You can estimate how much income you will have in 2021.
If you’re single and have multiple jobs or you’re married, filing jointly and both work, remember these things:
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You typically have to have a W-4 on file for each job.
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For the highest paying job’s W-4, fill out steps 2 to 4(b) of the W-4. Leave those steps blank on the W-4s for the other jobs.
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If you’re married and filing jointly, and you both earn about the same amount, you can check a checkbox indicating as much. The trick: Both spouses need to do that on each of their W-4s.