See, e. g., United States v. Consolidated Edison Co., 366 U.S. 380, 385 n. 5, 81 S.Ct. 1326, 1329, 1330, 6 L.Ed.2d 356, 360 (1961); Clevite Corp. v. United States, 386 F.2d 841, 843, 181 Ct.Cl. 652, 658 (1967); Turtle Wax, Inc. v. Commissioner of Internal Revenue, 43 T.C. 460, 466-67 (1965); Denver Rio Grande Western Railroad Co. v. Commissioner of Internal Revenue, 38 T.C. 557, 572 (1962). Most recently, we applied the "all events" test in Union Pacific Railroad Co. v. United States, 208 Ct.Cl. ___, 524 F.2d 1343 (1975). We held that the test applied to determine deductibility of payroll taxes, similar to those in the instant case, which stemmed from accrued vacation pay.