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Income Withholding for Support (IWO) Form, Instructions
Oct 5, 2023 The IWO is the OMB-approved form (PDF) used for income withholding in tribal, intrastate, and interstate cases as well as all child support orders.
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2017 General Instructions for Forms W-2 and W-3
May 2, 2017 Additional Medicare Tax. In addition to withholding Medicare tax at 1.45%, an employer is required to withhold a 0.9% Additional Medicare Tax
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45 CFR 303.100 - Procedures for income withholding.
The income of a noncustodial parent shall be subject to withholding, regardless of whether support payments by such parent are in arrears, on the effective
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