Be sure to check the 'multiple jobs' box on the w form. And read the instructions on filling it out.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. Use this step if you (1) have more than one job at the same time, or (2) are married filing jointly and you and your spouse both work. A W4 form, or "Employee's Withholding Certificate," is an IRS tax document that employees fill out and submit to their employers. Complete this form so that your employer can withhold the correct California state income tax from your pay. Personal Information. Make sure that you check the box on the W-4 for both jobs. (Note: This option will split the standard deduction in half for each job.