An operating expense, or operating expense as a class, that does not vary with business volume. Examples: interest on bonds; rent; property tax; depreciation (sometimes in part); minimal amounts of general overhead. Fixed costs are not fixed in the sense that they do not fluctuate or vary; they vary, but from causes independent of volume.
N.Y. Comp. Codes R. & Regs. Tit. 10 § 451.114