Completing I-9 and W-4 Forms

If you need help completing your I-9 forms or W-4 forms for new employment, this free lesson can help.

Form W-4 and state withholding form

W-4 form (employee's withholding allowance certificate)

If you work in the United States, you are required by federal law to pay federal income tax. Unless you are hired as an independent contractor, your employer will use information you provide to fill out the W-4 form and withhold the correct amount of income tax from your pay. Issued by the Internal Revenue Service, Form W-4 includes three types of information your employer will use to determine your withholding:

  1. Whether to withhold at the single rate or at the lower married rate
  2. How many withholding allowances you claim (each allowance reduces the amount withheld)
  3. Whether you want an additional amount withheld

Learn more at or review this sample W-4 form.

W4 FormW4 Form

State withholding form

You will also file a state income tax withholding form. Using the information you provide, your employer uses this form to determine the correct amount of state income tax to withhold from your pay. Types of information that are used to determine your withholding may include your marital status, age, and number of dependents.

To learn more about your state withholding form, visit your state's Department of Revenue website.