Since you were an independent contractor and you made more than $400 for the year, you are required to file a tax return. The owner is supposed to give you a Form 1099-MISC since she paid you more than $600, but you don't need the form in order to file your tax return. You can report your income based on your own records of how much you were paid. You report the income as business income. If you have no other income you will not have to pay any income tax, but you will have to pay self-employment tax. The net rate for the self-employment tax will be about 14.13%.
