Deductions & credits

You can enter the investment income on your Schedule C as Uncommon Income. 

1. When you are on the screen for your business, click the box Add Income for this work.
2. On the next screen, Let's enter the income for your XX work mark the radio button next to Uncommon Income.
3. Enter the income and description on the next screen.  If you need more lines, click Add Another Row.  [See screenshot below.]

@stech