If you are required to file a tax return, you must report all self employment income no matter how small the amount. If that is your only income, you must file a return if it is more than $400 to pay self employment taxes.

The $600 number is the amount you must make before the payer must issue a 1099-MISC but it has no affect on whether you must report the income not even if you didn't get a 1099-MISC.