Aside from the filing requirement for self-employment income, you must file a tax return if you received advance Premium Tax Credit for health insurance from the Marketplace ("Obamacare"), or if you received Advance Child Tax Credit payments. You might also want to file, even though you are not required to, if you qualify for the Recovery Rebate Credit and you did not receive a stimulus payment (Economic Impact Payment) for the full amount of the credit that you qualify for.
