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162(a)) and Treasury Regulation 1.461-1(a)(2) ( 26 CFR 1.461-1(a)(2)), the "all events" test entitled an accrual-basis taxpayer to a federal income tax business-expense deduction, for the taxable year in which (1) all events had occurred which determined the fact of the taxpayer's liability, and (2) the amount of that liability could be determined with reasonable accuracy.