This question is associated with the option to defer paying some of your self-employment tax due to Covid.
If you do not want to defer any of the self-employment tax, then enter '0' for line 18.
If you do wish to defer paying the self-employment tax, then line 18 is asking for the portion of your Schedule C and/or Schedule F profit that is attributed to March 27, 2020 through December 31, 2020.
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