Complete Form W4 so that your employer can withhold the correct federal income tax from your pay. Consider completing a new Form W-4 each year.A W4 form, or "Employee's Withholding Certificate," is an IRS tax document that employees fill out and submit to their employers. I work as a cook and my employer gave me a 1099MISC. Use to identify and withhold the correct federal income tax from your pay. What Is This Form For? Employers will figure withholding based on the information from the employee's most recently submitted Form W-4, Employee's Withholding Certificate. The W4 form is used to adjust withholding. Submit a W4 to your employer to correct the error. Today we are talking all about the new york state withholding form and how to fill that out.