How a business overdraft works in the UK
A practical guide to business overdraft limits, interest, fees, reviews and when short-term working-capital use can become a warning sign.
A business overdraft lets the account balance go below zero up to an agreed limit. It is normally a flexible form of short-term borrowing rather than permanent finance. The bank may charge interest and other fees under the business tariff, may review the facility, and can change or withdraw it subject to the agreement. Compare the total cost with other borrowing and do not build a recurring cash-flow gap around an overdraft that is not guaranteed forever.
An overdraft is attached to the current account
Unlike a term loan, a business overdraft is usually drawn automatically when outgoing payments take the account below zero, up to the agreed limit. That flexibility can be useful when customer receipts and supplier bills do not land on the same day. Interest is generally charged only on the amount used, although business tariffs can also include arrangement or renewal fees.
The exact pricing is provider-specific, so compare the current tariff rather than applying consumer-overdraft rules to a business facility. Our business bank account fees guide shows how to model account costs around real transaction patterns.
The facility is designed for short-term liquidity, not a structural loss
A healthy use case is a temporary timing gap: for example, payroll is due on Friday and a large customer invoice clears the following week. A warning sign is an account that never returns to credit and uses the full overdraft every month. In that situation the business may be financing long-term working capital or losses with a facility the bank can review.
Track the highest balance used, days overdrawn and the reason for each prolonged period. That gives management a better picture than simply knowing that the limit has not yet been breached.
Banks can review the limit and the information behind it
A business overdraft is credit. The bank may assess turnover, account conduct, financial statements, credit information, ownership and the purpose of the facility. It can also ask for updated information at review. If trading has weakened or the account repeatedly exceeds its limit, renewal can become harder.
Prepare early for review rather than assuming last year’s limit will continue automatically. Have recent management accounts, cash-flow information and an explanation of any unusual transactions ready.
Going beyond the agreed limit can disrupt payments
If the account does not have enough available funds, supplier transfers, Direct Debits or card transactions may be declined or returned depending on the bank and payment type. That can create secondary costs such as late supplier charges or damaged relationships. Build a cash buffer rather than treating the exact overdraft limit as the business’s target balance.
Set internal alerts before the available balance reaches the facility ceiling. A finance team should have time to move cash, delay optional spending or speak to the bank before a critical payment fails.
Switching accounts while overdrawn needs extra planning
A small business can potentially use the Current Account Switch Service while overdrawn, but the new provider does not have to offer the same overdraft. The business needs to agree the required facility with the new bank or make separate arrangements to repay the old overdraft. Do not start a switch until that funding question is clear.
Our guide to switching a business current account covers the operational checks around payments, statements and the switch date.
Compare the overdraft with alternatives before it becomes permanent
If borrowing is needed for months rather than days, compare the overdraft’s real annual cost with a loan, asset finance, invoice finance or other appropriate business funding. The cheapest structure depends on amount, duration, security and the company’s credit profile.
The decision should be based on cash flow, not on convenience alone. Overdrafts are easy to use because they sit inside the current account, which can make expensive borrowing feel like an ordinary negative balance.
Frequently asked questions
Is a business overdraft guaranteed once approved?
No. The facility is governed by the bank’s agreement and can be reviewed or changed. Check the current terms and review date.
Can a business switch bank while overdrawn?
Potentially yes, including through CASS if eligible, but the new provider must separately agree any replacement borrowing.
Is an overdraft better than a business loan?
It depends on duration and cost. Overdrafts can suit short gaps; longer borrowing may be more predictable through another facility.
Sources and verification
- Business.gov.uk — Getting a business bank account
- Current Account Switch Service — Business questions
Oliver Grant — Markets & Regulation Writer
I see a business overdraft as a liquidity tool, not as extra turnover. Used briefly, it can smooth the mismatch between receipts and payments without forcing the company to arrange a new loan every time cash arrives a few days late. The danger begins when the business treats the limit as permanent capital and stops asking why the account never returns to credit. I would monitor utilisation and days overdrawn every month, not just whether the bank has declined a payment. Before a review I would prepare a short cash-flow explanation and current financial information so the bank can see why the facility is needed and how it will be repaid. I would also keep a buffer below the formal limit because a payment failure at payroll or supplier deadline can cost more than the interest itself. When comparing accounts, price the overdraft alongside monthly fees and transaction costs. If a business is switching bank, I would settle the replacement funding before moving payments. A new current account does not automatically bring a new overdraft. The right question is not “how much can we borrow?” but “what short-term timing problem is this facility solving, and what happens if the bank reduces it?”
MyBankAnswers uses official provider and UK regulatory sources wherever practical. Information is general and does not constitute financial advice.