If you are filing a 2022 return, there is no longer a form 1040-A or 1040-EZ. You must use form 1040.If you are filing a recent form return 2022 or prior, then you must use form 1040 if filing a schedule C. Thereu2019s no place to enter business income on a form 1040-A. Also, right at the top schedule C (2022 version), it says u201cAttach to Form 1040, 1040NR, or 1041u201d. No 1040-A or 1040-EZ. It says the same on prior versions as well.