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. The correct amount of withholding depends on income earned from all of these jobs.
Do only one of the following.
(a) Reserved for future use.
(b) Use the Multiple Jobs Worksheet on page 3 and enter the result in Step 4(c) below; or
(c) If there are only two jobs total, you may check this box. Do the same on Form W-4 for the other job. This option is generally more accurate than (b) if pay at the lower paying job is more than half of the pay at the higher paying job. Otherwise, (b) is more accurate
TIP: If you have self-employment income, see page 2.