Complete el Formulario W-4 para que su empleador pueda retener la cantidad correcta del impuesto federal sobre los ingresos de su paga. Information about Form W4, Employee's Withholding Certificate, including recent updates, related forms and instructions on how to file.The forms listed below are PDF files. They include graphics, fillable form fields, scripts and functionality that work best with the free Adobe Reader. Demographic and Administrative Forms for New Employees. Form Number (if applicable), Form Description. Learn how to fill out a W4 form with this updated indepth guide for 2025. A W4 form, or "Employee's Withholding Certificate," is an IRS tax document that employees fill out and submit to their employers. Use Form I9 to verify the identity and employment authorization of individuals hired for employment in the United States. Form W-4 tells your employer or employer's payroll representative how much federal income tax withholding to keep from each paycheck.