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@Brainstrom wrote:

There seems to be a new question for the Schedule C section this year due to the covid. Part 3 line 18 want you to input a number??? How did the covid effect your business from March 2020 through December 2020 for self employment, what is the calculation for this input?

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The draft instructions to Schedule SE indicate that you can use "any reasonable method" including prorating the income by the number of days before/after 3/27/20.

https://www.irs.gov/pub/irs-dft/i1040sse--dft.pdf

So 76.503% unless you really want to do a lot more work to figure the interest-free loan.  I plan to generally discourage this but there may be a few clients who will want to do it anyway.