Four Cost Accounting Standards came off the books on August 7, when the Office of Management and Budget's Cost Accounting Standards Board put into effect a final rule conforming CAS 404, 408, 409, and 411 to Generally Accepted Accounting Principles. The rule, published July 8 at 91 FR 42139, wholly rescinds CAS 408, which governed accounting for costs of compensated personal absence, and CAS 411, which governed accounting for acquisition costs of material. It also strikes most provisions of CAS 404, covering capitalization of tangible assets, and CAS 409, covering depreciation of tangible capital assets. The scale is substantial: the rule rescinds four of the nineteen current standards in whole or in part, eliminates 68 of the 72 individual requirements those four standards contained, and removes more than 10,000 words of regulatory text.
Background
The Cost Accounting Standards impose uniform cost measurement, assignment, and allocation rules on contractors holding covered negotiated government contracts. They sit alongside GAAP, the accounting framework that governs commercial financial reporting, and the two systems have long overlapped in ways that forced contractors to maintain duplicative compliance documentation for requirements that produced substantially the same accounting outcomes. Many of the rescinded provisions had remained essentially unchanged for over 50 years while GAAP evolved underneath them.
Congress directed the Board, at 41 U.S.C. 1501(c), to rely on commercial accounting standards to the maximum extent practicable and to conform CAS to GAAP where practicable, and the Board has been executing that mandate through a series of rulemakings. The final rule quotes the Senate Armed Services Committee's rationale for pushing conformance: the committee worried that the standards "favor incumbent defense contractors and limit competition by serving as a barrier to participation by non-traditional, small business, and commercial contractors." The Board frames the rescissions as deregulatory in exactly that spirit.
The Board issued a Notice of Proposed Rulemaking before finalizing the rescissions, and its analysis concluded that the four standards overlapped with GAAP to the point where GAAP standards "may be applied reasonably as a substitute for CAS to support contract cost and pricing." In the Board's judgment, government-unique requirements for capitalizing assets, depreciating them, accruing paid-absence costs, and measuring material acquisition costs no longer earned their compliance cost when commercial accounting rules already compel comparable treatment.
Key Details
The rule's architecture is rescission with targeted preservation. CAS 408 and CAS 411 disappear entirely. CAS 404 and CAS 409 lose most of their provisions, but the Board retained four requirements it described as "necessary to protect the Government's interests": CAS 404-50(d)(1), CAS 409-50(e)(5), CAS 409-50(j)(1), and CAS 409-50(j)(4). Rather than leave those provisions stranded inside hollowed-out standards, the Board relocated them into a new paragraph of CAS 405 — 9904.405-40(g) — the standard governing accounting for unallowable costs, which survives the rulemaking and now carries asset-accounting and depreciation requirements well beyond its original unallowable-cost scope. The result is that the protections remain enforceable without the surrounding standards remaining on the books.
Transition mechanics received their own attention. A new exemption at 48 C.F.R. 9903.201-9(b) expressly shields cost accounting practice changes directly associated with the conformance of CAS 408 to GAAP from contract price and cost adjustments. That matters because a practice change under CAS normally triggers a cost impact process and potential price adjustments on covered contracts; the exemption ensures contractors moving off CAS 408's requirements do not owe the government a price adjustment for aligning with GAAP after the standard's removal. The exemption carries a deadline of its own: qualifying changes must be disclosed and made during the contractor's fiscal year directly following the rule's effective date. Beyond that carve-out, the Board stated it expects contractors will continue following their existing practices, since GAAP-conforming practices should already satisfy what remains.
Crowell & Moring's Government Contracts Legal Forum, in a July 13 analysis by Erin Rankin, walked through the retained provisions, the CAS 408 exemption, and the August 7 effective date. That date arrived thirty days after publication — a short runway by the standards of cost accounting rulemakings.
What It Means for Contractors
The immediate compliance burden falls on documentation rather than accounting mechanics. Contractors with disclosure statements on file describe their practices by reference to the rescinded standards, and those descriptions now point at provisions that no longer exist. Disclosure statements, cost accounting policy manuals, and pricing narratives all need updates explaining how GAAP-based practices satisfy the surviving requirements, including the four provisions now living in CAS 405. Contractors that leave stale CAS 404, 408, 409, and 411 references in place invite audit questions about whether their documented practices match their actual ones.
The CAS 408 exemption deserves a close read before any practice change. Its protection extends to changes "directly associated" with the conformance — a contractor that uses the transition as an occasion to make broader compensated-absence accounting changes may find the additional changes fall outside the exemption and back into the ordinary cost impact process, and the fiscal-year window puts a clock on even the qualifying ones. Segregating rescission-driven changes from discretionary ones in internal documentation will make that boundary defensible later.
Government auditors face their own adjustment. Compliance testing against the four standards has been a fixture of CAS coverage audits, and that work now shifts toward evaluating whether GAAP-based practices support contract cost and pricing and whether the relocated CAS 405 provisions are being observed. Contractors should expect a transition period in which audit teams and contractor accounting staffs are both recalibrating to the new baseline, and should paper their positions accordingly, keeping workpapers that trace each surviving requirement to the practice that satisfies it.
The larger signal is directional. The Board has now demonstrated it will eliminate standards outright when GAAP covers the ground, not merely trim them. Contractors maintaining long-term compliance infrastructure — training programs, disclosure statement templates, cost impact modeling tools — should build in the assumption that the CAS framework will keep contracting toward the provisions that have no commercial analogue. The four standards rescinded on August 7 are unlikely to be the last candidates examined under the conformance mandate, and the pattern of preserving government-protective fragments inside surviving standards offers a template for how future rescissions will look. For now, the practical task is narrower: reconcile the paperwork to the new rulebook before the next audit cycle finds the gap.
