. Notice 2025-53 – Relief for taxpayers affected by 2024-25 terroristic action in Israel

• Grants affected taxpayers until September 30, 2026, to complete postponed time-sensitive filings and payments.

• Issued under § 7508A after Treasury confirmed the event as a “terroristic action” under § 692(c)(2).

6. Notice 2025-55 – Excise-tax deposit relief

• Suspends penalties under § 6656 for remittance-transfer providers failing to deposit the new § 4475 excise tax during the first three quarters of 2026.

• Ensures eligibility for the deposit safe-harbor rules under 26 CFR § 40.6302(c)-1(b)(2).

Outcome

The Bulletin consolidates six new pieces of regulatory and administrative guidance, marking the continued rollout of the CAMT framework, housing-credit modernization, and global-event tax relief programs.

The Takeaway

IRS Bulletin 2025-43 shows how 2025 tax policy centers on implementing OBBBA-era reforms, coordinating CAMT rules, and providing responsive relief for domestic and international disruptions.

Citations

• T.D. 10034 – Interest Capitalization Regulations (26 CFR Part 1).

• T.D. 10036 – Low-Income Housing Credit Average Income Test Regulations.

• Notice 2025-46 – Corporate AMT Interim Guidance.

• Notice 2025-50 – Opportunity Zones and Rural Areas Definition.

• Notice 2025-53 – Relief for Taxpayers Affected by Terroristic Action in Israel.

• Notice 2025-55 – Remittance Excise Tax Deposit Relief.