Malina:
That's a
tough road to take. You would have to report your former employer to the IRS and argue convincingly that you met the criteria for being an employee. Search the IRS website (
www.irs.gov) and download the checklist that the IRS uses to determine whether you qualified as an employee vice a subcontractor.
Regardless, you will have to file a Schedule C/C-EZ and Schedule SE to account for the income on Form 1099-MISC. File the return and pay the tax (or start a payment plan) prior to April 15th. If you succeed in your argument with the IRS, you can then amend the return and get your SE tax money back.