There are quite a few ways to cover the expense of Listie drug addiction treatment. One payment method you may come across is a sliding fee scale (fee is based on income and other variables). This signifies that the rehab adjusts their costs based on the client?s revenue, yearly taxes and other financial variables; in the end, the expense that one particular client pays may not be the same as another. There are many reasons why a drug rehab would choose to offer a sliding fee scale to their clients. They may select to help out an addict who would often not be able to acquire treatment. Another reason for offering this payment choice is that it provides the treatment facility with a tax deduction on the benefit of donating their services as charity.