intraperiod tax allocation

This subtopic governs how income tax expense (or benefit) is computed and presented in interim financial statements. The core rule is a hybrid model: tax on "ordinary income (or loss)" is measured by applying a best-estimate annual effective tax rate to year-to-date ordinary income, while items excluded from that rate — significant unusual or infrequently occurring items, discontinued operations, changes in tax law or rates on deferred taxes, changes in beginning-of-year valuation allowances, and certain share-based payment tax effects — are computed individually and recognized discretely in the interim period in which they occur (740-270-25-2; 740-270-30-11 through 30-13). Recognition of interim tax benefits from losses is limited to amounts expected to be realized during the year or recognizable as a deferred tax asset at year-end (740-270-25-9).

ASC 740-20 governs intraperiod tax allocation: after total income tax expense or benefit for the period is computed under ASC 740-10, this Subtopic allocates that total among continuing operations, discontinued operations, other comprehensive income, and items charged or credited directly to shareholders' equity (740-20-45-2). Continuing operations is computed first ("with-and-without"), considering only items in continuing operations (740-20-45-7), and the residual is assigned to the single other item, or apportioned among multiple other items in proportion to their individual effects (740-20-45-12 and 45-14).