Accounting for income taxes is governed by ASC 740, and the total is tagged in XBRL as IncomeTaxExpenseBenefit. It has two parts. Current tax, tagged CurrentIncomeTaxExpenseBenefit, is the tax payable or refundable on the period's taxable income. Deferred tax, tagged DeferredIncomeTaxExpenseBenefit, reflects changes in deferred tax assets and liabilities, which arise when income or expenses are recognized in different periods for accounting and for tax. Regulation S-X Rule 5-03.11 limits this caption to taxes based on income, so sales, payroll, and property taxes are reported elsewhere as operating expenses.
The line covers continuing operations only. Taxes related to discontinued operations and to items of other comprehensive income are allocated to those items and reported net. Companies must disclose a reconciliation between their reported tax and the tax at the statutory rate, which explains the effect of foreign operations, tax credits, valuation allowances against deferred tax assets, and changes in tax law.
The deferred component is why tax expense and cash taxes paid can differ widely. Accelerated tax depreciation, for example, lowers current taxes and raises deferred tax expense. Dividing income tax expense by pretax income gives the effective tax rate, which is one of the inputs GeminIQ uses to convert EBIT into after-tax operating profit. A rate far from the statutory level, or large swings from year to year, usually point to one-time items that are worth reading in the tax footnote.