Be sure to check the 'multiple jobs' box on the w form. And read the instructions on filling it out.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. There are a few things to keep in mind when filing your personal taxes with multiple W2 tax forms. Watch this video to learn what you need to do. 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. Employer: Complete Line 9 and mail entire form only if the employee claims over 14 allowances or exempt from withholding. Yes, you need to complete a new W4 form every time you have a significant change like changing jobs, or starting a side gig. In this guide, we will show you how to file your tax return when you are earning income from two jobs and have two w2 forms from different employers. Yes, you need to complete a new W4 form every time you have a significant change like changing jobs, or starting a side gig.