Yes, you are correct. TurboTax performs calculations in real time based upon amounts that you enter during the interview(s) it prompts for you. The extra "double check" questions at the end of the interview are just there to help you, in the event that something was passed over. Here is a link to the Self Employment estimator tool, which you can run on your own externally. TurboTax runs this behind the scenes for you. And here is an article that has more detailed information about the self employment tax.
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