Yes, from Mike9241's post item b is the special computation explained in the post from DavidD66. If you enter the elective deferral in the Self-employment Retirement Plans section and then check the Maximize Contribution to Individual 401(k) box, TurboTax will do the special calculation for you based on your elective deferral entry as well as the business activities you entered on Schedule C.
@messner8000
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