I believe you are correct. Note that this is different from the minimum income you need to make to file a tax return. Now, if there's no paperwork, it doesn't matter in practice. However, I receive Amazon forms for some minimal royalty and other revenue and if I don't include those on my tax returns there's a good chance it would trigger something. I've had Interest 1099s(?) for literally pennies for small dollars in some account that paid minimal interest.