Why will the Schedule C not link within my final 1040 after I have completed all sections of the Income from Form 1099-NEC?

If your return does not include a Schedule C, then TurboTax is trying to get you to fix, this issue.

Any income reported on Form 1099-NEC is not reportable directly on your tax return. Since this type of income is considered self-employment (non-employee compensation) it must be linked to a Schedule C, even if there are no expenses being claimed. 

To add a Schedule C so your 1099-NEC can be linked:

1. Open or continue your return in TurboTax
2. In the Search box type 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?
4. Follow the onscreen instructions.

The information required for the Schedule C will include the type of business, the business name (or your name if there is no specific business name), the business address (or your address), etc.