Disponible en español. Complete Form IT-2104 so that your employer can withhold the correct state and local income taxes from your pay.Before making any entries, see the Note below, and if applicable, complete the worksheet in the instructions. A W4 form, or "Employee's Withholding Certificate," is an IRS tax document that employees fill out and submit to their employers. Information about Form W4, Employee's Withholding Certificate, including recent updates, related forms and instructions on how to file. Form W4 tells you, as the employer, the employee's filing status, multiple jobs adjustments, amount of credits, amount of other income, amount of deductions, Below are forms commonly associated with employment taxes; however, this list is not exhaustive. Form instructions are either included with the form itself. Completing this form is voluntary, but we hope that you will choose to fill it out. Withholding Tax Forms and Instructions To ensure you are able to view and fill out forms, please save forms to your computer and use the latest.