Not sure why you expected that students do not pay tax. Students do not get any sort of "tax-free" status. If someone told you that, they were mistaken. If you are filing single, then your federal standard deduction is $14,600. That is the amount of your income that is "tax free"-- just like any other single filer. The rest of your income is subject to federal tax. If you did not have enough tax withheld from your paychecks then it is possible for you to owe. When you enter your W-2's with the amounts of income and the amounts withheld for federal and state tax, the software calculates whether you owe more tax or get a refund.
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