ASC 740-10-45-20

The effect of a change in the beginning-of-the-year balance of a valuation allowance that results from a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years ordinarily shall be included in income from continuing operations. The only exceptions are changes to valuation allowances of certain tax benefits that are adjusted within the measurement period as required by paragraph 805-740-45-2 related to business combinations and the initial recognition (that is, by elimination of the valuation allowances) of tax benefits related to the items specified in paragraph 740-20-45-11(c) through (f). The effect of other changes in the balance of a valuation allowance are allocated among continuing operations and items other than continuing operations as required by paragraphs 740-20-45-2 and 740-20-45-8.

ASC 805-740-45-2

The effect of a change in a valuation allowance for an acquired entity’s deferred tax asset shall be recognized as follows:

1. Changes within the measurement period that result from new information about facts and circumstances that existed at the acquisition date shall be recognized through a corresponding adjustment to goodwill. However, once goodwill is reduced to zero, an acquirer shall recognize any additional decrease in the valuation allowance as a bargain purchase in accordance with paragraphs 805-30-25-2 through 25-4. See paragraphs 805-10-25-13 through 25-19 and 805-10-30-2 through 30-3 for a discussion of the measurement period in the context of a business combination.
2. All other changes shall be reported as a reduction or increase to income tax expense (or a direct adjustment to contributed capital as required by paragraphs 740-10-45-20 through 45-21).