They have not been taking out any federal income tax withholding? Then you might end up owing on your tax return. If you have a low income you might not owe anything. But to get a refund you have to pay in more withholding than the tax due on your income. Although there are a couple credits you can get refunded even if you have not paid in.
And you don't take the Standard Deduction on your paychecks. That is only on your tax return. The Standard Deduction is subtracted off all your income to give you the Taxable Income.
