Select one payment option: If you are initiating a periodic (recurring) payment, complete the attached IRS Form W-4P in its entirety. Notice: Child support enforcement services are available to assist you in collecting child support, including preparing a support petition for you.If the divorce was commenced on or after January 25, 2016 and if either party is seeking maintenance,. Form (UD-8-(1) and Form UD-8((2) are required forms. Information on pension and annuity payments that are subject to federal income tax withholding.