@MarilynG1 Thank you for your useful information. I added the new Securities Trading business. The Schedule C is created. I entered the 4797 from. The gains/losses are taxed. I went to see Schedule C. There are no numbers there. I thought I should input income here in the Business Income screen. But I found this gains/losses will be taxed again. I am confused now. There is no connection between the 4797 form and the related Schedule C form? TurboTax cannot populate Schedule C with the 4797 data automatically?
