Is this a reimbursement of expenses or is this income from your job? If it is a reimbursement, follow the advice from @Leonard Smith. If this is income, see below.
Your per diems should have either been on Form W-2 or 1099-NEC if the persons you are working for do not consider you an employee.
Enter your self-employment income on Schedule C.
Follow these steps to go to the Schedule C section of your return:
On the top right corner of TurboTax online screen, click on Search (or for CD/downloaded TurboTax locate the search box in the upper right corner).
- Type in “schedule c” (or for CD/downloaded TurboTax, click Find).
- Click on “Jump to schedule c”.
- Click on the blue “Jump to schedule c” link
