Income taxes are accounted for under ASC 740. Each period, a company estimates the income tax it owes on that period's taxable income and records the unpaid portion as a liability. In XBRL filings, currently due income taxes are tagged AccruedIncomeTaxesCurrent. A broader line that also covers sales, payroll, property, and other taxes is tagged TaxesPayableCurrent. Income tax amounts not due for more than a year, such as a liability for an uncertain tax position or a tax payable in installments, are tagged AccruedIncomeTaxesNoncurrent.
Regulation S-X Rule 5-02.20 lists taxes among the items that must be broken out of other current liabilities when they exceed 5 percent of total current liabilities, and it asks the company to identify the current portion of deferred income taxes. Smaller tax balances are often folded into accrued liabilities rather than shown on their own line.
The balance is shaped by the timing of estimated tax payments, which is why it can swing between quarters without any change in profitability. Some taxes, such as sales tax and payroll tax withholdings, are collected on behalf of governments, so they pass through the company rather than being expenses of it. Analysts compare income tax expense on the income statement with cash taxes paid and with the change in accrued taxes. A persistent gap between tax expense and taxes paid points to deferred taxes, credits, or unresolved positions worth reading about in the tax footnote.