Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Give Form W-4 to your employer.Information about Form W4, Employee's Withholding Certificate, including recent updates, related forms and instructions on how to file. Employees working and residing in Washington have no state income tax liability. You may need to fill out a W-4 state form on top of a W-4 federal form. Call us at 855-829-9855 (855-TAX-WAGE), option 2. Employee Withholding Allowance Certificate. New employees must complete federal and state tax forms. These forms ensure accurate withholding of income taxes.