Last reviewed: 2026
Why examples help
Most people do not think about debt as a formula. They think about normal life: the car breaks, Christmas costs more than expected, income drops, or a credit card helps cover a difficult month.
That is why examples matter. A percentage like 24.9% APR can feel abstract. But when you see a balance, a monthly payment and the interest being added, it becomes much easier to understand what is really happening.
Sarah's story: she pays every month but feels stuck
Sarah is not ignoring her debt. She makes her payment every month because she wants the balance to go down. The frustrating part is that when the next statement arrives, the balance has not fallen by as much as she expected.
At 25% APR, the first month’s interest could be around £62.50 before the balance starts to reduce. That means a large part of Sarah’s £90 payment may be used to cover interest first.
James's story: the car repair that could not wait
James needs his car to get to work. When it fails its MOT, he does not have enough savings to pay for the repair. He puts the cost on a credit card because he needs the car back quickly.
This is not careless spending. It is the kind of real-life cost that can happen to anyone. The issue is what happens afterwards if the balance is repaid slowly.
Emma's story: Christmas spending that lasted into spring
Emma wants Christmas to feel special. She buys presents, food and pays for travel. The spending happens gradually, so it does not feel like one large bill until the statement arrives.
The problem is not that Emma wanted a nice Christmas. The problem is that the cost can continue long after Christmas if the balance is not cleared quickly.
The main lesson
The problem is not only the amount borrowed. It is the combination of balance, APR, monthly payment and time. A debt that looks manageable today can become expensive if the repayment is too small compared with the interest being added.