Default interest refers to the extra charges added to your finance agreement if you fail to make payments on time. Essentially, it’s an additional fee that lenders apply to your account when you breach the terms of your agreement.
This can significantly increase the total cost of your loan, making it even more important to stay on top of your payments.
How default interest works
If you miss a payment or fail to keep up with the agreed schedule, your lender will likely charge default interest. This is calculated as a percentage of your outstanding balance.
The interest rate will typically be higher than the normal interest rate on your car finance. In some cases, default interest can be a daily rate, meaning the longer you delay, the more you’ll owe.

The terms of your agreement will specify how much the default interest will be, as well as the circumstances that can lead to it being charged. Many lenders will provide a grace period before default interest kicks in, but it’s crucial not to rely on this, as missing payments can still result in penalties and affect your credit rating.
At this point, it’s important to note that the charge isn’t a one-off penalty but can accumulate over time. If you continuously miss payments, the default interest will keep adding up, causing the amount you owe to grow rapidly. It’s a vicious cycle that can be difficult to break.
💡 For example, let’s say your finance agreement specifies a 3% default interest charge per month. If your remaining balance is £10,000, this would add an additional £300 every month until you catch up on payments.
Over time, the total amount of interest you owe can far exceed the initial cost of the car, turning a manageable loan into a financial burden.
Avoiding default interest
The best way to avoid default interest is simple: make your payments on time. Setting up automatic payments or reminders can help you stay on track. If you realise you’re going to miss a payment, contact your lender as soon as possible.
They may be able to offer a temporary arrangement or deferment, preventing the charges from accumulating.
If you find yourself facing default interest, try to pay off the outstanding balance as soon as possible to minimise the impact. Also, keep in mind that your credit score may be affected, which can make it more difficult to secure financing in the future.
Managing your car finance wisely
Being aware of what default interest means in car finance is vital to managing your loan effectively. While it’s easy to overlook the fine print, understanding the consequences of missing payments can help you make informed decisions.
Always aim to stick to your payment schedule, and if you ever find yourself in financial trouble, speak to your lender about possible options before things get out of hand.

Avoiding the trap of default interest
Ultimately, the key to avoiding default interest is maintaining clear communication with your lender and staying disciplined with your finances.
Keep an eye on your payment due dates and seek assistance if you’re ever in doubt. By doing so, you can avoid additional fees and keep your car loan manageable.