Is taking a fixed amount in exchange for withdrawing salary before its due date considered usury (ribā)?

The due salary is paid by the employer to the employee at the end of the month. Your company's action of paying a portion of the employee's salary in advance, then recovering it from him at the end of the month with an increase for this service, is in reality an interest-based loan (riba). This is because every loan that draws a benefit for the lender is usury (riba), and the stipulated increase on the loan is usury. The loan must be purely for the sake of Allah, and the benefit must be exclusively for the borrower.