A loan is NOT income nor is the payback an expense or a loss ... so it is not listed anywhere on a Sch C form. If you have a corporation the the loan will be reported on the balance sheet only on the corp return ... it is still not income or an expense. If you pay interest on the loan then that is an expense.
Now, what the loan paid for is an expense ... so if it paid rent, utilities, bought inventory then those items are deductible expense on the return. So you got $50K and bought $50K of say inventory then only the inventory cost is entered on the return and not the loan.
