The deferred comp Roth option essentially locks in today's tax rates on all contributions. State withholding: State taxes will be automatically withheld if you are a resident in a state that mandates state income tax withholding.We'll explain the major state personal income tax considerations that apply to deferred compensation or retirement income. Is deferred compensation (401(k), 457(b) plans) taxable? A nonqualified deferred compensation plan can reduce your taxable income, but there are risks to consider. Sign up and manage your deferred compensation retirement account.