This form is used to request the issuance of income withholding for support. The IWO is the OMBapproved form (PDF) used for income withholding in tribal, intrastate, and interstate cases as well as all child support orders.Wage withholding lets you make your child support payments through your regular paycheck. This video provides some general information about how to fill out your income withholding for support order form. Court case number; Respondent's social security number; Name of the county where your support order originated i.e. Check the box to stop income withholding on a child support order. The purpose of the form is to help get the child support collected if he is employed and then paid to you. img. logo. Family Lawyer: DivorceLawyer. Using this information, USCIS can determine the state of residence at the time a person applied for naturalization. Take home pay is calculated based on up to six different hourly pay rates that you enter along with the pertinent federal, state, and local W4 information.