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TREAS/IRS RIN: 1545-BP58 Publication ID: Spring 2025 
Title: Subchapter S Statutory Changes and Calculations 
Abstract:

The proposed regulations would revise existing regulations under subchapter S to provide certainty regarding several issues, including (i) the treatment of electing small business trusts (ESBTs) and mortgage pools under subchapter S, as well as (ii) the calculation of a shareholder’s basis and the allocation of accumulated adjustments account (AAA). These regulations also will update the existing regulations under subchapter S to reflect statutory changes.

 
Agency: Department of the Treasury(TREAS)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
EO 14192 Designation: Other 
CFR Citation: Not Yet Determined     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 26 U.S.C. 7805    26 U.S.C. 1361 et seq.   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  05/00/2026 
Additional Information: REG-125206-19 (NPRM) Drafter attorney: Iris Chung (202) 317-4276 Reviewer attorney: Richard T. Probst (202) 317-5044 Treasury attorney: Cathy Hughes (202) 622-9407 and Colin Campbell (202) 622-2721 CC:PT&E
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: Businesses  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Iris Chung
General Attorney (Tax)
Department of the Treasury
Internal Revenue Service
1111 Constitution Avenue, NW, Room 5107,
Washington, DC 20224
Phone:202 317-4276
Fax:855 591-7865
Email: iris.t.chung@irscounsel.treas.gov