To enter self-employment income not reported to you on a 1099-MISC, type “Schedule C” in
the Search box and then select the “Jump
to” link.
This will take you to where you can enter any cash, personal checks
or credit card payments (Form 1099-K) related to your self-employment. You may
be asked some general questions about your business.
After you answer them,
you’ll be taken to the Your Business
screen where you can enter this income as Additional
Income under Business Income.