Overdrafts have a bit of a mixed reputation. Used sensibly, they can act as a short-term safety net between paydays. Used carelessly, they can quietly become one of the most expensive forms of borrowing you have.
Here’s what’s actually happening when you dip into an overdraft, what it costs, and how to tell the difference between a helpful buffer and a costly habit.
It’s also worth reading alongside our guides on simple budgeting methods that work and building an emergency fund from scratch.
Quick Answer
In short: An overdraft lets you spend more than the balance in your current account, up to an agreed limit, with interest charged on whatever you borrow. Arranged overdrafts are cheaper than unarranged ones, but both cost more than most people expect, so they’re best used briefly rather than as a long-term solution.
Key Takeaways
- An arranged overdraft is agreed in advance with your bank, with a set limit and interest rate.
- An unarranged overdraft happens when you go beyond your agreed limit, or have no agreement at all, and usually costs significantly more.
- Overdraft interest is typically charged as an annual rate, similar to a credit card, but applied daily.
- Overdrafts are best used as a short-term buffer, not ongoing borrowing.
- Regularly relying on an overdraft is often a sign it’s worth reviewing your budget.
What Is an Overdraft?
An overdraft is an agreement with your bank that allows your current account balance to go below zero, up to an agreed limit. Rather than a payment being declined when you run short, the bank effectively lends you the difference, charging interest on the amount borrowed.
Arranged vs Unarranged Overdrafts
An arranged overdraft is agreed with your bank in advance, with a set limit, for example £500, and a clearly stated interest rate.
An unarranged overdraft occurs when you spend beyond your arranged limit, or have no overdraft agreement at all and your account goes negative. This is typically far more expensive and can also affect how your bank views your account going forward.
How Overdraft Interest Is Calculated
Most UK banks now charge overdraft interest as a single annual rate, known as an EAR (Equivalent Annual Rate), applied daily to whatever you owe. Following regulatory changes by the Financial Conduct Authority, banks were required to simplify overdraft pricing so customers could compare costs more easily, replacing older systems of daily and monthly fees.
For example, if your overdraft rate is around 39.9% EAR and you borrow £200 for ten days, you’ll be charged interest for those ten days at that rate, which can add up quickly if the overdraft isn’t cleared promptly.
When an Overdraft Makes Sense
- A short gap before payday, where you know money is coming in within a few days.
- A one-off unexpected expense, such as an emergency repair, that you can clear quickly.
- As a safety net, rather than a regular source of extra spending money.
When to Avoid Using One
- As a regular top-up to your monthly budget. If you’re consistently relying on your overdraft, it’s usually a sign your budget needs adjusting rather than your overdraft limit needing increasing.
- For non-essential spending. Interest charges can quickly outweigh the value of discretionary purchases.
- When cheaper borrowing options exist. A 0% purchase credit card, for a short period, may cost less than persistent overdraft use.
Comparison Table: Overdraft vs Other Short-Term Borrowing
| Option | Typical Cost | Best For |
|---|---|---|
| Arranged overdraft | Moderate to high EAR | Short, occasional gaps before payday |
| Unarranged overdraft | Very high, sometimes highest of all options | Should be avoided where possible |
| 0% purchase credit card | No interest during promotional period | Larger one-off costs, if repaid before the offer ends |
| Personal loan | Fixed rate, often lower than overdraft | Larger, planned expenses |
Common Mistakes
- Treating an overdraft as extra income. It’s borrowing, not a top-up to your salary.
- Not checking the EAR before using it. Rates vary significantly between banks.
- Letting an overdraft become permanent. Persistent use without a plan to clear it can become expensive over time.
- Ignoring unarranged overdraft risk. Going beyond an agreed limit, or having no agreement, is usually the costliest way to borrow via a current account.
- Not exploring cheaper alternatives. A short-term personal loan or 0% credit card may cost less for larger amounts.
Real UK Scenarios
Scenario 1: Josh, using his overdraft for three days before payday.
Josh occasionally dips £100 into his arranged overdraft for a few days before his salary arrives, clearing it immediately on payday. Used this way, the cost is minimal.
Scenario 2: Priya, relying on her overdraft every month.
Priya noticed she was permanently sitting in her overdraft, paying interest continuously. After reviewing her budget with a free MoneyHelper tool, she adjusted her spending and gradually cleared the balance.
Scenario 3: Sam, hitting an unarranged overdraft.
Sam’s direct debit took his account beyond his agreed limit, triggering unarranged overdraft charges. He contacted his bank, who agreed to increase his arranged limit slightly to avoid this happening again.
Expert Tips
- Contact your bank before you go over your limit; many will discuss a temporary increase to avoid unarranged charges.
- Use banking app alerts to notify you when your balance is getting low.
- If you’re regularly in your overdraft, treat it as a signal to review your monthly budget rather than simply asking for a higher limit.
- Compare overdraft rates when choosing a bank account, not just switching bonuses or app features.
Frequently Asked Questions
Is an overdraft a good way to borrow money?
It can work well for short, occasional gaps before payday, but it’s generally an expensive way to borrow for larger or ongoing amounts.
What’s the difference between arranged and unarranged overdrafts?
An arranged overdraft is agreed in advance with a set limit and rate, while an unarranged overdraft happens when you exceed that limit or have no agreement, usually at a higher cost.
How is overdraft interest calculated?
Most UK banks charge a single annual rate (EAR) applied daily to the amount you owe, following Financial Conduct Authority rules simplifying overdraft pricing.
Does using an overdraft affect my credit score?
Regularly maxing out or exceeding your overdraft limit can affect how lenders view your financial management, even though the overdraft itself isn’t a separate credit product.
Can I be refused an overdraft?
Yes, banks assess your income, spending and credit history before agreeing an arranged overdraft limit.
Is it better to use a credit card instead of an overdraft?
For larger amounts, a 0% purchase credit card can sometimes be cheaper, provided you repay it within the promotional period.
What happens if I go over my overdraft limit?
You may be charged unarranged overdraft fees or interest, and in some cases, a payment could be declined if it would take you beyond an unarranged limit the bank will allow.
Can I have an overdraft removed from my account?
Yes, you can ask your bank to reduce or remove your overdraft facility at any time.
Do all bank accounts come with an overdraft?
No, basic bank accounts typically don’t offer overdraft facilities, while standard current accounts often do, subject to approval.
How can I clear my overdraft faster?
Prioritising regular repayments, even small ones, and reducing non-essential spending temporarily, can help clear an overdraft more quickly than letting it sit.
Conclusion
Overdrafts aren’t inherently bad, but they work best as an occasional short-term buffer rather than a regular part of your monthly budget. Understanding the real cost, and having a plan to clear any balance quickly, keeps them a useful tool rather than an expensive habit.
Overdrafts let you borrow through your current account up to an agreed limit, with interest charged daily. Arranged overdrafts cost less than unarranged ones, but both are best used briefly rather than relied on regularly.
This article is for educational purposes and should not be considered financial advice.
