Did you enter it into your tax return or did you already file without that one? You have to enter all your income on the same return. If they didn't take out any withholding in box 2 you might owe it when you file your tax return. That's why you fill out the tax return each year. To reconcile the withholding to the actual tax on your total income. The withholding is just an estimate to cover what you will owe.
