Yes! You need to make sure your withholding is in line with the TOTAL income you make.
You mentioned you had "zero withholding" on your paycheck. Did you mean when you filled out your W-4 (Employee's Withholding Certificate) you entered a "0"?
If so, that is the problem! The current W-4 (it's the one that works with the tax law we're in currently) does not have an option for a "0".
If you only have one source of income (one job, one employer) you will merely fill out the W-4, sign at the bottom and you're done!
If you have more than one source of income (two jobs, two employers) we have to follow the instructions and do a little bit of math to get the withholding correct.
Each employer won't know about the other income you make unless you tell them on the W-4 form. So, each employer would withhold based only on the income you made with them. Once your wages from both employers are added together, you may be in a different tax bracket and owe.
To see if you're on track, grab your most current pay-stub(s) go to the IRS Tax Withholding Estimator
You can always do this throughout the year to see if you're on track!
Especially helpful when you win the lottery!
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