The State of Illinois Deferred Compensation Plan is a supplemental retirement program for State employees. Download any State of Illinois Deferred Compensation Plan form now using Acrobat Reader.These forms allow data to be typed into the form and saved. Income from the Deferred Compensation Plan is not subject to State of Illinois tax when taken as a qualified distribution. NYS Pension Taxation Requirements By State. Will Your NYS Pension be Taxed If You Move to Another State? The withdrawals are also subject to state income tax. A 457(b) deferred compensation plan is a supplemental retirement savings program that allows you to make contributions on a pre-tax basis. A 457(b) plan is a tax-deferred retirement savings plan. Funds are withdrawn from an employee's income without being taxed and are only taxed upon withdrawal.