Information about Form W4, Employee's Withholding Certificate, including recent updates, related forms and instructions on how to file. The form tells your employer how much federal income tax to withhold from your paycheck.You'll need to complete a new W-4 every time you start a new job. To provide: An employer-completed verification of employment, wages, mandatory withholdings and deductions. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Opt Out Form, Request to Remove Personal Information from the Harris County Tax Office Website. AC-501. Pdf, Application for Property Tax Refund. AC-502. Withholding agents should withhold county tax based on the employee's Indiana county of residence as of Jan. Fill out all forms properly and completely. All submissions must be sealed and marked with the RFP number and description.