In addition to what Bob Maloney said, you may want to check the IRS source for the same. Here is an important part:
"You must pay self-employment tax and file Schedule SE (Form 1040) if either of the following applies.
Your net earnings from self-employment (excluding church employee income) were $400 or more.
You had church employee income of $108.28 or more.
Generally, your net earnings from self-employment are subject to self-employment tax. If you are self-employed as a sole proprietor or independent contractor, you generally use Schedule C or C-EZ to figure net earnings from self-employment"
To the extent any individual puts forth their personal services to the general public, the income that is derived is deemed to be self-employed income unless it is provided through a Corporation for multi-owner LLC. Having said this, if in fact you are self-employed and you have collected fees or income from your personal services, you will be required to file a schedule C with your personal tax return. If the bottom line of the schedule C is a positive number or what we call self-employed net income, then you are required to file schedule SE, to calculate your self-employed tax which consists of Social Security Tax and the Medicare tax. I hope this helps and good luck
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