Regulation S-X Rule 5-03.10 lists income or loss before income tax expense as its own caption, directly after non-operating items and before the tax line. The usual XBRL element is IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest, which the SEC defines as including income from equity-method investments. Companies that present equity-method income after the tax line, as S-X caption 12 contemplates, report their pretax subtotal as IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments instead. The two can differ by the full amount of affiliate income, so check which one a company uses.
Pretax income sits between operating income and net income, and its gap from operating income shows the combined effect of interest, investment results, currency effects, and other non-operating items. Companies also split pretax income between domestic and foreign sources in the tax footnote, which helps explain the effective tax rate.
Pretax income is the base of two widely used measures. Pretax margin, which GeminIQ calculates as trailing twelve-month pretax income divided by trailing twelve-month revenue, compares profitability across companies without the effect of different tax positions. The effective tax rate divides income tax expense by pretax income. Because tax rates can vary with credits, jurisdictions, and one-time items, comparing companies on a pretax basis often gives a clearer picture of operating and financing performance than comparing net income.