Hello,
Very good question. There are 2 options you can do. You can make estimated tax payments for the secondary work as a tutor or update your W4 form at work to account for the increased income to ensure withholdings are account for proper income tax bracket. If both jobs are W2 issued with withholdings then you will need to update both W4s for each employer. In addition, I would recommend using a tax calculator like TaxCaster to estimate taxes. I will also include a really good article about how to estimate your federal withholdings.
TaxCaster
W4 Calculator
How to Estimate Federal Withholdings
