Invoice Finance vs Line of Credit vs Overdraft: Which Covers a Cash Gap?

All three cover the same basic problem - a gap between money going out and money coming in - but they draw on different things: invoice finance borrows against unpaid invoices, a line of credit is a set limit against your business's overall credit profile, and an overdraft is the same idea attached to your everyday bank account. The right one depends on why the gap exists and how long it usually lasts.

Invoice finance: borrowing against what you are already owed

Invoice finance (also called factoring or debtor finance) lets you draw funds against the value of your outstanding invoices, rather than waiting the full 30, 60 or 90 days for a customer to pay. Because the funding is tied directly to real, invoiced sales, the amount available grows as your revenue grows - which makes it well suited to businesses whose main cash flow gap comes from slow-paying customers rather than a broader shortfall.

• Funding scales automatically with your invoiced sales
• Security is the invoice itself, not necessarily other business assets
• Can free up cash the same week an invoice is raised

• Only covers the gap created by unpaid invoices, not general cash flow needs
• Usually requires invoicing other businesses (B2B), not consumers directly
• Cost is tied to the specific invoices financed, not a flat facility fee

Line of credit: a flexible limit you draw on as needed

A line of credit is a facility with an approved limit that you can draw down, repay, and redraw again as needed, paying interest only on the amount actually drawn. Unlike invoice finance, it is not tied to any specific invoice or transaction - approval is based on your business's overall credit profile, trading history and cash flow. That makes it a better fit for a broader or less predictable cash flow gap, not just slow-paying customers.

• Not tied to any specific customer or invoice
• Reusable - draw and repay repeatedly within the approved limit
• Can cover any short-term gap, not just unpaid invoices

• Approval depends on overall business credit strength, which takes time to assess
• Limit is fixed until you reapply, unlike invoice finance which scales with sales
• May require security or a personal guarantee depending on the amount

Overdraft: the same idea, through your everyday bank account

A business overdraft lets you draw your everyday transaction account into negative balance, up to an approved limit, and works much like a line of credit in practice. The main difference is where it lives: an overdraft is attached to your existing bank account through your everyday bank, while a line of credit is often a separate, dedicated facility - sometimes through a different lender entirely, arranged with the help of a broker.

• Simple to use - it is just your existing account going into overdraft
• Convenient if your relationship bank already knows your business well

• Limited to what your everyday bank is willing to approve
• Rates and limits are not compared against other lenders
• Can be reviewed or reduced by the bank at fairly short notice

Quick comparison

Which one actually fits your situation?

If your cash flow gap is mainly caused by customers who take 30, 60 or 90 days to pay, invoice finance directly solves that problem and grows with your sales. If the gap is broader - seasonal dips, upfront costs before a job pays out, or general working capital pressure not tied to any one invoice - a line of credit gives you more flexible, reusable cover. An overdraft can work for minor day-to-day timing differences, but it is worth comparing against a dedicated line of credit before assuming your own bank's offer is the best available. For a broader look at managing working capital generally, see our glossary entry on working capital.

The takeaway

None of these three is universally cheaper or better - each is built for a different shape of cash flow gap. The fastest way to know which fits your business is to compare them against your actual sales cycle and customer payment terms, rather than picking the one you have heard of first. A loan-o specialist can walk through your cash flow and match it to the right structure, free and with no obligation.

Finance is subject to lender approval, lending criteria, terms, conditions, fees and charges. The information in this article is general and does not take into account your personal or business needs.

Last reviewed: 1 September 2026. This article was prepared using information available from the Australian Securities and Investments Commission and Moneysmart. This content provides general information only. It should not be treated as personal financial, tax, legal or credit advice.