Invoice Finance vs Overdraft: Which Is Right for Your UK Business?
Mark Harris
Relationship Manager · Apr 29, 2026 · 8 min read
For UK businesses that need working capital, an invoice finance facility and a bank overdraft serve a similar purpose but work very differently and suit different businesses. This comparison explains the key differences in cost, flexibility, credit impact, and eligibility to help business owners make the right choice.
How each product works
A bank overdraft is a pre-agreed credit facility attached to your business bank account that allows you to spend more than your available balance, up to a set limit. You are charged interest on the negative balance, typically daily. Overdrafts are demand facilities, meaning the bank can reduce or withdraw the limit with relatively short notice. The limit is set based on your business's overall financial health and relationship with the bank.
Invoice finance advances cash against specific unpaid invoices you have already raised. The amount available grows automatically as you raise more invoices and shrinks as customers pay. It is self-liquidating and scales directly with your sales volume. There is no fixed ceiling beyond the available invoice ledger, meaning invoice finance grows with your business in a way an overdraft limit cannot.
Cost comparison
Overdraft interest rates for UK businesses typically range from Bank of England base rate plus 2-4 percent for bank customers with established relationships, to 15 percent or more on demand. However, overdrafts only cost money when they are in use, and the interest compounds daily. For businesses that need occasional short-term cover, the all-in cost of an overdraft may be low if usage is limited.
Invoice finance has two cost components: the service fee (typically 0.5-2.5 percent of annual turnover, charged regardless of usage) and the discount charge (interest on advances drawn, typically base rate plus 2-4 percent per day on the drawn balance). For businesses using the facility consistently and drawing a significant proportion of their ledger, invoice finance can work out cheaper per pound of working capital than an overdraft, particularly when comparing against unsecured overdraft rates from non-relationship lenders.
"An overdraft feels simple but has a ceiling and a demand clause. Invoice finance feels complex but scales without limit and cannot be withdrawn because a bank has changed its appetite."
- Mark Harris, Relationship Manager, Spark Finance
Eligibility: who can access each product
Overdrafts are available from the business's main bank and are granted based on the overall business relationship, credit history, and account conduct. They are relatively easy to maintain once in place but can be difficult to obtain for newer businesses or those that have had credit issues. Most banks require the account to have been open for at least 12 months before considering an overdraft.
Invoice finance is available to any UK business that raises invoices to other businesses on credit terms and has a minimum annual turnover (typically 100,000 pounds or more for most providers). It does not depend on the relationship with a bank, which makes it accessible to businesses that may not qualify for an overdraft. The eligibility focus is on the quality of your debtors, not your bank relationship.
Which to choose and when
Choose an overdraft when: your working capital needs are modest and occasional, you have an established relationship with your bank and can access competitive rates, your business model does not rely heavily on invoices (for example, retail or cash-based businesses), or you need simple, instant access to a small buffer.
Choose invoice finance when: your business has a significant and growing sales ledger, your working capital requirement exceeds what an overdraft can provide, you need the facility to scale automatically with revenue, or your bank is unwilling to extend the overdraft limit you need. Many growing B2B businesses find that invoice finance replaces the overdraft entirely as their primary working capital tool within a few years of setup.
The bottom line
Spark Finance compares invoice finance facilities against existing overdraft arrangements for UK businesses, helping you understand whether switching or supplementing would improve your working capital position. Apply at apply.sparkfinance.co.uk.
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