This question is asking for the Self Employment Income of the Taxpayer. That would be the Net Self-Employment income amount from Schedule C.
Form 2210 is trying to calculate whether you owe a penalty for not withholding enough (or paying estimated taxes) on your income in 2018.
There are exceptions to the Penalty, and TurboTax will guide you through this section.
Here's more info:
https://ttlc.intuit.com/replies/3300251
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