Seeding your business with personal money is NOT income so it is NOT reported on and INCOME tax return.
As the loan is paid back the interest paid will be reported on the return Sch B NOT on the Sch C if this is a single member LLC. In fact I don't know why the "business" is making the loan at all unless your business is in the business of money loaning.
What you need to do is keep good bookkeeping records for your business ... if you don't know how then either hire help or educate yourself.
