Where do you add cash income

[Carl]

Generally, when paid in cash the IRS considers you to have been self-employed and "in business" for yourself when you were earning, and then paid that cash. It's reported on SCH C - Business Income & Expenses. That's under the Business Tab, and is where you'll report your cash income.

[PatriciaR]

If Your self-employment income was only from cash or personal checks or credit card payments, please follow these steps:

Type “Schedule C” in the Search box (upper right of program) 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.

[kzigmant]

So if someone simply has Cash Income that they want to report, they should report it on a Schedule C?

Assume I received a check in the mail for whatever reason, but the income was not earned income and simply just income that was received that I want to report.  Where or how else would I report this income?