If I-9 link above doesn't open for you, it's due to Adobe Reader issue. Feel free to use following link instead: https://www.uscis.gov/i-9
(These links are not related to Paystubz).
(Note: The W4 Assistant will ask you various questions to help you complete a W4 Form.That web page/form are NOT part of our regular systems (nor are the other links above). Should you use this method to help you complete a new W4 form, you must provide the completed form to your organization's payroll administrator.For further questions on how you should complete form W4, please consult your favorite income tax professional!)