Tax Law Update Archive

How to use a dated note

Check the document date before you check the headline. Publication 5653 is examiner guidance revised in February 2025. Public Law 119-21 is a statute enacted July 4, 2025. Notice 2026-11 is interim IRS guidance on that statute. A study report that cites only the February guide for a 2026 bonus rate is using a document that predates the law.

Check the host. Statute notes point at congress.gov or LII. IRS notes point at irs.gov PDFs. California conformity notes point at the Franchise Tax Board page that was opened. A secondary firm alert is not an archive entry unless this library later opens the official page and upgrades the row.

Check what the note does not cover. This archive does not list every revenue ruling in Publication 5653’s case tables. It does not list state departments of revenue other than the California FTB page that was opened. It does not list private letter rulings. It does not convert a dated note into advice about a particular closing.

2025 statutes and examiner guidance

February 6, 2025 (posted February 2025) — IRS Publication 5653, Cost Segregation Audit Techniques Guide, revised. Examiner guidance for study approaches, quality-study elements, case tables, and seven Chapter 7 industry matrices. The PDF states it is not an official pronouncement of law and cannot be cited as authority. The IRS Audit Techniques Guides index lists the publication date as 02/2025 and notes that guides are current only through their publication date. Because the revision predates Public Law 119-21, bonus-depreciation sentences inside the guide are not this library’s current-law text.

July 4, 2025 — Public Law 119-21, 139 Stat. 72, the reconciliation act the IRS describes as commonly known as the One, Big, Beautiful Bill Act. Section 70301 made 100 percent additional first-year depreciation permanent for qualified property acquired after January 19, 2025, removed the pre-2027 placed-in-service deadline, and added the §168(k)(10) transition election of 40 percent (60 percent for certain longer-production-period property and aircraft) for the first taxable year ending after January 19, 2025. Section 70301(c)(4) provides that property is not treated as acquired after the date a written binding contract is entered into. Section 70306 raised the statutory §179 dollar limit and phase-out threshold for property placed in service in taxable years beginning after December 31, 2024, and changed the inflation-indexing base year. Section 70307 added §168(n) qualified production property. Section 70434 later in the same law added qualified sound recording productions to §168(k) for productions commencing in taxable years ending after July 4, 2025.

2025–2026 IRS documents

Rev. Proc. 2025-23 — list of automatic accounting-method changes, later modified by Rev. Proc. 2026-32. Designated change number 7 is the usual impermissible-to-permissible depreciation change; designated change number 8 is permissible-to-permissible; other change numbers used on CostSeg SI tax-law pages were read from that list and are not repeated as a complete catalog here. Form 3115 instructions (Rev. December 2022) predate this list and are not the source for those numbers.

Rev. Proc. 2025-32 — 2026 inflation adjustments. Section 4.24 states a 2026 §179 limitation of $2,560,000, reduced dollar-for-dollar above $4,090,000, and a sport-utility-vehicle cap of $32,000. The procedure also states 2025 statutory amounts of $2,500,000 and $4,000,000. Those are annual figures. They expire when the next inflation procedure says they expire.

Notice 2026-11 (IRB 2026-06) — interim guidance on additional first-year depreciation after Public Law 119-21. The notice applies Treas. Reg. §1.168(k)-2 with January 19, 2025, and January 20, 2025, substitutions, describes binding-contract and self-constructed-property rules, describes the §168(k)(10) election, and states that proposed regulations are forthcoming. Taxpayers may rely on sections 3 through 5 only if they follow those sections in their entirety for all eligible property. Proposed regulations had not been located as published when this archive note was written.

Notice 2026-16 — interim guidance on qualified production property under §168(n). Elective 100 percent allowance for a designated portion of nonresidential real property used as an integral part of a qualified production activity. Construction must begin after January 19, 2025, and before January 1, 2029. The property must be placed in service after July 4, 2025, and before January 1, 2031. Offices, administrative services, lodging, parking, sales, research, software development, and engineering are excluded. This is not §168(k) and is not a cost-segregation class.

Publication 946 (2025) and Publication 527 (2025) — annual IRS publications opened for MACRS tables, Appendix B class lives, bonus-depreciation narrative, §179 narrative, and residential-rental rules. Publication 946’s 2025 edition already describes the restored 100 percent rate for later acquisitions and the phase-down for earlier ones. Publication 527 remains the dwelling-unit explainer next to §168(e)(2).

State note opened for this archive

2025 Instructions for Form FTB 3885, California Franchise Tax Board. The instructions state that California law does not conform to IRC §168(k), does not conform to the 100 percent allowance for qualified production property under §168(n), and does not conform to the enhanced federal §179 dollar limits. For California corporate purposes the instructions state a $25,000 §179 maximum and a $200,000 phase-out. Other states are omitted until an official state page is opened. Federal classification work and California taxable income can therefore diverge in the same year.

What this archive is not

It is not a news feed, a legislative tracker, or a promise that CostSeg SI will rewrite pages the day a notice posts. It is not individualized advice. It is not complete IRS guidance history. Revenue rulings that appear only as citations inside Publication 5653 stay on the research register as PARTIAL rows and are not promoted into this dated list.

It is not expert review. Adding a date to this archive does not mark any article reviewed, edited, or client-approved. Super Intelligence screens remain proposed. A CPA who needs a 2026 filing position should open the statute, the notice, and the return instructions, not this list alone.