Be sure to check the 'multiple jobs' box on the w form. And read the instructions on filling it out.Complete the box below, indicating start time, total hours per day and total hours per week for your City job and your outside employment. 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. You would check the box if you have two jobs. The IRS instructions for the W4 includes the line: Multiple jobs. Complete Steps 3 through 4(b) on only one Form W-4. Secondary employment is non-CPS employment for remuneration. This form may be completed electronically, but must be printed out and signed prior to submission. The IRS instructions for the W4 includes the line: Multiple jobs.