Do I report my earning before or after my agency takes their cut

You report your total earnings before the agency takes out its fees.  You can then list agency fees, cost of head shots, beauty services for a gig, etc., as expenses against your income to arrive at your net income.  

The program automatically complete Schedule C for you when you add your self-employment income in TurboTax (usually from Form 1099-NEC or 1099-MISC). Here's how to add your self-employment income:

1. Open or continue your return
2. Search for schedule c and select 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 on-screen instructions