Did you not receive a W-2 because your employer failed to send you one or because you did not get a paycheck and worked for yourself? Did you get a letterr from the IRS stating your income and how much you owe? If the latter two apply and the amounts are correct, odds are the amount they say you owe is correct.
If you were employed and had taxes taken from your check, the amount the IRS says you owe is probable still correct. If you don't know how much you made, you can get a transcript from the IRS.
