if the $600 is your only income, you are not required to file a federal return. i would not file. the worse that can happen is the IRS makes an inquiry (sends you a notice) but with only $600 of income on file, this is doubtful. say it does. then there will be a number on the notice you can call. explain that your only income was $600 and they'll tell you what to do. if they say file, again doubtful, file. there will be no taxes. penalties or interest since your liability is $0, you could probably prepare the return manually
My uncle, had income but was below the filing threshold in 2014-2018. never filed. never got a notice.
if your state has an income tax, you may need to file. if you tell us what state we can give better advice on this
