How long do I need to keep these records?

 I-9 Forms – Employers must retain original I-9 forms for 3 years after the date of hire, or one year after the date employment ends, whichever is later.

W-4 Form - Keep a W-4 on file for at least four years after the date an employee’s taxes were due or paid — whichever is later. You can store these forms manually or electronically, as long as you can provide a copy of the form to the IRS if requested. When the time is up, you should destroy paper forms and delete electronic ones.