Paper employer withholding and school district withholding forms are no longer available. Electronic filing has been mandatory since 2015.The following codes identify payees that are exempt from backup withholding. Enter the appropriate code in the space on line 4. Not all forms are listed. Employer Withholding Forms. The majority of the forms are PDF files. Download Form W-4 V: Voluntary Withholding Request from the IRS' website. Submit form IT 4 to your employer on or before the start date of employment so your employer will withhold and remit Ohio income tax from your compensation.