The accounting entries are as follows:
On getting the loan: cash balance up, creditor (Barclays) created. No P&L effect.
Interest: P&L cost as each interest installment falls due, cash down.
Repayment of loan: cash balance down, creditor balance reduced. No P&L effect.
If the loan is paid off as per the agreed schedule, the only P&L effect is the interest.
If payments are missed, the interest rate charged will go up (as you have proved yourself to be a dodgy risk) and there will almost certainly be large fees associated with the debt restructuring. Such fees should also be a P&L charge, but are sometimes added to the loan (which, of course, further increases the interest).
