The $600 reported in box 3 of the 1099-MISC *COULD* be self-employment income. So while you are not required to file a tax return, you "might" want to. Otherwise, if the IRS comes back asking you about that $600 and how you obtained it, then you would "HAVE" to file a tax return or some other response to the IRS.
I would suggest to avoid that possibility that you see if you can use the free file option at https://turbotax.intuit.com/taxfreedom/ so you don't have to pay anything for the program.
