The IRS instructions for the W4 includes the line: Multiple jobs. Complete Steps 3 through 4(b) on only one Form W-4.Be sure to check the 'multiple jobs' box on the w form. And read the instructions on filling it out. Look for Step 2, Multiple Jobs. This video goes over how to complete Form W-4 if you have 2 jobs or if you are married and your spouse works as well. Complete this step if you (1) hold more than one job at a time, or (2) are married filing jointly and your spouse also works. Brings you to Part 2 of the Employment Application. Don't complete and submit this form until the hiring agency asks for it later in the hiring process. The employee should complete Form A-4 electing their withholding percentage and return it to the employer.