How the Total Cost of a Secured Loan Is Calculated
The total amount repayable on a secured loan is the sum of all payments you make over the full term. For a straightforward repayment loan, this means multiplying your fixed monthly payment by the number of months in your term. For example, if your monthly payment is £387.50 and your term is 120 months (ten years), your total amount repayable is £46,500.
For a £30,000 loan at 9.9% APR over ten years, that total repayable figure of approximately £46,500 means you are paying around £16,500 in interest and fees over the life of the loan — more than half the original amount borrowed again. This is not unusual for secured loans at this rate and term, and it underlines why the total cost figure deserves as much attention as the monthly payment.
Any arrangement fees added to the loan are included in the total repayable figure because you are paying interest on them throughout the term. If a £500 lender fee is added to your £30,000 loan, the total borrowed is £30,500, and the interest charges apply to that higher figure from day one. Even a modest fee can add several hundred pounds to the total cost when spread across a long term.
Why Longer Terms Increase Your Total Cost Dramatically
Extending your loan term is one of the most effective ways to reduce your monthly payment — but it is also one of the most costly decisions in absolute terms. The longer you hold debt at a given interest rate, the more interest accrues. Each extra year added to a secured loan term significantly increases the total amount you repay.
To illustrate this, consider a £30,000 loan at 9.9% APR. Over five years the monthly payment is approximately £638, giving a total repayable of around £38,280 — meaning you pay roughly £8,280 in interest. Extend the same loan to ten years and the monthly payment falls to approximately £387, which looks much more affordable. But the total repayable rises to around £46,500, meaning total interest of £16,500 — double what you would have paid over five years.
Stretch the same loan to fifteen years and the monthly payment drops further, but the total interest paid grows substantially again. For most borrowers, the right term is the shortest one they can comfortably afford, not the longest one that makes the payment look manageable. A broker can model different term options and show you the total cost implication of each before you commit.
