If I get paid monthly via PayPal by 6 clients then total all of the payments at year's end for my gross income, what type of income is this considered?

It is self-employment income. You are earning this money. Since you are not an employee who receives a Form W-*2, you are by default, self-employed.

You can report this on Schedule C.

Schedule C is supported in TurboTax Self-Employed (both online and in the mobile app) and in all personal 1040 versions of the TurboTax CD/Download software.

To set up your business:

1. Open or continue your return.
2. Search for schedule c and click the Jump to link in the search results.
3. Answer Yes to Did you have any self-employment income or expenses?
   • If you've already entered self-employment work and need to enter more, select Add another line of work.
4. Follow the onscreen instructions.