It's not a matter of justifying the cost of filing accurately, it is an IRS requirement that you not only report all of your income if you are required to file a tax return but if you have more than $400 in self-employment income, you are required to file. Also, if you do not enter the self-employment income, you are not allowed to take the potential benefit if you experienced a loss for the year in your business.
See Am I considered self-employed? and What self-employed expenses can I deduct? to get the best idea on how to present your situation accurately. Also, see Do I need to file a federal return this year? to ensure you are required to file.
@djnnoor
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