There are quite a few ways to cover the cost of DHS drug addiction treatment. One payment method you may come across is a sliding fee scale (fee is based on income and other aspects). This implies that the rehab adjusts their costs based on the client?s revenue, yearly taxes and other financial variables; in the end, the price that a single person pays might not be the same as another. There are many reasons why a drug rehab would select to offer a sliding fee scale to their clients. They may select to help out an addict who would otherwise not be able to receive treatment. Another reason for supplying this payment option is that it provides the treatment facility with a tax deduction on the merit of donating their services as charity.