Louisiana Revised Statutes Tit. 47, § 54. Deductions from gross income; interest

A. In computing net income, there shall be allowed as deductions all interest paid or accrued within the taxable year on indebtedness except:

B. As used in this section the word “interest” shall mean and include any deferred payment costs or charges, whether designated as interest, service or carrying charges or other charges by whatsoever term designated paid on credit, installment or other types of delayed or deferred payment purchases and other indebtedness.