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SECTION 1. PURPOSE

Internal Revenue Bulletin 2008-30 · 2026-10-03 edition · updated 2026-10-04 · United States

The Internal Revenue Service traditionally viewed rolling-average inventory valuation as a method of accounting that does not clearly reflect income, especially when inventory is held for several years or costs fluctuate substantially. See Rev. Rul. 71–234, 1971–1 C.B. 148, and Rev. Rul. 77–480, 1977–2 C.B. 186. However, many industries consider the rolling-average method an accurate estimate of costs and use a rolling-average method for financial statement purposes. The Service recognizes that using a rolling-average for financial statement purposes can produce an accurate approximation of costs. Therefore, this revenue procedure announces that the Service generally will view a rolling-average method that is used to value inventories for financial accounting purposes as clearly reflecting income for federal income tax purposes. However, if inventory is held for several years or costs fluctuate substantially, a rolling-average cost method may or may not clearly reflect income, depending on the particular facts and circumstances. This revenue procedure provides two safe harbors under which a taxpayer’s financial accounting rolling-average method will be deemed to clearly reflect income for federal income tax purposes. If a taxpayer does not use a rolling-average method for financial accounting purposes then the rolling-average method may not accurately determine costs or clearly reflect income for federal income tax purposes.

This revenue procedure also provides the procedures by which a taxpayer may obtain automatic consent to change to a rolling-average method. A taxpayer that complies with all the applicable provisions of this revenue procedure has obtained the consent of the Commissioner to change its method of accounting under § 446(e) of the Internal Revenue Code and the regulations thereunder.

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▸Contents — Internal Revenue Bulletin 2008-30

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