Did you prepare a tax return and file it? Here is where to check if you efiled a tax return and whether it was accepted or rejected: https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp
If your income was a 1099-MISC, you would have been required to file a tax return since the amount of income was over $400. You would have been required to pay self employment tax of about 15% on the $100 over $400. You would not owe any federal income tax other than the self employment tax.