If you think your employer has reported your taxes incorrectly, fill out IRS Form 3949-A as soon as possible and send it in. They will do an investigation. You are *NOT* "self-employed as far as the IRS is concerned". Do your taxes as if they gave you a W-2, and select the option that says you are estimating your income. If you have other employment options available, get another job, and sue your current, soon to be former, employer for the back taxes that you owe.
