Business overdraft: how an overdraft facility works for Australian businesses

A business overdraft is a borrowing limit built into your business transaction account. When the balance runs out, the bank keeps honouring payments up to the agreed limit, and the account simply goes into the red until deposits bring it back. business.gov.au puts it neatly: an overdraft lets you take money out of your account even when it’s empty.

For decades the business overdraft was the default way Australian businesses smoothed out cash flow, and it’s still one of the most useful facilities an established business can hold. It is also widely misunderstood — often treated as permanent funding when it was designed to breathe in and out.

How does a business overdraft facility work?

An overdraft facility works automatically: there’s nothing to draw or transfer. Your account is approved for a limit, payments and direct debits continue clearing once the balance passes zero, and every deposit reduces what you owe.

Day to day, it looks like this:

• Balance above zero: the account behaves like any transaction account.
• Balance below zero: you’re borrowing, and interest accrues on the overdrawn amount for each day it stays negative.
• Deposits arrive: they pay the overdraft down first, restoring the available limit.
• Limit reached: further payments may be dishonoured, which lenders and suppliers both notice.

Most banks charge a facility or line fee on the full limit, sometimes quarterly, whether you use it or not. Some also charge an account-keeping fee. That’s why a limit set far above your real needs costs more than it should.

Who offers business overdrafts in Australia?

Overdrafts are mainly a bank product, because the bank needs to hold your transaction account to provide one. Major banks and regional and challenger banks offer them, generally to existing business customers with a trading record and financial statements.

Non-bank and online lenders rarely run transaction accounts, so instead they offer a standalone business line of credit that you draw into your existing account. Functionally it does the same job, with one extra step.

Overdraft vs line of credit: what’s the difference?

The overdraft is attached to the account you trade from; a line of credit sits next to it. Everything else follows from that.

	Business overdraft	Business line of credit
Where the money sits	In your transaction account	Separate facility account
How you use it	Automatically, as payments clear	Transfer a draw when needed
Typical provider	Banks	Online, non-bank and some banks
Usual assessment	Financial statements, BAS, relationship	Bank statements and turnover
Security	Often property or a general security agreement	Often unsecured with a director guarantee
Review	Periodic, with updated financials	Periodic, often based on bank data
Risk of drift	High — it’s invisible until the review	Moderate — each draw is a decision

If you already bank with a lender happy to set an overdraft, it’s usually the most seamless option. If your bank won’t, or wants property you don’t want to offer, a non-bank line is the natural substitute.

What does a bank look at before approving an overdraft?

Banks assess an overdraft much like any other business facility, with extra focus on how the account itself is run. Expect them to look at:

1. Financial statements and tax returns for the last one or two years, plus management accounts if the year is well advanced.
2. BAS lodgement and whether tax is up to date.
3. Account conduct — swings into credit, dishonours, how often existing limits are hit.
4. Security — property, a general security agreement over business assets, or both, plus director guarantees.
5. Debtors and creditors — for larger limits, ageing reports showing who owes you and whom you owe.

Under the 2025 Banking Code of Practice, the “small business” definition was widened so that businesses with total credit of less than $5 million, among other criteria, sit within the Code’s small business protections, according to the Australian Banking Association. That covers the great majority of overdraft customers.

Not sure your financials would get past a bank? Run your situation past a specialist — enquiring doesn’t involve a credit check.

How big should your overdraft limit be?

Size the limit to the deepest dip you can reasonably expect, with a modest buffer. A practical way to work it out:

1. Take the last twelve months of daily or weekly balances.
2. Find the lowest point in each month and note the worst three.
3. Add the cash you’d need for any known one-off in the coming year, such as a large BAS or a bulk stock order.
4. Add a margin — perhaps 10 to 20 per cent — for surprises.

A limit far above that number mostly buys you fees. A limit below it leads to dishonours at the worst possible moment.

Illustrative example: a wholesale bakery’s payment cycle

Purely illustrative, no real business: a wholesale bakery supplies cafés that pay on 30-day terms, while flour, packaging and wages go out weekly. Its balance typically drops to around minus $35,000 in the third week of each month before café payments land and it swings back into credit.

The bank sets a $50,000 overdraft. On most days of the month the account is in credit and no interest is charged; for about ten days each month it’s overdrawn by an average of $20,000. The bakery pays interest only on those overdrawn days, plus the facility fee on $50,000. A $50,000 term loan held all year to cover the same gap would cost noticeably more in total, because interest would run on the full balance every day.

When does an overdraft become a problem?

An overdraft becomes a problem when it stops swinging back into credit. If the balance has sat close to the limit for months, the business is using short-term credit to fund something long-term — a loss, an asset, or stock that isn’t turning over. Banks notice this at review time and may reduce the limit just when you need it most.

The fix is usually to separate the two needs. Convert the permanently drawn portion into a business term loan or a longer working capital loan with a set repayment, and keep the overdraft for genuine short-term movement. If slow-paying customers are the root cause, invoice finance attacks the problem directly.

Can you get a business overdraft without property?

Sometimes, but the options narrow. Banks will occasionally set a modest unsecured overdraft for a long-standing customer with strong, profitable financials, backed by director guarantees and often a general security agreement over business assets. Beyond that, most banks want property behind the limit.

If you don’t own property, or would rather not offer it, the realistic alternatives are:

• an unsecured line of credit from a non-bank or online lender, sized on turnover and bank statements — through our network typically $5,000 to $500,000 for trading businesses;
• invoice finance, if the gap is caused by customers on payment terms;
• a business credit card for small, short gaps, accepting that it’s an expensive way to carry a balance.

If you do own property, a secured overdraft or a secured business loan with a redraw can give you a larger, cheaper buffer than any unsecured product.

How do you keep an overdraft in good standing?

• Lodge financial statements and BAS on time, and send them to the bank before it asks.
• Let the account swing into credit regularly; a facility that never does looks like hard-core debt.
• Avoid dishonours, which damage the account history lenders read.
• Tell the bank early if a large customer pays late or a seasonal slump runs long.
• Review the limit annually against your actual low points.

For more on how this fits the rest of your borrowing, the business loans hub sets out every facility type, and cash flow loans covers lenders that assess you mainly on bank data.

Would an overdraft or line of credit suit your business?

If your cash goes negative for a predictable few days or weeks and then recovers, an account-linked limit could take the stress out of every payment run. Find out if you’re eligible with a quick enquiry and a specialist will tell you whether a bank overdraft or a non-bank line is the better fit. We don’t run a credit check when you ask, we don’t pass your file around a list of lenders, and someone real reads it. Please answer the turnover and banking questions accurately — that’s how we point you to the right lender first go.