What an overdraft facility actually costs compared to invoice finance

By InvoiceReminder Editorial Team · Published 6th August 2026

When late payments leave a hole in your cash flow, it’s tempting to reach for the nearest financial plaster. For many UK businesses, this means either dipping into a business overdraft or exploring invoice finance. Both can bridge the gap between issuing an invoice and getting paid, but their true costs and operational impacts are vastly different. This article cuts through the headline rates to compare the real, all-in cost of a business overdraft against invoice finance options like factoring and discounting, helping you decide which, if any, is right for your business.

The Problem: Understanding the Working Capital Gap

Before diving into solutions, it’s crucial to understand the problem they solve. Most B2B sales in the UK operate on credit terms, typically 30 days. This means you do the work and deliver the goods or services, but you don't get paid for a month or more. Your business, however, has immediate costs: payroll, rent, supplier bills, and VAT.

This creates a working capital gap. It’s the time between you spending money to deliver a service and you receiving money from your client. When clients pay on time, this gap is manageable and predictable. But when payments are late—a common frustration for UK SMEs—that gap widens, and predictable cash flow turns into a stressful guessing game. This is the exact problem that both overdrafts and invoice finance are designed to solve.

What is a Business Overdraft?

A business overdraft is a credit facility attached to your business current account. Your bank gives you permission to have a negative balance up to an agreed limit. If your limit is £10,000, you can continue to make payments from your account until you are £10,000 overdrawn. It’s a flexible line of credit designed for short-term needs.

How an Overdraft is Priced: The Components of Cost

The headline interest rate is only part of the story. The true cost of an overdraft is made up of several components.

Interest: This is the most obvious cost. It's charged daily on the overdrawn balance, not on the total facility limit. Rates are almost always variable, expressed as a margin above the Bank of England Base Rate (e.g., "Base Rate + 8%"). This means your costs will rise if the Bank of England increases its rate.
Arrangement Fee: A one-off fee for setting up the facility in the first place. This can range from a nominal amount to a few hundred pounds, depending on the complexity and size of the facility.
Annual/Renewal Fee: Most business overdrafts come with an annual fee to keep the facility active, regardless of whether you use it. This fee, often 1-2% of the total facility limit, is a charge for having the safety net available. A £20,000 overdraft facility could easily have a £200-£400 annual fee.
Unauthorised Overdraft Fees: If you breach your agreed limit, the costs escalate dramatically. Banks charge high interest rates and fixed penalty fees for unauthorised borrowing, which can quickly spiral.

The Pros and Cons of a Business Overdraft

Pros:

Flexibility: You only borrow what you need, when you need it, and only pay interest on the amount you use.
Simplicity: It’s integrated with your current account, making it easy to manage.
Speed: For existing customers, arranging a small overdraft with your bank can be relatively quick.

Cons:

Security: Banks rarely offer overdrafts on an unsecured basis. They will almost always require a personal guarantee from the directors, meaning your personal assets (like your home) could be at risk if the business fails.
On-Demand Nature: An overdraft is technically repayable "on demand." This means the bank has the right to reduce or cancel your facility with very little notice, which can pull the rug from under your business's feet.
Static Limit: The overdraft limit is fixed. As your business grows and your invoices get larger, the overdraft limit doesn't automatically increase with them. You may find you quickly outgrow it.

What is Invoice Finance?

Invoice finance is a specialist form of funding where a lender advances you cash against the value of your outstanding invoices. Instead of waiting 30, 60, or 90 days for a customer to pay, you can access a large portion of that cash almost immediately. It turns your sales ledger—your list of unpaid B2B invoices—into a source of working capital.

There are two main types: invoice factoring and invoice discounting.

Invoice Factoring: Selling Your Invoices and Outsourcing Collections

With factoring, you effectively sell your invoices to a finance company (the "factor"). The process typically works like this:

You issue an invoice to your customer and send a copy to the factor.
The factor advances you a percentage of the invoice value, typically 75% to 90%, within a day or two.
The factor takes over your credit control and chases the payment from your customer directly.
Once your customer pays the full invoice amount to the factor, the factor pays you the remaining balance (the 10-25%), minus their fees.

Your customers will be aware that you are using a factoring company, as they will be asked to pay into an account controlled by the factor.

Invoice Discounting: Borrowing Against Your Invoices Confidentially

Invoice discounting is a more discreet option, generally reserved for larger or more established businesses with proven credit control processes.

You issue invoices to your customers as normal.
You borrow money from the lender, with the total value of your sales ledger acting as security. The amount you can borrow "rolls" as new invoices are raised and old ones are paid.
You remain in complete control of your credit control and customer relationships. You chase the payments yourself.
Your customers pay into your business bank account as usual. The facility is confidential.

The Real Cost of Invoice Finance: A Detailed Breakdown

Like overdrafts, the headline rate for invoice finance doesn't tell the full story. The pricing structure is more complex and has two main parts.

The Service Fee (or Administration Fee)

This is a charge for managing the facility. It is usually calculated as a percentage of your total invoiced turnover that goes through the facility. For example, if you have a service fee of 1.5% and you put £200,000 of invoices through the facility in a year, your service fee would be £3,000. This fee is charged regardless of how much cash you actually draw down. It covers the lender's administration, risk management, and, in the case of factoring, the cost of running the credit control service.

The Discount Fee (or Interest)

This is the interest you pay on the funds you have actually borrowed. Similar to an overdraft, it's typically calculated daily and expressed as a margin over the Bank of England Base Rate. You only pay this on the cash you've had advanced. For instance, if you have a £100,000 sales ledger, get an 85% advance (£85,000), but only draw down £20,000 to cover costs, you only pay the discount fee on that £20,000.

Other Potential Fees to Watch For

Invoice finance agreements can contain numerous other charges. It is vital to read the small print. These can include:

Arrangement Fees: A one-off fee for setting up the facility.
Audit Fees: The lender may charge you for periodically auditing your sales ledger.
Refactoring Fees: An extra fee charged if an invoice remains unpaid beyond a certain period (e.g., 90 days).
Termination Fees: A significant penalty if you want to end the contract early.
Credit Check & Report Fees: Charges for credit checking your new customers.
Bad Debt Protection (Non-Recourse): This is an optional, insurance-like product. In a standard "recourse" facility, if your customer fails and doesn't pay, you have to repay the advance to the lender. "Non-recourse" factoring protects you from this risk, but it comes at a significantly higher price.

Head-to-Head Comparison: Overdraft vs. Invoice Finance

To make the choice clearer, let's compare the two options side-by-side.

Feature	Business Overdraft	Invoice Finance (Factoring & Discounting)
Basis of Funding	Your bank's assessment of your business's overall health.	The value of your outstanding B2B invoices (your sales ledger).
Funding Limit	A fixed, static limit (e.g., £10,000).	A dynamic limit that grows as your sales and invoice values grow.
Typical Cost Structure	Daily interest on drawn balance + annual facility fee.	Service fee on total turnover + discount fee (interest) on drawn funds.
Security Required	Almost always a personal guarantee and/or a debenture.	A debenture over book debts (your invoices). A personal guarantee may also be required.
Impact on Customers	None. Your financing is private between you and your bank.	Factoring: Visible to customers. Discounting: Confidential.
Credit Control	You retain 100% control and responsibility for chasing debt.	Factoring: The lender takes over. Discounting: You retain control.
Best For	Unpredictable, short-term cash needs. Smaller funding amounts.	Businesses with consistent B2B sales and a growing debtor book.

Beyond Finance: The Third Option – Better Credit Control

While financing tools can be a lifeline, they are ultimately a costly treatment for a symptom. The underlying disease is often weak credit control. Before committing to long-term financing, the most cost-effective first step is to fix the process that causes the cash flow gap in the first place.

Strong credit control isn’t about being aggressive; it’s about being professional and systematic. It involves:

Clear Terms: Ensuring your payment terms are agreed upon upfront.
Accurate Invoicing: Sending clear, correct invoices the moment a job is done.
Proactive Chasing: Having a system for following up on invoices as soon as they become overdue.
Statutory Rights: Knowing your rights under the Late Payment of Commercial Debts (Interest) Act 1998, which allows you to claim interest (currently 8% plus the Bank of England base rate) and fixed compensation of £40-£100 per late invoice.

For many small businesses, this manual process is a major drain on time. This is where automation tools like InvoiceReminder can be invaluable. By setting up automated, scheduled email reminders that escalate from friendly to firm, you can professionalise your credit control without spending hours chasing payments by hand. Reducing your average payment time by just a few days can significantly decrease or even eliminate the need for external finance.

Making the Right Choice for Your Business

There is no single "best" option. The right choice depends entirely on your business model, growth trajectory, and customer base.

An overdraft may be a good fit if you need a simple safety net for occasional, small, and unpredictable cash flow dips. Its flexibility is its key strength, but the risk of personal guarantees and the static limit are significant drawbacks.
Invoice finance is better suited to businesses with a consistent volume of B2B invoices who need a funding solution that scales with their growth. The cost can be higher and more complex, but it directly addresses the problem of a slow-turning sales ledger.

Ultimately, both are tools to manage a problem. The most powerful strategy is to minimise that problem at its source. By implementing a robust and professional credit control system, you reduce your reliance on debt, cut financing costs, and build a more resilient, cash-positive business.

Frequently asked questions

What is the main difference between invoice factoring and discounting?

The key difference is control and confidentiality. With factoring, the finance company takes over your credit control and your customers know you're using a third party. With invoice discounting, you manage your own collections and the facility is confidential, so your customers are unaware.

Can I get a business overdraft without a personal guarantee?

It is very difficult for most small or new businesses. Banks see SMEs as a risk and will almost always require a personal guarantee from the directors to secure the lending. This means your personal assets could be on the line if the business cannot repay the debt.

Is invoice finance expensive?

It can be, but you must compare its cost to the cost of not having the cash. The total expense depends on the combination of the service fee (on total turnover) and the discount fee (on funds drawn). A low headline interest rate can be misleading if the service fee is high. Always calculate the total expected cost over a year.

How does my turnover affect the cost of invoice finance?

Generally, the higher your business's turnover, the lower the percentage service fee you will be offered. Lenders see higher turnover as a sign of a more stable, lower-risk business, and the economies of scale make the administration cheaper for them. This makes invoice finance more cost-effective for larger businesses.

Does using invoice finance damage customer relationships?

Not necessarily. Confidential discounting has no impact at all. With factoring, the professionalism of the finance company is key. A good factor will act as a seamless and polite extension of your business. In some cases, having a professional third party chase payments can be less damaging than a stressed business owner making emotional calls.

What's the first step I should take to improve my cash flow?

Before seeking any external finance, conduct a thorough review of your internal credit control process. Ensure your invoices are accurate, sent promptly, and include clear payment terms. The most immediate and cost-effective improvement is to implement a systematic process for chasing overdue payments.

Automate Your Invoice Chasing

If tightening up your credit control is your first priority, InvoiceReminder can help. It connects to your Xero, QuickBooks, Sage, or FreeAgent account to automatically chase unpaid invoices. You can set up your own schedule of reminders, from gentle nudges to final notices, saving you the manual work of chasing clients. The Free plan currently includes unlimited email reminders at no cost, so you can professionalise your collections process without an upfront investment. InvoiceReminder is built by the team behind WeCovr, which has arranged over 1,000,000 insurance policies in the UK.