There are numerous ways to cover the expense of Gray drug addiction treatment. One payment method you may come across is a sliding fee scale (fee is based on earnings and other variables). This means that the rehab adjusts their costs based on the client?s income, yearly taxes and other financial variables; in the end, the expense that one individual pays may not be the same as another. There are various reasons why a drug rehab would select to offer a sliding fee scale to their clients. They may pick to help out an addict who would in any other case not be able to obtain 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.