Interest on a personal loan used to invest in a business would be reported as Investment Interest Expense, found under Deductions & Credits.
The easiest way to
find this section of TurboTax is to use the Search box at the top right side of
the TurboTax header. Click on the magnifying glass, type in "investment interest expenses",
hit Enter, and click on "jump to investment interest expenses" to go directly to beginning of
this topic.
Or go to My Account
>> Tools >> Topic Search. Type in "investment interest expenses", then click the
topic in the list to go directly to the start of this section.
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