While you can import into TurboTax your transactions from your securities account (investment account, non-MtM account), the transactions you effect in your MtM account cannot be imported into TurboTax as those transactions--as you have noted in your post--get reported on Form 4797. If you decide to use TurboTax Home & Business, you will need to use the download version as you will have to go into Forms mode (upper right of your screen), select Form 4797 from the list of forms in the left margin, and manually report on line 10 of Form 4797 all gains and losses from sales and dispositions of securities or commodities held in connection with your trading business. TurboTax does not support, in its step-by-step question and answer format, the information that you will need to enter on line 10 of Form 4797. Forms mode is not available in the online version of TurboTax.
Moreover, TurboTax does not support the Trader's statement, which shows the transaction detail that supports the gross amount on line 10, that Trader's must attach to their return. Thus, you will need to separately prepare your statement and attach it to your return. Your completed return will need to be paper mailed to the IRS.
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