My son received a 1099 NEC form for income. Does this also need to be reported as self employment income?

Depends. Was it a one off job or more continuous?

Depends. Was it a one off job or more continuous? How much was it for? Any other income?

The IRS presumes that income reported on an IRS form 1099-NEC is self-employment income reported on IRS Schedule C Profit and Loss From Business.

In TurboTax Premier Online, report self-employment income and expenses by following these directions:

• Down the left side of the screen, click Federal.
• Down the left side of the screen, click Wages & Income.
• Click on the drop down arrow to the right of Self-employment.
• Click to the right of Self-employment income and expenses.
• At the screen Tell us the type of self-employment work you do, enter the answer and click Continue.
• Establish the self-employment activity and report the income and expense.

See this TurboTax Help.