Get your taxes done using TurboTax

The W-4 only affects your withholdings from your employers, it does not account for your self-employment income.  You have two options: 1) make estimated quarterly tax payments based on your additional self-employment income, or 2) adjust your withholdings from your W-2 income.  You may have either or both employers withhold extra tax per pay period.  You make this selection in step 4 Form W-4. Line (c)