Definition of Fixed charges
Costs that do not vary with changes in output and would continue even if firm produced no output at all, such as most management expenses, interests on bonded debt, depreciation, property taxes, and other irreducible overhead. Seattle Rendering Works, Inc. v. Darling-Delaware Co., Inc., 104 Wash.2d 15, 701 P.2d 502, 506.
That's the definition of Fixed charges in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.